HomeMy WebLinkAboutDrainage Reports - 04/24/2020 (2)Wes Lamarque
4/24/2020
Professional Engineer Certification
f hereby certi#y that this F�nal Drainage and Erosion Control Report for th� Cherry Street
Cottages Subdi�ision was prepared by me (or under my direct super�isio�) for the
owners thereaf and meet or exceed the requirements af the City of Fart Collins
Starmwater Criteria Manua�.
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\`�������������R���"��5,,���� Paul C. Sorensen, PE
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��p�.��. SOgf�••;�'�y:
�!J Registered Professional Engineer
Z'• ' State of Colorado No. 23679
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Final Dr�in�g� ar�d �rosion C�n�r�l Rep�r�
T��L� t�� C�NI'��T�
�. ������.�. �.oc��r�o� ,�r�o ��sc���rio�........................................................�
' �. Location................................................................................................................�
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3. Floodpl�in Subrv�ittal Reqt�irements.............................................................................8
�. DRAI�lACa� I�,ASINS AND SU�-��4�t�� ...........................................................1x
1. Majc�r�asin D�scriptian......................................................................................�.1
; 2. Sub-�a�in ��scrip��an..................................................................................................�.�
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� � C. DRP►�N�C�E �E�EC� C�6T��1�....................................................................
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: 1. �ptional Prodisior�s.............
................................................................................12
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2. Imp�niiou�Area.................................................................................................
.12
� 3. D�velapm�n�Crit�ria R�ference and Can�train�s............. ...�.�
; �. Hydrolo�ic Cri�eria ..............................................................................................14
a 5. Nydraulic Criteri� ................................................................................................14
6. �Ic�c�dplain �e�ul��ory Cornplia�ce......................................................................15
7. �edi�c�tiorts of Crit�ria .....................................................................................15
�. �RIA�Ni4GE FACiL�TY DE�$�t� ..........................................................................15
1. G�nera� ��nCe�t .................................................................................................�.�
; �. Speci�ic C7���i[s...............................................................................................>....15
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� E. �Qt��LUSI�NS ..................................................................
.................................�Y
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; �.. Cornpli�r�ce wi�h St�nd�rds.................................................................................�7
� 2. Drain�g�Cor�c�pt................................................................................................7.7
�` RE�ER��CES
...........................................................................................................1�
� �p�endix i�: 5t�rmteeh �harraber Sizir��Calcula�ie��s .................................................�.9
� Ap�endix �: Hydrolo�ic Comp�a�a�ti�ns.......................................................................2�
� �PPer�dix C: Hydra€�1ic Computatic�ns.........................................................................2�
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'' ����ndi� D: Fema FIFif� MAP...............................................................,......,............,2�
Ap�endi� �: �ra�ian Ce��tral [�ep�rt...........................................................................2�
�=ir��� �r�ir���� a�tc� �r�°si�s� C�s��r�ai �����r�
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LIST OF FIGURES
Figure1. Vicinity Map...........................................•--.....-----..........................................4
Figure 2. Ci#y Flood Risk Map.......................................................................................5
Figure3. Property Aerial photograph...........................................................................6
Figure 4. West Vine Drainage Flood�lain Map...............................•..............................9
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' F€gure 5. Fort Callins Mas�er Plan Basin Recorrimended Impro�emer�ts ............
....---.. 11
�.IST OF TABL�S
Tabfe 1. SFE, RFPE, FF, and HVAC Ele�ations..............................................................1,Q
; Tabfe Z. Detention Pond Desigrt Summary.................................................................16
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Final Drainage and �rosian Cor�irol Eiepor�
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A. GENERAL LOCATION AND DESCRIPTION
1. Location
a. Vicinity Map
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Figure 1. Vicinity Map
;=;r�ai 'V;�;��a�e ar}d Erosion Contr•cf i'�epert
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b. The Cherry Street Cottages project sit� is located in the Nartheast quarter of 5ection 10,
Township 7 North, Range 69 West of the 6th Principal Meridian, City af Far� Collins, Co�nty
of Larimer, State of Colorado.
c. Cherry Street Cottages is bord�red to the north by an existing residential property; to the
east by singie-famiRy horr�es {Hanna Farm Neighborhoad); to the west by Lyons 5treet anc!
singEe famiiy homes (Mountain View Heights); and to the south by Cherry Street and the
Putnam Schoal.
d. The General Location Map presented below identifies drainage flow entering and leaving
the �roperty, and is based on the City of Fort Collins West Vine Drainage Flood Risk Map. As
shown, and discussed in detail below, a small channel of the West Vine 100-year floodway
a�d floodplain exists along the south and east sides af the developrnent.
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Figure 2. City Flood Risk Map
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e. The Putnam 5chool is present to t�e south across Cherry Street. Open property car�taining
one single-farnify home is located to the north. Histaric residential properties are present to
the east and west, across Lyons Street.
2. Rroperty Descriptian
a. Area in Acr�s:
�he Cherry Street Cottages property is comprFsed of approximate�y 1.01 acres.
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b. Ground Co�er:
As shawn in the site aerial photograph (�igure 3y, there are no existing irrzpro�ements on
the property, and the existing �ege�ation consists of nati�e grasses. The existing on-site
excess runoff drains to the sauth/southeast i�to the Cherry Street gutter, which flows to the
east and then to the north along Franklin Street to the West Vine Dri�e Drainage, #hence to
the Poudre River. No "prominent features" including streams, canals, pond5, wetlands, or
major utilities are present on the property.
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Figure 3. Property Aerial Photograph
�:i,���; i�rairia��c� �,��c; �rasian Control f���c��
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c. Major Drainageways:
Aside from the aforementianed West Vine Basin drainage that exists along Cherry Street on
#he sauth side ofthe project, no other rnajor drainageways exist in this �icinity.
d. GeneraE Project C�escriptior�:
The proposed Cherry Street Cottages will include six (6j dwelfing units. An access
dri�eway/alley, dedicated as Tract B, will be located along the north side of the praperty,
with rear garages for each lot. Tract A wil[ be dedicated for a stormwater deter�tior� pond,
as shown in the Drainage Pfan.
7he propflsed landscaping will include a retaining wall located coincident w9th the existing
mapped floodway along the south sides of the properCy, curving to the north within 7ract A,
the eastErrt-most track. 7'ract A is dedica�ed for the stormwat�r detentian pond to be
sit�ated outside of thce floodway, but within the identified fioodplain. Additionally, a short
a retaining wall with a 6-inch curb will b� placed alang the north side of Tract B —the access
dri�eway on the nor`rh side of the project.
A Landscap� Pfan has been preparecf in accordance with th� PDP submittal requirements,
' and is �ubmitted as a separate document from this 17rainage Plan. Briefly, the Landscape
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£ Plan calls for an assortr�ent of flaw�ring plan�s and shrub beds anc! tr�es. As required by
� the Far•t Collins Lar�d Use Code, law-water-use plants and grasses are used as much as
possible. Additianalfy 36 trees (6 per 1ot) and a 6-foot pri�aey fenee wifl be placed aEar�g
tf�e north proper�y line in accardance with City requirements
Ali pro�osec� buifding footprints (building envelopes� and sidewalks are pro�ided on the
Cherry Street Cottages Site Plan, submitt�d as a separate part of this PDP app[ication.
� Additionafly, th� Landscape Plan clearly shaws all builcfing pad sit�s, as well as the retaining
g wall, berms, planters, shrub beds,trees, etc.
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' The 100-year floodplain and floodway boundaries as well as th� base flood elevations
E across the property are clearly depicted an the a�tached Drainage Pfan. The an-site
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� detention pond and retaining wafl are also shown on the Drainage Plan.
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; Soi�s encountered on fhe property generally consist Qf the Nunn—Fort Coilins—Ulm
� association: deep, nearly [e�ef, w�ll drained elay [oams ancf foams that formed in alluvium.
� More site-specific mapping indicates a Table Mountain Loam at 0 to 1% slo�e. A
representative profi[e would COE1515� of a surface layer of grayish brown loam about 36
inches thick, with underEying material of brown fine sandy loam about 1D inches �hick and
yeilowish brown, fin� sandy foam about 5 inches thick. Below that is sand and gra�el (Soi[
Survey of Larimer County Area Colorado, US Soil Conserriation Ser�ice and Farest Service,
198�). •
e. ]rrigation facilities:
There are no irrigation ditches, faterai5, or structures located on the prop�rty.
Final Drainage and Erosinn Corstrol Repor�
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f. Prpposed Land Use:
The proposed Cherry Street Cotfiages project wil) consist of six buildable lots, plus Tract A
�eastern-most [o� dedicated for the detention pond), and Tract B (nartherr� portion ofi the
site dedicated far the access dri�eway and drair�age). Lots 1. through 6 (from west to east)
will be accessed frorri a rear al[ey/dri�eway�ia Tract B. Each lot will consist of primary living
units an the front half with garages built in the back half. Two basic building envelopes are
proposed: one with attached garages, and one with detached garages, all accessed from the
rear driveway/a[ley.
Other impro�ements that are ineluded with the Cherry Street Cottages project will be
lancfscaping, as presented in th� Landscape Plan, artd a short retaining wall running the
length of the �roject from Lyons 5treet to the detentEon pond in Tract A. The retaining wa(I
wilf ser�e to ele�a�te the iats as needed to place the hottom flaor at approximately 1S inches
above the Base Fiood Elevation, discuss�d below.
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The praposed Cherry Street Cottages project is located in Low Density Mixed-Use
Neighborhood (LMN) zor�ing, which aliaws 4-9 dwelling units per acre.
3. Fioodplain Submitta� Requiremer�ts
7h� City of �or� Callins Floodp[ain Re�iew Cheeklist-----50% De�elopment Re�iew Ch�cklist was
reviewed, and each listed item was completed and previously submitted or marked as "Not
Applicable (N/A)."
As shown on Figure 4, Cherry 5tre�t Cattages F[aadplain Map, based on the City �load Risk
� Map, the south�rn portio� of the suf�ject �raperty is locat�d in ar adjacent to the City
regulatory Wesf Vine Basin 100-year floodplain, anc[ the southeast corner of Tract A �detention
pond area) is located in the 100-year Floodway and Nigh Risk Flood Fring� of the West Vine
Drainage Basin. Accordingly, na impro�emer�ts are prap�sed for the area wi�hin the 10Q-year
� Floodway, and fhe aforementioned retaining wall as proposed is caincident with th� floodway
� boundary. FEMA FIRM Pane6 0978G, Panel 978 of 1.420, shows that th� subj�ct property is not
� within a FEMA-d�signated flood�lain (See Appendix D).
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Fina[ Drair�age ar�d Erosion Con�rof Repor�
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Fig�re 4. West Vine Drainage Floodplain Map
,.���; A.-3�air�age ar��:� `�:�;�,:c.,;.., �_��f�r�l f����rt
9
Homes and garages built on lots that are �artially ar totally within the City-designated
floodplain will have spread footing foundations with slab-an-grade concrete floors. The lawest
floor le�el wi[I be at leas� 18-inches afao�e the base flood ele�ation. As discussed below, this
project will comply with safety regulations of Chapter 10 of City Cocfe.
a. No new residential structures wiil be built in the floodway.
b. lVnn�struc�ural develapment (fill, sidewalks, retaining wall, and �egetatian) will be
completed within the floodway, and such improvemen�s will rtot cause a rise tv the Base
F�ood EEe�ation {BFE) or a change to the bnundaries of the floodway or flood fringe.
c. Proposed residential struc�ures within the flood fringe wifl be cnmpieted with the low�st
finished fioor (ineluding duct work, heating, �entifation and air-conditioning systems, etG.)
e[evated at least �.8 inches above the BFE—also referred to as the Regulatory Fload
Protection Ele�ation (RFPE}. All hauses located within the flood fringe wiil ha�e spre�ad
i faoting faundatians with slab on grade concrete floors. 7able 1 pra�ides base �[ood
elevation, regulatory flooc4 �rotectior� efevation, finished ffoor ele�ations, and HVAC
elevations for all structures located wifhin the floodplain.
Table �.. BFE, RFPE, FF, and NVAC Ele�ations for All Structures Lacated within the Flooc{plain.
Lat Number Structure BFE RFP� FF HVAC
1 Home 5024.9 5026.4 5028.4 5028.4
� 2 Home 5024.7 5026.2 5�28.3 5028.3
3 Home 50Z4.5 5026.0 5028.�. 5028.1
4 Home 5024.3 5025.$ 5fl27.8 5027.8
5 Home 5024.Z Sfl25.7 5027.5 5027.5
6 Home 5023.3 5fl24.8 5027.2 5027.2
Garage 5023.8 5025.3 5027.2 n/a
d. Ther� ar� no critical facilities pro�osed within th� 100-y�ar floodplain.
i e. A Floodpiain tJse Permit wi[I be applied for prior to construction ot any str�ctur�s within the
� flood fring�, aiong with the appropriate perrrtit application fee. The Applicant understands
that a FEMA Ele�ation Certificate is required prior to issuance of the Cer[ificate of
�
Occupaney (COy for any structures built in the �.00-year�Ioodplain.
E
Ef. As required by City regulatory requirernents, No-Rise Certifications will be obtained for alf
€ non-structural de�elopmer�t in the floodway before any de�elopment work in the floodway
€
�sidewalks, retaining wall, detention pond berm} is initiated.
i
SEC reviewed the Fort Collins Master Plan Basin Recomm�nd�d fmpro�em�nts rnap,
r�procfuced h�rein as Figure 5. With the implementation of recammended basin
i impro�ements, this exhibit indicates that the future floodplain may be eliminated from the
` Cherry Street location adjacent to the subject property.
Fina! Draina�e and �rosian Cor�trol Re�or�
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�igure 5. Fort Collins Master Plan Basin Recommended Irrtprp�ements
B. DRAINAGE BASINS AND SUB-BASINS
1. Major Basin Description
a. The Cherry Street Cattages project is iocated within th� WeSt Vine Basin, loGated in
nort�west �ort Collins with a drainage area of approximateiy 2,35� acres. Accordir�gly, this
drainage plan canforms to the West Vine Basin Master Drainage Plan (current�y being
updated) as welf as the �ort Collins Stormwater Criteria Manual (FCSCM).
b. The City estimates that approxirrzately 85% of the basin is in unincorporated Larimer
Caunty, and generaily drains from west to east along five flow paths. Frequent drainage
problem5 ha�e arisen on occasion because of sporadic de�elopment that occurred withir�
the basin with tarresponding a�eral! inadequate drainage facilities. Major storm e�ents
over the last a�proxirnately 20 yEars have created flooding p�ablems in the vicinity of Irish
Drive and Overlar�d Trail, but not, to �he Applitant's knowledge, specificalEy in the Cherry-
Lyans Streets area. Moreo�er, the City af Fort Coliins Master Plan Basin Recommended
Emprovements, as shown by the Flooding Solution Map ir� t�e West Vine Basin Master Plan,
indicates that th� curr�nt designated floodplain and floodway may be eliminated in the
Cherry-Lyons 5treets area with future drainage improvements.
3 ..
�=;F�,�.;r Drair�:a„c� a;�.:�' L;c�:.;i;.li�� `+:��,��u� ��epar�
�1
c. Future impro�err�ents to upstream irrigation facilities within the basin may result in a
posi�ive ir�fluence an the Cherry Streef Cottages project and the imrnediate area of Cherry
and Lyor�s Streets. There are no other irrigation facilities within the basin that will influence
or �e influenced by the Cherry Street Cottages project, and excess de�elo�ed runofF from
the subject property wil� be releasec4 in a controli�d manner, minimizing the impact of this
project on tl�e o�erall drainage patterns within the West Vine Basin.
Z. Sub-Basin Description
a. �'he Ch�rry Streefi Cottages �rojecf wil[ accupy approximateiy 1 acre wi�hin the 2,350-acre
West Vine Drainage Basin. Afthough this is a minuscule ppr-fion of the o�erall basin, the
proposed project incorporates on-sifie d�tentian for both water quafity and discharge
quantity benefi�s. 5pecific Best Management Practices (BMPs) and Law Impact
De�elopment (LID) requirements are met with this proj�ct, as discussed in t[etail below.
b. The southern flow path within the West Vine Basin contribut�s�low to Cherry Street on the
south side of the propased proj�ct, as depicted in Figure 2. As shown in Figure 5, "City of
Fort Collins Master Plan Sasin Etecammended Ir�provements," future basin impravements
ap}�ear to efFectively remo�e the suf�ject praperty from designated "probfem" areas with
respect ta basin flooding.
c. The praject site receives very little runoff from off-sit� prfl�erties, with the prirrEary source
of ofF-site runoff coming fror� the property ta the north. A slight drainage divide exists just
north of the property, directing runoff fram that area to th� east. This off-site drainage will
} enter the sttbject �roperty via sheet flaw along the north sicfe of the property. A short
retaining wail will be built along th� north side of the access driveway, feaving a strip of
approxitnately 4-feet wide that will be �egetated (36 trees), and shaped into a srnall
infiltration-runoff swale �LID method} to con�ey excess runoff to the east. The rock swale
afong the rtorth side will re�ert to a concr�te swale at the northwest corr�er of the det�ntion
pond and con�ey excess runoff water from the narth around the detention �a�d,
� discharging back to its histarical point af discharge on Cherry Street.
C. DRAINAGE D�SIGIV CRITERIA
E
� 1. Optional Prodisions
i
€ There are no optional �ro�isions or de�iations from the FCSCM propased wi�h the Cherry
� 5tr�et Cottages project.
f
�
2. ImperVious Area
The scope of the praposed praject does increase the im�er�ious area of the prap�rty
through the addition of six �6) residential ciwelfing units and the associated rear-entry
garages and dri�eway/access street. To the extertt possibl�, C3irectly Connected fmpervious
Area (�]CIA) wi[I be minirnized. For t�is 1-� acre parcel with a future mix of roaf-tops (90%
FinaE Draina�� and Erosion Can€ro[ Re�art
12
imp�rvio�s), parrement (100°l), gravel (40%), �nd o�en space/landscapin� (�f), fihe
weight�d perc�nt imp�rwiflus far this developed site is 4�2°�.
The overall stormrrvater rriarta�emen�t strategy fnr this proj�ct wiE[ utilixe the "Four-Step
Process"ta minimize adders� impacts on receiving water q�ality, as f�llows:
a. Step 1---�'mploy Runaff Rectuction Praci�ices. B�caus� o� the proxirnity of th� project
property�o the Vilest Vine Drainage d�sig�afi�d 200-year f�oodplain, �he ov�rall gradin� pl�n
includ�s th� imporfiin� of �II material to elevate the ground fiioc�r efevatio� of the hom�s
within the desi�r�ated floodplair� to at least 18 inches abaue the BFE. This �radin� plan
results in fot �radin� to erea�� a sli�ht sou�h�est-to-northeasfi drainage pattern, directin�
on-site runc�fF across �rassy ar�a to fihe dri�+eway/al[ey access street on the ncrth side o�th�
�roperty, thertce to t�e east and t�e d�fier�tior� por�d. 1"Ftis changes th� histnric draina�e
pa�tern from nar�h fio so�ath, dischargirr� �o Cherry Street. Stc�rmvvater r�ar�off w�iil pass
throU�h the defention pond with a control[ed r�leas� back ta Cherry Street, �hereby
� redueing and slowing off site runo�F.
� The Cherry Street Cotta�es project will ir°npl�rnent Low Impact Dev�(apmen� ��ID) strate�ies
ta reduce runoff p�aks, Wo(umes, �nd p�llu�ant iaading �rorti-� frequen�ly accurrin�
precipi�ation events, i.e. 2-year storm ev�nts. �'o �he �x�ent practical, runoff wiil be ro�ted
acrass ve�etated are�s (by sheet fiow, if possi�le) �o surf'ace-based �MPs s�ach as grass swales
ar�d grass buf�ers. To fulfill th� requirement �hat one-half of th� n�w impenrious area be
� tr�at�d with �ID strate�ies, a stormwater inlet wil( b� lQca�ed in the center of the ir��ert�d
�
crawn-dri�er�vay a� the east �nd o� lot 3. `Chis inlet vviii dischar�e runoff to a Storm�ech
Under�round Chamber Syst�m�as manufactured by A�vanc�d Dr�inage Systems, Inc. (AD5)
and s�auld efifectively treat initia{ runo�'f flows from the west half of the project. The
� Storrn�ech chamher sizi€��calc�alations are provided her�in in Appendix A. Exc�ss stormwater
runaff, i.e from a pr�cipitatian ever�t that exceeds the 2-y�ar even� runoff, will �law �ver th�
inl�t and dischar�e dircctly to�h�d�tentian �qnd. Additipr�a![y, exce5s rurtaf�tha�is captured
in �h� eharr�bers wil( be discharged via a �ipe in t�te end a� th� chambers �o the de�er��inn
�nnd inlet, Irnplementin�these Lf€�strategies should serv�t�somevv�at miti�ate the impacts
afithe ir�cr�as�d imp�rWious areas.
E b. S��p ,�—lmplemen�BMPs Tha�' Provide a Water C2ualit7r Capture 1/olume (Ih�CQVJ wr��t Slauf
�
; Release. �or this prflject, effarts preset��ed in �tep 1 shau[d effectiv�ly minir�ize e�cess
; rurtoff fro►-n �requently occrarrin� storrr� e�ents. After minimiaing runoff, �he r�maining
� r�r�o� wilE E�e treated �hraugh cap�ure and sfowe release of th� WQGV fram t�e art-site
�
€ detenfiian pond. The out[et wc�rks fvr this proj�ct is designed ta allow an historic r�leas�
` rate of 0.35 cubic fee� per secand (cfs).
[
(
; c. Si�ep 3 Stabifi,ze tJrainageways. As stated abo�e, aside firom �he West lJine B�sir� Drairt��e,
no crther major draina�eways are �rr�s�r�� or� or adjacer�t to the �roper�y. T'his proj�ct wiil
ir�direet[y h�lp to 5�abi(ize �he lfVeS� Vine Drainage t�rora�h �imed release of large
precipitation events, serving to reduce p�a� ffows in the immedia�e Vicini�y. (�oreo��r, the
F����[ C���ir���� �r�cf Crr�ic�r� Cca�€�r�l ���:a�r��
:��
�araject wif� pay not anEy anetime stormwater deyelflprnent fees, but alsa ongoing rr�onthly
stormwater utitity fees, serving to �e�p ac�ieve City-wide drainage-way stabilfty_
d. Step 4—!mplement Site-Specific and Dther So�rrce Contro! &MPs. �his step ty}�icafly appiies
to ir�dust�-ial and cammercial deve�opments_
3. Deve��opment Criteria �ieference ar�d Constraints
a. There ha�e been no previous drainage s#udie5 far this site.
b. There are no kr�own drainage studies for any adjacent properties 'that will ha�e any effect
on the Ci�erry Street Cottages project.
c. Site constraints exist or� tk�e so�th and we5t sides by existing st�e�ts, and on t#�e north k�y a
minor cfrai�age divide and the proposed access s#reet/alley. The site is �onsirained on the
east by a f�l�y deveioped residential neighborhood. No other sit� constraints current�y exist
on the subjec� praperty.
4. Hydrologic Criteria
a. The City of �ort Collins Rainfiaif in#ensity-Duration-Erequency Cur�es for the 2-year and ZOQ-
year design preGipitation events, as provided in Figure RA-16 af the FCStM, serve as the
data saurce far all f�ydrologic computa�ions associated with the CF�erry Street Cottages
praject. Data pravided in �able RA-7 are used for Rational Method runaff calculatio�ns.
b. The f�ational Method is used to cornpt��e stormwater runoff with coefficients provided in
�'abfes RO-11 and fi0-12 of tF�e FCSCM.
c. �Fhe Rationai Farrr3ula-Based ❑etentian Volume i�y the Madified FAA Method is used for
detention storage calcuiations.
d. Design s#orm recurrence interval5 of 2-years (Minor S�orm) and 10Q-years {Major 5'�arm}
are used for these analyses.
5. Hydraulic Criteria
a. The propvsed Cherry Street Cattages drainage plan is designed in aecorcfance wit� criteria
autlined in the FCSCM and/or the Urban Drainage and Flood Control District (tJDFCD) Urban
Storm Drainage Criteria Manual.
� b. Na other drainage faci�ity design criteria are use #or this rfesign.
c. As previously stated, there are na naturaf drair�ageways within the subject pro{�erty
1`herefore, na modifications ta r�atural drainageways are prop[�sed, and no "Flaadplain
Madeling Study" woutd be requireti based an tf�is cc+teri�n alor�e.
6. �loodplain Regula#ory Compliance
a. A5 stated a�ove, the City of Fvrt CoEiins Floadp�ain Re�iew Che�kl�st for 50% 5�bmitta�s was
pre�iously 5ubmitYecf. Accordingly, it is tFa� intent of #he Applieant i� comply with ai!
applicable Cfty of Fort Collins fioodp�ain regulations.
7. Mo�ifications of Criteria
a. Na modificat�ons are re��ested at tE�is time.
D. DRAINAGE FACILlTY DESIGN
�. General �oncept
a. Drainage pattern5 at� the sub�ect praperty have I�istoricaNy cans}sted flf runnff frnm the
single-#amily resic#ential property to the north. �his runoff drainage has typicaily flowed to
the south-southeast, and that basic drainage pattern wil! r�ot be affected by this project.
�he prirnary objecti�e of the Cf�erry Street Cottages drainage design is to rnaintain existing
drainage patterns to the extent pa5sihl�, whi�e not adversely irrfpacting acijatent prQperties.
b. As previously disc�5sed, the primary off-site runoff occurs ta the east into a cfeve�oped
residentiaE property and south ta Cherry Street. With the completion of the proposed
project, the A�piicant 6eiie�es that aff-site runoff may be somewhat reduced to the
residential neigE�barhoad to the east through the instaEtatior� af fln-site deten#ion in Tract A
at tt�e east end of the proposed pra�ect. Runoff Lhat previous�y made its way directty tn the
re�identiai properties to the east wil� now be detained and slowly released to the Cherry
5treet curb and gutter, potentia!!y s�rving to somewhat mitigate flooriing of tt�e properties
to the east.
c. A list of �'abkes anc� �ig�res used in this report is provided in the �Fable of Contents at the
frant af this document. �ach table or �gure tnerein listed is focated within the appliCa�le
section of#his report.
d_ Exis�ing drainage patterns cansist of primarily sheet ffaw ta Cherry Street on the south. �Fhe
proposed drainage patterns direct o►�-site runoff back to the r�ort� sit�e o€t?�e �roperty and
thence to t�e east and t�te detention pand. Off-site runoff from the north wifi fiaw to a
drai�age swaEe that wiil convey #low araund the detention por�d Iflcat�d at the east end of
the de�elopment and discharge back#a its historic location on Cherry Street.
2. Specific Details
a. No speCific design �rablems were encountered during design, aside from emp6oying an
itefative process ta design and situa#e the detentivn pond in bes# accordance with both
hydrologic/hydraulic factors and the awner's preferred por�d locaticrn and cor�fguration. Na
v#her speci#ic or special design problems were enc�untered.
b. The Modified FAA Method was u5�ed ta size the DetenEion Pond. Out�et design is in
accordance vvith UDCM design parar�reters, ar�d appl�cab�e equa#ior�s are referer�ced �r� t�e
desig�, as showr� in Appen�ices B& C, Hydrologic and Hydraulic Comp�tatio�S, respet#ively.
The por�c� va4urr3e was cafculated to be 0_095 acre-feet (4,158 cubic f�et) far t�e �EH}-year
required detenti�n thaYs based on the 100-year rain#ali Criterion fc�r the City of Fart Collins.
�'�e a�ailat�le Water Quality Capture Vo�urne (WQCVj is O.i112 AF. Ff�e �orrespanding 10Q-
year water surface e#evaiion (WSEL) i5 5025.9. The WQCD storag� volurne of O.Q17 AF WSE�
is 5024.9, yielding a WQCV total rr�aximum �onding depth (at the outlet)of 1.0 ft.
An ocifite plate autlet is Qrov�cied fof con�rolled release from the dete�Csan pon�. Three
(3�row5 of ori�ce5, each with a 3{2-inch-diameter hole rn►ill restri� disEharge ta a
cumulativ�rate af 0.0�. cfs at a ponc�surface eie�ativr� of 5,02Q.9, and prar�fde for a 25 hae�r
pond drain time.
G. Table 2 presents a summary o#detention pond desigr�.
�"able 2. Detentian Portd Design Su€nmary
___,._---
------_._---.__ �
It�Ctl Qt�81'1�f�1 __..___.__._-._.�
,.._...-- ......_ . .----.._ ______._�._.._�_
_._._._ _..._.._.._....----.._.-.__._.._..._._.__..__
Stage-5torage Cur�e See Appendix B
Stage-�ischarge Gurve 5ee Appendix B
Detentior� Pond Required Vole�€ne O.U95 a-#
Detention �or�ti �esig� Valurne a.�12 a-€
Water Qual�ty Capture Valume 0.042 a-f
Water Qualify Efevatian � 5,OZ4.9-ft
5pillway Elev�tion 5,026.�-ft
Pond Freeboard 1-ft
Outlet Size: � �
Orifi�e Pfate 3 rows with 1 h-in hole �er �
Overfiow Weir � row 12-in �
,
1.OQ-year Qutlet Restrictor Plate ; 1.5$-ir� abov�ae�#let pipe in�ert
d. Maintenance access is open with no access limitations #� t#�e dete�tion por�d a�d
assc�cia#ed outlet wor�Cs.
e. There is an existing 9-foot utility ea5emerit along fhe south and west sides and a 6-�oot
utility and drainage easement along the north and east sides oi the property. Trat# A, the
' ea5t�rr�-mo5t lot, wil� be dedi�ated €or the detentio� pond a�d r�late€� drainage features.
No stru�ures will be plaeed wEthin the cfraEnage easerrient, intfuding playgrou�d
�quiprnen#, but the area wi�! be availabfe for neighborhaod �ctiw9ties during d�y weathe�'
�he detention pond, atcess drive/atley, and the area south of the proposed dete�atian wall
will be dec�+cated for drair�age and utility easeme�ts, ar�d wil� be owned and maintained by
the future horrieowr�ers assaciatian.
f. No off-site faei[i�ies ar� proposed far cartveyance o� minor and major �ows �o �he rnajor
draina�eway.
E. CC��CLl�DS1�NS
1. �Qmpliar�ee�i�h �t�nd�rds
a. This dr�in�ge plan is in cornpliance wi�1� Ci�y of Fort Co[lins Storm+�vater Cri�eria Manual.
�. This draina�e plar� is in compliance with the City of For� Collins Niaster Drainag� P[an �nd
�rhe Viles�Vir�� Dr�ina�e Plart.
e. This drain�ge pian is ir� eomplianc�with the City pf Fort Coliins �loadplair� rcgu[a�iorts.
d. A �loodplain Us� Permit appl�ca�ion will be prepared ir� accordance with r�quircmen�s
�ro�ided in �ort Collirts City Code, Section 10-27, �IflQCI�I�I►1 U5@ P@I"i'Clf�.
e. T�iiS C�E'�fil"c3�@ �I��1 IS EC] CQ[i1�lIf�I7C2 W[tfl CI1��$�I' 10 O'�CI�� CAC�E, as uvelf as applicaF�fe State
af C�f�rado and Federa[ re�ulatians governi��stormwaCer disehar��.
�. Dr�ina�e�oneept
a. T�� draina�e desi�n p�aposed �ar thi� praject will effectively contro! dama�e associa�ed
� with �torrr�water r�noff. Runr��ff from exis�ing �er�ious ar�as th�� will be con�ert�d to
� irnper�ious ar�as v�il[ be cnntrolled to re[ease at the 2-year historic rate during the 3.q(3-year
�
j event.
� h. The propvsed deuelopment will have no impaet on either th� City or We$t Vine 13asin
M��ter prainage Plans.
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REF�RE�CES
City of Fort Collins Stormwater Criferia Manual, Ci'ty of Fort Collins, Colorado, as adopted by
Ordinance No. 174, 2011.
Soil Survey of Larimer County Area, Colorado, Uni#ed States D�partment af Agriculture Soif
ConserVation Ser�ice, 1984,
Urban Storm Drainage Criteria Manual, Valumes 1—�, Urf�an Drainage and Fload Control
Districfi, Wright-McLaughlin Engineers, Den�er, Coloracta, re�ised A�ril 2008.
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Fina1 Drainage and �rosion Confro! Repprt
�8
APP�ND�X A: ST�RR�TE�H CkiANl�ER SIZ[NG C�4LCUL�TiCJ1�S
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1. L�nd u��a�sumptio�s re��rdin�adj�cent praperti�s
The Applicant assumes th�t existing land uses on �djacer�t properties to the saut� (Put�am
Elernentary Schoo[) and east and west (esta�lished residen�ki�! �roperti�s) vvill remain
unchanged §rom present uses. The [and fic� �he nor�h currently cor�tains one sin�Ee-family
home, and may be subj�ct to fu�ure residen�iaf deveiopme�t. In tha� e�entuaiity, tf�e
Applican� understands th�f no a5soeia�ed impact to th�subject property�hould be realized,
and in fact, runoff fram that area to�he north m�y be miti�at�d to same extent.
�. fnitial (2-year) and m�jor (�.Q�-y�ar) storrr� runo'� caEculatic�ns are a�ached, including the
�istoric ar�d dev�Eaped rur�o�computations usin�the UD�CD Rat[ar��l Me�had.
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APP�I�IDIX C: HXQRP►tlLIC C��PUY�I'ICI�S
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1. Cuf�e�Capacities: N/A, No culverts are peopos�d.
2. Storrn 5e�rer Capacity: i�/A. �!n new starm sewers are prr�posed.
3. Str��t �low calcula�ions: fV/A. Because the detention pand outle� is designed to contral
reieas�, r�o new starmvvater runoff �low in exces5 of historic/existin� �[a+rvs will be
�en�rated by this �rvject.
�. Storm in[et ca�acity: �1/A. Na r�ew storm infets are designed for this project.
5. Open Channe! Desi�n: A concr�t� drair�a�� swa[e will be placed alang the north an� east
51C��5 of the d�t�ntion por�d for the �urpose af conveyin� starmwater rur�afF from the
prop�rty �o the narth around the detention pond, discharging back ta its historie lacation
an Cf�erry Street.
i
6. Ghec�dam and/or c�annel drop design: N/A.
� 7. Detention fiacili�y d�sigr�. The det��tian pond volum� was calcu[ated by the �D�CD
�
� Madifiec! FAA Met�od. Mode! prir�tvuts ar� at�ached, ir�ciudin� the 2-year and 3�00-y�ar
� detention valumes, and stag�-discharg� �rapF�s for bo�}� the detentian basin and the WQCD
� outict.
�. Downstrearn/oUtfall system capacity ta the m�jor draina�eway system. 7he deten�iort �ond
autfall wilf be ta a cancrete drain par� with roc� to protect the pan ed�es d�ring the 100-
� year e���� dischar�e. The drain p�n will tr�nsport outfail discharg€� via a �idewalk chase to
the existin� Cherry Street curb and gutter.
� 9. Erosion prc�tec�ion measures�or culver�s, and storm sewer outlets: N/A.
�
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1=i�i�� C3rair���� �r;t� ����ir;� ��,���r�al ���t��i
,-,
w�
100 Year
This is to converf%imp.fo a C value
14fl-year (must insert%imp.and C pervious). Required detention
-
ft3 I acre-it.
'C'vafue 0.72 4157.7 0.495
Area 0.7 acres � Modifsed Modified
Release F�ate 0.35 M. FATER D.JUD15 C.LI
� 5/95 Nqv-97 Nov-98
DETENTiON POND 51ZI�1G
TIME TIM� INTENS�TY Q 1D0 Runoff Release Required Required
cum i p0 year Volume Cum total Detentian Detention
-.,._..._------- -
..----
(mins) (secs) (inlhr) (cfs) _(ft^3} (ft^3) (ft"3) (ac-ft)
. --- -
0 0 0 0.00 0 0.0 0.0 0.0000
5 3Q0 9.95� 5.01 15Q4.44 105.0 9399.4 6A321
10 600 7.724 3.89 2334.528 210.0 2t24.5 O.a4$$
_. -- ... _
15 940 6.520 3.29 2957.472 315.0 2642.5 0.0607
20 1204 5.600 2.82 3388.88I 420.0 2966.9 0.068'#
--...----...-------... .. - - .-- -- . .-
25 1500 4.980 2.5'� 3764.88 525.0 3239.9 0.0744
30 1800, 4.520 2.28 4100,544 630.4 3470.5 0.0797
. -.._...._..,. -- --
35 2100�� 4.080 2.06 431$.272 735.Q 3583.3 O.D823
- ---- - - ---- _ . --- -
40 2400 3.740 1.88 4523.9Q4 84D.p 3683.9 0.0846
_.._.. . T_ _ .. - ---.._._ . _ �--
45 2700 3.46� 1.74 4708.368 945.a 3763.A 0.0864
------- -_ _..- --- - -- --
50 3000 3.230I 1.63 4$83.76 1050.0 3833.8 D.0880
--- -...---- -
55 3300 3.430i 1.53 5439.496i 1155.0 3884.5 0.0892
60` 36�0 2.8fi6 1.44 5189.184 1260.0 3929.2 0.0902
- - - --� - -
65 390Q 2.720 1.37 534fi.432 1365.0 3981.4 O.p914
_..... .__._..._. .-- -- - - ---- ---._...
7D 420D 2.590 1.31 5482.512 1470.0 4012.5 0.0921
75 4500 2.480 1.25; 5624.6A 1575.0 4049.6 4.0930
--._ _..__._...------- ---
$0 4840 2.384 9.20� 5757.696 1680.0 4077.7 0.0936
85 51 ab 2.290 1.15 5886.216 1785.0 4101.2 Q.D942
-�- - - - -_ _
90 540d 2.210 1.�1 6014.736 1890.0 4124.7 O.Q947
�_._...... -----.. _
95 570d 2.�30 1.07 6119.b6A, �995.D 4124.1 0.0947
---- -- -..
100 6000� 2.060 1.04 6229.44 2100.0 4129.4 O.D948
105 6300 2.000 1.D1 6350.4 2205.0 4145.4 0.0952
110 6600 1.940 0.98 6453.216 2310.0 4143.2 0.0951
- ------- --.. ----
______ i15!_ 6900 1.890 0.95 6572.664 2415,Q 4157.7 0.0954
---- - - ----- -- -
12p 7200` 1.840 D.93 6676.992 2520.0 4157.D� 0.0954
--- ---...._., _,.- - -r,... ._.._...---�..----.....
125 7500 1.790 0.90 6766.2 2625.0 4141.2 0.0951
�30 78Q0 1.750 0.88 6879.fi 2730.0 4149.6 0.0953
135i 8100 1.710 0.86 6980.904 2835.0 4145.9 0.0952
-- �--- ----.._.. .. . _ ..._._ - -- -- -._... .
140 8aR0 i.67a 0.84 7070.112 2940.0 4130.1 0.0948
145 87001, 1.630 0.82 7147.224! 3045.0 41d2.2 Q.0942
. _�.....--- -- -
150 9000: 1.6D0 0.81 7257.6� 3150.0 41Q7.6 0.0943
--
155 __9300; 1.570 079 7358.904I 3255A� 4103.9I t}.0942
. - -
160 9640' 1.540 0.78 7451.136 3360.D'� 0.0939
-- ...,_,._._.._. _.__.. __ . --
165 990ff 1.510 0.76 7534.296 3465.0 4069.3 Q.0934
170 10204 1.480! 0.75, 7608,384 3570.0 4038.4 4.0927
175 10500 1.450 0.73 7673.4 3675.0 399$.4 O.D918
18Q 10800 1.G20 4.72 7729.344, 3780.0 3949.3 0.0907
I 185 11100 1.400 0.71 7832.16� 3885.0? 3947.2 O.a906
190 11400 1.380 0.70 7928.928 3994.a; 3938.9. 0.09D4
195 11700 1.360 0.69 80'49.648 4095.0 39�4.6� 0.090f
200 12000 1.340 0.$8 8104.32 4204.fl 3904.3` D.0896
205� 12300 1.320� 0.67� 8182.9h4 4305A 3877.9 0.0890
210 126D0 'E.300 O.fiS 8255.52 aA��0.0 3845.5 0.0883
2�5 12940' 1.280 0.65 8322.048 45'f 5.4 38d7.0 0.0874
220 13200 i 9.26p 0.64 8382.528 4fi20.0 3762.5 0.0864
225 'l3500 1.244 0.62 8436.96 4725.0 3712.01 0.0852
230 33800 1.22Q 0.61I 8485.344 4830.0 3655.3' 0.0839
--. �..r - -..
235 1a10� 1.210 0.611 8598.744 4835.0 3663.7� O.p841
240 14400 1.200 0.60: $709.12 5040.0 3669.1 0.0842
Page 9
Detention Basin Outlet 5tructure Qesign
UD-Oetention,Verslon 3.67(Kebruary 2017�
Summary stage�nrea-volurrte�0lscharge Rclationships
._. .... . _ . ...i. �.p;..l-ir-i].�.�.rt.,r ig u�n .-rc.f.r��il .,r ,-��i tt�,��_u _. _[.n-.. -�I u i�.,'�.-.n� �,i d....
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Sta8e.5tuag� S�y� Am �na YNum Yqwrr Twl . . ' ���..
W11bw
o.KnNwn Ihf IMx] Ixae�l I�o^31 I.�-nl I�kl
5023.9 o.op � 0.000 0 a000 D.00 Far hesF fesults,I�dudr thc
5024 U.1b
70 0.002 4 aopo p,pp stagesafallgradeslope
5029.1 p,2a 336 0,006 z2 oppl p,pp �h'�Hes(e.g.15VandFloor]
Srom¢he 5-A�V ta61e on
5�24.2 Q.30 990 O,OS3 86 O.GpZ 0.01 Sheet'6a51n'.
i024,3 0.40 1.762 o.a4o 273 0.005 0.01
5o2a a 0.50 7.671 tl.061 4na a,ola o ol qlsa include the inverts of all
5014,5 o.Go ?�6a O.W3 720 0,01� O,DI outle[s�e.g.verii��lofifce,
SOZ4 G 0.70 2,7G4 0.p5} 997 0.023 0.07 oveffl6W gfat¢,dnd splllway,
5024.7 0.80 2,7G4 OOG3 1.273 0,029 0.02 w�creapplicable).
5024.8 u,9p 2,764 O.OG3 1,SSa q03G 0,�2
502d.9 1.00 2,765 0.953 1,82fi 0,092 ❑03
A25 1,I0 2.]55 0.663 2.103 0.048 0,17
SU2i.2 ]_zp 2,]65 0.063 2,379 0.055 0.25
5025.2 1.30 3,765 0063 2,656 �.6G1 0.26
5025.] 7,qp 7,76G D.063 2932 6.067 �.27
5975.4 1.50 2,]fi6 O.W3 3,209 b974 0.38
5025$ ],(� 2,7GG O.Ofi3 3,485 6.660 �29
SV25.G �,]p 2,�G6 0.064 3,]62 a.Q84 0.3u
5f125,7 ].IIO 2,767 0069 4,039 D.093 �.33
Sn25.8 F.90 2.7G7 0,064 4,375 A.099 6.32
SU25.9 2.90 z,75$ O,W4 4,592 alos 6.33
5o2G-q�1i nValVmc 2.10 2,7fi8 O.Ofi4 4,897 0.112 b.3A
502d.1 2.20 I.7G6 O.W4 5,173 0.119 0_ia
502L.2 2.3� �,�69 0.064 5,456 0.125 0.57
5024.3 2,40 2,764 0.0(4 5,727 O,131 1.0]
5oTG.4 2,50 7.7G9 �.064 6,uM 0,136 1.a3
501G.5 2.En 2,769 �.059 6,28I 0,144 Z,85
S62G.G 2.74 2,770 U.tl64 6,SSA 0,157 4,26
Sa2�_i-TopolFrf��b0�rd 3,2� 1•��a �.�d 7,743 O,1B2 14,D2
Detention 8asin Outlet SYructure Uesig�
UQ-0ete��don,versivi�3.�7�Feurunry 2�37)
Project:Cherry Street Cotlagcs
Bssin I�:
� "tr�"FN�oN-�-�-'- --- Stage{H� ZorteVolume(ac-ft) OWletType
Ez
ra.�Itunr7_.""°�v�� ,..-_-, �
Zanel�Wq[V� U.52 0,012 ori�ccv�ate
l
i owr��� 1one2�100-yeary 5.34 0_052 Weir&Pipe{q[strltt}
MUWN[H�-..- OPiYKLSX� �E TOrtE3
"O°` Example Zone Configuration(Rekention Pontly
4.064 TO�d�
llser InpuC Orifice ai Ilmderdrain Outlet(typiply used to drain WQLV In a Rkratlan BMPj Cakulated Parameters for�nderdsain
lJnderdrain Qrifice Invert 6epth= N)A fl�distance helow tf�c tliralian media surface) Underdrain Orifice Area= N/A {t'
UnderdrainOrEf4e�iameYer= NfA inches Vnde�drainOrlficeCeMraid= NfA Feet
❑ser Input OriTice Plate with one or more arHices or Elliptical Slm Weir(typlcally used to drein W 4CV:nd)or EUN V in a sedime�tatkn BMP� Glcula[ed Parameters far Plate
Invcrto(LowestOrifice= 0.00 ft(relaCwem6asinbot�omatslugc=Ok7 WqOriliceAreaperRow= 1.369E-n3 h�
Dev1h at top of Tone using Oriflce Plate= l.00 k[relacive to b�s�n botlom at Stage=0 k� Elliptical H�ILwidth= N/A feeF
Orffice Plate�,Oriflce VerYicalSpacing= 4.00 inches E3liptical5lot Centroid= N/A feet
OrifEcePface:OriflcedreaperRow= 0.2U sq.in�hes�diameter=7/2lnchp Elliptical5lmArea= N�A h+ .2,1
User Input:Stagc and TotaF Area of Each Orifice Raw�numhered Trom loweatlo highaft)
Raw 1 Srequiied) Row 2(opfional) l7ow 3(nptionaq Rav+4{optionaq Row 5(aptionaq Row 6(optional� Row 7(option3q Row 9(aptional}
SlageofOrihceCenhoid{fl) 0.00 0.30 0.60 09n
Orifice Area�sq.iaches) 0.2Q D 28 0_20 0,20
Row 9(optionalj Raw 10(optionaq Row 1 i optionap Row 12(optional} Row 13(o tional} Row 14(optionaq Raw 15{optfanaq ftow 16(oplionalJ
Stage al Orifice Centraid(R)
Orkfice fvea{sq.inches)
113@rinput:VNMiCaIOfHICe[ClYculararReRangular) CalculatedParametersfarVerticalorifice
Nofsekctzd NOTSelected NMSelccted NMSelec[ed
InvertaFVerticafOrifice= fl(relativetobas'm6ottomat5tage=�(t} VertrcalOriTiceArea= g�
Oepth al mp of Zonc�sing Ver�ica!Orifice= ft{relative m has'm bmmm al S[aee=0 k] Vertical Orifim Cemroid= fect
Vertical Orifice Diameter= mches
User InpuF:Orerllow Weir(�ropboxJ and Grete{Flat ar SIapM} Cakulated Pareme[ers far UverRow W eir
2one2Weir Nmielected 2one2Weir NofSeiected
OverflawWeirFmntEdgeHcight,Ho= 1.00 k(reWtive�a4aslnbvitomat5tagc=0fq NdrgMatGrateUpperEdge,W� 2.no feet
overflow Wefr Fram Edge Length= 3 uo Feel Over Flow W eir SEope lenglh= 3.16 Feet
O�erflowWcir5lapc= 3.09 H.N�enterzeraforflatgra[e} GrateOpenArea/luo-yron£�reArea= 135.68 shouidbe>4
Horix.LengthofWeirSides= 3.04 fem OverflowGratcOpenAreawfo0ehris= 6.64 h�
Overflow Grate Dycn Area%= 7046 ;K,&rate open area/total area Over(low Grate Open Area w/Dehris= 332 h�
DehrisGlagging'ffi= 5u^�6 %
lsser inpu[:Outlet Pipe w f Flow Res7ridbn Plate�Circular Odfice,Resirictar Plate,o�Rectangular OriTice] calculafed Paremeters£or Outlet Pipe w/Flow Bestriction Plat[
2one2Restrinor NatSeietted Zone2Restrictor No[Selec[ed
Depth ro Imert of Ou[let Pipe= U.QD R(distance beluw hasin hprtPm atSteAe=411� Outlel Orifi[e AfCa= 0.05 k�
OutfetPipe�lameser= kon fnches OuNetO(iFiceCentroid= 0.08 Feet
ResF�icto�Platc He�gh�Ahnve pipe Inven= 7.58 inches HaIGCentral pngle oF Restrictor Plate an Pipe= n92 N/A radians
User Input:Emer�ency Spillway�pectangular nrTrapexotdal) GlcuiatM Parameters for Spillway
Splllway Invert Stage= 210 ft{relative m hasin 6otmm a�Stage=R k) Spil4way�esign Flow Depth= 0.79 FeeY
SpilfwayCrestLenglli- 2,00 feet Sfige3tTopofFree6oard= 4.49 (eet
Sp�llway End Slopcs= 4.00 H:V Basin Arca at Top of Free6oard= o 06 acres
Free6oard above Max Water Surface= 2.00 fcet
Routed Hydrograph Resulu
Qesign Smrm Rehlm Pcriod= W4CV EURv 2 Ycar 5 Year la Year 25 Year 50 Year lnu Ycar 500 Year
One-�'au�Ra'inF�li Deplh(in)= 0.53 1,07 0.90 332 2.60 1.95 2.18 2.60 3.27
Calculated AunoR Volume(acre-fl)� 0.012 �.032 O.Q23 Q.039 �.n53 0.078 0.095 0.121 O.1b5
4P710NAL OveRide Runaft Valume{aem-fQ= a_l�2
Inflow Hydrograph Volume(acre-fl)= aull 0-032 0,U22 0.039 4.052 4.076 0,098 0_]12 0.164
Predevelopmen[Uni[Peak Flow,9(chfaue)= 0.00 0.00 0.01 0.07 0.21 aS5 0,76 1.02 1.49
PfetlevelopmCniPeak(]{Cfs�= O.Q 0.0 0.0 O.z 0.1 0.4 0.5 �.7 1.0
Peak InAow�(cfs)= 0.1 0.4 R.3 0.5 0.7 1.0 F.2 1.4 2.1
Peak Rutfiow Q(cis)= o.9 OA @0 O.a 0.1 0.3 n_3 �.3 0.4
Ralia Peak OutAow to Predevclopment Q= N/A N/A N/A 0.3 o S 0.7 6.5 6.4 0.4
5lruclure GonUolling Flow= Plate Plate Pla�e Pla[e Over4ow Grate 1 Ou[le[Pla[e 1 Outle[Platc 1 Outlet Plate 1 spillway
Max Velocity ihrough Grate 1(fps)= NfA N/A N/A N/A 0.0 0.6 0.0 o.0 �.0
Max Vebcfry ihraugh Grale 2(fpsJ= N/A N/A N/A N/A M/A R/A N/A NjA NfA
rme lo Qrain 97%oi Inflew Volume(hours)= 46 38 51 55 52 51 51 49
rme to Orain 99%oFlnflow Volume(hours)= LG 48 40 54 59 58 58 58 57
MaKimum Ponding�epih(R)= 0.48 079 0.65 0.40 1.05 L2z 1.43 1.60 2.23
Area al Maximum Ponding Oepth{acres)= 0.06 0.05 0.0G o.n5 0.05 0.05 0.06 0.06 0.06
Maximum Volume Smred(acre-R}= u.alu �-�29 R020 0.436 0.045 0.056 0.069 o.oso 0.120
Detention Basin Outlet Structure Design
_ VD-Detention,Version 3.07�Fe6ruary 2017�
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NOTES TO USERS LEGENA
Tm mza�9��i�-e i„acmi�:a:eri:a mo ti�ei��.,nsi Fa� �,.��.n:m a�y�a�r.i� J sREcuu �laoa rv,znRo aaEas (SFH0.s1 suwEcr ro
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To W:an mae ffa:a'::wJ in!um¢f��x�n aioas xhere �ese Fleoil Elevailone w:5y>.s ,, 5`rNcr u l, � �' - c.u_nx �oa me kn k ma uo.r�ha p�+a�'�9 M uu sA c^+wu c+�s�a rza�aae�
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APPENDiX E: ERQSIQIii CONTROL REPORT
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Final �rainage ar€d Erc�sion Contra) Report
25
Cherry Street Cottages
(previously referred �o as "P�erce Subdivision"�
Ch�rry S�reet and Lyons Street
Appendix E
Fina� Erosion Control Report
' prepared �or
Mr. Evan Gilmartin
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August Z 8, Z 018
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; Sorensen Engineering & Construction, LLC
F Civil/Environmental Engineering
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[ �.901 Bear Caurt
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( Fort Callins, Colorado 80525
; (970) 590-1579
A. GENERAL LOCATION AND DESCRIPTION.................................................................................1
A.7.. �ocation............................................................................................................................................1
A.2. Nature of Cons�ruc�ion Activity at the Site.......................................................................1
A.3. Prapo��d Sequence of Major Activities..............................................................................1
A.4.Soil Data............................................................................................................................................2
A.S. E�isring Vcgetative Cover.........................................................................................................2
A,6. Locatian of Potential Pollution Sources.............................................................................2
A.7. R�e�iving Wa�ershed..................................................................................................................2
A.B. List of Best Management Practiices (BM1's)......................................................................2
�. STORMVIrATER MANAGEMENT CONTR�LS.............................................................................3
B.1.Administrator................................................................................................................................3
B.2. identification of Potential Pollutian Sources ...................................................................3
C. DRYLAND V�GETATION....................................................................................................................5
' D. DETAIL�D CONSTRUCTION ACTIVITI�S SEQUENCE...........................................................6
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� D.1. Installation of Temparary Erosion ar�d Sediment Control Measures....................6
D.2. Sequenc� of Land Disturbing Activiry.................................................................................6
D.3. Drainage Facility Constructian..............................................................................................6
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� D.4. Sediment Bas'rns,Temporary Channel Stabilization.....................................................6
D.S. Soil Amendment...........................................................................................................................6
D.b.S��ding.............................................................................................................................................7
D.7. Mulching..........................................................................................................................................7
D.$. Required Mainte�ance Activities..........................................................................................7
D.9. Final Stabilization and Site CIean Up...................................................................................7
E. EROSION CONTR4L SECURITY CALCULATIONS....................................................................7
F.ATTACHMENTS.....................................................................................................................................7
: �'.1. BMPs from Urban Storm Drainage Cri�eria Manual Voiume 3..................................7
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€ F.2. Erosian ControI Security Calculations.................................................................................7
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A. GENERAl. LOCATION AND DESCRiPTION
A.1. Location
The Cherry Street Cnttages project site is iocat�d in t�te �f�%, Sectian 10, Township 7
Narth, Range 69 West afthe 6th Principa[ Meridian, City of Fort Collins, County of
Larimer, Stat� of Colorado. The praject site is bordered to the north by an existing
single-family residential praperty,tv the east by single-famify homes {Ha�na Farm
Neighborhood),to the west by Lyons Street and single-family homes (Mountain View
H�ights), and to th� south by Cherry 5treet and the Putnam School. The site is currently
eo�ered with native grasses, with approximately 80%��getati�e caver.
Best Management Practices (BMPs) are describeci in this report that wifl be
` implemented to reduce and minimize erosiv�forc�s and sediment transpor�off-site as a
result of constructian activities. BMPs wifl be implemertted and maintained as need�d
' during ali construction a��ivi�ies, and they wi11 be maintain�d after tFte conclusion of
'� cor�structior� acti�ities until final ground cover stabilization is�omplete ar�d the threat ot
off-si�e sectiment transport is remaved.
A.2. Nature o#Constructior�Acti►�ity at the Site
The�atal dis�urbed area will be roughly 48,330 square fe�t (1.3 acres}. Because this area
g exceeds the 1.0 acre threshofd, prior ta any earth-rr�o�ing activities on this site,the
� Contractor shall obtain a Colorada Discharge Permit System (CDPS) Stormwater
� Discharge Associated with Canstruction Acti�rities Gerteraf P�rmit. The praposed
development wil) include six (6� dw�lling units. Constructian activity will be typical of
srr�all resid�rttial developments, as discussed below.
An access driveway/alley will be located along th� north side of the prnperty. This
e driveway will f�e construct�d of concrete and wilf ha�e an in�erted crown allowing it to
� con�ey si�te runoff ta the de�entian pond.Traet A, dedicated as a stormwater detentian
� pand, wifl be located on the east end of the property. 7he inlet ta the de�entior� pond
� will be (ocated on the northwest corner of the pand, and the outlet wifl be located on
the south side of the pond, c�ischarging via a drain pan thraugh a sid�walk chase to the
� Cherry Street curb and gutter flow. 5tormwater runoff from the site would proceed east
� via Cherry Street gutter flow, thence north along Fran[clin Street drainage, thenc� �o the
' east�ia Vine Drive drainage ta a paint west af Shie[ds Street,thence north to the
' Poudre River'.
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i A.3. Aroposed Sequence af Majar Actitrities
; The project wilf be constructed in a sing[e phase with the following sequence of
construction acfi�ity:
1, Install and implerr�ent construction boundary erosion fence (silt fence), street
infet sediment protectian, and vehicle tracking contral;
2. C[ear, grub, and stockpife topsoil—imp[ement soil stnrage area sediment
controls and other constructinn storrrtwater control BMPs, as discussecE below;
3. Grade and eonstruct en�rance/access road and detention pond;
Final �rosion Contro[ Report 1
4. Complete home and garage eonstruction on all lots;
5. Canstruct retention walE, sidewalks, deter�tion pand ou�let works;
5. Complete fi�al grading, landscaping and final site stabilization—seed/sod ail
disturbed non-surfaced areas; and
7. Remove BMPs and cornplete finaf site el�anup.
A.4. Soil Data
In general, the soil on the site consists of loam classified as Hydralogic Soil Group C-�a
factor that is ent�r�d in the UD�CD 5tormwater Detention and Infi[tration D�sign data
sheet. Soils in thiS group generally incfude sandy [oam and sandy clay loam. Runoff is
typically s[ow, and wind and water erosion hazard is s[ight�o moderate (Soil Sur�ey of
Larimer County Area, Coiorada, United Stated Sail Conser�ation Ser�ic�, 1980). Prior to
canstruction af the access driue and indiWidual hom�s, the contractor shaf I complete
site-speeific soil testing to confirm bo�h pavement design and footing/foundation design
criteria.
A.S. Existing Vegetati�e Co►►er
�xisting�egefatian cansists af approximately 70% native grass and weed caver across
� the entire property with fair to rrZoderate vegetati�e cover density.
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A.fi. l.ocation af Potential Pollu�ian Sources
The contractor (as yet to be named) shall identify potential po[lution sources and
implemenfi BMPs to minimize the ris�of pallution outside the construction ar�a.
Potential pollution saurces will ger�erally be restricted to on-site locatipns and may
include sediment c4ischargE, vehicle rr�aint�nance and refueling activities that occur on-
site, miscel�aneous constructian debris, and fugiti�e dust generation fihat could impact
� neighboring proparties.
�
E
� A.7. Receiding Watershed
� Water released fram the detention pond wil! flQw ta the Ch�rry 5treet curb and gutter
j in the southeast corner of the property, thence to s�treet/curb drainage to the east to
; th� Franklin Str�et curb, thence north to an open fieEd on the north end of Franklir�
E
; Street. Runoff then sheet fiows across the grassed field (receiving the benefits fo grass
� filtratian)to tf�e drainage along the south sid� of Vine Dri�e, thence�o the east into a
�
` cu[�ert at the northeast corn�r of the grassed�ield, thence via starm sewer to the
, Paudre River.
i
A.S. List of B�st Management Practices (BMPs)
' Table 1 pro�ides a list of proposed or poterttial BMPs that shall/may b� im�lemented or
utilized by the cantractor as needed during construction. Detailed descriptions of the
identified BMPs ar� provided irt Attachment 1 ta�his Erosion Control Report.The
selected BMPs are based an Urban Storm Drainage Criteria Manual, Volurr�e 3.
Final Erosian Contral Report 2
De�ail I€l Description Detaii ED Description
EC-1 SR Surface Roughening S-7 - Vehicle Maintenance, Fueling,
a r�d Starage
EG2 T5/PS Temporary and S-9 - Landscape Main�enance
Permanent Seeding
EC-A� MU Mulching SC-1 SF 5ilt Fence
EC-8 TOP Temporary Outlet SG5 R5 Roek Sock
Prot�ctian
EC-14 DC Wind Erosion �ust SG6 IP [nlet Protection
Control
MM-1 CWA Concrete Washaut Area SM-3 CF Construction Fence
MM-2 SP Stockpile Managemen� SM-4 V1'C Vehicle Tracking Cantro[
MM-3 GH Goad House[ceeping SM-6 SSA Stabilized Staging Area
Practices
� S-5 GH Good Mousekeeping
Tak�fe 1. Proposed Best Managem�nt Practices
8. 5"CDRMWA7ER MANAGEMENT CQNTRQI.S
� B.1.Administrator
� 7he seleet�d contractor shall identify a persort knowledgeable in erasian prevention antl
�
[ sediment contral who wifl o�ersee the irrz�lementation, inspectian, and maintenance of
the erosion pre�ention and sediment control BMPs befare and during construction. Th�
contractor's inspector shall inspect the cnns�ruction site once every s�v�n (7) days and
within 24 haurs after a rainfall event of greater than 0.5 inehes in a 24--hour period.
I
' The cantractor shall keep a record of inspections and maintenance cond�cted c�uring
€
E constructian. These records rr�ust be retain�d in th� stormwafer pollution Pre�ention
� plan. R�cords of each inspection and maintenance acti�ity shall incfude
�
I
� • Date and �time of inspection;
� • Name of person�s) conducting ir�s�aection;
; • Findings of inspection, including recommendations for corrective actians taken
€
[ (including �iates,times, and party comp(eting maintenance acti�ities};
€ - Date and amour�t a�rainfall events greater than 0.5 inches in 24 hours;
i
i • Docurnentation of changes made fio the BMPs shown on�he erosion con'tra!
' plan.
B.2. ldentification of Patential Pollution Saurces
Potential polfutio� s�urces inc[ude the following:
• Disturbet� and Stored Soi[s. �oif disturbance will occur within�he Cherry Street
Cottages impro�ement area during both infrastructur� and home constructian
acti�ities. Sift fencing will be installed around the perimeter of�he property. Soils
exca�ated during home canstruction and road hase materiaf far the aecess
Finaf Erasior� Contro) Report 3
driveway improvements may be stor�d temporarily on the �roperty. Any soil
stockpile will be within an area enclosed by silt fencing to pre�ent sediment
transport from these areas.
• Ve�icle 1"rac�cing of Secfiments. Vehicles lea�ing th� construction zane may carry
soil and other potential pollutan'ts aff-si�e and onto adjacent City streets (Lyons
and Cherry Streets). To control this, a �ehicle-tracking pad will be situated at the
driveway entrance off of Lyons Str�et at the exi� point from the subject property
to Lyflns Street. Materials that are tracked off-site and anto adjacent streets
(Lyans S�reet), shall be scraped and swept as needed, but at least at the end of
each day if materials ar�observa�le on the street.
• Contaminated Soils. Contaminated soils are nat anticipated for this site.
Howe�er, constructian equipment routine maintenane� acti�ities that may occur
on-site or equiprnent malfunctions (e.g., leaking hydraulic hoses) could lead to
cfischarge of petroleum contamination onto the ground surface. If this shou[d
happen, the equipment owRer will bear responsibilifiy for cleanup of�he
contaminated soil. The confiractor will be required ta maintain a well-equipped
� S�III �fi� Q!1-Sf�@, with adequate on�-site personnel trained in Spill Prev�ntion,
Controf, and Cauntermeasure (SPCC) praetices to contain refeases.
Contaminated soils wili be exca�ated and removed from the site, with "clean"
soil remaining as verified by field sensing equipment (i.e., a portable volatile
organic campaund [VOC] monitor and/or a �hatoionization detec�or [PID]
� caf ibrated for the appropriate compouncis).
� • Loading and Unloading Operatians. Loading and unlaading operations will b�
canducted in a designated area to be enclos�d by silt fencing. Potentiaf pollution
from these activities will be cantrolled by�ehiGle�racking pad, silt fencing, and
good housekeepir�g practices.
• Otatdoor Storage Acti�ities. Qutdaar starage of building materials will be
restricted to areas adjacent to the homes being buil� and will be witF�in the silt
fencing enc[osed areas. Fertifizers and at�er chemicais will not be sfiored on this
� property.
• Vehicle and Eqtti�ment Main�enance and Fueling Acti�ities. Vehicle and
E construction equipment mainfienance and fueling acti�ifies may be conducted
; or�-site within a silt-fenced area. Additionally, as discussed abo�e, a welf-
equipped spil[ kit wili be kept on-site, with contraetor p�rsonnel trained in SPCC
` practices.
• Significant Dust and Partic�late Generat�ng Processes. Significan� dust and
[ particulate generating processes will be controlled in aecordance with the City of
�
� Fort Colf ins Fugitive Dust Manual. Accordingly,typical Best Management
Practices wilf include the folfowing:
! 1. Minimize fhe area ta be c[isturbed at any one�ime;
2. Reduce�ehicle sp��ds across the site;
3. 1"emporarily hal�wor�C activities during high wincf events;
Final Erosion Control Report ¢
4. Apply water ta exposec[ soils on an as-needed basis. A
wat�r truck wifl be on-site for water application to
suppress dust generation;
5. Surface roughening ar� areas during periods of inactivity;
and
6. Reestablish permanent�egetative co�er as soon as
possible after construction acti�ity is complete.
• Routine Maintenance ActiVi#ies. Routine maintenance acti�ities in�olving
fertilizers, p�sticides, detergents, fuels, solvents, oils, �tc. wil[ be kept to a
minimum. Such activi�ies, if occurring on-site, will be canducted within the
perimeter silt fencing and with spill kit(s) an hand to irr�mediately cl�an up any
release of such materials.
• On-site Waste Management Practices. Ort-site wast� management practices wili
consist of dumpsters and/or rol!-off con�ainers located on-site forth� duratior�
of construc�ion aeti�ities. Good housekeeping practices will include regular
(daiEy) canstruction debris pickup and r�mo�al as well as general site
� maintenance.
:�
• Concrete Truc�C Eq�ipment Washing. A cor�crete washout pit will be established
and maintained by the contractor durir�g constructian. This pit wilE be located
near the narthwest eorner of the property, near the aforemer�tioned �ehicle-
tracking pad. The pit wili consist of an area of approximately Za' x 20' excavated
; ta a depth of approximately Z'. The pit will be lined with �lastie that wi[I contain
� the wash-down water and canerefe material from the truck chutes and drums,
� plus waste concrete far small construction equi�m�nfi, including wheelbarrows,
shavels, etc. The water wilE b� allowed to e�aporate, and the rernaining
concrete materials will solidify, upon which time the hardened sofids will be
bro[cen down and remaved from�he site.
• [7edicated Asp�alt and Cpncrete Ba�ch P�ants.Ther�will be na dedicated
asphalt or concrete batch plants on thi� si�e.
• Non-industrial Waste 5ources. Non-industria[ waste sources wi[I be controlEed
by regular daily good house[teeping practices and the use of an on-site dumpster
or roll-aff container for non-industrial wastes, including warEcer trash. A portable
� toilet will be positioned on the property by the cantractor, will be anchored tQ
pr�vent tip-age, and will be placed nn a so[id dirt surface. The portable�oile�will
; be maintained fiorthe cfuration of constructiort activities.
€
; • Other Potential Spills. Other potential5pills, passif�ly associated with
E groundwat�r and stormwater dewatering practices, are not anticipated far this
�
prpject.
C. DRYLAN�VEGETATION
Es�ablishment of dryland �egetation is not anticipated for this pra}ect. As noted in the
City's pre�ious earr�ments of May 16, 2p18, fhe detention f�asin wil! indeed b�seeded,
and wi[f moreo�er ha�e several trees planted therein. This area will be irrigated, so
there is r�o "dryland �egetation" anticipat�cf.
Final Erosion Control Repor� �
D. DETAIL�t] CONSTRUCTION ACTtVITlES S�QUENCE
7'he selected generaf contractor wiEf establish a mor�specific constructian sequence artd
schedule, but the overall sequenc�of construction acti�ity should follow th�general
path gi�en belaw.
D.1. Installatian af Ternporary Erosion and 5ediment Canfrol Measures
Silt�encing wilf be instailed around �he praperty perirneter. On this relati�ely flat parcel,
off-si�te sediment discharge wil[ also be controllec� with �ehiG[e tracking and sediment
filtering,to be established at th� northwest corner af the property at th� point of aecess
firom Lyons Street.
�.2. Sequence of land Disturbing Actidity
As mention�d above,�he genera[ eontractar responsibfe for infrastructure instaliation
; (water and sewer pipe and other utility instaliation), as wef! as far the rear access
driv�way, wi[I submit a detaiied canstruc�ion sequence schedule at the time of
contrac�ting. Hawe�er,the following sequence will generally be follawed:
�.. Existing surface ��g�tation stripping and soi[ roughening;
� 2. Soil import and o�eriot grading;
� 3. Detentiart pond (Tract A) grading;
� 4. Access dri�e�way grading and suf�grade preparation;
5. Utilities installation, inc[uding efectrieal, water, and sewer pipe installation, with
service s�ubs to each lot;
6. Access driveway surface finishing, cor�sisting of a 6-inch inver�ed crown cancrete
� surface;
� 7. Home site construction--fihe sp�ei�ic timing of vuork to be done on these lats as
ye#to be determined;
� 8. Construction af retaining walf, sidewalfcs, and detention pond outlet structure;
' 9. Final grading;
� 10. Establishm�nt of final �egetation; and
€ 11. Silt fencing and �ehicle tracking pad remo�al.
�
€
; D.3. Drainage F�cility Construction
€
( The only drainage facility required �ar this subdi�ision is the det�ntion pond in Tract A,
�
to be graded and shaped following the sequence outfined abo�e.
D.4. Sedimer�t Basins,Temporary C�anne) Stabilizatinn
No sediment basirt is requ�red, nor will ther� be any char�nel stabilization requirernents
for this project.
D.S. Soi� Amendment
Prior to seeding and mufching,the sofls shall be amended in accordance with City Code
12-130 fihrough 12-132. Such provisians sha[I be accomplished to �r�hance soil water
storage capacity, irnpro�e condi�ions for plant growth, and reduce water runoff. Soil
Final Erosion Control Report (
amendment procedures potentially us�d at�this site may include the addition of
compost, peat, ag�d manure or other such organie or inorga�ic material appropriate for
this site. Top sQil replaced on the site shall have organic content greater than 5%, ar�d
shall be free of noxious weeds and roots, salts, c[ay lumps, or any non-sail materials.
D.6 5eeding
Immediately upor� completion of access dri�eway and t{etention pond grading, the
detention pond area of 7ract A wiil be seeded for perrr�anent�egetative cover. A[so,
immedia�ely upan comp[etion ofthe sidewalks and retaining wall, the parkway areas
will be seeded (or soddedj, and indi�idual Iats will be seeded (or sodded) as home
construcfiian pragresses.The right-af-way outside vf th� access dri�eway surface will be
seeded with nati�e grasses appropriate forthat area. The applicant understands that
� the seeding wilf follow the accept�d and apprnved Final Landscape Plan.
�
D.7. Mc�lching
ImmediatEly upon se�ding af all disturbed soils, r�-�ulch will b� applied as required to ali
� exposed soil surfaces to maintain sail moisture and protect the seeds and new growth.
D.8. Required Maintenance Acti►►ities
Lor�g-term main�enance wilf include periodic (as needed) de�erttion pond clean-au#,
� specifically in the area of the inlet in the nor-thwest corrter of Tract A and the outle�
�
works near the sauthwest corner nf tl�e detention pond in Tract A. Accumulated
1 sedimen�will be remo�ed. The perir�eter silt fencing will be irtspected once e�ery 14
� days and after every preeipitation e�ent of greater than 0.5 inches, and aecumulated silt
deposits wilE b� remo�ed. Damaged silt fencing wifl be replaced immediately upon
disca�ery of damage. All other erosion control features, includirtg wattles, rock socks,
etc., will be inspected periodical[y (at least ance e�ery �.4 days) and after each major
f �recipi�ation e�ent to assess candifion. Cleanup and removai of accumulated s�l� and
e sediment wii! be under#aken immediatefy upon obser�ation ofthe silt. The vehic[e
j tracking pad and concrete washout pit wil! be regularly inspected and excessi�e material
I r�moved.
�
; D.9 Firtal 5tabilization and Site Clean Up
�
j "Finaf Sfiabilizafiion" will he acEcnowledged when ail sod is install�d and all seedeci areas
! have achieved 7�%�egetative co�er. Upon m�etingthis criteria, fnal site clean up,
inc[uding the remo�al af control measures,will be completed.
E. ERQ510N CONTRQL SECURITY CALCULATIONS
Erasion cor�tral s�curity cafculations are prnvided in Attachm�nt Z to this repark.
F. AITACHMENTS
F.3.. BMPs from Urban Storm Drainage Criteria Manual Volume 3
F.2. Erasian Contral Security Calculations
Final Erosion Controf Report '7
Attachment �. BMPs fram Urban Stvrm Drainage Criteria Manua!
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Final Erosion Control Report g
Surface Roughening �SR) EC-1
Description � `F '
r u ���� ��+- � ��
Surface roughening is an erosion control ?.� - �-- �' - .�:� . ,. .
�- . _ . �,.:�
practice that involvcs tracking, �:� � ' � ��`�` ,
scarifying, imprinting, or tilling a .' � � �
disturbed area to provide te;nporary �� �`�� �w . :�_
stabilization of disturbed areas. Surface �''' �.,��'�-�'-.� - � _ .���',�
rou henin crcates variations in the soi[ »�- � �' � "� �"'� �f�
g g „�,�� ., --�� -_ _�`�'�'*�. �� « .:���;',.i�
surface that help to minimize wind and ' _ �'y`���'�`- _.- _� �. �'��� �
�..�. �. _�•, .�. _
water erosion. Depending on thc ;�` _�,.r�"�,��'"��'�.,..�` � �`�.�
techni uc used surface rou henin ma ' ������ '`�"'�"����"'"'�''
q g g Y � .-: �r� -
also help establish conditions favorable ,.�= �����►„�*"�, � � � � �`�
to cstablishment of vegetation. �,�! ,�,,.���'"�"'� � � ' � '
e•.`-�„�'"�'..� � _ '� '�-"'� - . t�
�- .r� �`'3""t,a•�. ..ro, ..- " .� ,�I� :
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Appropriate Uses ��.�� �`. '.,� � ,�-����
�`�� _.� . ����� �
SuI'f�Ce I"Dughening Can be USCd�O Photograph SR-1. Surface roughening via imprinting for tcmporary
provide temporary stabilizatian of scab�l�zacion.
disturbed areas, such as whcn
revegetation cannot be immediately established due to seasonal planting limitations. Surface roughening
is not a stand-alone BMF', and should be used in conjunctio� with other erosion and sediment contrals.
Surface rou�hening is often in�plemented in conjunction with grading and is typically performed using
heavy construction equipment to track thc surface. Be aware that tracking with heavy equipment will also
compact soils,which is not desirable in areas that will be revegetated. Scarifying,tilling, or ripping are
better surface roughening techniques ira locations where revegetation is planned. Roughening is not
effective in very sandy soils and cannot be effectively performed in rocky sozl.
Design and �nstallation
Typical design details for surfacing roughening on steep and mild slopes are provided in Details SR-1 and
SR-2,respectivefy.
Surface roughening should be performed either after final grading or fo temporarily stabilize an area
during aetive constructinn that may be inactive for a shart tirrie period. Surface roughening should create
depressions 2 to b inches deep and approximately G inches apart. 7'he surface of exposed soil can he
roughened by a number of#eehniques and equipment. Horizontal grooves(running parallel to the
contours af the land) can be made using tracks from equipment treads, stair-step grading,ripping, or
tilling.
Fii] slopes can be constructed with a raughened surface. Cut slopes that have been smooth graded can be
roughened as a subsequent operation. Roughening should follow along the contours of the slope. The
tracks left by truck maunted eguiprnEnt working perpendicular
ta the contour can leave acceptable horizontal depressions; Surface Roughening
however, the equipment will also compact the soil. Fanc#ic�ns
Erosion Gantra� Yes
Sediment Control No
Site/Material Management No
Novernber 2010 Urban Drainage and Flood Control District SR-1
Urban Stornt Drainage Crfteria Manual Volume 3
EC-S Temporary Qu�leti Protect�on (T4P)
����t��4 �� �:<_ ExTEND RIPRAP TO HEIGWT OF
CULVERT �R NORMAL CHANNE(. O P
� ����� �-` DEPTH, WHICH�I� IS LESS
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TEMP�RARY OUTLET PROTECTI�N PLAN
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� i.."..�,��,{„ r4 3H,.y�' � �-.�;� ��
� N(�N WOVEN r.Y
GEOTEXTILE � KEY IN Ta 2 x D54
AROUN� PERIMETER
5ECT14N A
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� TA6lE OP-1. TE�iPORARY OUTLET PROTECTION
s SIZt�iG TABLE
; PIPE RIPRAP DSO
APftON
� E?IAME7Eft, d15CHl,RG�, LENGTH, La ����TER
E �Q Q (CFS) MIN
E (�r�cr�Es) ��7 {��cH�s)
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� 12 5 i0 4
€ 10 13 &
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€ 1� 20 t6 9
, 3Q 23 12
€ 40 26 16
, 30 t6 9
24 �0 26 9
50 26 12
6Q 30 16
QP-1 . TEMPORARY �UTLET PROTECTfON
TOP-2 Urban Drainage and Flood Contral District November 2010
Urhan Storm Drainage Criteria Manuat VoIume 3
EC-1 Surface Roughening (SR)
Main�enance and RemovaZ
Care should be taken not to drive vehieles or equipm�nt aver areas that have been surfac�rough�ned.
Tire tracks will smooth the zoughened surface and may cause runoff to colIect into rills and gullies.
Because surface raughening is onIy a temporary control,additional treatments may be necessary to
maintain the soil surface in a roughened condi�ion.
Azeas should b�inspected for signs of erosion. 5urface roughening is a ternpozary irzmeasure,and will not
provide lang-term erosion control.
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SR-2 Urban Drainage and Flood Coni�ol District Novem�er 2010
Urban Storm Drainage Cz�teria Manual Volume 3
Surface Roughening (SR) EC-�1
`�_ S R
TRACKING OR
�"�� IMPRINTING
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"� 6„ Ie4AX
1-�' y~
� -� FURROWS 2" TO 4" DEEP
2" TD �.� WITH &�� MAXIh4Utv€ SPACING
fr 4" qEEp "�� PARALLEL �"0 CONTQURS
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3 SR-� . SURFACE ROUGHENING
�'OR STEEP SLOPES (3:7 OR STEEPER)
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� OR TILLING
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� �'' � ftoucw�€veo �otivs sr�A�.�. �� �" ro s"
; � �" TO 8" CIEEP WITH 8" htRX€MItM SPACSNG PARALLEL
l
�EEP Ta CONTOURS
� SR-�2. SURFACE ROUGHENING
F�R LOW SLOFES (IESS THAN 3:i)
November 2Q10 I7rban Drainage and�'lood Control District SR-3
Uzban Storm Draina�e Criteria Manual Volume 3
--
EC-1 Surface Roughening (SR)
�
1. SEE PLAN VtEW FOR:
-LOCATtQN{S) OF SURFACE ROUGtiENING.
2. SUftFACE ROUGHENING 5HALL BE PROVID�n PROMPTLY AFTER Cdh�P�ETIDN OF FINISSiED
GRAD?NG (FOR AREAS �IOT RECEIVING TOPSOIL) OR PR30R TQ T(3PSQIL PLACEMEN�' aR ANY
FORECASTED RA1N EVENT.
3. ARF1�S VJHERE �UILQING �'OUPlpqTIQNS, PAVEMENT, aR SOD w[�L 6E PLACEO wiTNQUT
OELAY IN TtiE CONSTRUCTIflN SE4UENCE, 5UR�AC� RpUGHENiP2G iS NOT RE(�UIRED.
4. flIS�'URBEO SURFACES SHALL BE ROUGHENEO €1SING RIPPiNG QR TILLING Ept11P�I�NT QN
iHE C6NTOUR OR TRACKING UP AN� dON1N A SLOP� USING EQUIPMENT TRE/kDS.
5. A FARMING �ISK SHA[.l NpT 9E USE� F�R SItRFACE ROUGHENIMG.
SI.ERFACE RQUGHE(dfNG MWNTENAfVC� NdT�S
1_ INSPECT BMps �ACH WpRKDAY, P,NO ltiiAINTAIN THEM IN �FF�C7IVE OP�RA7ING CQNOITI6N.
�fAiNTENAI�iiCE 6F BMPs 5H4lSLD B� PftOACT'IVE, NQT RFACTIVE. INSPECT BI�iPs AS SOON A5
POSSI6LE (AND AlWAYS WITHIN 24 HOLiRS) F�LLC3WiNG A STQRM THAT CAUSES 5�1RFACt
Ef2pSIQN, AND P�RFORM NECESSAftY �€P,INTENANCE.
2. FR�QUEPt7' OB5Ef2VATIQNS AND MAINTENAt�CE ARE PJECESSARY TO �1Alhf'CAIN BMPs IN
EFf EGTIV� QPERATING CON�ITION. INSPECTIONS ANQ CORRECTIV� MEASUR�S SHOULO BE
[}OCUMIENTED Tti0R0UGHLY.
3_ YUHERE BMPs F3AVE FAILE�, REPAIR qR R�PI.kC� llppN �ISCflVERY OF' THE FAILURE.
�. VEHtCLES ANO E4L11PMENF 5HALL NOT BE ORIVEN OVER AREAS THAT HAVE BEEN SUR�ACE
�
ROUGHENED.
� 5. IN NO�E--TtJRF GRASS FINISHED AREAS, SEE�[P€G ANp MUGCHING SHALL TAKE PIACE
� �]IRECTLY OVER SUftFACE RdUGhIENED AR�P,S WITHQUF F7RST SM06THING OUT ThiE SUR�ACE.
3
� 6. IN AREAS NOT SEE�ED AND �1ULCHED AFTER 5tlRFACE ROUGH�NING. SURFACES SHALL BE
RE-ROtJGHENEO AS PfECESSARY TO MAINTAIN GRORVE pEPTH AND SMflOTH OVER RIL�
i
EROSION.
4
(DETNLS AOAATEO FROfA rOWN 0� PARKER, C6LORRBO, liOT AVAILA$LE IN AVTOCAO)
� NOTE: MANY JURSSDICT]ON5 HAVE 8MP DETAILS THAT VARY FftOM 11�FCD STANOARD (�ETAILS.
CON5UL7 WITH I.QCAL Ji1R15DICTlONS AS TO WHICH DETAIL SHOULO BE tJ$Ep 4VHEIV
i qIFF�RENCES ARE NOTEO.
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SR-4 Urhan Drainage and Flood Control District November 2010
Uzban Storm Drainage Criteria Manual Volume 3
Temporary and Permanent Seeding {TS/PSj EC-2
Descrip�ion
Temporary seeding can be used to
stabilize disturbed areas that will be +
inactive for an extended period. ' �_.� �
Permanent seeding should be used tc� - p 4. '� -���` , �
stabilize areas at final grade that will nat ����'�t� , •
be othenvise stabilized. Effective seeding .�!�"� „���
inctudes preparation ofa seedbcd, , �� � `}� .:'�� ��"''��
selection of an appropriatc seed mixture, � . �
proper pianting tech�-►iques, and protectit�n �'�;'� ;!
of the seeded area with mu�ch,geotextiles, ' ��, � __�; ,;,�
or other appropriate measures. ',�:�'� ^ - • ,. "�,';'�'`'--_�' . . � .
w
.�':- _,�• ..
Appropriate U�es ,,- � *�_ . .„�,° �� - � ,� ,�� . : - � .
���':.�.� :-�.� � . .�t � : _ .
When the sail surface is distur�ed and
Photograph TS/PS-1. L'•quipn�ent used to drill seed. Photu courtesy o('
wiIl remaiu inactive for an extended Douslas County.
period(typicalIy 30 days or Ionger), �
proactive stabilizatio�z measures should be i�nplemented. If the inactive periaci is short-lived(on the orde:j-
of t�vn weeks),techniques s�tch as surface roughcnit�g inay he appcopriate. For�ange�pc��ads af
inaetivity,temporary seeding and mulching can providc cffective erosion cocitrol. Permanent seeding
shauld be used on finished areas tiiat f�ave nat been otherwise stavilized.
Typically, local governinents have their own seed mixes and timelines for seedin�. Check jurisciictional
requireinents for seeding and temparary stabilization.
Design and Ins�allation
Effective seeding requires proper seedbed preparation, selection of an appro�riate seed mixture, use of
appropriate seeding ec�uipme�rt to ensure proper cove�'age and density, and protection with mulch or fabric
until �lants are established.
The USDCM VoI�une 2 Revegeration Chapter contains detailed seed mix, soil preparations, and seeding
and mulching rccommendations t11at may be referenced to supplcme�it this Fact Sheet.
Drill seeding is the preferred seeding inethod. Hydroseeding is not recommended exccpt in areas where
steep slopes prevent use of driEl seeding equtpment, and even in these instances it is preferable to hand
seed and mulch. Some jurisdictions da not allow hydroseeding or hydromuiching.
Seedbed .Prepara�ion
Prior to seeding, ensure that areas to be revegetated have
soil conditions capable of supporting vegetation. Overlot Temporary and Permanent Seeding
grading can resutt in ioss of topsoii,resulting in paor quality
subsoils at the graund surface that have low nutrient value, Fune#ions
iittle organic matter conient,few soii microorganisrns, Erasion Control Yes
rooting rest�ictions,and conditions less conducive to Sedi�r►ent Control No
infiltration af precipitation. As a result,it is typically Site�'IWlater�a3 dvlana ement �o
necessary to pravide stockpi.led topsoil,com�ost,or other
June 2012 Urbau Draina�e and Fload Contral I3istrict TS/P5-t
Urban Storm Drainage Criteria Manual Volume 3
EC�2 '�Temporary amd Perr�anent Seeding (TS/PS)
soil amendments and rototill them into th�soil ta a depth of 6 incl�es or more.
Topsoil should l�e saIvageci during grading opez-ations for use and spread on areas ta be revegetated later.
Topsoii shpuld be viewec�as an 3mportant resource to be utilized for vegetation estai�lishment,due to its
water-f�o1c€ing capacity,stizicture, texl�are, organic mattez�content, biologicat activity, ana n�tri�nt content.
The rooting depth of mos�native grasses in tlie semi-arid Den�er nietropolitan area is 6 ta 18 inch�s. At a
n�inimum, the upper 6 inch�s af topsoil should be stripped, stockpiled,and ul�irnately respread across
areas tl�at will be re�egetated.
Where topsoil is not available,sul�soils shoeild bc amended to provide an appropriate plant-grpwth
medium. Organie matter, suc��as well digested compost, can be acicied to irz�prove soif characteristics
conducive to plant growth. Other treatments can be used to adjust soil pH conditions wlien needed. Soil
testing,�vhich is typicaily inexpet�s�ve,shauld b�comp[eted ta deteemine and optimize tkte types and
amounts of amendments tha�a��e�-ec�uired.
; If the disturbed ground surfaee is compaeEed,rip or rototill fhe suiface prior to placing topsoil. If adding
compost to the existing soil surface,rotatilIing zs necessaiy. Surface roughening will assist in placement
of a stable tpPsail layer on ste�p�r slopes,and ailaw inf ltration a�id root penetratinn to greater depth.
:�
; Prior to seeding,the soil stuface should be rough and th�seedbed should be firrn,bt�t neitt�er too laose
�'° nor campactcd. The upper layer of soil shauld be in a condition suitahle for seeding at the proper depth
and conducive to plant growth. Seed-ta-soil contact is the key to good germination.
Seed Mix for Temporae•y Vegetation
t To provide t�mpo��ary vegetati�e cover on disturbed areas r�hich will zao�be�aved,built�poi�,or fiilly
€ Iandscaped ar worked for an extended periad(typically 30 days or more),plant an aninial grass
� ap�ro�riate for the time of plantin�and mulch tl�e pIanted areas. Annuaf grasses suitable for the De��ver
� znctropolitan area are listed in'Fable T5/P5-1. These ar�to be consiclezed only as general
recommendations when specific clesign gnidance for a�articular site is not available. Local go�ernments
typically specify seed mixes appropriate far tl�eir jurisdiction.
, Seed Mi�far Permanent Revegetation
f To provide vegetative ca�er on disturbed areas that hav�reached final grade,a perennial�;rass�nix should
be established. Permanent seeding should be perfoz�ed promptly(typically within 14 days)a��r
reaching final grade. Each site will have different characteristics and a landscape professional or the local
_ jur�sdict�on shouId be contacted to determine tYte most suitable seed mix for a specifc site. In lieu of a
specific recommendation, one of tl3e pere�lnial grass rnixes appropriate for site conditioi3s and growth
season listed in Table TS/PS-2 can be used. The pure live seed(PLS)rates of applicatian recommended
in these tables are cnnsider�d to be absolute mii�imum rates for sced applied using proper drzll-seeding
; equipment.
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If desired for wildlife ha�itat or landscape di�ersity, shrubs such as rubbez•rabbitbzusl�{Chrysothamnus
E raaaiseosass), fourwing saitbush(Aty�iplex canesce��s)and skunkbz-ush sumac (Rhirs tj�iloGatcr)could be
� added to the upland seedmixes at 0.25,0.5 and 1 pound PLS(acra,respectiuely. In riparian zon�s,
� planting root stock of such speczes as American pIum(Prar�zirs ante�•icana),woods rose(.l�osa woodsii),
j plains cot�onwood(Populzrs sarge��tii),and willow(Poparlus spp.}zxiay he considered. On nan-topsoil�d
upland sites, a legume such as Ladak alfalfa at I pound�'LS/acre can be inctuded as a source of nitrogen
for percnnial grasses.
'FS/I'S-2 Urban Drainage and Flond Contzol District .Tune 2012
Urban Stoarm Drainage Criteria Manua[Volurne 3
Temporary and Permanent Seed�ng (�'S/PS) EC�-2
Seeding dates for the higEiest success proba6ility of perennial sp�cies aiang the Front Range are generally
in the spring from April thraugh early May and in tk��fall after the first af 5eptember until the ground
freezes, If the area is irrigated,seediz�g may occur in summer months, as well. See Table TS/PS-3 for
appropz-iate seeding dates.
Table TS/PS-1. Mi�irnum Drill Seeding Rates for Various Temporary Annual Grasses
Pounds af Planting
Species' Growth Pure Live Seed Depth
(Comnr�on name} Season� (PLS)lacre� (inches)
�. Oats Coa! 35-50 1 -2
2. Spring wheat Cool 2S -35 1 -2
3. Spring i�ariey Cool 25 -35 1 -2
4. Annua!ryegrass Cool 10- 15 %a
5. Millet Warm 3 - 15 %z-3/a
6. Sudangrass Warn1 5-1 Q '/a-3/a
' 7. Sorghum War�n 5-10 '/�-3/a
3
8. Winter wheat Cool 20-35 I -2
9. Winter barley Cool 20---35 1 -2
I0. Winter rye COp� 24-35 1 -2
11. 'Friticale Cool 25---40 1 -2
'` Suceessful se�ding of azu�ual grass resulting in adeqtEate plarit growth wilI
= usually produce enough dead-plant residue ta provide protection from
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wind and water erosion for an additional year. This assumes that the caver
is not disturbed or mowed closer ttzan 8 inches.
Hydraulic seeding may be substi€�ited far drilling only where slopes are
steeper�ha�i 3:1 or where access lirnitations existi. When hydraulic
= seeding is used,nyciraulic inutchirtig sl�ould he ap�lied as a separate
= operation,when practical,to prevent the seecis from being encapsulated in
= th�znulcl�.
b S�e Table TS/PS-3 for seeding dates. Irrigation, if consistently applied,
may extend the use of cool season species during the summer znonths.
� Seeding rates should be cioubl�d if seed is broadcast,pr increased by 50
percent if dane using a�riElion Drill or 6y hydraulic seeding.
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June 2012 Url�an Drainage and FIood Cnntrol Dist��ict TS/F5-3
�[lrban Stozxn Drainage Criteria Manual Volume 3
�C-2 'Temporary and Pe�rr�anent Seedi�.g (TS/PS�
Table TS/PS-2. Minimu�n Drill Seeding Rates for Pere�nial Grasses
Common° Botanic�l Gro�vth G�roti��tki Seeds/ Paunds of
Name Narne Seasonu �orm Aovnd PLS/ncre
Alakali Soil Seed Mix
Alkalisacaton 9poroGoltesair•oides Cool Bunch 1,750,D00 0.25
Basin wi[drye �l��u�t�s ci�rer�etrs Coo€ Sunch 1G5,000 2,5
5odar streni��bank wheatgrass Agropj�ro�7 rrpat•iurri Sodar' Coo[ Sod f 7p,OQ0 2.5
Jose tall wheatgrass ,4gropyt�orr elongalutrr'Jose' Coal Bunch 79,pQ� 7,0
Arriba western wheatgrass Rgropyr•ai7 srt�ithri Arr•iva' Caoi Sod 110,aD0 5.5
Total 17.75
i'CrEile LDamy Soi[Seed Mix
��h3'i¢m crested tvheatgrass ��j'°PY�"oir crislahrrn �RpI Sod l75 000 2.0
'Epin'tana` '
Dural hard feseue Festuca ovi�7a'dui•rrrscula' Cool Bunch 565,000 l.0
Lincoln sinouth hroane ��'onrus rneruris leyss �ool Sod 130 000 3.0
'Lincoli�' '
Sodar streaanbank wheatga�ass Agrop�n•on riparitee�t'Sodar' Cool Sod 170,000 2.5
Aiziba weste�•n wheatgrass rigropyron sr�rilhii'�IrriGa' Coo[ Sod S I0,000 7.0
Tvtat 15.5
� H�gh Wa#er Table Soil Seed Mix
� Meldo�v foxtail rflo eczu•rrs iatensis Cool Sod 9q0,000 D.S
�g p I�'
t Redrop r1g,•ostis alba Wann Open sod 5,000,000 0.25
Reed canat'y�'ass Phcrlaris af•erndrnacen Coal Sod G$,0�0 0.5
Lincoln smootli broine Bromirs iner•rnis leyss Cool Sod 130,000 3.Q
'�nzco�n'
Pathfinder switchgrass 1'anicirr�r virgatterit Warm Sod 389 000 I.0
Patl f1�de,.' ,
Alkar tall wheatgrass ��l�PYj���E'�017gAl2f17i Cool Bunch 79,000 5.5
� 'rtlkar•'
� Total 10.75
� Transition Turf Seed Mix`
Ruebens Canadian bluegrass Poa cotrrp�•essa'Rarebelrs' Cool Sod 2,500,000 0.5
E Bural hard fescue Fesheca oi�ina'diu•rusciala' Cool Bunch 565,000 1.0
�
� Citation perennial ryegrass Loliinn pet•enne'Citation' Cool Sod 247,000 3.0
' Lincoln stnooth brome Bromirs i1ae�•rnis leyss c4ol Sod 130,000 3.0
E 'Lincoln'
� Tot�I �.�
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TS/PS-4 Urban Drainage and Flood ConErol District June 2p12
Urban Storm Drainage Criteria Manua[Volum�3
Temporary amd Perr�anen� Seeding (TS/PS) EC-2
Table TSIPS-2. Minimum Drill Seeding Rates for Perennial Grasses(co�t.}
Cammon BoYanical GrowtE� Gro�vtfi Seedsl Pounds of
Nnme Nflme Season�' For►n Pound AL5/�cre
Sandy Sof�Sced vIi�
Bluegiaina Bnulelouagt•acilis ���.�� Sod-fonning 8z5,000 O.S
bunchgrass
Ca�nper litcle bluestem Scl�izachyritttrt scapari�rm WAa.m Bunch 240,000 t,0
'Carrrper
Prairie sandreed Calmrtovilf'a longifolia Wann Open sod 274,000 1.0
Sand dro�seed Spor�obolars c1��pla�ad�tts Cool Bunch 5,298,000 0,25
Vau�hss sideaats grazna Boarteloira caar•trpendirla ��11� � 591,000 2.d
'�augl�fr`
Arriba westein wheatgrass .4gr�op��ran sjnithii:4f•riUa' Cool Sod 110,000 5.5
Total 10.25
�cavy Clay,�2vcky C'oothill Sced�ix
Gphriai�cresYed wheat�rass� '�b'�aAyt�on ct•islatiun �ool Sod 175,00fl 1.5
;� �p{rriart�`
[3
Oahe Intennediate wheatgras5 '���'opyrorr rnlei•nrediaenr Cool Sod l 15,000 5.5
'Oahe'
Batueloua cxrlipe��dula �
Vauglin sideoats grama° 'Yaerglzn' 1�arm Sod 14I,000 2.0
` Lincoln smooth broane 8i'amies inej•mrs Ieyss Coal 5od 130,000 3.0
� � 'LirrcaL�'
� Arriba western wheatgrass ,4gr•opyr•orr sr�ritlaii'Ar�riba' Cool Sod 1 10,000 5.5
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; '�'otal I7.5
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� a Atl of the above seedin�naixes and rates are bascd on drill seedie3g followed by criniped straw inulch, These rates should be
� daubled if seed is broacicast and should be incregsed by SD percent if the seeding is done using a Sriltion Dri�]or is appfied
� Chrough hydraulic seedin�. Hydraulic seeding may be subst€tuted for drilling only�vkiere slopes are steeper tl�an 3:1. If
hydrau[ic seeding is used,ltyd:•aulic mulching s1�ouEd be done as a separate operation.
� e See Table TSIPS-3 for seeding dates.
j ` If site is to 6e irrigated,the transicion ti�F•Fseed rates should be douhled.
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� Crested wf3eltgrass should not be used on slopes steeper than 6H ta 1 V.
� ° Can substitute 0.5 lbs PLS of b[ue graina for the 2.0 Ibs PLS of Vaughn sideoats�r1ma.
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rune 2012 Uxban Dz�ainage and Flood Control District TS/F'S-5
Urban Storm Drainage Criteria Manuai Voiume 3
_
_ _ _ ___ _ __
EC-2 Temporary and Pe�manent Seeding (TS/PS}
Ta�ile TSIPS-3. Seeding Dates for Annual and Perennial Grasses
Annual Grasses �'erennial Grasses
(\'umhers in tablc reFea•ence
species in Ts�61e TS/PS-1)
Seeding Dates Warm Cool War•�n Caal
January 1—March 15 ✓ ✓
March 16—Apri136 4 1,2,3 ✓ ✓
May I—May iS 4 ✓
May 16—June 30 4,5,6,7
July 1 July 15 5,6,7
Juiy 16—August 31
3
Sept�rc-�ber 1—September 30 8,9,10,11
Octaber 1—DecemUer 31 ✓ ✓
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Mulch
Cov�r seeded areas with inuLch ar an appropriate rolled erosipn coi3trol product fo promote establishment
of vegetafion. Ancllor tnulch by crimping,netting oz use of a non-toxic tackifier. See the Mulching BMP
Fact Sheet for additional guidance.
� Ma�ntenance and Remova�
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� Monitpr and observe seeded areas to identi�'y areas of poor g��owtli or areas tl�at fail to germinate. Reseed
� and anulc��th�se areas,as needed.
An area tl�at has been per�nai�ently seeded should have a good s�and af v�getation witlxin one g�owing
season if irrigated and within three growing seasnns witl�out iz-rigation in Coloz�ado. Reseed portions of
the sit�tlxafi fail to gemunate or remain bare after the�rst growing season.
5eeded areas may require irrigation,particularly during extended dry periods. Targeted weed contrpl may
also be necessary.
� Protect seeded ar�as from construction ec�uipinent and veliicle access.
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TSII["S-6 Urban Dzainag�and Fiood Control District June 2012
Urhan Storm Drainage Criteria Manual Vol�me 3
Mulching (MU) EC-4
Description �"� �`:F,r ��� � "��"� ,��„� --�-�
�� ' �:.�``�' �� _: �: z�.,
. .��. „x ,� _ ^� .� . �. �,,-.;
� ' ���P..sV ��_� *{„'4"yf f r'�lt �M.yn�,. ��¢{;� �� ,
Mulching consists of evenly applying ��, 1 .•' � . , + �'p1�" �<. , � �- ,�
_�.�'� h 'Nr ' �� � _;.� ���' � �h�"�, I�t ��t..
straw,hay, shredded wood mulch, rock, �i ��'�� r7 s.�sy e •* f.✓ �r �'i �" �R�.� .
bark or com ost to disturhed soils and " ��'` "�� ��� p �`s�^� .��q� + ; x y+
p a k �,� 7+� .yw �lR;.
SCCLII'lllg fY1C IT1U�C�1 by CCIITlIJlilg,YSCIC1Fle1'S, x �kw� t '�� � ' ' '' ,`��� � �"� t� :.y� ' y ��T"e
netting or other rrieasures. Mulching hclps # ',,� f�� "�, � . � '�,.,, �,� ���i • ` :°�'�
� � - I ra �y.��' 6 �' �Sh y�.•��
�� r+ ' , 1'titir. X, ��� >i' ,��� y
reduce erosion by protecting bare soil �{ �� , � � .,,� .� !;}�.� �,� ��=
'E����'.. ` � � tR' ,� t - �!' y�1 F� d�L tM k .4 4,, �
from rainfall impact increasing � '+K 'r `+ �c�.'� . ' ,� j �� �''•+��:+�� f ,�,
i�7filtration, and reducing runoff. �5+�'� `�����':�r4:.'�` ��la;'.'�''�i��! �3��`��r';��:�n�,r�`-+�+b��.�
Although often applied in conjunction , �4�` ;�; +�� ,'''�r�r,��"(�' '�, �� �� �`!�"; �''-;���-
¢ k-�k� u��:'e � '' '"�` E`� � � �� r'` '�E �"y' �
with temparary or perrr►anent seeding, it � � ,��,,,� 4 ��►;� : „�� ��:..��:,;, k�+� ; , �,��
� � 1 ,�r :. �r 'r.. o� � R '��`��•:i
can also bc used for temporary �'�'i " �� � ,� r, ,. �r,,f 0. ��•r„�,� �. r�,����;
R � �s� a r ,..�'
stabilization of areas thaE cannot be �rY :, ���i i��I ,,'; .+ '.`.����-�� ' ' •,t -�,,�"�,� �_:,�*
rescedcd due to seasonal constraints. � �i' r1'�,'�:t ' ;n.� �.,., ��ry'.� �:�'ra" `� � � � .,�
y���'�ff- -��4 '�N;�� ��.t:7�'���'�w!'+�,�4��� ������ ',�:. �r�
Mulch can be applied cither using ` `;�:'`��if..t,,s fr ti� r ����v`��-•'k#��,'�;�,� ��..::R�
standard mechanical dry application �` ���� �`' '�,���"��� !�?�" '���'P3�''�
methods or using hydromulching ec�uipment photograph 1V1U-1. An area that was rccently seeded,mulched,
that hydrauliealiy applies a slurry of water, and crimped. '
wnod fiber mulch,and often a tacicifier.
Appropriate Uses
Use mulch in conjunction with seeding to heip protect the seedbed aEid stabilize the soi�. Mulch can also
be used as a ternporary cover oi1 iow to mild slopcs to help temporarily stabilize disturbed areas where
growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and
tacked,or seeded,mulched and tacked gromptly after fina[grade as reached(typically within no longer
than 14 days}on portions of tY�e site not otherwasE permanently stabilized.
Standard dry mulching is encouraged in most jurisdictions;however, hydromulching may not be allowed
in certain jurisdictions or may not be alIowed near waterways.
Do not apply�nulch during windy conditians.
Design and Installation
Prior to mulching, surface-roughen areas by rolling with a crianping or punching type roller or by track
walking. Track walking should only be used where other methods are impractical because track walking
with heavy equipment typically eorrtpacts the soil.
A variety of mulches can be used effective[y at construction
sites. Consider the follawing:
Mulch
Functions
Erosion Control Yes
Sediment Control Moderate
Site/Materiai Mana ement No
June 2012 Urban Drainage and Flood Control District MU-1
Urban Storm Drainage Criteria Manual Volume 3
EC-4 Mulching {MU)
■ Clean,weed-free and seed-free cereal grain straw shauId be applied evenIy at a rate of 2 tons per acre and
must be tacked or fastened by a method suitabie foc the condition of the site. S�raw mulch must be
ancl�ored{and not merely placed}on the sur#`ace. This can be accomplished mechanically by crimping or
with the aid of�ackifiers or nets. Anchoring with a crimping implement is pzeferred,and is the
recommended method for areas flatter tharz 3:1. Mechanical crimpers must be capable of tucking the long
m�lch fibers into the soil to a depth of 3 3nches without cutting them. An agricultural disk,whil�not an
ideai substitute,rnay wark if the disk blades are duII or blunted and set verticalIy;however,the frame may
have to be weighted to affard proper soil penetration.
• Grass hay may be used in plaee of straw;howe�er,hecause hay is comprised of the entire plant including
seed,mulching with hay�nay s�ed�he site with nan-native grass sp�cies which might in turz�out-compete
the native seed. AIternatively,native species of grass hay znay be purchased,but can be difficult to fnd
and are more expensive than straw. Purchasing and utilizing a certified weed-free straw is an easier and
� less cns�ly mulching method. When using grass hay,fallow the same guidelines as�or straw(provided
abov�).
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■ On small areas shettiered from Y1ie wind and heavy zunoff,spraying a tackifier on the mulch is satisfactory
for holding it in pIace. �'nr steep slop�s and special situations where greater control is needed,�roszon
' control blankets anchored with stakes should be used instead af mulch.
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� ■ Hydraulic mulching consists of woad ceilulose fibers mixed with water and a tackifying agent and should
be applied at a rate oFnp less than 1,500 pounds per acre(1,425 Ibs of fib�rs mixed with at least 75 lbs of
tackifier)with a hydrauiic muIcher. �ar steeper slopes,up to 2000 pounds per acre may be requ�red for
effective hydroseeding. Hydromulch typically rec�uir�s up to 24 hours to dry;therefore,it should not be
appIied immediateIy prioz to incl�zr�ent weather. Application to roads,waterways and existing vegetation
k should be avoided.
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� ■ Erosion control mats,blank�Ys,or nets are recommended to help stabilize steep sIopes(gencrally 3:1 anct
steeper)and waterways. Depending on the pzoduct,these may be used alone or in conjunction with grass
or straw mulch. Noarmally,use ofthese products will be r�stricYed to relati�ely snraall areas.
Biociegradable mats made of straw a�d jute,straw-coconut,coconut�ber,or excelsior can be used instead
of mulch. (See the ECMITRM BMP foz-imore infarmatian.)
• Some tackifiers or binders may he used to anchor muIch. Check with the local jurisdiction for allowed
tackifiers. Manufacturer's recommendations should be followed at all times. (See the Soil Bind�r BMP
for more inforrnatinn on general types of tackifiers.)
• Rock can also be used as mulch. It provides protection of exposed spiIs to wind and water erosion and
allows infltration of precipitation. An aggregate base course can be sparead on disturbed areas far
ternporary or perman�nt stabilizafian. The rock mulch layer shauld Ue#hick enaugh to provide firll
coverage n�exposed soil on th�area it is applied.
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j Maintenance and R�moval
After mulching,#he 6are ground surface should not b�rzaore than 10 percent exposed. Reapply mulch,as
needed,ta covez bare areas.
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MU-2 Urban Drainage and Flood Contral District June 2012
Urban Storm Drainage Criteria Manual Volume 3
Temporary Outlet Protec�ion �TOP) EC-8
Description � ti •»,-:�`�,,�`'__, _.•��..o.-=. .��.
� � '' � `� =J ��
Outlet protec#ion heips to reduce erosion `:�r�- '' . ��� �= =�-
immediately downstream of a i e '���4� `�� �'i` � ��"�a:.
P P , --�. ��-.. �
culvert,slope drain, rundown or other � , , ;_.�_ � `� � �:�`�;:���
�+` ,."�
conveyance with concentrated,high- `�.�-�`"''� �.��f r �_,�, 'y
veloeity flows. Typical outlet protection � w ��'�-'�--V�•� - � '�
� � � �-..
consists of riprap ar rock aprons at the �� " _ _ . r,,._ ; ' ,�.,:-„
conveyance autlet. �r .���''r '!�'�""` �:�,_'���-r � V �A'��
��,,� ' ;"" ' ..f�-. A��, - �r�,M'�
,�'1�_ �� , - .,;,;;,�: „
Appropriate Uses _ � � ��=�r,�;:_� ���� _ ., �:_.-...�
� :�, ��-.. :�;,,,r -4 �- ��,"�
Outict protection should be used when a � ��`.'"`� �`� •' ,,,�, °" �,�
::':�'. ..... 1► . �aT �'%`�'
conveyance discharges onto a disturbcd
arca where�here is potential for accelerated Photograph TOP-1. Riprap outlei pro�ecti�n.
erpsipn due Eo cpncentrated flow. Outlet
protection should be provided where the velocity at rhe culvert outlet exceeds the maximum perraissible
velocity of the material in the recerving channel.
Nate: This Fact Sheet and detail are for temparary outlet protection, outlets that are intended to be used
for less than 2 years. For pern3anent, long-term outlet protection, see the Major Drainage chapter of
Volume i.
Design and Installation
Design autlet protcction to handle runoff from the largest drainage area that may be contributing runoff
during construction(the drainage area may change as a result of grading). Key in rack, around the entire
perimeter of the apron,to a minimum depth of 6 inches for stability. Extend riprap to the height of t11e
culvert or the norn�al flow depth of the downstream channel, whichever is less. Additianal erosion
control measures such as vegetative lining,turf reinforcerncnt rnat and/or other channel lining methods
may be required downstream of the aut[et protection if the channel is susceptible to erosion. See Design
Detail OP-1 for additional information.
Maintenance and Removal
Inspect apron for damage and displaced rocks. If roeks are missing or significantty displaced,rcpair or
replace as necessary. If rocks are continuausly missing oz'displaced,consider increasing the size of the
riprap or deeper keying of the perimeter.
Remove sediment accumulated at the outlet before the outlet protection becomes buried and ineffective.
When sediment accumulation is nated,check that upgradient BMPs, including inlet protection,are in
effective operating condition.
Outlet Protection
Outlet protection may be retnoved once the pipe fs no longer
draining an upstream area, or once the dawnstrearn area has ���etions
been sufficiently stabilized. If the drainage pipe is Erosion Control Yes
permanent, outlet protection can be left in place; however, Sediment Control Moderate
permanent outlet protec#ion should be designed and Site/Matenal Mana e�nent No
constructed in accordance with the rec�uirements of the
Major Drainage chapter of Volume 2.
November 2010 Urban Drainage and Flood Con#rol District TOP-1
Urban Storm Drainage Criteria Manual Volume 3
Temporary Qutiet Protect�on {T�P) EC-S
�EtviPORARY OUTLE3„PROTECT,I�N,.,,]�fi�R�„�A71(]N NC]TFS
#. SEE PLAN VIEW FOR
—LOCATION OF OUTLE7" PROTEC710N.
—DIMEN5€ON5 OF" OUTI.ET PROTECTION.
Z. DETAIL 15 INTENaED FOR PIP�5 Wf7H SLQpE 5_ 10�. ADpITIONAt EVALUATION OF RIPft�P
S[ZII�G AND OUTtET PROTECTION QIM�NSIQNS REQU€RED FOR STEEPER SLOPES.
3. TEMPQRARY OUT�ET PR4TECTION INFORhdAT10N [S FOR OUTLETS ItJT�N6Eq Tp 8E UTILEZED
LESS THAN 2 YEARS.
TERAPOf2ARY QllTLET PRpiECTfON INSP�CTION AND MA1N7ElVRNCE NO7ES
1. INSPECT BMPs EACH WORKQAY. AND MAIN7AiN THEh,S IN EFFECTIVE OAEF2ATING CONDITION.
; MAINTENANC� QF BMPs SHOULO 8E PROACTIVE, NQT REACTIVE. I3J5PECT BMPs AS SO�N AS
' POSSIHLE (AND ALWAYS W]TH1N 24 H�URS) FOLLOWING A STORM �HAT CAUSES SUR�"ACE
� �RpSION, ANp PERFOR�1 NECESSARY hiAINTEIVANCE.
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2. FRE4llENT 085ERVATIONS AND NtAiNTEI�ANC� AR� N�C�SSARY TC1 �1AINTAIN BMPs IN
EFFECTIVE OAERA7ING CON�it"ION, INSPECT€QNS ANp CORRECTIVE MEA5URES SHOULD 8E
OOCUMENTED THOROl3GHLY.
3. NlHERE BMPs HAV£ FAIL��, REPA[R ffR REPI.ACEMfENT SHOl1LD BE IN1TfATED UPOtV
DISCOVERY OF THE F'AILiJR�.
� NOTE; hiANY Jl1RISDICTi�NS HAVE B�1P ��TAILS THAT VqRY FRQM 3JDFC� STAN�AR� OETAl�S.
" CONSIiLT SHITH L4CAL JURISpfCI'14NS AS TO YJHICH DETAlL SN£IULD BE USED WNEN
� �IFFERENCES ARE NDT�G3.
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{DEfAELS AQAPIE6 fROM AURORA, COLORAgO AH� AREVi0l15 +1ER516N OF VOiU1AE 3, NpC AVAtl.ABI.E 1N AUT9CAC1)
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November 2010 Urban Drainage and Flaod Control District TOP-3
Urban Storm Drainage Criteria Manuat Voluz�c�e 3
Wind ErosionfDust Control {DC) EC-14
. .._ _ .� . ..,
Description '
Wind erosion and dust control BMPs wr�r ��R
help to �Ceep soil particles from entering ��' � � ��.`��'`-t; � "+�"�
the air as a result of land d�sturbing ''� � `A�'+� ��� ���-��•
construction aetivities. These BMPs � ��.:;;_' -
�. =�-:�. ;,�
include a variety of practices g�neraily � -.;�'_��-- .,
focused on either graded disturhed areas � T
or coc�struction roadways. For graded ���
I areas,practices such as seeding and . ,
�-
i t�
mulehing, use of soil binders, site :'•ti - - �� :
� �" ' '
watering,or other practices that provide ' � " �` �►�
.•- r '4:,.� a.�, �•.
prompt surface cover should be used. � � '
, � ` R,�, ; ,;� �„°
For co�7struction roadways,rnad `I- ., �:;;, A : ..;'r�' y ;�' s.,-� '�:
watering and stabilized surfaces should , ?=,` ti.�.� 1_ .�#`������r'��..ar:
be GOri51dEiBd. Photograph DC-l. Water truck ased for dusI suppression. Photo
courtesy of Douglas County.
Appropriate Uses
De�st control measures should be used on any site where dust pases a problem to air quality. Dust control
is impartant to control for the health of construction workers and surrounding waterbodies.
Design and Yns#ai�ation
The following canstruction BMPs can bc used for dust controL
• An irx-igation/sprinkler system can be used to wet the top layer of disturbed soil to help keep dry soil
parEicles from becorr�ing airborne.
■ Seeding and rnulching can be used to stabilize disturbed surfaces and reduce dust emissions.
■ Protecting existing vegetation can help to slow wfnd velocities across the ground surface,thereby
limiting the likelihood of soil particles to become aizborne.
■ Spray-on soil binders form a bond beriveen soil particles keeping them groundcd. Chemical
treatments rnay require additional permitting requirements. Potentia9 inr�pacts to surrounding
waterways and habitat must be considered prior to use.
■ Placing rock on construction roadways and entrances wil!help keep dust to a minimum across the
construction site.
■ Wind fences can be installed on site to reduce wind
speeds. Install fences pe�pendicular to the prevailing Wind Erosion Control/
wind direction for maximum effectiveness. Dust Contro#
Fu�ctions
Maintenance and Removal Erosion Control Yes
When using an irrigation/sprinkler control system to aid in Sediment Control No
dust control,be careful not ta overwater. Overwatcring will Site/Material Mana em€nt Moderate
cause canstruction vehicles to track mud off-site.
November 2010 Urban Drainage and Flood Control District DC-1
Urban Storm Drainage Criteria Manual Volume 3
Concrete Washout Area (CWA) MM-1
Description
Concrete waste management involves
designating and properly managing a
specif c area of the construction site as a
conerete washout area. A concrete
washout area can be created using one of - _ � ;
several approacl�es designed to receive ' I �� `�"� : � �=-�
wash water from washin of tools and � � � �'� ��
g ��--� .
—�. -.�.:__ � � f' ,,�
conerete mixer chutes, liquid concretc � ,��:�?
waste frora durnp trucks,mobile batch " '�% �; �
: .u�.:,� .
mixers,or pump trucks. Three basic ���' , •
�
approachcs are available: excavacion of a �* "`�y `''�=�� ` �� . . �''� -
pit in the�round,usc ofan above grounci �'
�
storage area, or use of prefa�ricated haul- ��s � n1���' �,; ���'�'��j���� - „
k ^;^F��,ti � sr� . 4 .�'� � -'�"`
away concrete washout containers. � ✓��.� �r % � r-�� f ''; �1�}T
.....x'�.�a.•:�.c�,�,.' �� i° �; '�, �'�+".� ';�
Surface discharges oF concrete washout • "`"` � -'"��� ''"�='' . "
water Fram constructian sites are prohibited. Photograph CWA-1. Exampia ofconcze�e w�sl�ou�a�-ea, Notc gravcl
tracking pad for access and si�n.
Appropriate Us�s
Concrete washoe�t areas must be designated on al1 sites that will generate concrete wash water or liqui�
concrete waste from onsite concrete mixing or concretc delivery.
Because pH is a pollutant af concern fnr washout activities, whcn unlined pits are used for concrete
washout,ti�e soil must have adequatc buffez'irag capacity to result in protection of state groundwater
standards; otherwise, a liner/containment must hc used. The following managennent practices are
recommended to prevent an impact frorn unlined pits ta groundwater:
■ The use of the washout site should be temporary{less than 1 year),and
■ The washout site should be not be�ocated in an area where shallow groundwater may be present,such
as ncar natural drainages,springs,or wetlands.
Design and Installation
Concrete washout activities must be conducted in a manner that does not contribute pollutants to surface
waters or stormwater runoff. Concrete washaut areas may bc lined or unlined exca�ated pits in the
ground,commercially manufactured prefahricated washout containers,or aboveground hoiding areas
constructeci of berms,sandbags or straw hales with a plastic iiner.
Although unlined washout areas may be used, lined pits may be required to protect groundwater under
certain conditions.
Concrete Washout Area
Do not locate an unlined washo�t area within 40U feet Funct'rons
4f any nat�ral drainage pathway or waterbody or �rosion Control No
wfthin 1,000 feet of a�y wells or drinking water
sources. E�en#`or lined concrete washouts,it is Sediment Control No
advisable to locate the facility away from waterbodies Site/Material Mana ement Yes
and drainage paths. If site constrainis make these
November 2010 Urban Drainage and Flood Contro3 District CWA-1
Urban Storm Drainage Criteria Manual Volurne 3
MM-1 Concrete Washou� Area (CWA)
setbacks infeasible or if 3�ighly permeable soils exist in the area,then the pit fnust be instailed wich an
irrtpermeable liner(IG mil minimum thic3cness)or surtace starage alternatives using prefabricated
concrete waskaout dev�ces or a lined aboveground storage area should be used.
Design details with notes are provic€ed in Detail CWA-1 for pits and CWA-2 far aboveground storage
areas. Pr�-fabricated conerete washout container information can be obtaincd fram vendors.
Main�enance and Removal
A key consideration for cancrete washout areas is to ensure that adequate signage is in place identifying
the location of the washout area. Part of inspecting and maintaining washout areas is ensuring that
adequate signage is provided and in good repair and that the washout area is bcing used,as opposed to
washout in non-designated areas of the site.
Remove concrete waste in the washout area, as needed to maintain BMP function (typically when tilled to
abouc two-thirds of its capacity}. Collect concrete waste and deliver offsite to a designiated disposal
locatian.
Upon termination of use of the washout sitc,accumulated solid waste, inc[uding concrete waste an�any
contaminated soils,znust be removed from the site to prevent on-site dispasa�of solid waste. If the wash
water is allowed to evaporate and the concrete hardens,it may be recycled.
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t tii• .._.� ,r1�1� ;�:' 4 s N'ASN��IUi - M -.� _ � , .. .
r�"�` �� 7f'•7 � w� ''�. ! '�r� "`�
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. -n� . . - � ��:, - .3�•�'"� .t � . . .. ' . " � ��
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�'��r^r� ' . Ir'���w' ,�,..♦ ��.�!I'�,- � � • � ti�:s '1'�'�'�
.i�.. N- .. d�V;iY'sn.�S":�� ..d'�":�.. . ..u- ."�z sICY. . .." __
Photograph CWA-2. Prefabricated concrete washout. Photo Photograph CWA-3. Earthen concrete washout. Photo
conrtesy of CDOT. courtesy of CDOT.
CWA-2 Urban Drainage and Flood Control District November 2010
Urban Storrr►Drainage Criterta Maraual Volume 3
Concrete Washout Area {CWA) MM-1
CONCRETE WASHQl3T
a A �SIGf�
:�;� �?����.'�.��3<��.�: � VVf-1
3:1 ,°r.� A31N �-FS-�`�s��-�������r
��.�,�,,�,,��-�.����rs��S..��
��,��"���j'��,�,'T�.�'�����"'� '
�-��'�`-�t i��,��'���:��%F 3
��'°�������'������: VEHICLE TRACICING
3:i $ x 8 Mttd. � � ����,���-�y���r��'"��t�� C{}NTROL (SEE
�,"�•-s��%-s�� ;����-��-���, VTC t3ETAi�) QR
�,�,��'�'���=� �-.�-;; OTHER Si'ABLE
�.��-��°,,�'hs���� �-�-`���F., SURFACE
�;�"..��;:��,C�;�,�����r`
'.�,awY�-s�;'-r���,�,:�:��°�a f.:�;:°�<-n.,�C
3:1 �����'�l��..�,��;Y���`
�=���;�r�,����.;�r-���,:��7`�;F
_
� 25 MIN.
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CONCRETE WASHOUT AREA PLAN
12" TYP. � COMFAC7En B�RM AF20UND
>4 1"H� P�RI�IETER
�� 2� SLOPE
a . .. ,�"` 1� ^�3' MIN. —�1 ,.,
" 11NdISTURBE� dR� ?3 >3
�£ COMPACTED SQIL V�HICL� TRACKING
8 X 8 MIN. CONTRdL (SEE VTC
� SECTION A DETAIL �
CWA-1 . CONCRETE WASHOUT AR�A
CWA lNS7RLLA710N NOTES
1. SEE PIAN VIEN+ FOR:
� —CWA INSFALLATIC3N LOCATION.
i 2. DO NOT LOCATE AN UNLINED CVJA WITHEN 400' OF ANY IdATLiRAL ORAINAGE PATNWAY OR
j V1ATEft8f1DY. DD NOT LOCATE VJ�THIN 1,(3�0` OF ANY WEL�S OR DR[�SKING WAT�R 50liRCES, I�'
SITE C�NSTRAINTS 3�AKE TFilS INFEASIBLE, OR IF FiiGHLY PERMEABL£ SQI1.S EXIST QN SITE,
= THE Cl^1R MU5T B£ INSTALLED WITH AN IMPERMEABLE LINER (1B ht[L �41N. THICKNESS) OR
SURFACE STQRAGE ALTERNA�IVES U51NG PREFABRICATE� C�NCR�I'� WASHQUT D�VICES OR A
L1NED ,480VE GROUN� 5TORAGE ARE SHOULn HE US�D.
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; 3. THE C6VA Sh1ALL BE INSTALLED PRIt3R �0 CONCRET� PLACEM�NT ON SITE.
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E 4. CWA SFiALt INCLUOE A FI.A� SUBSURFACE PIT TFtAT 15 AT LEAST 8` BY 8' SLOPE5
E LEA�ING OUT OF THE SUBSURFACE AIT SHALL 8E 3:1 OR FIATTER. THE PIT SHALL BE AT
` LEAS'f 3' �E�P.
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5. BERM SIIRRffUNQWG StQES AN� BACK Q� THE CV��A SNALL HAVE M1NIt�UM HEtGHT OF 1'.
€ 6. VEF3ICLE TRACKtNG PA(l SHAE.L BE S�OPEQ 2� 70WARDS 1'M� CwA.
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; 7. 5lGI�S SHALL 8E PLACEI] AT T"H� CON5l"RUCTiQN ENTftAI�GE, AT THE CWA, ANO
[ ELSEWH�RE AS NECESSRRY TO CLEARLY IND]CATE iHE L�CAT10td OF" TH� CWA FQ OPERATQRS
� Of CONCRETE TRUC{<5 ANO PU�RP ftiG5.
E 8. U5E EKCAVATED �tATER1AL FOR PERIMETER BERM COfJSTRUCTION.
November 24i0 Urban Drainage and Flood Control District CWA-3
Urban Stprm Drainage Criteria Manual Volume 3
MM-1 Concrete Washout Area (CWA)
CWA MAINTENANCE NOTFS
1. INSPECT BMPs EACH WORKDAY, APlD MAtN7AiN THEM iRE EFFECTlVE QPERATING C0�€L31T[ON.
MAINTENANCE OF BMPs SHOiJLf3 BE PROAC?'IVE, NOT REACT3VE. INSPEC€ BMPs AS 540N AS
POSSIBLE (AN� ALWRYS INITH[N 24 HOUR5) FDLLOWING A STQRhd THRT CAUSES SURFACE
ERQSION, AND PERFOftM NECES5ARY MA€N�EMANCE.
2. FREQUE3VT 08SERVATtaNS AND MAINT£NANCE ARE NECESSARY r0 MAINTAIN $A4Ps [N
EFFECTIVE QPERATING C4M1fDITION. INSPECTIONS AND CORREC'fIVE hS�ASURES SHQtJl.D BE
nOCUMENTED TMOROUGHLY.
3. VJHERE B�,�Ps HAVE FAILEO, REPAIR OR REPLACEf�ENT SHOULD 8� tNITIA'fED UPON
(71SCOVERY dF THE FAILURE,
4. THE G1NA SHALL E�E REPAIREO, CLE,ANED, OR ENIARGE� AS NECES5ARY TO MAIRt€AIi�
CP,PACITY FOR CflNGRETE WASTE. CONCRETE MATERIAL5, ACCUMULATER IN PIT, SHALL 8E
REMOVED flNCE THE MATERtALS HAV� REACHEp A pEPTH OF 2'.
5. CONCRE7E INASHOUT WATER, WFl5TE� PIEC�S OF CC3NCRETE AN� ALL QTHER D�BRiS
IN THE SU85URFACE PIT SHALL SE TRANSPQR7ED FR4h4 THE JO8 S[TE lN A 1NATER--TIGHT
C0�€TAINEft AND DISPt35Ei� OF PROPERLY.
� 6. THE CVJA SHALL REh1A4N IN PI.ACE UNTlL. ALL CONCRETE FOR �ME PROJECT 15 PLACE�.
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7. wF3�N TH� Cvdp 1S REMOVE€�, C�VER THE DtSTl1R8E� AREA WITH TOP 501L, 5EE� ANQ
MULCH OR OTHERWISE STABILIZED IN A MAtJNER APPRpVEp BY THE LOCAL Jl1RISDICT30A'.
(OETFl4 FDFPTED FR4FA ppUGLAS COt1NTY, COLdF2A00 RFID TNE CITY OF PARS(ER, COLORR00, tdOT AVA1L48LE IN AUTOCFD).
NOTE; MANY JURISDICTIONS IiAVE BMP OETAILS THAT VARY FRpM llp�CD SrANpARD DETA2LS.
CONS[!LT Ydl'€H LOCAL JUR15D3C11f1NS AS TO WF31CH DE�'A[L, SHQULD BE USEO WNEN
pIFFERENCES ARE NOTE�.
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i CWA-4 Urban Urainage and�'lood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Stockpile Management {SP) MM-2
� .
Description ,;. -:'''�� �'���
..�. �. k �r�
A�w�. .; • ,y.���rA�Js�' "'; ���`����Erl�e�-' �.aa ��r �` ��'-�''
Stockpile management inciudes s,,s.�.� �"`��.._ ,,_ ��; '_ �c � �,,4 •
measures ta minimize erosion and �• �� �,?a•-� �a�- .'"�
sedirrtent trar�s o�t from sai.l stack i.les. , � �� _ ' �`
,t. ��.. .�.-. � - ....
P P . �i1� �' � �. -;:�~�,
_ . �S�-= `��` ' µ��.,;.;�
Appropriate Uses R "` -y �� '� ��
� ..�
s .r, �� � �
��"`'�~�=� -�`'� i� ;,� <�'
•���
�tockpile managemeni s�ould be used ; ,,;,;.'' -.,,,�_ •. "�^� '�`�`+�,� '',�
� ; . •� ,'''�.
whera soids or otl�er erodible materials f � ,.r , " _ '�. • . � L .;,� _`-�`'�- -��. ..,-=,,,w, �'�
are stored at the co�istruction site. , v l , - �ti �' ="' _4 y� `�''`
p �-_'
.���.a �- . - �
Speciat attention should be gi�en to �.- -�-� ��. -- "^`� ' �` `�;�*' `�t��
S�OC�C�I�CS lII CIOSe pI'OX1Irilty t0 ttc9.tlllc't� rs A✓�� `�_ .w -'•, ��•� •� �=�rs;��-}'=�, , '�•`- �u~ •,�,
�' �'vr � �� ..." `ti,r._ ��.
or manmade storm systems.
Photograpli SP-1. A topsoil stockpile that has been partially
revegctated and is proFected by sih fence perimeter conti�bi.
Design and Installation
Locate stockpiles away from all drainage systcm components including storm sewer inlets. Where
practical, cYsoosc stockpile locations tliat that will reinain undisttn•bed for the longest period of time as the
phases nf construction progress. Pl�ice sediment control BMPs around tlze perimete��ofthe stocicpilc, such
as sediment control logs,rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for�uidance
on pro�er establishment of perimeter controls araund a stockpile. Foa•stockpilcs in active use,provide a
stabilized designated access point on the upgradieni side of the stockpile.
Stabilize the stockpile surface with surface roughenang, teznporary seeding and 3rnilching,erosion contro]
blankets,or soil binders. Sails stockpiled for�n extended period(typically for more than 60 days)should
he seeded and mulched with a temporary grass covcr once the stockpile is placed(typically within 14
days). Use of mulch anly or a soil binder is acceptable if tkle stockpile will be in place for a nnore limited
time period(typical�y 30-b0 aays). Timeframes for stabilization of stockpiles noted in this fact shcet are
"typical" guideliiies. Check pennit requirements for specific federal, state, andlor local requirements that
�nay be more piescriptive.
Stockpiles should not be placed in streets or paved areas unless no other practicaf altcinative exists. See
the Stabilized Staging Area Fact Sheet for guidance when staging�i1 rnadways is unavoidable due to
space or right-of-way constraints. Far paved areas,rack socks must be used�o��perianeter control and all
inlets witla the potential to receivc sedirncnt from the stockpile(even from vehicle tracking)must be
protected.
Ma�ntenance and Remova�
Inspect perimcter controls and in[et protection in accordance witl��heir respective BMP Fact Sheets.
Where seec�ing, mulch and/or soil bin.ders are used, reseedin�or reapplication of soil binder may be
necessary.
Wheu temporary removal of a perimeter BMP is necess�ry Stock ile Mana ement
to access a stockpile,ensure BMPs are�einstalled in F�nc€ions
accordance with their respective design dctai�section. Erosion Control Yes
Sediment Control Yes
SiteCMateria[Mana emenE Yes
Navember 2010 Urban Draina�e and Flc�od Canlzol District SP-j
Urban Storrn Drainage Criteria Manual Volutne 3
l�M-2 Stockpile 1Vlanagement (SM)
When tiie stockpile is no longer needed,properly dispose of excess materials and revegetate or atherwise
stabilize the ground surface wliere the stockpile was locat�d.
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SP-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criterta Manual Volume 3
Stockpi�e Management {SP) MM-2
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SP- 1 . STOCKPILE PROTECTl4N
STOCKPti�.� PR�TECT�t3f� tihST�,L "T10�I �4TES
1. 5EE !'I_rIN VIEW FOP.:
-LOC.CTi�N OF STO�Kf°9LE5.
-TYPE �F STOCKPILE PROTECT3Qi�.
2. IM1lST.�L PER1MEi£R CONTRrJ�$ I�l ACCdRDa.�vCE 1�'�6TH L4iEIR RE5PECTIVE QE51GN D�TAiLS.
S�LT f ENCE �.S S!-t�4l�i ;s•1 TriE 5T4JCKP'�LE P�P�ITECTi�^l €l�TASLS; Flb':'�EV£4?, 9THEP. TYPE5 0�
PEREt�dETEft CDNTROLS li`�CL�JGING SEDII+�1ENi C(7NTROL �OGS �R R�CK SOCKS MAY BE
S�!iTABLE IN SOME CIRCUNl5T'ANCES. COIvS�❑EF2A71DN5 FGP, €]ETER�:1lNIlVG THE APPR�PRiATE
TYf�E OF PERIAAET�R CGr9iROL FCfR A S��CKPI�E IMCLI�pE '�Srk��TNE�' THE STOCKPILE 15
LOCATEp ON A PERVIOUS OR It,�PERVIOLJS 5[JR�ACE, �HE RELRTIVE HE[GHTS DF THE
PERiMETER CONTR£?L AN� 57�CKPfLE, THE A$ILiTY QF TiiE PERIMEFER CbNFP.OL TQ CONFAfN
THE STpCKPILE WITHpU7 FAILENG I1V THE EuENT THAT M�M1TERf.�L FF70M T3i� 5rOCkSPi�E SHI�'FS
❑R SLUMP� Arpant5r THE FEP,4hAETER, Pf�D �T�sER FAf„T�gS.
3 STA91LiZE THE STO�KPlLE SURFACE WIiH SlJF2FACE ROLIGHENiNG, tEhIP{3RAFiY �EEOING AN�
MULCFVIN,, ER�SIQN CpMTROL 8t1+t�KETS, OR SOIL 81P�[�ERS. 503L5 STDCKPIL"c0 FOR AN
£XTENOEn PER141] (TYF'ICALLY FOR FAORE THAN 60 OAY$} SHQt1Lp BE SEEqEa ANO M13LCHEQ
WITH A TEIs�PORARY GRliSS CQ�lEP, (}[JCE THE STOCKPI�.E 15 PLACE� (TYPICALLY Wi�HIN 14
DRYS). 1lSE OF AIVLCH �iNL`� OE� A 4�1� @1NDER IS i.CCEf'�ABLE !F Tk+E S7DCKP1� 11ILL BE
iN PLACE Fpi'< A tv1Dt2L LttvlITED i1r�lE PER1Gf1 (7vPICALLY 3�i-6t? DA'fSj.
4 FOR T�MPORARY STQCKPILES {3N lHE I!�}TERIOR POR�"�4N OF A CONStRUCTIOM SITE, WHERE
OTHEFt DONNGRADI�NT CQivTFtG�S. INCLUDlNG P�RIMETE'R �ONTROL, �RE IN PLACE. STO�KPI�E
PER1f�AETER CONTROLS 6AAY N0� BE RE�l11REQ.
November 201 Q Urba.n Drainage and Flood Control District SP-3
Urban Storm Drainage Criteria Manua]Volume 3
MM-2 Stockpx�e Management (SM)
�f5'?Cf(pI�E_ PROTr c�Tl��d_h.lklhl�C'?�l:+P�l�:. tl�;TE��
1. INSPECi F�MP; EACH WQRKD?.Y, ANL� h�H.I�likltJ TliEhi IM11 EFFECTINE OPE�AiI1VG CpIV€YITIQ�t.
hdAIEVTENA'�CE CF B�APs SEiQ��iLO B£ PRfJ?.CF1VE, Npi RERCTtSfE. lNSPECT E!l.P� AS SQflN AS
PC�SS�BLE �ANb ALNJAYS V�iTHiN 24 HOURS) FO�LQWIIvG A ST�R�� THRF CAUSES SURFACE
EROSIQN, At�O PERFORP.! N£CES5Af?Y hiPSN��NANCE
2_ FREQUENT OBSERVkTION5 ANd 'v1AINTEFJANCE ARE NECESSARY FO AIkINTAlN BMi�S IN
EFFECTIVE OPERATI�tG CONDITIOH INSPECIIflNS AND CpRRECTlVE M€ASURES 5HOUL� 6E
❑QCIIA�ENTED THRROI�GHLY.
3. NIHERE BMPs HAVE FA€LEC3, REPAIR OR REPLRCE�IENT SHOLkLp BE INfTiATE� UPOM
OIS�OV£ftY OF THE FAILUftE.
ST�KPI PROTECTIQN f�tAINTENt�NC�NQTE�
4. IF PERIMETER P!?6TECTiOf� k�U$T BE k�QUEf3 TO ACCE55 SOIL STOCKPILE. RE?�,4CE
PERIMETER CONFRQLS BY TH� Et�CE �F T�� tii'E1RK�7R,Y.
5 STOCKPiLE PERIMETER CONTROLS C�N BE RE�.IpVED �lV�E ALL THE �IATERIAL FRpM THE
STOCICP€LE HC,S BEEN USEU.
(DETNL5 AI]APTCO FftON P�RKER, COlpR.4pQ, N07 AVN�ABLE IN A�roc�o)
NpTE: hiRfYY JUi?iSDICFIQMS HAVE B�RP D�TAPL5 tHk[ VRRY FRCA� UDFC� SYkF�lOARr� GETaILS.
CON5ULT 1NITH LOCAL JURIS(]iCT10NS A5 70 YIMICN DETAIL SHOULO BF USED WHEN
�IFFERENCES AR£ NOTEfl.
SP-4 Urban Drainage and Flood Cantrol District November 2010
Urban Storm Drainage Criter�a Manual Volume 3
Stockpxle Management (SP) MM-2
� A Pn�� ��N�� � '�—
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� BF�hf r �
ORANGE 5AFETY �
CONE SOIL/LJ+NpSCAPE
kiATER'�At�
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1ri FL01"iL1NE
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RQ.4D CL TARP AtvCHL�R (CINI�FR
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RQA�74YAY -� 6' ti9,:X.
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SEDiMENT CflNTRO� LOG, � �_fi�__�_,1.�^x . isfl�ST t�'�i 5. PVC PEFE
RUGK 56CK. QF2 OiHEf: 81 E LOCAiEQ :YIT�-(IN �
�4'RAPPE6 �.tATEF.Ik�j a ORIVE �ANE
SP-2. MA��RIA�S 5TAGING P� ROADWAY
h+RTERI�aLS STAGING Ihs RC]a0wkY5 INSTA�t_ATI,N �10TF5
1. SEE i'l.RN VlEW FOR
-�LOCATEON OF MR.7ERIA� STAGlkG RP,EA(S]
—CflPfT'S2ACTOk MAY RDJUS€ �{}GRT&�Pti! ANCi 53ZE �F $TAf��tdv AREk 'fikTH APPROVAL
FRpM1� THE LOCAL JUF�15piC110N
2. F�ATURE W1l1Sf BE I!�€5TALLE[l PRif]R f0 ExCAVATI�N, E;f�THV�ORK OF? �E��VERY OF
I�IATERIA�S.
3, MATERIRLS AAlJST BE SFA7fONEQ ON THE PfiLY LINER. RNY lhkCl�ENiAL MATERIALS
D�POSITED ON PA1rEp SECT!'J'� .�R nLpNG �'�1R� LMNE �fU�T B� CLEA�E� UP PRQhlPTLY.
4. POLY LIN�R AND TARP C��/ER SHOULO 8E OF SlGIVIFICANT THICKN£S5 7t7 PREVEN7
DAMAGE OR L�S� flF INTEGRIiY.
5- SANp $kGS h.4AY 8E SUBSTl7UTED Ta ar�GHOR THE CQVEi2 TARP QR P�COV#QE BERMING
u�DER 1HE Br�SE ur�ER.
6 FEATURE 15 NOT iNTE1VGE� FOR li5E titi1T3i 'ti"1ET 4�aTERiA� THRT W�LL 8E GRAINING AND�OR
SPREADING flU7 ON THE POLY L{N�R OR FOR OE�,EOLITi(?N MATERIA.LS.
7. tH15 FE,aTURE CpN 8E USFG FOR;
-IJTiLITY P.E�41RS.
�-IVNEi�E OTHER STAGING �OCAT�QNS AiJO QPTIOMS AftE LIi.4iFE�.
-OTHER LIt,AITEp APPLICATION ANO SHORT OURATION STA��iVG.
November 2Q I� LJrbar�Drainage and Ffood C�ntroi District SP-5
Urban Storm Drainage Criteria Manual Volume 3
MM-2 Stockpile Management (SM}
I�IkTEFIA�,�_�TAG#NG IN��,�1'_iAY MAINrENRNCE NOTES
1. INSPECF 9MPs EACH 1"lORS(pAY, AND hfAiNiA3N THE.Ri fN EFFECTIVE QPERAiING CC3f�01T10N.
�AP.INCENANCE QF SMPs $H���JI.p E� PftO�Ci1VE, ?tOT REAC?t�fE. 1pISPECF E!!?S ?.5 SQC{`: AS
POS516LE {A?�!D AL�'lAYS WITHItJ 24 HQURS) FOLLqWIfVG A STORtv! r�€nr causEs SURF�ACE
ERUSIDN, AfJ� i'ERFDRAI NECESSARY AIAINTENAtti1C�_
2. FREQl1ENT D@SEFtVAiIONS RlJD hlAINTENAI�ICE ARE fVEC�$SARY TQ IUAINTAIIV BMPS IN
EFFECfIVE OPtRATING CC3NDITIOiV 1NSP£CTIQiVS AN(y CQRRECTIVE tvSEASURES 5HOULQ 6E
��Cu�sEtvrED T�iflRD�3CHLY.
3, WNERE BMPs HAVE FAILED, REPAIR OF� R�PI.ACE�IENT SHOUL[3 BE INITI,4iED UPON
l]15COVERY OF THE F.AILLIRE.
4. INSPECr PVC PI�E ALONC CURB LINE FdR CLQGGING AtvD 6EBRIS. REMOvE 085TRUCTIOfVS
�ROMPTLY.
5. i,LEAN h,k7ER2AL FR4M P�4�lEQ SURFACES �Y SWEEFICVG QR VAC[iilMiM1lG.
NOTE, MANY JURlSQICTIONS HA�3F. B�.AP L3ETCJLS THAT VARY FR6M UOFC� STANflARD DETAILS.
C6hl5lJLT �Y1TH LOi:M1L JUP.ISL�ICTIOi�iS RS �0 1VFilCH �E7AIL SHC+ULO 6E IESED 4YHEi�i
Uff r ER�NCES ARE NdF�£0.
{GErw�S aDAAFED FkQ�� aUROR4, COLQAnDQ}
SP-6 Urban Drainage and Flood Control Uistrict November 2010
Urban Storm Drainage C�iteria Mamial Volume 3
Good Housekeeping Practices (GH) MM-3
Description �..�-�� ,,'„' �.. 6�°� - ..
,����-J' �' ;�C�'� �. �
` . � �r" �i. ., ,.
Implement construction site good housekeeping practices to ���.��� `'
prevent pallution associated with solid, liquid and hazardous � � ��� � . {`.:�
construction-related materials and wastes. Stanmwater �` ' �
Management Plans (SWMPs)should clearly specify BMPs i�UpC���
including tnese good housekeeping practices: '��"'�`�" `� , �a�
�` ;:-� ,� :
�,,. `�,_,.,� �
■ Provide for waste management. � � • '� ��
E �`'����F�� - r �,�i
, : �
■ Establish proper building material staging areas. "`-#� `� � � � ..�' � `
■ Designate�aint and concrete washout areas. x.
r•
• Establish proper cquipment/vehicle fueling and - � �
maintenance�racEices. �
., .��
• Control equipment/vchicle washing and allowable rson- '�""'"T` ��;-�
storrrtwater discharges. y, ,�...�-� ,�,��,`
" ��
■ Develop a spili prevention and response plan. � � ���
. . ' ' 'Y:�
Acknowledgement: This Fact Sheet is based dir�ctly on ,; . �. . ' ��-,;:-� ' '
EPA guidance provided in Developing Yor�r Stormwater nlwto�raphs GH-1 and GH-2. Pi-oper malerials
Podlut�nla Prevent Plan(EPA 2007). storagc anc�secondaiy contasnment f'or f'uel tanks
are importanl good housckeeping practices. Photos
Appropriate Uses tourtesy of CDOT and City of Aurora.
Good housekee�ing practices are necessary at al] construetion sites.
Design and Instal�ation
The following principles and actians slaould be addressed in SWMPs:
■ Provide for Waste Mana�ement. Implement management procedures and practices to prevent or
reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes
that will be generated at the sitc. Practices such as trash disposal,recycling,proper rnaterial handling,
and cleanup measures can reduce the potentiai for stormwater runoff to pjek up construction site
wastes and discharge them to surface waters. Irnplement a comprehensive set of waste-management
gractices for hazardous or toxic materials,such as paints, solvents,petroleum products,pesticides,
wood preservatives, acids,roofing tar,and other materials. Practices should include storage,
handling, inventory,and cleanup procedures, in case nf spills. Specific practices t�at should be
considered include:
Salid or Construction Waste Good Honse�eeping
o Desigxzate t�rash and buik waste-collection areas on- �'�netions
site. �rosion Control No
Sediment Control l�o
Site/Material Mana ement Yes
November 2410 Urban Drainage and k'lood Control District GH-1
Urban Starm Drainage Criteria Manua]Volume 3
MM-3 Good Housekeeping Practices (GH)
a Recycle materials whenever possible(e.g.,paper,wood,conerete, oil).
o Segregate and provide proper disposal options far hazardaus matez�ial wastes.
o Clean up Iitter and debns fram the construction site daily.
o I.,ocate waste-coliection areas away fram streets,gutters, watercourses,and storm drains. Waste-
collection arcas (durRpsters, and such)are aften best located near construction site entrances to
I miniinize traffic on disturbed soils. Consider secondary containment around waste collection
areas to minimize the likelihood of contaminated discharges.
o Ernpty waste containers before thcy are full and overflowing.
Sanitary and Septic Waste
o Provide convenient,well-maintained,and properly located toilet facilities on-site.
o Lacate toilet facilities away from storm drain inlets and waterways to prevent accidental spills
and contamination of stormwater.
o Maintaan clean restraom#'acilities and e�pty po�table toilets regularly,
o Where possible,provide secondary containment pans undez portable toilets.
o Provide tie-downs or stake-downs for portable toitets.
o Educate employees, subcontractors,and suppliers on focations of facilities.
o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not
discharge or bury wastewater at the construction site.
o Inspect facilities for leaks. If found,repair or replace unmediately.
o Special care is necessary during maintenance(pump out)to ensure tl�at waste and/or biocide are
not spilled on the ground.
�
Hazar[�ous Materials and Wastes '•�..,, �` • �" ; t��
�`� �
o Develop and implemcnt enrapioyee and '` ''� �:s •
'ti� ;-k. -; ..�. _
subcontractor education, as needed, on .� � "`
hazardous and toxic waste handling, f �;;r,�: � � � r � �
storage, disposal,and cleanup. - � - j ; ; ; '
o Dcsignate hazardous waste-collection I ' .�'Y `
- �. � `�
areas on-site. ' � �
::K _ .�;:�. �}�
•�j�F `+��.,��.,.ir" �,.����' � 'Ai... '�-'.r'tij.r_1
o Place all hazardous and toxic material � •� ��-..
wastes in secondary containment.
Photograph GH-3. Locate portable toilet Facilities on leve!
surfaces atvay fro�n waterways and siorm drasns. Photo
courtesy of W WE.
GH-2 Urban Drainage and Flood Control District November 2010
Urban Storm Drainage Criteria ManuaE VoIurne 3
�ood Housekeep�ng Practice� {GH) MM-3
o Hazardous vvaste containers should be inspected to ensure tl3at all containers are labeled properIy
and that np leaks are pzesent.
� Establish Froper Building Material Hat�dling and Staging Areas. The SWMP should includ�
comprehensive handling and management procedures for building materials,especially thpse that aze
hazardaus or taxic. Paizzts,solvents,pesticides,fuels and oils,other hazardaus materials or U�ilding
materials that l�a�e the potentiai to eontaminate stormwater sbouid be stored indoors or under cover
whenever possible or in areas with secondary containnaent. Secondary containment in�asures prevent
a spill from spreading across the site and may include diices,berms,curbing,or other containment
amethods. Secondary containment techniques should also ensure the protection of groundwater.
Designate s#aging areas for activities such as fueling vehicles,mixing paints,plaster,mortar,and
ofher potential pallutants. Designat�d staging areas enable easier monitoring of the use of materials
and clean up of spills. Training employees and subcontractors is�ssential ta the success of this
� pollution prevention principle. Cansider the foIIowing speci�ac materials handling and staging
practices:
�
o Train employees and subcont�ractors in proper handiing and storage practices.
:i
I o Cleariy designate site ar�as for sYaging and starage wzt�signs and on construction drawings.
Staging areas shouid b�Iocated in areas central to the construction site. Segmen�the staging area
into sub-areas designated for vehicles,equipment, or stockpiles. Cons�ruction entrances and exits
shouId be cIearly marked so that deIivery vehicles enter/exit through stabilized areas with vehicle
tracking controls(See Vehicle Tracking Control Fact Sheet).
� o �'zovide storage in accordance with Spill Protection,ContrnI and Countenmeasures(SPCC)
� requirements and plans and provide cover and impermeable perimeter controI,as necessary, for
� hazardaus materials aud contaminated soils that rnust be stored on site.
€
o Ensure that storage cantainers are regularly inspected far leaks,conrosion,support or foundation
failure,or other signs of deteriaration and tested for soundness.
o Reuse and recycle canstruction materials when possible.
• Designate Concrete Washout Areas. Concrete contractors should be encauraged to use the washout
facilihes at th�ir o�vn plants or dispatch facilities when feasible;howev�r,conerete washaut
commonly occurs on construction sites. If it is necessary to provide for concrete waslaout azeas on-
site, designate specific washout areas and design facilities fo handle anticipated washout water.
Washout areas should also be provided for paint and stucco opezations. Because washout areas can
be a source of poilutants fro�n leaks or spills,care must be taken with r�gard to Yheir placerr�ent and
propez use. See the Concrete Washout Area Fact Sheet for detailed guidance.
, Both self-constructed and prefabricated washout containers can fill up quickIy when coner�te,paint,
; and stucco wnrk are occunning on large portions of ihe site. Be sure to check for evidence that
j contractors are using the washout areas and not dumping materials on#o the ground or into drainage
€ facilities. If the washout areas are not Ueing used reguIarly,coz►sider posting additional signage,
€
relocating the facilities ta more convenient locations,or providing training to workers and
i contracfors.
€
� When coucrete,paint,or stucco is part of tl�e constructio�process, consider these practices which wiIl
€ help prevent contamina�ion of stormwater. Include the Ipcations of these areas and the maintenance
and inspection procedures in the SWMk'.
November 2010 Urban Drainage and Flood Cantrol District GH-3
Ur�an$tarm Drainag�Cariteria Manual Volume 3
MM-3 Good Housekeeping Pract�ces (GH}
o Do not washqut cancrete tzucks ar equipment into storm drains,streets,gutters,uz�contained
azeas, or st�eams. Only use designated washout areas.
o EstabIish washout areas and advertise th�ir locatzons with signs. Ensure that signage rernains in
good repair.
o Provide adec�uate containment for the amount of wash«+ater tkaat will be used.
o Inspect washout struetures daily to detect leaks or tears and to identify when materials need to be
remaved.
o Dispose of materials properly. "I"he pzeferred metlnod is to aIIow the water to evaporate and ta
recycle fhe hacdened conczete. �'ull sezvice companies may provide dewatering services and
should dispose o�wastewater properly. Concrete wash water can be highiy polluted. It should
not be discharged to any surface wat�r,storm sewer systerz�,or allowed to infiltrate into the
ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer
system withput�'ust receiving written permission from the system ogeratoz.
' • Establish Proper Equipment/V�hiele Fueling and Maintenance Practrces. Create a cIearly
�
-� designated on-sit�fueling and maiutenance area that is clean and dry. The on-site fueIing area should
Fiave a spill kit,and sta�'shouId]cnow how to use it. If possibl�,conduct veh�cle fueling azzd
maintenance activities in a covered area. Consider the following prae�ices to help prevent the
discharge of pollutants to stormwater from equipz3nent/�ehicle fueling and maint�nance. Include the
locations af designatec[fu�ling and maintenance areas and inspection and maintenanc�procedures in
� the SWM�'.
�
� o Train�mployees and subcontrac�ors in proper fueling procedures(stay with vehicles during
� fueling,proper use of pumps,emergency shutoff valves,etc.}.
o Inspect on-site vehieles and�quipment regularly for ieaks,ec�uzpment damage,and other servic�
problems.
o C1early dcsignate vehicIe/equipmen�service areas away from drainage facilities and watercourses
ta prevent stormwater run-on and runof£
o L]se cfrip pans,drip eloths,ar absorbent pads when replacing spent fluids.
o Collect all spent fluids,store in appropriate laUeled containers in the proper storage areas,and
recycle fluids whenever possible.
■ Control Equipment/Vehicle Washing and Allawab[e Non-Stormwater Discharges. Impiezzient
; practices to prevent contamination of surface and graundwater frozxz equipment and vehicle wash
water. Representative practices include:
o Edncate emplayees and subcontractors on proper washing pracedures.
� o Use off-site washing facilities,when available.
€
� o Clearly mark the washing areas and inform workers that all washing must occur in this area.
€
`' o Contain wash water and treat it using BMPs. Infilirafe washwater when possible,but maintain
separation from drainage paths and wa�erbadies.
GH-4 Urban Drainage aud Flaod Control District Novemher 20 i 0
Urban Starm Draizzage Criteria Manual Volume 3
Good Housekeep�ng Practices (GI3) MM-3
a Use high-pressure water spray at vehicle washiz�g facilities without detergents. Water alone can
remove most dirt adequately.
o Do not conduct other activities,such as vehicle repairs,in che wash area.
o Include the locatian af the washing facilities and the ins�ectio�and maint�nance procedures in
the SWMP.
• De�etop a Spi[I Prevention and Response PCan, Spill preventzon and response procedures must be
identifi�d in the SWMP. Representative procedures include identifying ways to reduce the chance of
spills,stop the source of spills,contain and clean up spills,dispose of materials cantaminated by
spills,and train personnel responsible for spilI prevention and response. The plan should also specify
rnaterial handling praceduzes and stozage rec�uirements and ensure that clear and eancise spill cleanup
procedures are provided and posted for areas in which spilis may potentially occur. When developizag
a spill prevention pIan, include the following:
o Note the loca�ions of cheznical storage azeas,storm drains,tributary drainage areas,surface
� waterbodies on oz neaz the site,and measures ta stop spills from leaving the site.
o Provide proper handling and safety procedures for eaci�type of waste. Keep Material Safety Data
�' She�ts(MSDSs)for chernical used on sife witb the SWMP.
o Establish an education program for�mptoyees and suhcon�-actors on the gotential hazards to
humans and the environment fram spills and leaks.
€ o Speci�y how to notzfy appropriate authorities,such as police and fire departmenYs,hospitals,or
� municipal sewage treatment facilities to request assisfance. Emergency proc�dux-�s and contact
� n�nbers should be provided in the SWMP and post�d at storage locations.
E
� o Describ�the pzoc�dures,ec�uipment and materials for immediate cleanup af spills and proper
disposal. �
o Identify personnel responsible far implementing the plan in tl�e event of a spill. Update the spilI
pzevenfzon plan and clean up materials as changes occur to the types of chemicals stored and used
at the facility.
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Navember 2010 Urban Drainage and FIood ControI Disfirict GH-5
Urban Storm Drainage Crite�a Manual Voiume 3
MM-3 Good Housekeeping Practices (GH)
Spill Prevention, Controi, and Countermeasure{SPCC)Plan
Co�7struction sites may be subject to 40 CFR Part 112 reguiations that rcquire tl�e preparation and
implementation of a SPCC Plan to preveart oi]spitls from aboveground and underground storage tanks.
Tlze facility is subject to this rule if it is a no��-transportation-related facili.ty that:
� ■ Has a toYai storage capacity�rcater ttian 1,320 galions or a complctely buried storage capacity
• greater fhan 42,000�;allons.
■ Could reasonably be expected to discilarge oil in c�uantities that may be l�armful to navigable waters
of the United States and adjoining shorelii�es.
Furthermore, if the faciiity is sub}ect to 40 C�'R Part 112, tl�e SWN(P sliould reference the SPCC PEan.
To find out more about SPCC Ptans,see EPA's website on SPPC at w����.c��a.�o�_ia�il,5c�ill/�E�cc.t�ts�i.
Re�orti�g Oil SpiE(s
In the event of an oil spill,contact the National Response Ccnter toll free at 1-800-424-8802 for
assistance, or for inore cietails,visit thcir websitc: wy�.n�c.usc�.a�lil.
Maintenance and Removal
Effective implementation of good housekeeping practices is dependent on clear designatian of persannel
responsi�fe for supervising and imple�nenting good housekeeping programs,such as site cleanup and
disposal of trash and de6ris,hazardous material management and dispasal, vehicle and equipment
maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness.
Checklists may be helpful in gnod housekeeping effo�rts.
Staging and storage areas rec�uirc permanent stabilization when the areas are no langer being used for
construction-rclatcd activities.
Construction-related materials,debris and waste must be removed from the construction site once
construction is complete.
Design Details
See the following Fact Sheets for related Design Detaiis:
r
MM-1 Concrete Washout Area
MM-2 Stockpile Management
SM-4 Vehicle Tracicing Control
Design details are not necessary for other good housekeeping practices; however,be sure to designate
where specific practices will occur on the appropriate construction drawings.
GH-6 LTrban Drainage and Flood Control District Novernb�r 20]0
Urban Storm Drainage Criteria Manual Volume 3
Good Housekeep�ng S-5
D�SCrip�ipn
3 .. ,
Good housekeeping practices are designed �:�"" • ;;''�f• �
. ; ,; ,;
� �
to maintain a clean and ordErly work ,I �.,� ' , ,,. �. �' :,�
environment. The most effective first �'1 ,` /;
�� � .
stcps towards prcventing pollution in f� ,,/�,f/':' 1 4
siormwater from work sites simply � ' ��
y
f� .°, . ��
f'%! ; f i ' f
involve using common sensc to improve !'';/��� ,, /
f�� S
the facility's basic housekceping methads. t^� :,,� f�f�,-� �
Poar housekeeping practices result in � �
inereased waste and potential for j: ;•;I. `�I� �
stonExiwatcr contamination. ' � �
����� ��
A elean and orderly work site reduces the .�� �.�~
possibility af accidental s�ills caused hy ' ' '�'�
mishandling af chemicals anci equipment � +�'�
and should reduce safety hazards to Photograph GH-l. Use dry clean-up methods to remove spilled
personnel. A we11-Inaintain�C�tTiat�I'ia�and �aterials. Phota couriesy of Colorado Nonpoint Source Program.
chemical storage area will t-educe the
possihility of starmwater rnixing with poliutants.
Some simple procedures a facility can use ta promote good housekeeping include improved operation and
maintenance of machinery and processes,materiai storage practices,material inventory controls,routine
and regular clean-up schedules,rnaintaining well organized work areas,signage, and educational
programs far employees and the general public abaut all of these practices.
Appropriate Uses
Good hausekeeping practices require education and training,typically targeted to industries and
businesses,municipal empfayees,as well as the general public.
Practice Guidelines
Good housekeeping praetices include thesc general areas:
■ Operation and Maintenance
• Material Storage
■ MaterialInventory
■ Training and Participation.
Operation and 1Vlaintenance
Cansider implementing the following practices:
■ Maintain dry and clean floors and grownd surfaces by using hraorns, shovels,vacuurns or cleaning
machines,rather than wet clean-up methods.
■ Regularly collect and dispose af garbage and waste materiaE.
November 2010 Urban Drainage and Plood Control District GH-1
Urban Storm Drainage Griteria Manual Volume 3
S-5 Good Housekeep�ng
• Routinely inspect equipment to ensure that it is functioning properiy without leaking and conduet
preventative maintenance and needed repairs.
■ Train emplayees on proper clean up and spill response procedures.
■ Designate separate areas of the site for auto gar�Cing,vehicle refueling and routine maintenance.
■ Promptly clean up leaks,drips and other spills.
• Cover and maintain dumpsters and waste recegtacles. Add additional dumpsters or increase
frequency of waste collection if overflo�ving conditions reoccur.
• Where outdoor painting and sanding oceur,impl�ment these practices:
i
o Conduct these activities in designated areas that parovzcie adequate protection to prevent pverspray
and uncnntrolled ez�issions. All operations should be conducted on paved surfaces to facilitate
cleanup.
o Use portal�le containment as necessary for outside operations.
o Clean up and pzoperly dispose of excess paint,paint chips,protec�ive eoatings,grit waste,etc.
� Maintain vegetation on facility grounds in a mannex that rr�inirr�izes erosian. FalIow the Landscape
Mainfenance and I'esticide,H�rbzczde and Fertiiizer Usage BMI's to ensure that zninimum amounts of
; chemicals need�d for healthy vegetation are applied in a manner�hat minimizes transport af these
� materials in runofF.
Material Storage Practices
Praper storage techniques include the followzng:
■ Provide adec�uate aisle space to facilitate maferial transfer and ease of access for inspection.
� Store containers,drums,and bags away from dizeot traf�c routes to reduce container damage
resulting in accid�ntal spzlls.
• Stack containers according to manufacturer's instructions tq avoid damaging the coutainers from
improper weight distribution. Also store materza.ls in accordance with directions in Mat�rial Safety
Data Sheets (MSDSs).
■ Store containers on pallets or similar devices to prevent corrosion of containers that results from
containers eorning in contact with moisture on the ground.
� ■ Stare toxic or hazardous liquids within curbed areas or secondary containers.
�
�
�
[ Material�nver�tory Practices
[
[ An up-to-date materials inventory can keep material costs down by preventing overstocking,track how
( materials are stored and handled ansite,and identify which materials and activities pos�ihe rnast risk ta
the environment. Assigz�zesponsibility of hazardous material inv�ntory to individuals trained to handle
sueh znatezials. A material inventory should include these sfeps:
■ Identify all chemical substances present at work site. Ferfarm a wallc-tl�rough of the site,review
GH-2 Uzban Drainage and Flood Control District Novemb�r 2010
Ur�an Storm Drainage Criteria Manual Valum.e 3
Good Housekeeping S-5
purchase arders,list all cl�emical subsfances used and obtain Materiai Safety Data Sheets(MSDS)for
aII chemica.ls.
■ Labef all containers. Labels should provide name and type of substanc�,stock number,expization
date,heaIth hazards,handling suggestions,and first aid informatiqn. Much of,this information can
be faund on an MSDS.
■ Clearly identify special handling,storage,use and disposal considerations for hazardpus materials on
the maYerial inver�tpry.
• Institute a shelf-life program to improve material tracking and inventory that can reduce the amount
of materials that ar�overstocked and easuz�proper disposal of expired materials. Gare�ul txacking of
materials ardered can result in more efFicient materials use. Decisions on the amounts of hazardous
matezials that are stored on site sho�ld include an�valuation of aray emergency control systems that
are in glace. AII storage areas for hazardaus materials should be designed to contain spills.
Traini�g and Par�icipatian
, Fr�quent and praper training in good housekeeping techniques reduces the likelahood that chemicals or
equipment will be mishandled. To promote good housekeeping, consider implernenting these practices:
■ Discuss good housekeeping practices in�zaining programs and meetings.
■ PubIzcize gollutzon prevention concepts through posters or signs.
E • post buIIetin boards�vith updat�d good hausekeeping procedures,tips and reminders.
�
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�
i
i
3
s
E
E
�
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Navember 20i0 Uzban Drainage and Flood Control District GH-3
Urban Storm Drainag�Criferia ManuaI Volume 3
Vehicle Maintenance, Fueling and Storage S-7
Description ��
�`'�r.,
Areas where vehicles are fueled, � . , ,�?,. `
maintained,and stored/parked can be .���-` `� � ' . '
pollutlnt"hot spots"that can result in �" �- -
hydrocarbons,trace metals,and other '� ,,��;.� ,��,.,�', .,�, '"'k� "i"
pollutants being transported in stor�nwater � �--� � _ '"'� `��.'� � �
� y ..� ti�4[•tX's o ,.: ,
runoff. Proper fueIis�g operatians,storage � '-� � � s `�t".,�.•.
of automotive fluids and e.ffective spill �,�;�i�'��'' �,
clea.nu�procedures can heip reducc "�#`' "''� ��`"w " �
ti.� ,
.�..�;.:,. .
contar►�ination of stonnwater itinaff from �~ .�:�y�;� ,,
vehicic rnaintenance and fueling facilities. _ .
Fuel�related spiils can occur due to
inattention ciuriRg fueling or"topp�n�off'
fiiel tanks. Conunon activities at
corr��ercial, industrial and municipal
maszatealance shops ii�clude pairts cleaniy�g,
Photograph V�'-1. Use dri��pa�ts to collect]eaks fi•om vehicles until
vehicle fluid replacement,and equipmeilt ,•e�,�i,s caz�be co�npleteci. Pl,nto courccsy of�'om�ore.
replacement and repair. Somc of the
wastes ge�lerated at auto3nol�ile mait�tenance facilities include sol�ents(degrca5ers, paint thinners, etc.),
antifre�ze, brake fluid and brake pad dust,battery acid,motor oil, fuel,and lubricating grease. Fleet
storage areas and customer and empioyee parking can also bc a source of venicle-related contamination
frorn leaks,antifreeze spills, etc.
Appropriate Uses
These BMP guidelines are applicable to vehicle maintenance, fueling, fleet storage and parking facilities.
Be aware that wasl�ing vehicles and equipment autdoors or in areas where was�l water flaws onto the
ground can pollutE stormwater. Vch.icle wash water i.s considered process wastewater that shoulci not he
discharged to the stonn sewer systern. Consult state and federal discl3arge permit requirements for proper
disposal of vehicle washwater, which is typically accomplished througll discharge to the sanitary sewer
systesn.
Practice Guidelines'
Vehicle Maintenance
The most effective way to mininlize wastes generated by auYomotive maintenance activities is to preven�
their production in the first place. Consider adopting these practices:
■ Perform maintenance activities inside or under caver. When repairs cannot�e performed indoors,he
sure to use drip pans or absorbents.
■ Keep equipment clean and free of excessive oil and grcase buildup.
' Guidelines adapted froin the USEPA Menu of BMPs.
November 2010 Urban Drainage and Flood Control Districc VFM-I
Urvan Storm Drainage Criteria Manual Volume 3
S-7 Vehicle Maintenance, Fue��ng and Storage
■ Promptly cleanup spills usiiig dry metliods and properly dispose of vvaste. Wf�en water is rec�uixed,
use as little as possible to clean spills,leaks,and drips.
■ Use a solvent callection service to coll�ct s�ent solvent used for parts cleaning. Where practical,use
detergent-based, steam cleantng, or pressure-based cleaning systems instead of organic solve»t
degreasers when practical. (Be aware that cleaning water discharg�d z��to the sanitary sewer may
r�quire pre-treatment prior to dischazge.)
• When�lsing lic�uids for cleaning,use a centralized station ta ensure that salv�nts and residues stay in
one area. Locate drip pans and draining boards ta direct solvents�ack into a solvent sink or holding
tank for rcuse.
■ Store used oi1 for recycling in labeled fanks. Lacate used oil tanks and drums away from storm
drains,flowing streams,ai�d preferably indoors.
• Us�non-hazardous or l�ss l�.azardous alternatives when practical. For example,replace chlorinated
oiganic solvents witii non-cl�lorinated ones like lceros�i3e or mineral spirits.
;; ■ Prop�rly recycle or dispose of grease,oil, an�zfre�ze,bralce fluid, cleaning solutions,hydraulic fluid,
� batt�ries,transrr�ission�Liid,worn parts, �Iters,and rags.
:i
■ Drain and crusl�oiI filters Gefore recycling or disposal.
° Drain all�€uids and remove batteries from salvage�ehicles and equipment.
� Closely monitor parked vehicles for leaks and plac�pans�mder any leaks to callect the fluids for
prpper dispasal or recyciing.
; ° InstalI bei�ns or other measures to contain spills and prevent work surface runoff frorr►entering stnrm
� drains.
� • Dev�lop and fallaw a spiRl parevEntion plan. This i�icludes a variety of ineasures sueh as spill kits and
- knowing wl�ere storm drains are located and how to protect them(e.g., d�'ain mat,bern�}when Iarger
- spills occur. {See the 5pi11 Prevention,Containment and Cantral�MP for more information.)
- ` Conduct peziodic ezx�ploye�training to reinforce proper disposal praetices.
€
■ Prornptly Eransfer used fluids to recycling drums or hazardous waste containers.
■ Store cracked batteries in leak-proaf secondary coz�tainers.
, ■ Inspect outdoor storage areas regularly for drips,spills and irnproperly stnred matez•ials{unIabelcd
E
! containers,auto parts that might contain grease or fluids, ete.}. Thzs is particularly important for
! parking ar�as for vehicles awaiting repaiz.
�
� Structural stormwater BMPs in vehicle hotspot areas require routine cleanout of oil and gr�ase,
sorr�etimes monthly or more frequently. During periods of heavy rainfall,cleanout is required more
= often to ensure that pollutants are not was�ied through the trap. Sediment remo�al is also rec�uired on
[
j a regular basis to keep the BMP working efficiently.
f
VFM-2 Urban Drainage and Fiaod Control Disirict Nqvember 20I0
Urban Storm Drainage Criteria Manual Volume 3
Vehic�e Main�enance, Fue��ng and Storage S-7
Vehicle Fueling
■ Designated fueIing areas should be designed to prevent sto�wat���zunoff and spills. For example,
fuel-dispensing areas should be paved with conc�-ete or an equivalent impervious surface,with an
aaec�uate slope to prevent porzdizzg,and separated from tl�e rest of the site by a grade break ar berm
that prevents run-on of storr�iwater.
= Fucl dispensing areas shotrld be covered. Th�co�er's minimum dimensions must be equal to or
greater�han the area within tlle gzade break ar tiie fuel dispei�sing area so that the fueling area is
completely cavered. It may be necessary to install and rnaintain an oil captuze device in catcfi basins
that have the potential to receive runaff frazrt�k�e fueling area.
� �`or facilities where eq�.�ipm�nt is bei�lg fueled with a mobile fuei truck,establisl�a designateci£ueling
( area. Place temporary"caps" over n�arby catch basins ar manhole covers sa that i£a spill occurs,it is
; prevented from entering�he stn��m drain. A foz�m of secondary containment should be used when
transf�rring fuel fraxza tl�e ta��k truck to the fuel tank. Storm drains ii3 ttie vicinity should also be
covered. Instal!vapor recovery nozzles to help control drips,as well as reduce air pallutipn.
� ■ Keep spill response infprr►�ation anc�spill cl�anup znaterials onsite and readily available.
:I
■ Fuel-dispensing areas should be inspected reguiarly anci repair prompt[y compEeted. Insp�ctors
should:
o Check for external corrosion aizd structural failure in aba�cground tanks.
� o Cl�eck for spills anci overf"ills due to operator enror.
�
¢ o Check for failue�af any piping systems.
�
q Check for leaks or spills during putnping of liquids o�:gases frozn.a truck Qx rail car to a storage
faeility or vice versa.
o VisuaIly ii�spect new tank or container installations for loose�'ittings,poor welds,and improper or
�ooriy fit��cf gaskets.
o Inspect tank£oundations,connections,coatings,tank walls, and piping systems. Look for
¢ corrosion,leaks,cracks,scratches, and other physical damage�hat may weaken the tank or
E
� container system.
E
E
� Aboveground and�eIowgrouz�d tar�ks should be tested periodieally for integrity by a qualif eci
� professional.
; ■ Dry cleanup methods sho�rld he employed when cleaning u�fuel-dispensing areas. Such methods
E include sweeping to zeznov�litter and debris and using rags and absorbents for leaks and spills.
E Water shouId not be used to wash these areas. During routine cleaning,t�se a dam�cloth on the
pumps and a damp mop on the pavement,rather than spraying witl�a hose. Fuel dispensing nozzles
t should be fitted with "l�qid-ppen latckaes" (automatic shutoffl except where prohibited by local fire
departments. Signs can be posted at the fuel dispenser or island warning vchicle ownersfoperatprs
against"topping off'vehicle fuel tanks.
■ Writ�en procedures that describe these BMPs should be provided to employees who will be using
fueling systems.
Novernher 20I0 Urban Drainage and Flood Control District VFM-3
Urban Storm Drainage Criteria Manual Volume 3
Landscape Maintenance S-9
Description �:�..
Proper landscape maintenanee, including �
maintenance of vegetated stprmwater ' ! �
.-�r, ; .,� �
BMPs, is important to reduce nutrient ��� '
and chcmical {oadi�g to the stonn drain �- _..� �r_��m� *�� ,�,,. �
system,reduce nuisance flows and •-
standing water in storrnwater BMPs and ��
° �, ,..:;;;s" I��
maintain healthy vegetation that helps ,
�
minirnize erosion. Additionaily,when � '�'• -
Iandscapes and vegetated BMPs are over- � �'�
irrigated,the ground remains saYura�ed �� #'�}'�
and capacity to infiltrate runoff is ��-+ -
reduccd. � _ t _ "�
1'. .. "':�T�.�L,
�` �w
Appropriate Uses
Photograph LM-1. Qver-in•is�ation and overspray can wash fertilizers
and lawn chemicals into the stoi-in drain system. These f]aws can
AppCOpl"1atC 1dWn CaCC pt'aCt1CCs aCe comingle with stoiY��runotT<ind caiise nuisance flow conditions in
1�pElCab�C t0 CeSiC�entl3l, COn1Il1CCCla1, stormwater BMPs. Photo courtesy of the Cily of Westminsier.
municipal,and some industrial operations.
Practice Guidelinesl
Practice guidelines far a healthy lawn that reduces pollution ciuring both wet and dry weather conditions
include a combination of practices such as mowing, aeration, fertilization,and irrigation. Also, sEe the
Pesticsde, Heebicide, and Fertilizer Usage BMP for information on proper use of these chemicals and
Integratcd Pest Ma�iagement(IPM} strategies.
Lawn Mowing and Grass Clipping WastE Disposal
• Keep lawn clippings and deUris ouf of gutters. When�lowing waliCways or mowing lawns, direct
equipment so that the clippings blow back onto the lawn rather than intn ti7e street, or co3lect
elippings blown onto the street and properly dispose of them.
■ Mulch-mowing turfgrass at a height of 2.5 to 3 iiiches helps turfgrass develop deeper root systems.
No more than one-third of the grass biade should be removed in a single mowing. Mulched grass
clippings can return roughly 25 to 30%of the needed nitrogen that grass rec�uares to be healthy,
tkaereby reducing Fertilizer re�uirements. Avoid throwin�grass clippings onto streets and sidewalks
to reduce nutrient pollution to surface waterbodies.
■ Minimize thatch developmenY by mowing at appropriate frequencies and hcights for the grass type,
avoiding overwatering, preventing over fertilization,and aerating the turf.
� These practice guidelines have been adapted from fhe GreenCO Best Management Practices for the
Corrservatio�a and Fi•ateetion of Water Q�aralitv ifz Color�ado: Moving Toward St�stcrinability(GreenCQ
and WWE 2008). See this manual for aclditional detai] and references.
Nnvember 2010 Urban Drainage and�'lood Control District LM-1
Urban 5torm Drainage Crateria Manual Volume 3
S-9 Landscape Maintenance
Lawn Aeratioz�
■ Aerate turf once or twice per year,as needed, in the eariy spri�l�and/or late fall to aid in capturin�the
nat�iral precipitation during non-weed germination periods and prior to adding organic rnaterials and
fertilizers. Aeration reduces sail compactton and helps controt thatch ii�lawns w�lile helpi�g water
and fcrtilizer movc into the raot zone.
■ A lawx�can be aerated at any tirrie the ground is not frozen, but should not be cione when it is
extrernely hot ancl dry. Heavy traffic areas r�Till rec�uire aeration more frequently.
■ Do not use sgike-type aerators,which compact thc
soil. Iioles sh�uld be two to three inches deep and
na more than two to four inches apart.Lawns
should be thoroughly watered the day before
aerating so plugs can be pulled more deeply and Phosphorus
easily. Mark al] sprinkler heads,shallow irrigation p}�ospharus is commoniy overused
lines, and buried cable TV Iines before aerating so and ap�lication shauld be based on
those lines will not be damaged. �p�1 tests. Phosphon.is washing into
F�rtilizer Applieation surface waterbodies leads to
excesstve atgae growtli.
• Apply fertilizer when needed to achieve a clearly p�flsphorous docs not move out of
defined objective such as incrcasing shoot growth, the soit iiEce nitragen,so canstant
root growth, flowering or fruiting;enhancing
foliage color,and plant appearance;or correcting additions are unnecessary.
or preventing nutrient de#iciencies.
■ Because manufactured fertilizers can be relatively
high in nutriei�t cantent, it is critica�to fo��ow the
inanufacturer's directians, using th�rninimum
amount recoinmended. Over-application"l�urns"
iea�es and inay lead to water pollution,thatcli buildup,excessive mowing, and weed growth.
■ OnEy apply nutrients the plants can use. Fertilizer labels identify prod�rct contents in terms of ratios
that indicate percentage of ingredients by product weight.
Soil Testing
Therc are se�ezai qualified Iaboratories in Coiorado that�rovide soils tests to detez�rn.ine
recommendatians for fertilizer type and a�plicat�on ra.tes. Tt�ere are also commercially availabte
quick test kits that are less acc�ate b�t ca�Id be used by a homeowner. �Vithaut an analysis,a
homeowner may be t�uyzng unnecessary ferti�izer or applyin�too m�ch. A$20 to$40 soil analysis
has potential to save an owner much r�tore.
The CSU Extension peagram offers a soii tcsting service. Contact the CSU Fxtension far yaur
county or visit I�tt�:; ���t��.c�t.�oJoStatc.ctlu far more information ine�udi��g a list af la�oratories.
LM-2 Urban Drainage and Flood Control DisErict Noveinber 20I 0
Urban Starm Drainage Cxiteria Manual Volume 3
Landscape Maintenance S-9
■ Wl�en praetical and appropriate,hase fertili2er application on soiI analysis. Be aware tl�at at rnany
new development sifes, soil conditions fallowing grading often iio longer consist of topsoil.
'Baseznent" soils witl� poor texture and low nutrient content may be present. As a rest�lt,soil
amcndznent is o£ten needed to improve tfi�physical properties (tiltl�) o#'the soil to provide a better
environment for plant raats to in�pro�e nutrient uptake. Soil analysis can help to identify soit
arnendments that improve bath the physical and nutrient characteristics of�he soil,as well as identify
�ertilizatzo��z-ec�uirements.
� Utilize split applications nf slow-relcase{cantrafled-release}fertilizer forms such as IBDU, sulfur-
coated�rea and natural ozganic-based fer�iEizers (not to be confused with raw manure)to minimize
th�risk of nutri�nts leaching into grounclwater or running pff in surface water. When properly
' applied,other forms of f�rtilizer can also be safeEq used,provided tl�at over-wat�ring and over-
` ���f1�IZat10ri d0 ilOti 6GGUL.
p When applyin�fertilizer,broadcast it usaiforn�ly over tl�e targe�ed area of the landscape. I�ee�
fer�ilizer off�treets,sidewalks, and cl�iveways to�revent water pollution. Fertilizer that inadvertentIy
falls on impervious s�iz-�aces should be swept back onto the law�a.
� ■ Recoinmendations for fertilizer application vary among industry professionals. CSU Extension's
3 fertilizer recommendations foz�staUlished Colorado lawns are provided in the tabie below. Site-
sp�cSfic conditions s�ould also be considered wlie�l detei7nining the need�'or fertilizer.
Table LM-�. CSU Extensifln Recommendations for
Nitrogen AppIication Rate
s
Nitro en A lztatio�Rate in Pounds1I,000 s .ft.
� Mid-Marc��to May ta Mid- Ju1y to Mid-August to Early October f H
� Turfgrass Speeies A p r i l"°e J u n e a �arIy� Mid- e � Early N oveznber '
� Au ust Se t�mber '
�� High Maintenance Not
Blue ass R e rass a'$�� � Re uired I I-2{optional)
�
Low Maintenance � 5 � 5_� Nflt � 1 (optional}
BIue ass Re uized
Tall�'escue 0.5 0.5-I R�°Le� 1 1 (optional)
Fine Fescue 0.5 O.S-1 Re uired 0.5-1 None
Bu£�'alo grass,BIue
; Grama,B�r�nuda None 0.5-1 0.5-I Nane No��e
rass
Notes:
"Tlre March-April a�itcogen application may not be needed if priar fall fertilization was completed. If sprin�green-
up acad growtl�is satisfactory,delay fertiliziug to May or Ju�ie.
� gApplication rates may be reduced by 114 to 1/3 wheza grass clippings are left o�i the]a�vn.
� �On very sai3dy soits do not fertilize turf after late September to prevent i�itrogea� fr'om leacll'[ng i��to groundwater
[ during tlae winter moiatl�s.
[ °Apply when tlie grass is s[ill green and at least 2-3 weeks prior tn the ground fi•eezing. Optional nitroge��
� applications are indicated for use wE�ere higlier quality or]ieavily-used turf is present.
�
� Source: T.Koski aaid V. Skimier,CSU Exiension,2003.
NnvemUer 2010 Urban Drainage aud F1ood Cont�ol District LM-3
Urban Starm Drainage Criteria Manual Volume 3
S-9 Landscape Ma�ntenance
■ If poss'sble, properly irrigate ttErf following fertilization to help grass utilize applied nutrients and to
minimize the potential Far fertilizer burn. Care should be taken to avoid excessive i��igation that
would result in fertilizer being washed away. Similarly, aWoid applicatioi7 of fertilizer immediately
prior to heavy rainfall.
■ �'all is Yhe best time of year to fertilize bluegrass lawns. Over-appticatioil of nitrogen fertilizer in
Apri[may cause grass to grow too fast before raots can stipport the growth, resulting in less heat
tolerance.
■ Generally, the Colorado Nursery and Greei3hause Associatio3l recommends waiting unti�the second
growing season to fcrtilize orname�ital(woody)pllnts. Commercial fertilizer should not be used in
the backfill where it comes in dircci contact witl�the roots.
■ Maintain a buffer zone arounc�wef�s or surface waterbadies where fertifizers are not applied to
minimize pollution. Consult the fertilizer product label ai�d local regulations and landscape
ordinances for appropriate distances. Researcl� ii� this area is limiteci; l�owevcr, CSU Extension
recotnmends a buffer of 6 to 1 Q feet for ntowed turf areas.
• In areas with sandy soils, it is particularly important to avnid over-application of fertilizer that could
leach into groundwater. These areas may E�c particularly well suited to slow-r�lease fer�il�zer fonns
an�conservative application rates.
Lawn Irrigation
■ The approximate ainount of water that needs ta be appiied each week far aii average,traditiona! lawn
to supplement no1-�nal rainfall is listed in Table 2. (Water utilities may provide additional guidance in
tcrms of sug�ested run-times for va�iaus sprinkler types; htt��:' �����ti.c_1_�r1�cr��acci�.c,r�� C un,�r�.�tiun'.}
Table LM-2, General Gnideline for Ap�roximate Sapplemental Water
for an Average Traditional Lawn (ir�ches�er week}
Condition3 A ril' Ma June JuI � Au Se t Oct2
Non-Drought
Conc�itioi7s I14" I" I%z" I%z" 1%4" 1" ll2"
During Drou��lt
Restrictions(approx.
20%reductien) 114" 3l4" 1'/4" 1%a" 1" 314" 112"
�For established lawns,water may not Ue required dLiriatg April. Base decision on weatf�er conditions.
z For estaUlished lawns,water is typically not required al'ter Oct 15.
3Under less-th�n-average rainPall co��ditions,the amaui�ts s��own in tl�e chart shoulc�be increased. If
there is greater-tlZan-Gaotmal raii�fall,then tf�e amou:it of supplemental wate�•should be reduced.
• Consult with the CSU Extension Turfgrass prograrn for recormnendations for irz-igating turfgrasses
with �ower water rec�uirements{e.g.blue gra�na,buffalo grass). For native grasses, in�igation may be
unnecessary or l�m�ted to certain conditians.
• Irrigate the lawn uniformly until the sail is moist to a depth of 4 to 6 inch�s to encourage deep roots.
Frec�uent,�ight sprinklings moisten oi11y the surface and cx�ay cause shallow-rooted turf and increase
weed seed gerniination. Properly maintain tYse irrigation system to ens�u'e that the irrigation is being
applied at appropriate z�ates and to the turfgrass,not the sidewalk.
Y,M-4 Urban Drainage and Flood Control District November 2010
Urbarz Storm Drainage Criteria Manual Volume 3
Landscape Main�enance ��-9
■ Maintain irrigation systems in good operating condition witt�unifoz-�n distribution of water. "Smart"
irrigation controIlers and weather sensors caEi reduce water waste by shutting off irrigation during
sform�vents and heiping owners water according to the needs of tlie plants ta replace water lost to
evapotranspiration(�T).
� Froper irrigation can minimize the amount of fer�ilizer and other chemicals that are leached below the
root zone of the grass or washed away by runoff.
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November 2010 Urban Drainage and Flood Cont�-ol District LM-5
Urban Stoz�z Drainage Criteria ManuaI VoIume 3
Silt Fence {SF) SC-1
Description ,
� �1; a �
A siEt fence is a woven geotextile fabric ' y ` '' � ��'r- ��' � �
attached to woaden posts and trenched � }� �� ' � � Y `1 �� � � ���
,
into the ground. It is designed as a �'� ,. �`�.�"��°�wb � ¢` �""`��Y� �`�
��
sediment barrier to intercept sheet#7ow `" _ . ' ,:.,�'-,".
runoff from disturbed areas. �-� . :`.,,y _,:
Appropriate Uses �
A silt fence can be used whcre runoff is ., � - , �� • - � ` . ',�a, " � ' -
. . , y . r ., .. ,
conveyed from a disturbed area as sheet _ �,'", � '
flow. Silt fence is not designecE to e r.� �;� � ' � �, �� ��v' 3 ��� � .= �' y�
receive concentrated flow or to be used :� : -�- �� �`` ��'" '�""�
.:. � .,'. � # ,� ti . r�.
as a filter fabric. Typical uses include: - _ .. _; ,
� °,�. �.
■ Down slopc of a dasturbed area to � "" �` � �� � "�' -- '��
3CC�pt S�1�Ct�OW. Phatograpft SF-l. Si[t fence creates a sedirnent barrier,farcing
sheel flow runoff to evaporate or infiltrate.
■ Along the perimeter of a recczving
water such as a stream,pond or
wetland.
■ At the perimeter of a canstruction site.
Design and Installation
Silt fence shouid be installed along the contour of slopes so that it intercepts sheet f�ow. The maxirnuzn
recommended tribucary drainage area pez 1001ineal feet of silt fence, installed along the contour, is
approximately 025 acres with a disturbed slope length of u�to 150 feet and a tributary slope gradicnt no
steeper than 3:1. Longer and steeper slopes require additianal measures. This recommendation only
applies to silt fence installed along the cantour. Silt fence installed for other uses,such as perim�tec
control, should be installed in a way that will not producc concentrated flows. For example, a"7-hook"
installation may be appropriate to force runoffto pond and evaporate or infiltrate in multiple areas rather
than concentrate and cause erosive canditions parallel ta the silt fence.
See Detaii SF-1 for proper silt fence installation,which involves proper trenching, staking, securing the
fabric to the stakes,and backf Iling the silt fence. Properly installed silt fence should not be easily pui�ed
out by hand and there shoald be no gaps between the ground and the fabric.
Silt fence must meet the minimum aliowable strength requirements, depth of installation requirement,and
other specifications in the design details. Improger installation
of silt fence is a cam�non reason for silt fence failure; however, Silt Fence
when properly installed and used for the appropriate purposes, it
can be highly effective. Funetions
Erosion Control No
Sediment Control Yes
Site/Material Mana ement No
November 2010 Urban Drainage and Flood Control District SF-1
Urban Storm Drainage Criteria Manual Volurne 3
SC-1 Silt Fence (SF)
Maintenance and Removal � �..�
�ri�-- "� -�"�,,�.�,+,
Inspectian of silt fence includes observing the
rnaterial for tears or holes and checking far slumping
fence and undercut areas bypassing flows. Repair of . _
silt fence typically involves replacing the damaged �
section with a new section. Sedim�nt accumulated ' �, �� :
bchind silt fcnce shou[d be removed, as needed to �,�, t �.'^����,� "�'w =�.�
maintain BMP effectiveness,typically before it � '.Y:�-.;� " '�:>�,,`!"�`,:�,_;..
reaches a depth of b inches. '' '��'����'f� r,�,,`�
;�fy, ,� ��:.•�
;- 1 �'Y tt1. '�
Siit fence may be rerr�oved when the upstreatn area ,� �� {4r"' ��� ����'��� i
has reached final stabilization. �r.,- � " �s�, �-��, 1���,,��r� �
.• -•r ,�v ,�
. s-��� ,�.a .M�. K?r� �!�n.�.f3��"y4' iir�':� .,:'._{i...
Photograph SF-2. When sill fence is not installe�3 alou�
the contour,a"J-hook"installation may 6e appropriate
to ensure tliat the BMP does not create conccntrated
tlow parallel ta the silt fence. Phbto couriesy of Ton�
G ore.
SP-2 Urban Drainage and Plood Control District November 2010
Urban Storm Drainage Criteria Manual Volume 3
Silt Fence (SFj SGl
SF-SF-SF ��
1 Y2,� x � �,.
(RECOMMENDED) VJQQpEN
; FENCE PQST wITH 70' MAX
; � SpaCiNG
1
� GEQTEXTII.E �_�
A
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� GOMPACTED
BACKFILL
�.�pw �.`-� 36°-48��
' --'-` _"`---.._.,,,� TYP.
� EXISTING ,1 �� �
GROUN[7
fi" M1N
�
RT LEAST 10" � �8
MIN
QF SI�.T FENCE
"TA1L" SHALL BE '��� MIN
� BURIEp
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SILT FENCE
POSTS SHALL OVERLAP
AT �301NT5 SO THAT NO GAPS
Jp�� £XIST IN SILf FE�ICE
FIftST
Ro�rAr�
SECQND
PDSTS SHALL BE J�INEO A5 T�ifCKNESS QF GEO�EXTILE HRS�
E SNOW�J, THEN ftOTATE� 190 OEG.
� IN DlRECTION SHOW�i AND �RNEN BEEN ExAGGERATEQ, TYP
� INT'0 TH� GRRUNQ
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Novemher 2010 Urban Drainage and FIood Control District SF-3
Urban Storm Drainage Criteria Manual Volume 3
SC-1 Sil� Fence (SF)
SILT FENCE INSTALLATION NOTES
7. SII.T FENCE MUST BE PLACED AVlAY FROM THE TOE OF 7HE 5LOPE TO ALLQYd FpR 1NATER
PONQING. 51LT FENCE AT THE TOE OF A SL�RE SMOUL[? B� INSTALI.Eq IN A FLAT LOCATION
AT LEAST SEVERAL FEET (2-5 FT) FROM i'HE TO£ Or THE SLOPE TO AL,LRW RpQM FQR
PnN�1NG AN� L1�p�SIT1QN,
2. A UNIFORM 8" X 4" ANCHQR TREiVCH 5MALL BE �XCAVATEp USING �RENCHER OR SILT
FEI�CE INSTALLATION S7EVICE. HCi f20AD GRADERS, EACKHQES, OR StMILAR EQUIPMENT 5HAL�
8E USE�,
3. C(3MPACT Ar1CHOR 7ftENCM 6Y HANO WfTH A "JUMPItVG JACK" aR BY WHEEL ROLLING.
C(7MPACTION SHALf� 8E SUGH THAT SILT FENCE RE5ISTS BE1NG PULIE� OU7 OF ANCHOR
��E TRENCH BY HAND.
4. SILT FENCE SHALL 8E PULLED TIGHT A5 IT' 15 ANCHqREp TQ THE STP.KES. THERE StiOUL�
BE NO NOTICEABLE $AG BETWEEN STAKES AFTER IT HAS BEEN AI�CHOREO TO THE STAKES.
5. SII�'f F'�NC� FABRIC SHALL 8E AM1tCMORE❑ TD THE STAKES U51NG 1" HEAVY �UiY STAPLES
OR NAILS 4diTM t" HEA�S. STAPLES ANn NAILS SF30UL4 8E Pl,�ACED 3" ALONG THE FABRIC
� DOWN THE STAKE.
6, AT TH� �Np QF' A RUN OF StLT FENCE ALC}NG A CflNT�UR, THE 51LT F'ENCE 5HQUL0 �E
7URNED PERPENOICULAR TO THE CQNTOUR TQ CREATE ,4 "J—HOOEC." THE "J--HOOK"
EX��NQiNG PERPENDICUI..AR TO THE CONr�UR SNOULD HE QF SUFFICI�NT [.ENGI'Fi TQ KEEP
RUNOFF FRQM FLOVYING AR4UND TH� ENp QF 3HE 51LT FENCE (TYRICA�LY 10' — 20').
7. SILT FENCE SHALL 8E INSTALLED PRIQR TO ANY LAND OISTURBIRfG AC3IVITIES.
g SILi FENCE t�iA1NTEiVRNCE NOTES
1. INSPECT BMPs ERCH WORKOAY, APfO MAINFAIN TNEM IN E�'FECTkV� QpERATI�dG CONDITIQN.
h�AINTENANCE 6F HMPs SHQUL� BE PROACI'IV�, NOT" REACTIVE. ft�SPECT BMPs AS 500N AS
P05SIBLE (RND ALWAYS 4VITHIN 24 HOIiRS) FOLLOWING A STORM THAT CAl15ES SURFACE
EROSION, AN� RERFORM NECESSARY h4AINTENANCE.
2. FftEQUEt�T OB5ERVA'fiONS ANp MAINTENANCE AR� NECESSRRY TO MAINTAIN BMPs IN
EFFECTIV� Q?ERATIt�G �ONDfFION. INSPECTIQNS AI�D CORRECTIII� MfASEJR�S SHOULD HE
DQCUMENTED TNOROUGHlY.
3, ti�tiER� Bh�Ps HAVE FA�LEQ, REPAIR OR REPlACEMENT 5HOULD 8E INITIAT�D UP[1N
D]SCQV�RY OF rHE FAILURE.
� 4. SEDIMEiVT ACCL1MLfLA"fEb CEPSTREANI QF THE SILT FENCE SHAtL BE REh10VED AS NEf�£6
TO {ytA1NTAIN THE fUNCTIONALiTY OF THE BhiP, TYPICALLY WHEN QEPTH OF ACCU�IULAT�b
� SEDIMEMTS IS APPROXIMATELY 6".
� 5. REPAIR QR REPLACE SILT FEt�CE WHEN THERE ARE SIGNS OF 1NEAR, SUCH AS SAGGING,
TEARING, OR COL�n.PSE.
s
� 6. SILT FENCE IS TO REMAIN IN PLACE UNTIL THE U�STREAM DISFURB�[� AREA IS STA61i.IZED
E
� AND APPRQVE� BY THE LOCRL JURIS�ICTION, Oft IS REPLACE[] 6Y AI� EQllIVALE�#T PERIMETER
; SEDIMENT CONTROL BMP.
E
i 7. WHEN SILT FE{VCE IS REt�OVEQ, ALL ol5€iJRBED AREAS SHALt 8� CQVERER WfTH TOPSdIL,
I SEEDE[3,ANO MULCHEO OR OTHERWISE STA81LfZE� AS APPROV�p BY LOCRL JURISDIGTI(3N.
E
� ((3£TAIL PDAPY'£b f'RON T6WN OF PARKER, COLORA60 AN❑ CITY QF AUR6RA, hFDT AVWLABLE IN AUTQGn)
` NOTE: MANY Jl1RtS�ICTIONS NAVE 8MP DETAIL5 THA� VARY FRflM UD�'GO STANpARp DETA[LS.
; CONSULT WI7H LnCAL JURISDICTIqNS AS Tp WFiICH OETAlL SHOUL� BE USED NlHEN
( qIF'FERENCES RRE t�QTED.
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S�'-4 Urban Drainage and Flaod Control District Noveznbez 2,01 D
Urban Storm Drainage Criferia Manual Voluzn€e 3
Rock Sock {RS} SC-5
Descri tion ' ` � + "
p , f{�"�;� ,� r���,{ f�r � 1;-
' , � �� �, s �1' ��! { r sr ��
� �
,. �f� M,�. r � f,. f t4i ' �s:_.
A rock sock is constn.Gcted of gravel ;��ir rs ,�:�o ��1� ��,'�� ` � �� �� � �
that l�as been wrappcd by wire rnesh or � ��`+' �' ,� r � 1� '� '
`� � '� 1 � �' f
� ,, , ? �1,
a geo tex ti le to form an e longa te d f�4,���` ;t�,��f��'�:' j F�,,��. � . 1+� 3��.`��'� -.
c lindrical filter. Rock socks are !�� ' �`: ' �: '�'`'� r � ' ' �`
y :�, ;�, , ,+� , J►�,��, i � r�kw s�`►�+ r y1�:.- .....
typicaily used either as a perirneter i�;�.�` �;s,�w � '! ������` t F�^ " „
control or as part of inlct protection. iv.:���,r'4� � s¢`'' *,w7��r��,,�:��r��',.: �,��.
When placed at angles in the curb line, � i�,�'��`� i'%"� i�� a� �+it � ',�'�;.
:i, ��:i� f] ,_ �,�� �,�Yt�,._�
rock socks are typically referred to as � �"�'� � �*fr'.•• ,�
�� �r�'` c' %, 1f� ;,.
curb socks. Roc3c socks are intended to �.+�1.;��,w,�• � ,._�:��` �
,� , ,�.
h'ap sediment from stormwater runoff '�y��°��'e�; "-_`_ - __ �'-�"-.
. _ ,
, .. _..�
� .. �.� _ .
that flows onto raadways as a result of ' "
� , � . . - ....
construction activities. ; � �
��, �-__�... _ ____ __. _. ---.. _
Appropriate Uses .. . _ .... ,.. `
Photograph i2S-1. Rock socks placed at re�ular intervals in a curb
Rock spcks can be USeL1 at the pet'lmeter line can help reduce sediment loading to storm sewer inlets. Rock
of a disturbed area to cantrol locaGzed sacks can a�so be used as perimeter conirols.
sediment loading. A benefit of rock
socks as opposed to other perimetez controls is that they do not ha�e to be trenched or sta�Ced into the
ground; thercfore,they are often used on roadway constreiction projects where paved surfaces are pr�sent.
Use rocfc socks in inlet protection applications when the construction of a roadway is substantially
corttplete and the raadway has bcen directly connected to a reeeiving siorm system.
Design and Installation
When rock socks arc used as perimeter controls,the maximum recommended tributary drainage area per
1041ineal feet of rock socks is approxizxiately 0.25 acres with disturbed slape length of up to 150 feet and
a trihutary slope gradient no steeper than 3:1. A rock sock design detail and notes are provided in Detail
RS-1. Also see the Fnlet Protection�'act Sheet For design and installation guidance when rnck socks are
used far inl�t proteetion and in the curb line.
When placed in the gutter adjacent to a curb,rock socks should protrude no more than two feet from the
curb in order for traffic to pass safeiy. Tf located in a high traffic area,place construction markers to alert
drivers and stree�maintenance workers of their presence.
Maintenance and itemoval
Rock socks are susceptihle to displacement and breaking due ta vehicle traffic. Inspect rack socks for
damage and repair or replaee as necessary, Remove sediment by sweeping or vacuuming as needed to
maintain the functionality of the BMP,ty�ically when sediment
has acc�mulated hehind the rock sock to one-half of the sock's Rock Sock
height.
Functions
Onee upstream stabiGzation is complete,rock socks and Brosion Control No
accumulated sediment should be removed and properly disposed. Sediment Control Yes
Site/Material Mana ement No
No�ember 2010 Urban Drainage and k'lood Control District RS-1
Urban Storm Drainage Criteria Manua]Volume 3
SC-5 Rock Sock {RS)
�����.• x�,.��,��.,;,.�-a-� 1�J
-�:����.�
7Y2" (MINUS} CRUSHED RQCK
E�fCLOS�� IN WIR� MESH 1�" (MINUSJ CRl€SH��1 RpCK
�NC�.pSER IN V'lIRE MESH
; WtRE TlE EN�S �
E
� ,�,--� , r-:���� �` "°
-�� �'-�. "��-'��� ���-c�-�,,�
4 �.��.���-��:. -'�:��-�:�'����,��-+�"�
— — '�-L�%���"�'���-�:� �---�' "�-�" <_ *' . -
k" TO 6" MAX AT
� 0" ON BE�RaCK OR GROIitV�7 SURF'AC� � CUR9�, QTHERWISE
HARO SURFACE, 2" 6"-1�" DEPENOWG
IN SOIL QN EXPECTED
� SE�IM�NT LOA�S
� ROCK S�CK SECTI�N ROCK SOCK Pf�.AN
J
z
ANY GAP AT JflINT SHALL BE FILLED WITH AN AQ�QUATE
AMOUNT QF 1}�" (MINU5) CRUSHED ROCK AND WRAPP�b
WITH AOLIITIONAL 4YIRE MESH SECUR�t1 i'p �NpS pF ROCK
� RpCK SQGK, REINFOf2CED SDCK. AS RN ALl"�RNATIV� TO fILLING ,ialNTS
� NP BETWEEN A�JOINING RpCY SQCKS WITH CRUSNED ROCK AND
= 32" 12" AS]DITIONAL W1RE 1'lRAPPIAIG, ROCK SiSCKS CAN B�
� QVERLAPPEO {�YPICALLY 12-INCH OVERLAP) TO AV010 GAPS.
�
s , . .
7 :��rLX-�„ .. � �- � -'__�-W'
�-�v��y. ,�� ��; �;�'t����'��� Gi�AOATdON TABLE
„.�;�,,,r.
SIEV� Si�� �ASS ?ERCENT PASSING
5QU�RE MESH SIEVES
ROCK SOCK .�0(NTING NO. 4
2 100
13z" 90 - 3 b0
�'� 2Q - 55
�i'a„ 0 - 15
3��. Q — �
B
! ROCK SQCK IPfSTALLATIQN NQTES MRTC€iES SPECIFiCAT14NS F4R N0. 4
� COARSE AGGREGA7E FOR CONCRETE
1. SEE PL,4N Vi�w FOR: PER AAShiT� M43. ALL ROCK SMRLL SE
� -LOCATION(S} OF ROCK 5pCK$. FRACTUREO FACE, ALL 510E5.
E 2. CRU5NED ROCK SNALL 6E i�§" (h41NU5) IN 51Z� W€�'H A �'RACTt�REO FACE (ALL SEDES)
ANfl 5HALL COMPLY N11TH GRAf]AT1pN SHQWN ON TNIS SHEET {1�" A31NUS�.
� 3. WIRE NiESH SHALL BE FABRICATED OF 30 GAG� POUL7RY �1ESH. OR EQUIVALEM1€T, 4VITH A
MAXIMUM OPENING 4F' Yz", RECOMh�ENDED MINIMUM ROLL WIDTH OF 48�
4. WIRE MESH SHALL BE SECURED USING "HOG RiNGS" OR VlIR� T1ES AT 8" CEPlTEftS
� ALQNG A�.L JOlt��S ANO AT 2" CENtERS QN ENpS OF SaCKS.
I
j 5, SQM� NUNfClPAL1FIES MAY ALl.OW THE USE OF FIL�ER FABRIC AS AN ALTERNATIVE Ta WIRE
� MESfi FOR THE ROCK ENCL05URE.
E RS-1 . ROCK 50CK PERIM�T�R CONTROL
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RS-2 Urban Drainage and Flood Control District Novezniber 2010
Urban Storm Drainage Criteria Manual Volu�e 3
Rock Sock (RS} SC-5
Rt�C1C.,_,SS�C;K h{AINTENANC� NOTES
1. INSPECT BMIPs EACH WQRKDAY, AtVp A�AINTAW iHEM IN EFFECTIVE OPERA32NG CONpiTIQN.
; MAf�€T�NANCE OF BMPs SHpULt] 8E PROACTIVE, NOT R�ACTIVE. IN5PEGT Bt�Ps AS �fl�N AS
P055EBLE (AN1] ALWAYS 1tJITHIN 24 WOURS) FC3LLOWtI�G A STQRM THAT CAUS�S SURFACE
ERaSiON, ANO PERFORM N�C�SSARY A�AINT�NAt�CE.
2. FRE4UENT OBSERVA�I(3NS AND h4AINTENANCE ARE N�CESSARY TO h4AtNTAIN Bh4Ps IN
EFFECTIVE OPERA3fNG CONDITION. INSPECTIQNS ANQ CORRECTIVE AiEA5UR�5 SHOULD SE
ppCIJMENTEII THOR�UGHLY.
€ 3. WHERE BMPs HRVE FA[LED, REPAIR OR R�Pf„ACEME€dT SHaULQ BE INITtATED UPON
i �]ISCOVERY OF THE FP3i.lfftE.
�-, ftOCK SOCKS SHALI BE REPlACED I� T'HEY B�CQA4E HEAVILY SOILE€], OR OAMAGEO
BEYOND REPAIR.
�. SED3MENT ACCUMULATED URSTREAM 0�' f2C1CK SQGKS SHALL BE REMOVE� AS NEEDE� TO
�iRINTAIN FUNCTIONRtiTY OF TME BMP, TYPICALE,Y WHEN DEPTH OF ACCUNtULATEO SEOIMENT5
c5 APPROXI�AATEL.Y !$ OF THE HE[GHT OF THE ROCK SOCK.
3 6. RflCK SOCftS ARE i'0 REMAIN Ih[ PI_A,CE UIVTIL THE 11PSTREANt ��STURHED ARER tS
z STABIC.1ZEp ANA APPROVED BY THE LOGAL JURISDIC7'ION.
�
� 7. WHEhi ROCK SOCKS Aft� REMObEO, ALI. 1715TUR8ED AREAS SNALL BE COVEftED 1NITH
TQPSQII.. SEERED AND MULCHED OR OTHEftW]SE 5TABILI�E� AS APPROVED 8Y LOCAL
J�1RiSDICTION.
(6ETNL hnAPTED FfttlFd 1'qWN QF PAt{}C£R, C�LORAQQ AN6 C€7Y Of RURORR, COLOftROQ, NO'f AVA1Lt�LE IN AU7aCAp)
� � MA�tY JURIS�ICFfONS HAVE BN1P DETAILS THAT VARY F"RpM UpFCp STANOAR� DETAIL�
� CON5t1LT WiTti LOCAL JUftISDiCT[ON5 AS 70 WH1CH qETR1L SHOULD BE USE�I WHEN
� DIFFERENCES ARE NOTED.
NOTE: Tii� i]ETAILS INCLUf3E0 W[Tht Tt�IS FRCT SH�E�` SHpW COMMONLY tiS£D, CONVENTIONAL
METHODS OF RC3CK SOCK INS7ALLATION ]N TH� IIENVER METR(3POLITAN AREA. THERE ARE
MANY QTHER S(MILAR PROPRIETARY PRODUCTS ON THE MARKET. UCIFC� NEiiH�ft NDORSES
NOR DISCOURAGES USE OF PRDPRIETARY PROTECT#4N PRO(7UCTS; HOVJEV�R, IN THE EVENT'
PROPRIETARY METHODS ARE IiSEQ, THE APPROPR[ATE Q�TAIL FROM THE MA{VUFACTURER ML{5T
8E IHCLUdED IN ThiE 5WMP ANd TH� BhAA MUST BE INSTRLlED AND �AAINTAtNED A5 SH01VN
iN TH� MANUF'ACTURER`S DETAILS.
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November 2QJ 0 Urban Drainage and Flood Control District RS-3
I7rban Storm Drainage Criteria Manual Volume 3
Inlet Protect�on (IP) SC-6
Description -
Inlet protection consists of permcable �°-�^�"-"�»'-�`;.»�-�'-''""""'_'--�-��'.�---�•�;,,,..,�r;,�..;,�-_...R_
bamers installed around an inlet to ��°'"`�„ '�""'�'�-}��x��_�:.�' . �
filter ruraoff and remove sediment prior � ��
to entering a storm drain inlct. Intet '
protection can be constructed from rock � � `-
�,s
socks,sediment control logs,silt fence,
black and rock socks,or other materials
a�proved by the [ocal jurisdiction.
Area inlets can also be protected by '
over-excavating around the inlet to
form a sediment trap. �
� t��
Appropriate Uses � `?'
,_�-,;:
A:s.�.
.�,,,��
install protection at storzn sewer inlets �� '
tl�at are operable during construction. Pl�atograph CP-1. inie�procecc;o� to��a curb opening inlet.
Consider the potential for tracked-ont
scdiment or temporary stockpiie areas to contribute sediment to inlets when deterrnining which inlets
must be protected. This may include inlets in the gencral proximity of the construction area,not limited
to downgradient inlets. Inlet protection is not a stand-aione BMP and should be used in conjunction with
other upgradient BMPs.
Design and Installation
To function effectively, inlct protection measures must be installed to ensure that flows do not bypass the
inlet protection and enter the storm drain without treatment. However,designs must also enable the inlet
to functian without completefy blocking flows into the inlet in a manner that causes localized flooding.
When selecting the type of inlet protection, consider factors such as type of inlet(e.g., curb or area,sump
or on-grade conditions),traffic,anticipated f�ows,ability to secure the BMP properiy,safety and other
site-specific conditions. For example,block and rock socks will be better suited to a curb and gu�ter
along a roadway,as opposed to silt fence or sediment control]ogs,which cannot be properly secured.in a
curb and gutter setting,but are effective area inlet protection measures.
Several inlet protection designs are provided in the Design Details. Additionally,a variety af proprietary
products are available for inlet pratection that may be approved for use by lacal governments. If
proprietary products are used, design details and instaliation procedures from the manufacturcr must be
followed. Regardless of the type of inlet protection selected,inlet protection is most effective when
combined with other BMPs such as curb socks anc{check dams. Inlet pratection is often thc last barrier
before runoff enters the storm sewer or receiving water.
Design details with notes are provided for these forms of inlet ��►�et Protectian
protection: (various formsj
�'unctions
IP-1. Block and Rock Sock Inlet Pratection for S�mp or On-grade �rosion Control No
Inlets
Sediment Control Yes
IP-2. Curb (Rock) Socks Upstream of Inlet Protection, On-grade Site/Material Mana ement No
Inlets
August 2013 Urban Drainage and Flood Con�rol District If'-1
Urban Storm Drainage Cnteria Manual Volu�ne 3
SC-6 Inlet Protection {IP)
IE'-3. Rock Sock In.let�'rotection for Sump/Area Inlet
IF-4. SiIt Fence Inlet Protection for Sump/Area Inlet
IP-5. Over-excavation�niet Pratection
i
IP-6. Straw Bale Inlet Protectian for Sump/Area Inlet
;
CIP-1. Culvert Inlet Protectiou
�'ropri�ty inl�t protection devices shouid be installed in accordance with znanufacturer specifications.
� More infarmafion is provid�d below on selecting inlet protection for sump and on-grade Ioeatinns.
�
Inlets Located in a Sump
VVh�en applying inlet prot�ction in sump canditions, it is im�ortant that the izalet cantinue to functian
'� during larger runaff events. For curb inlets,the maximum height of the protective barrier should be lower
; than#he top of fihe curb opening to allaw o�erflow into the inlet during larger storms rx�ithput excessiv�
localized flooding. If the inlet protection height is greater than#h�cur6 elevatian,paz-ticulariy if the filter
becomes ciogged with sediment,ninoff will not enter�he inlet and may bypass it,possibly causing
lacatized flooding,pubiic safety issues,and dowmst�eann ezosion and damage from bypassed tlows.
Area inlets located iri a sump setting can be protected through the use of silt fence,concrete block and
E roc�socks (on paved surfaces),sediment cantroi lags/stza�v wattles embedded in t)ie adjacent soii and
�
s stacked around Ehe area inlet(on pervipus surfaces),over-excavation around the inI�t,and proprietary
�
� prqducts pzoviciing equivalent functions.
Infets Located on a Slape
For curb and gutter inIets on paved sloping streets,black and zoc�C sock inIet protectian is reconvnended
in conjunction with curb socks in the gutt�r leading to the inlet. For inleEs located along unpaved roads,
aIso see the Check D�n�'act Sheet.
Maintenance and Removax
Inspect iniet protection frequently. Inspection and maintenance guzdance includes:
� ■ Tnspect for tears tk�a�can resuIt in sediment directly entering the inlet,as w�kl as result in the contents
e of th�BMP(e.g.,gravel}washing into the inlet.
�
g ■ Check for improp�r installation resulting in untreated�ows bypassing the BMP and directIy entezing
the inlet or bypassing to an uz�prot�cted downstream inlet. For example, siit fence that has not been
propezly tzenched around the iniet can result in flows under the silt fen.ce and directly into the inlet.
■ Look for displaced BMYs that are no longer protecting the inlet. DispIacement may accur followin�g
larger starm events#hat wash a�vay or reposition the inlet protectian. Traffic or equip�raent may also
; crush or displace the BMP.
€
€ ■ Monitor sediment accumulation upgradienr of the inlet protection.
[
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�
', Il'-2 Urban Drainage and�'lood Control District August 2013
Urban Storm Drainage Criteria Manual Volnme 3
Inlet Protect�on {IP) SC-6
■ Remove sediment accumulation frorxz the area upstream of the inlet prot�cfion,as needed to maintain
BMP efFectiveness,typically when it reaches no more than half the storage capacity of the inlet
protection. For silt fence,remove sediment when it accumuIates to a depth of no more than 6 inches.
Remave sediment accumulation frorn the area upstream of the inlet protection as needed to maintain
the funcfiionaiity of the BMP.
1
� ■ Propriety inlet protection devices shouid b�inspected and maintained in accordance with
manufacturer speci�eations. If proprietary inlet znsert devices are used,sediment should be removed
in a timely mannez to pzevent de�ices from breaking and spilling sediment into tl�e stonm drain.
Inlet protection must be removed and properly dispqsed af when tk�e clrainage area for the inlet has
r�ached final stabiIization.
€
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E August 20I3 Urban Drainage and Flppd Coni�ol District IP-3
! Urban Sto�Drainage Criteria Manual VoIume 3
�
€
SC-6 Inlet Pro�ection (IP}
IP
�
s�€ Roc� sacK n�sicr�
���� lIETAlL FOft JOINTING ROCK
SOCKS 16" CI#V��R 1 E" CINDER SOCKS
Y, ,., BLOCKS BLQCKS
-� .;-;��-i i r `rr,�a"� 'zr'��+ f� �r F'LOW �f 0 �
" �.:- �;�,�•
� �
�- s <
� . , . ° 2'x4" WOOD STUD
m�
, ��.� t.�,:t,_�,�� ,xt"�.a;�"1 MIAJI CURB INLET `
i 2"x4" WQOD — 5ECTION A —
STUQ
IP-1 . BLOCK AND RQCK SQCK SUMP OR ON GRADE
INLET PROTECT[ON
;
'� BLOCK ANR C�lRB SOCK INLET PRaTECTiC]N fNSTALLP,TI�N N07ES
`3 t. SEE R�CK SOCK DESIGtd DE7AIL FQFt INSTAI.t�,TIpN REQUIRE�AENTS.
2. CONCREi'E "ClNDER" �LOCKS SHALL BE LAIa Otd THE[f2 51p�S AROiI#VD THE INLET IN R
S3NGLE RQW, ABUiTING ONE ANOTH�R W1TH THE QFEN EN� FACI�fG AtNAY FftOM THE GURB.
3. GRAVEL BAGS SHALL BE P�ACED AftOUN� CONCR�TE BLC�GKS, CL05ELY ABUTTING ONE
4 AN�THER f�lVD JOIIdTED TDGETHER tN ACCdRDANCE VJ1TH RQCK SDCK C7ESIGN DETAIE..
� M1iV9hAUM OF
� i'WQ CURB
50CKS ppp�p;� �p p�G. BLOCK AiVD ROCK SQCK fNLET
� PRO7ECTfON{SEE DETAIL IP--t)
� @ti.. @�.. m
� !�t��'-,�. _,..�, _ kr'"�n,.
�i- -a �!,,.��.3=�-> ;s-��
� CURB SOCK ,x ��� f� r�.
� fLt3W —� �i�� � ��s; ,� -�-.� �,,,�,��,r��'' �`„�=.�'a.
�'^�,��,. �-y�,�,�,�.,���;r-�,�,��,� -"'�,.' ;�.
5' M1N 3'-5' TYP.
IP-2. CURB ROCK SOCKS UPSTREAM OF
INLET PROTECTION
C3JR6 ROCK SOCK €NLET PRQTECTIpN [NSTALLATION N4TE5
i
1. SEE RflCK SC1CK p�S1G�E [}ETAi�. INSTALLATION RE�UIREMENTS.
€
i 2. PI..ACEMENT 0�' THE SOCK SHALL 8E APPROXIMATELY 30 dEGRE�S �ROM PERPENtJICIlLAR
IN ThIE OPPOSITE DIRECTION aF FL4W,
I
� 3. SQCKS ARE TQ BE FLUSH W€TH THE CURB AND SPACED A Mfl�Itv1UM 0�" 5 f EET APART,
�
€ 4. AT LERST NJO CURB SQCKS [�! SER[ES ARE REQUIRED UPSTREA�� QF ON—GRADE INLET5.
[
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IP-�F Ilrban Drainage and Flood Control District Augn€st 20I3
Urban Storm Drainage Criteria Manual Volume 3
Inlet Protection (IP) SC-6
� �,,,. ;��``�I����-��rtz � 1NLET �RATE I I�
�'�. -,,Y_ �.<�, �,��,�
����� � .a���
� �'.�; ��
J ��; ;��
"=� ��; SEE l20CK 50CK DETAtL
;�r,�, 'd�`��'-.;� � FOR ,]OfNTING
) `:��
�'�'�` rr��i.,
ROCK SQCK ��` ����°��
��� ��a;9
;a;� �.��
>
�t �� �
7,,�-.��'����x!�-,���`
� .
�
IP--3. RQCK SOGK SUMP AREA INLET PR4TECTION
� Rpc�___snGx sun��/a��a �N�.�r �Rar�cria
N Ihf,�TAL(,;ATION N07£S
� 1. 5EE ROCIf SOCK DESIGN DETAIL F"OR INSTAL�ATIQN REQUIREMENTS.
�
� 2. STRAW WAT7LES/SEDIMEN7 CONTROL LOGS MAY BE USE€� II� PLAC� QF R�CK SCICKS FOR
fNt��TS IN PERVIOl3S AREA5, tNSTALL PER SE�IMENT CC3NTR{3l. LOG OEFAIL.
� INLEF GRATE
�gF� _..
g N❑� SII.T FENCE {SEE SILT
I �5F� F"ENC£ QESIGN pETAii. }
IP-4. SILT FENCE FOR SUMP INLET PROTECTIDN
€
€
i
SILT FENCE INLET PROTECTION INSTALLA710N N�TES
; 1. SEE SILT FENCE OEStGN flETAlL FOR INSTALLATION REQUIR�ME�ITS.
2. POSTS 5MALL 6E PLACEp RT EACH CORNER DF THE INLET AND ARQUN❑ THE EpGES
F
RT A MAXIMUM SPRCING OF 3 FEEC.
E
� 3. ST'RAN! WATTf�ES/SEDf�1ENT CONTROL LOGS MAY BE USED IN PLACE pF SILT FENCE FOft
, INLETS IN PERVIOUS AREAS. INSTALL PER SEDIMENT CQNTRQL LOG DEFAIL.
f
F
August 2013 Urban Drainage and Fiood Controi District Il'-S
Urban Stoz�rn Drainage Criteria Manual Valume 3
SC-� In�eti Protection (IP}
51LT I P
FENCE
; � � � AREA
� INtE�C
� I I
SHEET S13.T
FLOW i i FENGE
ECB
2:1 MAX
� �1--. � 1 �3 1' MIN
— AREA 2� MAX
� � ��� INLEF �
ROGK FI�.TER � CONCEI�TRATED
QR ROCK SOCK FLOW
(USE IF F'LOW
I5 CONCENTRATE4}
� IP--5. QVEREXCAVATiON INL�T PROTECTION
� OVEREXCAVATIGN IN�ET Pf;pTECTION ENSTALLATI�N NO7ES
t. THIS FORM QF INi.ET PROTECTIO3V [S PRIMAftILY APPLiCA6LE F"OR S3TES THAT HAVE NflT'
YET' REACHED FINAL GRAOE AN� SF30UL0 HE USED QNLY FOR fNLETS tNITH A REL4TNELY
Sh4AL� CONTRIBU�fNG DRAINAG� AREA,
2. WH�N USING FaR CONCENTRATED FLflWS, SHAPE BASIN IN 2;1 RA71Q WITH LENGTH
£ QRtENTEp Tp4VAftnS �IRECTI�N OF FtOW.
� 3. S�pfM�NT t�[UST 8E PERIDDfCALLY REMOVED FROM THE OVEF2�XCAVAT�D AREA.
�
0 0 0 o INLEI GRATE
a a
a a
STRA4V 6ALE (SEE STRAW ° °
8ALE OESIGN DETAIL)
y O q tl o p
6
�
I fP�-6. STRAW BALE F"OR SUMP fNL�T PROTECTION
E
$TRA4V �AI.�_BARRI�R IN�k'T' PR07ECTIfJN INSFALIATIQN NDTES
1. 5EE STRAW SAIE DESIGN DE�AIL F'OR INSTAI.GATION REQU€RE�IENTS.
2, 6ALE5 ShiALL BE PLACED IN A 51NGLE RC1sN AROUN6 THE INLET Wli'H ENf�S OF BRLES
�
T[GHTLY ABUTFEI�G ONE ANOTHER.
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IP-6 Urban Dzainage and Fiood Control District August 2013
Urban 5torm Drainage Crif�ria Manual Voluzne 3
Inlet Protection {IP) SC-6
P
.�� CIP
; �:
i
�"�" L
��� �LQW —�-
�'; 8 �D (12" MIN.) �
�:��:,
s r�„�: �.'.� -� � m ;-};
�;_;
CUI.VERT
m ��
'�� END SEC7[ON
''` BACKF'ILL UPSTREAM ROCK
������..
m�� RflCK SQC3< OF W1ATfL� SflCK
:s
-9
CULVERT INLET PROTECTlON SECTION A
' PLAN �- ,o° r�i�v.
� �—:��.
f
KEY IN ROCK SOCK 0° f3N BEDROCK, PAVEAAEN7 OR RIPRAP
K�' IN ftQCK SOCK 2" {3N EARTH
� SECTI0�1 B
�
� CIP-1 . CULV�RT [NL�T PROTECTION
S:t�t y�BT �I��T PROTECTION tNSTALLAT1Qiv NQ7ES
1. SEE PLAN VtE�d fOR
—LOCAT30N 4F CULVER7 INLEI' PROTECI'If1N.
2. SEE RaCK SOCK DESIGfV DETAIL FOft ftOCK GRADA710N R£4UIREh4ENTS AND Jp1NTiNG
DETAIL.
CLILVERT INLET PRQTECTIQN h�4AINTENANCE #V(3TE5
1. [NS?ECT 8A4Ps EACH WORKaAY, AiVD A�RINTAiN TH�M IN EF�ECTIVE OPERATING CON�iTiaN.
MA1N1'ENANCE OF BMPs SNOULD BE PROACTIVE, NF3T REACTIVE. IIVSPECT BMPs AS SOO�f AS
g P€�5Si81�E (ANp ALwAYS W1TN1N 24 HOURS) FOLLQWIfdG A STORM 7HAT CAUSES StIRFACE
g ER4510N, A�lD PERFORht N�C�55ARY MAINT�NANCE.
� 2. FftEQUENT OBSERVATIOIVS AND MAINTENAt�EC� ARE N�CESSARY TA MAINTAIN BMPs IN
� EFFEC3SVE OPERATING CONDITION. INSPECTIQNS AiVp CpRRECTIVE ?�EASURES SHOULD BE
�OCUlaS�iVTE[3 THQRpUGH[.Y.
3. WHERE BMAs HAVE FAILED, REPAIR DR REPLACEMENT SHOULD 8E SNITIATED UPON
DISCOVERY OF TH� F"RlLURE.
4_ S�D[A1ENi' ACCUMUUiTE[] UPSTRFAP=i OF THE CULVERT SNALL 8E REMOVEO VJHEN TFiE
SEDIMENT DEP7'H t5 !� THE IiE[GHT p� TH� ROCK SQCK.
�
� 5. Cl1LVERT €hILET PROTECTION SHALL 3�ER4AIN [N PLAC� ISNTiL THE UPSTREAM piSTURBED
AREA IS PERMANENTLY ST'A81LfZE� ARlD APPRC3VEp 8Y iHE LQCAL JUR1503CTION.
[ (6ETA1L5 AOAPfEO FR4M AVRORA, C(ILORA40, MOT AVRILABLE !fJ ALf�dCFD)
� �OTE: MANY JURlSDICTI�7NS HAVE BMP C3ETAILS THA7 VARY FRbM ll��CQ STAI�QARp pErAILS.
COfd51JLT W[Tti t�QCAL JURISiJIGTIpNS AS TO WHICH DEl"AfL SHOULfl BE liSEQ WHEN
CiIFFERENCES RRE NpTEq.
August 20l 3 Uzban Drainage and Flood Control District Il'-7
Urban Storm Drainage Criteria Manual Volume 3
SC-6 In�et Protection (IP)
GENERAL 1NLE€' PRQTECTION 1NSTAt_LATtON NOTFS
1. S�� PIAN VIE4Y FOft;
; —LOCA�'ION OF INLET PROTECTION.
—TYPE OF INL�T AROTECTION (IP.l, IP.2, iP,3, 1P.4. IP.5, IP.6}
2. INLET PROTECTI�N SHALL BE 1NS7ALLE� PROMPTLY AF-fER II�LET CONSTRIiCTION OR PAVING
� IS COMPLETE (TYPfGALLY 1NITHIN 48 HOUR5}. IF A R/l3NFAL.L/RUtdOFF El/EIJT IS FORECAST,
INSTALL INLET PROTEC�ION FR]OR Ti3 tlN$ET C3F EVENT.
3, �lAt�Y Jt1F215DIC�fflNS HAVE BMP OETAILS 3HAT VAftY FROM UOFCCI 5TANDRR[7 DETAILS,
CONSULT 4VITH LOCAt JLIRISDICTIOf�S AS TO WHiCH DETAiL SHpULp BE USED WHEN
�IFFERENCES AR� NOTEq.
iNLET PRpTECT1C}N ltiIRINT'ENANCE NOTE5
1. INSPECT BMPs EACH WQRKDAY, AND t�AINTAIN THEM IN EFFECTIVE OPERATING CONp179QN.
MAINTENANCE pF 6MPs SH�ULU 8E PftdACTIWE, N0�' REAC71V�. 1NSPCCT BMFs AS 500N AS
;i POSSIB�E (AN� ALINAYS V'JITHIN 24 FiOEIRS} FOLLOVJING A 5�ORM THAT CAUSES SURFACE
� ERQSIp€�, ANO PERFORAA NECE55ARY MAINTENAfVCE.
z 2. FRE�UENT OBS�RVATIflNS At�D MAfNTEN;4fdCE ARE NECESSAi�Y TO MAINTAIIV BMPs lN
EFFECTIVE OPERAFtNG CONDf1'14N, INSPECTIONS A�€0 CORRECTIVE hS�ASt1RES SHaiJLD BE
UOCUMENTEQ TFi0R0UCHLY.
3. WHERE BMPs HAVE FAILEp, REPAIR QR REPLACEMENT SHOULO BE [NI7IATED liPO�
° Dl5C�VERY OF THE FA1LURE.
�
� 4. SED]MENT ACCUti4ULATED UPSTR�,4hS 0�' INLET PROTECTION SHAIL BE REMOVED A5
N�CC55RRY 7'0 MAINTAII� 8MP EFFECTIVEN�SS, TYPECALLY �NHEN STORAGE VpLUME R�AChiES
5CJ% OF CAPACITY, A DEF''fH AF 6" 1VFiEN 51LT FENCE IS USED, OR Ys OF THE N�IGHT F"pR
STRAW HAl.ES.
5. INLE�' PRQi'ECT[Otd IS TO REAAAI�i IN PLACE UNTIL 7HE 13PS7REA�4 iIISTURBEp AREA IS
PERMANENTLY S�ABILIZ�D, UNL�55 7HE LpGAL JUftfSDICTION APRR4VES EARLIER R�MOVAL O�
INL�T PROT�CTION ft� STREET5.
S. WHEM12 INLET PROTECTION AT ARE,4 I�VLETS I5 REMOVED, fHE �iSTURBED AR�.4 SHALL 8E
COVERED W1TN ?'OP 501L., SE�DEp AI�1D 3�ULCHED, aR OTHERWISE STABILIZED IN A MANN�R
APPRDVEq 8Y TH� LQCAI. JURISDICTIOfv.
{DEtdIL FAM€EO FROhA TOriN OF PaRMER, CQ[.ORA00 RiJO [ITY OF AtJRqRn, COLQRAdO, N�T AYAILABLE IN nUTOCAfl}
�€QTE: MANY ,1Uft15DIC3[ONS HAVE BNP flETA[LS THAT VARY FROM [J[7FCD STANDARD DETAILS.
CONSULT WITH LOCAL Jl1RlSnIC71pNS AS TQ 1+1FiiCH DETAIL SHOIJLD BE USE� WHEN
01F'FERENCE5 AftE �€a�'E�i.
� NOTE: 7HE D�TAILS INCLUt]ED W1TH THIS �ACz 5H£ET SHOW COMMONLY USEp, CQNVENTlQNAL
METHODS OF INLET PROTECT[ON IN THE D�NVER �A�TROPOLITAN AREA. THERE ARE MANY
€ PROPftIETARY 1NLET PROTECTION A�ETHQDS ON THE MARKE7. iJDFCD NEITHER ENnOR5E9 NqR
I �ISCOtJRAGES USE OF PROPRIETARY fNLET PROT£CT10N; HQWEVER, 1N 7HE EVENT
PROPRIETARY i�4ETHODS ARE USED, THE APPROPR�AT� DE7A[L F'RpM THE MAfVUFACTURER MUST
6E I�€CLtI!]E�] IN THE S1miMP AND TNE BMP MUST BE INSTALLE� ANfl F�ASt�TAINED AS SHQWtv
� lN THE tr4ANUFACTI€R£R'S OETAELS.
[
€
� tVOrE: SOME �1tJiViCIPAL.lTI�S �ISCQURAGE OR PROHI8IT THE USE OF STRRW BALES FOR INC.ET
� PROT�CTIOIV. CHECK Wli'H LQCAt JURISQICT30N TO �E'i'EF2MINE IF ST'RAW BALE 1NLET
PRDTECTfON IS ACCEPTABLE.
i
i
Il'-8 Urban Drainage and Flood ControI Dis�ict August 20I3
Urban Storm Drainage Criteria Ma�ua!VoIume 3
Cons�ruc��on Fence (CF) SM-3
Description �,���, , �., . ,�,,., r,�
, �
A construction fence restr�cts site access '
-',.»
to designated entrances and exits, • _ -
deiineatcs construction site boundaries, � � { �� �+
and keeps construction out of sensitive �, .,�; ��a.�_�
areas such as natural areas to be � �s"���t � �.:'��._
preserved as open space,wetlands and � �: ,��� �r • � .
� ¢� '°'�
riparian areas. , • r,�!;k�� ;• ,
.� , I"
� ;.. �5.:: ;��r.,� �'�'�� � -
ti�.' ,. 1 � , .� i '� r � �7r�;
Appropr�ate U�es ,:�.�;�;��� ' , .�, ��, �; �. y . � .,
` ��. �'� .i� k ��� e� ` �.�: P
�r.'+�' ,.�' .� �� ~� ' i I�s�
Jk � �' _' . °�^ . �: . .} . � .
A construction fence can be used to '� � '�' �'� t �� �' ,�+.
delineate the site perimeter and [ocatiorts ���,�l�. 'x . tl �,���`�� .
�
within the site where access is restricted
to pratect natural resources such as Photpgraph CF-1. A coustrttction fence helps deline�te areas whci�e
existiiie vegetatin�i is heing protected. Pl�oto caurtesy of Dou�;las
wetlands,waterbodies,trees, and other ���ilty.
natural areas af the site that sl�ould not be
disturbed.
If natural resource protection is an oblcctive,then the construction fene'tng shouLd be used tt1 cotnbivaCion
with othcr perimetcr contro] BMFs such as silt fence, sedrment co�ltrol logs or similar measures.
Design and Installation
Const��uction fencing rriay be chain link or plastic mesh and should�e installed foIlowing manufacturer's
recommendations. See Detail CF-1 for typical installations.
Do noY�lace construction fencing in areas within work lianits of nlachinery.
Maintenance and Removal
• Inspect fEnccs for damage; repair or replace as necessary.
■ Fencing should be ti�ht anci any areas witli slumping or fallen posts should be reinstalled,
• Fencin�should be removec�ance constnlction is complete.
Construction�'ence
Funct�ans
Erosion Control Na
Sediment Conta'o] No
Site/Material Mana ement Yes
No�ember 20�0 Urban Dra�ilage and Floo� Coratz�ol District CF-1
Urban Stozm Drainage Criteria Manual Voiume 3
SM-3 Construct�on Fence {CF}
CF...._.CF �.�`F PP�S�.0 .".,r.�. d'��`. r-
� ��
STUDDE❑ STEEL
!� -f E P05T
/
%
%�
ORA!�GE RESIrvE7
�� .,�;N ��4NSTRUCr10N FENC� —�
E'/.15TIh�G �R !+FPP.OVED Et?ua�
�,.m GRADE
- -�r �
1' hdlh � . .
,�
i o' na:.x . .
SP�CrN�
�� .
�� . .
_`
� - � . . . . . . `4 �7L3f:��t� GTE�L
1 �"' rEc wosr
4' b,11Pd � .
CF- � . PLASTIC MESN �ONSTf�UCT10N FENCE
CON5TP,UCTION FENCE INSTAL�ATION NOT£S
1. SEE PL,4I� VIEW FOR:
-LOCtIT10N C1F COP�STRUC71Qhl FCNCE.
2. CONSTRUC714N FENCE SNOVrN SNaLL 8E INSTALLED FRlOR TO ANY i_ANp DlSTVP.'LING
ACTIVl71ES
.3. CONS7R��C�iOtv �Er�CE 5s�aLL 8E C044POSEQ �F ORANG�. CQd�tif2�CT�R-G�C'iE r,��:FERaaI.
THAT 15 �LT t�R$1' 4� NiGki, M�iAL POS�S ShjGUtU HAVE R PLASTIC CAP FGR SA���Y,
4 S�UDD�� SiEEI� TEE PfJ5TS SHALL SE uTILIZ�n 1"0 SUPP4P,T TkiE CONSTRUCiION FEMCE
�4'.A`/,1MUM SPACING FC]R STEEL 1"EE �OSTS SHALL BE 30'.
5 COrdSTRUCripry FENCE SHA�L 8� SECURELY FASTENE{7 Tp THE TOP, t,AIDDLE, ANp
BGT�DlA OF EACH POST.
CF-2 Urban Drainage and Flood Controt District November 2020
Urban Stoz�r�Drainage Criteria Man�ai Votume 3
Construc�ion Fence (CF) SM-3
��Sr�rrioN F��c� r�RiNTENwvcE �uorEs
1. INSPECT 3MPs EACH MIORK6RY, Al�lp Al41NTAIN TH�M I�V EFFECTIVE OF'ERATING CONDITI4h.
t�iAINTEi�1P.NCE OF B+dFs $HpIS�D BE PRORCTIuE, Aif]T REACCkilE. «ISPECT 8lAPs AS �Q�N AS
POSSkBLE {AiJD A�YlAYS �NiTKIN 24 HpURS) FOL�6'�1ING A STORM THAT CAu5�5 SJRFAC£
�F2�SiON, AND PERf�Rh4 1+�ECESSAPY hiAINiENANCE
2. FREOUENT OB5ERVATIONS dND M1.tAiNTENANCE ARE dJECE55ARY TO ��AAIEJTR[N E3MPS 3N
E�F�tCtlVE OPERAiINC CONDIilO�J fNSPECTi�NS ANp GbRRECTIVE MEASURES SHOULD 6E
DOCUMEN�EO FHpR�tJCHLY.
3. 1NHERE BMPs HAUE FAILED, REPAIR dR REPLACEhA�NT SHpU�D sE WtTlATEI? UPON
DISC�VERY OF THE FAfLUR�_
�. cn�vsr�ucr�orr FENCE SMALL BE REPAIRECf OR REPLACE� 4VIiEN THERE ARE SIGNS OF
OAMAGE SUCH AS RiPS QR SAGS. CONSTi2t1CFIC3N FENCE IS TO REi�,lAkN IN PIACE VNFIL T}1E
uFSTREAh1 DISTURBEp AR�A �S STABILIZEO RND ,�'PROVE� 8Y THf LQCAL ,�UR15QICTION.
5, IVHEN CONS�RUCT�ON FENCES ARE REMlpVEp, AI.L UISFURBED AREAS ASS�CiATED WITH TNE
INSTF�LLAT40N, ?vIf11NrENANCE, AND/OR R��,�OVAL dF THE FkNCC StiALL 8� CQVERED ti'diTH
TOPSOiL, SEEDED ANp hllll.GHEp, OR pTHERsN�SE 5TA8EL.iZE� A5 APPR�VED E+Y LCC�.i.
JE�RISplCTlpN.
NOTF, MANY JURI5DICT�ONS HRVE BMP �E7AIL.�i THRT VARY fRL�A7 UUFCO STAIVDARQ 6ETAILS.
CONSULT W17H �OCAL .il�RlS�I�'�tUhiS AS TC1 14H€CFi OE�A.IL SFl�U�EI gE l�SEO 4ti?{Ehl
DIFFERENCES ARE ivO�E�.
(O£TA7L FDAPTE€) FRpFE TOYrN OF PA�F?KER, C¢IAROUO, �ipT AVAILABLE IH Af1TOCRD)
November 2010 Urban Drainage and Flood Control Disteict CP-3
Urban Stnrn�Drainage Criteria Manuai Valuine 3
Vehicle Tracking Control (VTC) SM-4
Description _ F
• lh ' � � •
Veh�cle tzacking controEs provide � �, �, ,.-'�' •. :�
stabilized construction site access where '° ""' � ' �
s.. � .�_F•��� ��
vehieles exit the site onto paved public v�.,.,,�, ; . .�,,,,,• .
roads. An effecti�e velnicle tracking �' •��� �e;.' '� ��� ��;�� �
cantrol helps remove sediment(mud or �'"^"r�- , � �,.� � ''�; _
dirt}from vehicles, rcducing tracking onto ��`' , � "'
�s`�s;: - -
_, •
the av rf
,. - _
p ed su ace. • _
- -,. -�- -
,";;;:� . _ . _
, � .: i ..
y} 'Y � �.a ' �� r �. � 2'���� - � 4" - +:�c!
Appropriate Uses ��,��,:���t�4 �.�.>,.z���x -�..� ��•..�,
.'�,` �.�+� �;,,, '`;,. � ;� y:`.�,�y� �:
�a: : �- .._
Implement a stabilized construction ��"�`'n` �'r•'� "' '"'a"`�"�`=�`' ���- '"`�f�"�
entranCe or vehicle traGking ContI'ol where Photograph VTC-l. A vehicle tracking control pad construcced with
�I'CC�uCrit�e1vy vehlCle tCafflC eXTts the properly sized rock reduces off-site seditnent tracking.
construction site onto a paved roadway. An
effeetive vehicle tracking control is
particularly important during the following conditrons:
■ Wet weather periods when mud is easily tracked off site.
• During dry weather periods w�ere dust is a concern.
* When poorly drained, clayey soils are present on site.
Although whee�wasi�es are not rcquired in designs of vehicic tracking controls,they may be needed at
pazticu�arly maddy sites.
Design and 7nstal�ation
Construct the vehicle tracking control on a level surface. Where feasible,grade the tracking contro]
towards the construction site to reduce off-site runoff. Plaee signage,as needed,to direct eonstruction
vehicles to the designated exit through the vehicle tracking controi. There are severa�different types of
stabilized construction entrances including:
VTC-1. Aggregate Vehicle Trackiing Control. This is a coarse-aggregate surfaced pad underlain by a
geotextile. This is the rnost comman vehicle tracicing control,and when properly maintained can bc
effective at removing sedirnent from vehicle tires.
VTC-2. Vehicle Tracking Contral with Canstruction Mat or Turf Reinf4rcement Mat. This type of
control may be appropriate for site access at very small construction sites with low traffic volume over
vegetated areas. Although this application does not typically rerr�ove sediment from vehicles, it helps
protect existing vegetation and provides a stabilized entrance.
Vehicle Tracking Control
Functions
Erosion Control Moderate
Sediment Control Yes
Site/Material Mana ement Yes
November 20i0 Urban Drainage and Flood Control District VTC-1
Urban Storm Drainage Criteria Manual Vo�ume 3
SM-4 Vehicle Track.�ng Con�rol (VTC)
VTC-3. Stabilized Cnnstruction EntrancelExit with Wheel Wash. This is an aggregate pad,similar
to VTC-1,but iucludes ec�uipment far tire washing. T'he wheel wash ec�uipment may be as simple as
hand-held power washing enuipment to more advancc proprietary systems. When a wheel wash is
provided, it is important to direct wash wafier to a sediment trap prior to discharge from the site.
Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff.
Maintenanc� and Removal
Inspcct the area for degradation and ��� -+� {-� '� - �`�`� " �R �z�:_:.,,� „��„��°��
replace aggregate or mat�rial used for a r,. '�����, ,� �'�� �� ""��=�~-�
stabilized c��trance/exit as needed. Ifthe � r� ""`y"'`"�� ��
area becomes claggec�and ponds water, � - __ .
��:�
remove and dispose of excess sediment � '��;xz7� �`�` ` -�' ��`�1�
ar re�lace material witt►a fresh layer of
-�ti�a ?�m� ' :,:�
a�gregate as necessary. :•. '�• .
'�, x, { .
With aggregate vehicle tracking controls, ��:=k , �R��: ' d z �`���. � �
` 4 �.: �
ensure rock and debris from this area do ti' *� ' w.` � ' . � `�`�;..
not enter the�]ublic ri ht-of-wa . � � j x '=�� '^ � '`
C' � Y �.-; ,.;f• ,,. ,> .,,L
,� xr '� *.ysa��'�
� � �J �� �
Remave sedirr►ent that is tracked onto the ' ' ' �r� �
E'� ' �} . ��4,'��4� r
public right of way daily or more ; ,t ';, � J������;_� � '�' r.��4�,�;z.,'��`�;
}���k 4� `�'+ 'r.�1 l�. �y,�
frequently as needed. Excess sediment `�.� s � s i ;�� � s3<;� , � ��:�1�a �,.,� �
�� � ti �� ,h� � ,r�k5�r �t .�� ,; * `4 �Y � � 1 .y'�}�
in thc roadway indieates that the �.� �!r ���� , �'h x�s �_� s'�,'"n .�`t��y'� `` ����•���"
.'�;E>�f �:. 1'.i�x�;�,",. `;;;�;',+.�'yt..M.���^ �.�' .',c"'.,''�"�11r.4�•..����`i�t�
stabilized canstruction entrance needs
malllteriallCe. Photo�raph VTC-2, A vehicle tracking control pad with wheel wash
facili[y. Photo courtesy of Tom Gore.
Ensure that drainage ditches at the ,
entrancc/cxit area remain clear.
A sta6ilized entrance should be removcd only when there is no]onger the potential foc vehicle tracking to
occur. This is typically after the site has been stabilized.
When wheel wash equipment is used,be sure that the wash water is discharged to a scdiment trap prior to
discharge. AIso inspect channels ennveying the watez-from the wash area to the sedir�►ent trap and
sta6ilize areas that may be eroding.
Wkaen a construction entrance/exit is rernoved, excess sediment from the aggregate should be removed
and disposed of appropriatcly. 7'he entrance should be promptly stabilized with a permanent surface
following removal,typically by paving. �
VTC-2 Urban Drainage and Flood Control District Novembez'2010
Urban Storm Drainage Criteria Manual Volume 3
Vehxcle Tracking Control �VTC) SM�-4
�� vTC
�_
�.mT'1�"[�"_p.
r�
3
2D FOOT
(WIDTH CAN HE
i.ESS IF CONST'.
VEhiiCLE5 RRE
PHYSICALI.Y
CQNFINED QiV
BflTFi SIpES)
'I SIDEWALK OR 07N�R �p FaOT (�iIN.)
PAVED SURFAGE ,
�
_ � �����byr�s
�! i- �3�':p.,,y 7�y ��-[�--;�-�.y-��P����?.�;"-+"` ,�F
d t F� �l,1 J i��..fC�,i��'{�'�^I W �,����.T^`4:.�)h
- .����x�-��"�`,�-��i�"�� ��"`����� -r���'-%'.����-r�--`�'i��':
' ..�,� �'�,`�;���'����"�',��-����r��-e '� �-M.'��s �' S�?'� �r� ��; -
t t ���,�'�.� ��� � a� �r-�
3 .���� �.�,� t f� �
�� � kz�-t.�,.f-�=[.��.�t�t�i-�.�S ���.�-f t-1,�p.`a.:-a.��' ���F�
�+"". . "°f 'r�� rt�.,'�'-.=�. --�„ r,n �^�:� �-^-Y'-� .� r
P-d i�t^,-�.�r`��� �"4� _�-L�,.{��-i'''�.4��r�r2:����
�,���.��� -���"�-�-�����{r�€-�"��-4��`�,�:%�� 9" (MIM-�
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rt P `���=��",".'F
= Y ��:.,,,..: ,�:
� PUBLIC ` tJNLESS OFHERVJISE SPECIFIED
� ROADNIAY ° BY �OCAL JUR[SD[CTIO[V, USE
•�" a C�10T SECT. ]�7�3, AASHTO #3
� ''tl , C4ARSE AGGREGATE aR 8"
_ , t�Wl[5 RQCK
° NON-WOVEN GE�TExT1LE FASRIC
BETWEEN SOIL A�Ip RQCK
� UNLE55 OTHER4YISE SPEGIFfED BY LOCAL
IN5TALL ROCI< F�USH v11TH JURISDIE310N, U5� Ct]OT $ECT. �7Q3, AASH70
QR BEI.OW TOP QF PAVEMENT � �3 CQ�RSE AGGREGATE � 9,. ��IN.)
OR 5" hAINUS RQCK
,a -� � ��.-j� t"';r"s f-%-,`�r �a"�V
� � - ..�,'. " �- �
`� \ � � � N4N-�J6VEN GECITEXT[LE
� FABRIC
� COMPACTEp SUBGRAOE - SECT�ON A
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VTG-1 . AGGREGATE VEHICLE TRACKING CONTROL
Novernber 2010 Urban Drainage and Ftood Control Distriet VTC-3
Urban Storm Drainage Criteria Manual Volume 3
SM-4 Vehicle Tracking Control (VTC}
TC
e��J���� f`.� Y Y V Y
DITCFi TQ CARRY
WASH WATER TO
SE�IM�NT TRAP �
OR BASIN �
E A ���-,� I
PUBLIC �� ���,�� � � �
RORDWAY '�'� '"-�: _ �
��t��-i_� . %-�-�'�-t��r�t;.r'
� "��r:i'��r-c.`-z s-o"`� � ��,.:�����.'".
-°,�-.-� »t�t,�er:�t j�.''�°�"��'�.,.+r � ���
`' ���`` " ��"`� ��'`��y������
PIOTE: WASH 1NATER ��'���-� ' s��`���-.!�tr'�}���,�-+'�".:',r
MAY N4T CON�AIhf -i=:���,_��"-���`^4��a;, jm �.���''..` �
CHEMICALS OR SOAP5 P��� �� ������„� �
V�JITHOUT OBTfaINiNG '��. '�`�` �
A SEPARATE PERMIT '�IASH RACK �'`-+ � �<���.,"��,
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)
1
L 6'7" rair�. I
�_ ,. .,..,,..._ 'l
� Y� �: � .
E �'-d�J��=�,3"�� 1=�.,-i.3�.�` ���:
g � ..p=i"�'-!P�r`l�'}`-t 1a y"a".7`�i F f`-�S"-i`.yt�'..�._�:y"
REWFORCED CONCRETE RACK
�MAY SUBSTITISFE STEEL CATTLE DRAfN SPACE
Gl1RRq �'pR CONCRETE RACK)
sECT�oN A
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VTC---2. AGGREGATE VEHICLE TRACKlNG CONTRO�. W9TH
WASH RACK
�
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VTC-4 Urban Drainage and FIood ContraI Disirict Noveznbez 201 Q
Urban Storm Drainage Criteria Manual Voluzne 3
�eh�cle Tracking Con�rol (VTC) SM-4
�
i
�
�
;
vTc/ vTc/
� � � � � CN TR
$
�
!]IS�URBED AREA,
CONSTftUCTION 51TE,
� STABIUZ�p STORAG� AREA
" F�� h�tAX--� OR STAGING RREA
CU O O
:? EXIS�fNG � ' h�IN � �
PAVE� CONSTRUCTION i,dRTS, WOV�N QR €RAA
RQADWAY
y 54' l�IN
�
�
€
$
� i$�� P�IN
a�-� SPIKES OR
E ,�c�G� STAKES
� �.0��� �P�
`1����,Z,�G�'��" TRM �N� OVERL4P WtTH
� y. `d�'�1�'JF',�O SPIKES OR 5TAKES
F c�.� Q��O��'�Q'�G�`�� flR�TIlRFCR�NFQRC�M�OVEN SFRAP
� � �'��n��� MAT (TRM) CONNECTORS
( � CONSTRLfCTi€lN MAT' ENp
t � RESTRICT CQNST. VEHICL£ bVERSAP INTERI.QCK WITH
cs
ACCESS TQ SI�ES aF MA3 � STRAP CONNECTORS
�
t=
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x T
`'� 2�` L3R AS REOiJ1RED
� TC3 ACCOMMODATE
ANTICIPAr��
TRAFFIC (WI�TH
CAN 6E L�SS IF"
] CQNS'f. VEHIGI.ES
ARE AHYSICALLY
Ca�lFINEa dN BdTH
51t7ES)
VTC-3. VEH[CLE TRACKING CONTROL VV CONSTRUCTION
MAT OR TURF REINF�RCEMENT MAT TRM
November 2010 LTrban Drainage and Flood Contral District VTG5
UzUan Storzn Drainage Criteria Manual Valume 3
SM-4 Vehicle Trac�ing Contro� (VTC)
STA�I�I��'�? CONSTRUCTIQN �NIRA�dGEfEXIT INSTALLATI�N NflTES
1. SEE PLAN V1E1N FC]R
—LaCATION OF CflNSTRUCTIQhi ENTRAt3CE(S)/EXIT(S).
i —il'RE �F CONSl'RUCTION ENTRANCE(S)/EXI�S(S) (Y,�lTH/WITHOUT WFtEEL WASH,
CONSTRUCTION MAT OR TRM}.
2. CON5TRt1CT[OM1! MAT OR TRM ST'A81LI2EQ CQNSTRUCTIQN ENTRANCES ARE QNLY TO BE
13SE0 QN SMORT DltRA710N PRQ,7ECT5 (iYPICAL�Y RANGING FRdM A WEEK TQ A �30NTH)
wdHERE TH�RE WfLL BE �Ih71'FE� VEHICUlAR ,4CCE55.
3. A STA81lfZED CONSTRUCTIQtV EId7RANCE/�XIT SHALL BE LOCATED AT ALt ACCESS PqIN7S
PJHERE VEHICLES ACCESS THE GONSTRUGTION SITE FROM PAVED RIGHT—O�—�NAYS.
' 4. STA8ILIZED CONS�RUCTION ENTRANCE/�XlT SHALL BE 1NSTALLEO PRIOR TO ANY L4ND
€� �ISTURBING AC7tVIT1�5.
5. A NON—WOVEN GE4TEX11LE fABRIC SHALL 8E PLAC�D UND�R THE STABIL,[ZED
CONSI"RUCTIQI� �NTRANCE/E7CIT PRIOR Ta �ME PU�CEMEN� OF #20CK.
6. UM1tLE55 OTHERWISE SPECIFfEC3 BY LOCAL JURISUfCTIOtV, ROCK SFiALL GON5IST OF DOl"
S�CT. �7Q3, AA5HT0 �3 C�ARSE RGGREGATE OR S" (AdINUS} R�CK.
�
;
$ STAf�I[,IZED CQNSTRUCTIQN ENTRANCE,/EXIT,,,,,��A1NrF�y�lV�'�
1. INSPECT BMPs EACH WORK�AY, AND A�AINTAiN TH�M IN �F'FECTIVE �PERATING C�N�1iItiN,
MAWTENANCE OF �MPs SNOUI.D 8E PROACTIV�, N(1T R�ACTIVE. INSPECT BMPs AS SpQ�€ A5
PLISSIBLE (AND ALVJAY5 V�1TH]N 24 HOl1RS} FQLLOWIIYG A STORM THAT CAUSES SURFACE
ER(}S10N, AN�S PERFORM NECES5Af2Y �AAItdTE�fRNCE,
i 2, FREQi1ENT 085EftVATI0N5 AND A�AINTENAt�CE Aft� �l�C�SSARY TO A�AIIVTAIN BMPs IN
€ EFFECTIVE �PERATING CONDITION. INSPECTIONS ANq CORRECTIVE MEASURES SHOUL� 8E
E _ DOCUMENTE6 THORflISGHLY.
3. WHERE Blv1Ps HAVE FAILED, RERAIR OR REF'I..AC�P��N� SNOULD BE INITIATED UPON
OISCOVERY OF THE FA[LllRE.
I
� 4. RC3GK SHALL BE REAPPLIED OR REGftA��D A5 N�CESSARY TO THE STABILIZED
� �NTRANCE/EXIT TQ MR3NTAlN A CQNSISTEPJT DEPTH.
� 5. S�OlR4�NT TRACKED ONTO PAVEO ROAflS lS TO BE REMOVEn THROUGHQl1T TtiE DAY AND
; AT THE ENCI OF THE 6AY BY SHOV�LING QR SYdEEPING. SEO1WtENT �fAY NOT BE WASHEC3
[ DONlN STOR�S 5EWER qRA[NS.
�
' RlQTE; MANY .1URISOICTlONS HAVE 8MP DETAtLS Th3AT VARY FROM UOFCD STANQARD DETAIL5.
( COIVSULT WITH LOCAL JURISDICTIQtdS RS TO WHICH C1E'fAIL SHOUL� BE USE� tNHEN
; DIFFEF2ENCE5 ARE NO7Efl
E
f (OErR1L5 A�AFTEO FROld CI3Y OF 8RC30MFIEL➢, COLORA€]p, NQ7 pyAiIABLE IN AU€OCA6}
r
r
VTC-6 Urban Drainage and Flood Gontrol District November 2010
Urban Starm Drainage Criteria Manual Volume 3
Stabilized Staging Area {SSA} SM-6
Description
. ,.:.__.�z � F �, , .:: � . .
, , ... .. ,
A stabilized staging area is a clearly �
designated area where construction ��
equipment and vehicles, stockpifes, rvaste � �� ,�,� '_ � +�� - �"'
bins.and other construction-relateci � '':� 4 ���i
-��. . - ��4 A L�
� materiais are stored. The contractor _...�.�•
officc trai[er may also be located in this / � „�"
area. Depending on the size of the ' . � / , ';-�
_. ... .�� .{
construction site,more than one staging •.sscr.,.�;;��••�' t�- ��•.�
area may be neeessary. � ,....�'� ^r �_�
-=�� �,,�:.�� ,s?��
' �1 ���� E��
Appropriate Uses , �s , `- � ,� P�F��
- ,
� 1��� '�f'fM�dh� �?�t,.�� _i� `• �n,r � � �C
Most construction sites will requirc a - ''�"'�'��'•�'"-��'��-µ".'. . '.: -�r.a•r,,..�.:.�. �,
Stag111g 8i0a, whiCh should be GI�aT'ly Photograph SSA-1. Example of a staging area with a gravel sur[ace to
designated in SWMP drawings. The layout prevent mud tracking and reduce runoff. Photo courtesy of Bouglas
of the staging area may vary depending an �`o"nty.
the type of construction activity. Staging areas located in roadways due to spaee constraints require
special measures to avoid nnaterials being washed into storm inIets.
Design and Installation
Stabilized staging areas should be completed prior to other construction activities beginning on the site.
Major components of a stabilized staging area include,
� Appropriate space to contain storage and provide for loading/unloading operations,as well as parking
if necessary.
■ A stabilized surface,either paved or covered,with 3-inch ciiameter aggregate or larger.
■ Perimeter controls such as silt fence,sediment control logs, or other measures.
■ Constn�ction fencing ta pzevent unauthorized access to construction materials.
■ Provisions for Good Housekceping practices related to rnaterials storage and disposal,as described in
the Good Housekeeping BMP Fact Sheet.
■ A sfiabilized construction entrance/exit,as described in the Vehicle Tracking Contral BMP Fact Sheet,
to accom�nodate traffic associated with material delivery and waste disposal vehicles.
Over-sizing the stabilized staging area rz�ay result in disturbance of existing vegetatian in exc�ss of that
required for the project. Tkais increases costs, as well as
rec�uirer►�ents for long-ter�n stabilization fallowing the Stab�lized Staging Area
construction period. Wh�n designing the stabilized staging area,
minimize tl�e area of disturbance to the extent practical. Funetions
Erosion Control Yes
Sediment Control Moderate
SitelMaterial Yes
November 2010 Urban Draina�e and Flood Control District SSA-1
Urban 5torm Drainage Criteria Manual Voluzne 3
_________
SM-6 Stabilized Stag�ng Area {SSA)
Minim�ng Long-Term Stabtl�ation Requirements `�
; ; ;. : , ,�
■ Utilize off site parking and restrict vehicle access to the s�te. �
�
■ Use consfizction mats in`lieu of rocic w1�eF1 staging is provided in an area that wilI nof be distutbed ,�
ot}�erwise:
`, ' , ; �
: ,
` Conszder use of a`bermed contained area for materials and equipznent that do not require a . ,` �
s �
' "�
StablliZed SurfaCe.
� i �
� Gonsider,phasing af staging areas to avoid disturbance m an area fhat will npt be othezwisc �
disturbed:'
: ` _ ;':. ':. ` ` , , .�
�
:
�
x �. _,k�.��.� _�_.�...�.�„�- � �� �,.�,�
See Detail 8SA-1 far a typical stabilized staging area a.zad SSA-2 for a stabilized staging area when
� materiaEs staging in roadways is z�c��ired.
.�
�
Maintenance and Remavai
Maintenance of stabilized staging arcas includes maintaining a stable surface cover of gravel,repairing
� perimeter eonErals,and following gqpd housekeeping practices.
�
�
When construction is complete,debris,unused stockpiles arad materials should be recycled or properly
disposed. In some cases,this will require dispasal of contaminated soiI from ec�uipment Ieaks in an
appropriatc land�ill. Staging areas should then he permanently stabilized with vegetation or other surFace
covez planneci for the development.
I
�
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S5A-2 Urban Drainage and�lood Control District November 201�
Urban Storm Drainage Criteria Manual Volume 3
Stab��xzed Staging Area (SSA} SM-6
� SF/CF SF/CF
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� COIvSFRUCTION "�J � CONSTRUCTION
'� V.�HI��E ��I i' TRAILERS
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C0�€STRUCT€ON 1 N �
51TE ACCESS 1 1 ` ` „ ^ � . " , Q �
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iuSATERiA� u GRANULAR MATERIAL
STABILIZE� � ST�RAGE , �
CONS�'RUCTIQN • AREA \
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ENTRANCE (SEE � , ` a � vt
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' '�^"� '' `_ SILT FENCE OR Cflt�STRUCT10N
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SSA-�1 . STABILIZED STAGING AREA
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� sra�r�,�7F�A srac�r�G aREA ixsr��t�arioN n€aaFs
� i. SEE PI.AN VIEW FOR
—{.00ATION dF STAGWG AREA{S).
—CONTRACTOR MAY AO.lUST LOCATION AN� 51Z� bF STAGING AREA WITH RPPR�VAL
FROA� THE LOCA� JURISDIC�i0�1.
2. STA8ILIZEQ STAGING RREA SHOULD BE APPROPRIATE F"OR THE NEEDS QF �HE SITE.
OVERSIZING RESULTS IN A L4RGER AREA TO 5TABtLfZ� FOLl.p4�11NG CONSTRUCTION.
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3. STAGdNG AREA SHAE.L BE STABIL3ZE� PftIOR TO OTHER OF'�RATIONS ON THE SITE.
4. THE STABILIZED STAGING AREA SHALL CON5IST OF A �SINIMl1M �" THICK GR,4NULAft
IaSATERtAi..
5. UNL�SS OTHER4VIS� SPECIFiEO 8Y LOCAL JUR1S01CTION, ROCK SHAL� CONSIST QF' pQT
E SECT. �703, A.4SHT0 �'3 CC3ARSE AGGREGATE QR &" {A�[NUS) ROCIC.
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6, AppITIONAL PERIMETER BMPs h�AY BE REflUIRED INCLUDING BU�' NOT LIMITED TQ SILT
FENCE AN❑ CONSTRUCTtOtd FENCING.
� STAHtLtZEO_$TAGING AREA MAINTENANCE IJQTES
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€ i. INSPECT BMPs EACH WQRK�AY, AN� �.�AINTAIN TH��1 IN EFF�CTIVE DPERATING CONDI�CION.
[ , h1AINFENANCE flF SMPs SHaIiLD 8� PRQACTIVE, NOT RERCTkVE. IIVSPECT BMPs AS SQON A5
E Pfl551BLE (ANC� ALV�RYS 4�1TN1N 24 HpURS) FO�LdWIt�G A STQRM THAT CAUS�S SURFAC�
ERC75lON. AND PERFORhd P[ECESSARY MAIN7ENRNCE.
f 2_ FREQU£NT" OBS�RVATIQNS ANf} MAINTENANCE ARE NECE55ARY TC3 MAI�€i�AiN ShfPs IN
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� EFFECTIVE OPERATING CONDITION. INSPEC7lON5 ANp CQRRECTIVE MEASURES SHOULD BE
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�C3CUMENTED Tf30R0UGH�Y.
3. 4�lHERE BMPs FiAVE FAILE�, REPAIR QR REPL.ACEME3JT SHOUL(3 8E INITIATEO UPt3N
�ISCOVERY OF THE FAtLURE.
4. R(3CI4 SHAL�. 8E REAPPLIED OR REGRAOEfl AS NECE55AftY IF ftUTTING OCCLfRS OR
UNOERLYING SUBGRADE BECOMES EXP05£6.
November 2010 Uzban Drainage and Flood Control Distriet SSA-3
Urban Storm Drainage Criteria Manual Volume 3
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SM-6 Stabalized Stag�ng Area (SSA)
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5. STA81LlZEE� STAGI�tG AREA SHALL BE ER[LARG�p [F NECESSARY TQ CONTAIN PAftKIRIG,
;i STORAGE, AND 43NLORDIfdG/LOADING OP�f2A7101vS.
8. THE STA6[L1ZE� STRGING AREA SFiALL BE REMOV�� AT THE END OF CflNSTRUCTiON. �HE
GRANULAR MA7ERIAL SHALL BE REh4�VE� OR, IF APPROVED BY TME LOCA� .IURISDtCT14N,
liSE4 pN SITE, qND THE ,4REA COVERE� 4JITH TOPS�IL, SE£qEp ANp h�ULCHED OR
OTHERWI5E STABILtZEO IN A MAN�€ER APPROVED 8Y LpCAL JUftISDIC�IOh'.
NOTE: MAfdY MUNICIPALITIES PROHI817 THE t1SE OF ftECYCLED CONCR�TE AS GRANULAR
h4ATERIAI. �'QR SrABILIZED 5TAGING ARFAS �UE Tfl DIFFfCULT[�S WITH RE--ESrAHLiSHMENT OF
VEGETAF30N IN AREAS SVHERE RECYCLE4 CONCft�'f� WAS RI..ACED,
NOTE: MANY Jt1RISpICTI0N5 HAVE BMP �EYA[LS THAT V,4RY F'ROM Ub�Cp STANDAR� [}ETAILS.
GQNSULT WITH LOCAL .IURISUICTIDNS AS TO WHICM D�TAi�. SF30Ul.(3 8E USEQ WHE3V
�IFFERENCES ARE NOT£D.
(b£TPJLS AQkPfE(] FRpfd QOUCLhS COUfdTY, CdLORAA�O, NOT AVAlEA6LE IhF AUiQC.4€))
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SSA� Urban Drainage a.r�d�lood Control District Navember 2010
Uzban Storm Drainage Criteria Manual Volume 3
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Attachment 2. Erosion Contro) Security Calculations
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Fir�al �rosion Control Repor� g
Table 1 . Eros�on and Sediment Contro� Escrow/Security
Calculation for The City of Fort Collins
Project: CFlerry Street Cottages � Disturbed Acres: 1.10 _�
BMP Amount
Estimated lJnit Totak
EROSION CONTROL BMPs Units Quantity Price Price
Silt Fence {SF} L.F. 1000 $1.50 $1,500.00
Inlet Protection {IP) EA 0
Concrete Washout (CW) EA 1 $250.00 $250.00
Vehicle Tracking Control (VTC) EA 1 $500.00 $500.00
Stockpile Management (SP) CY 300 $1.50 $450.00
Rock Sock (RS) EA 1 $200.00 $204.00
Mulching (MU) AC 1.10 $40�.00 $440.00
Water Truck - Dust Contro[ EA 1.00 $750.00 $750.00
Surface Roughening AC 1.�0 $150.�0 $165.00
Good Housekeeping Practices LS 1.00 $250.00 $250.00
...etc... $0.00
(add aIl other BMPs for the site in this list) Sub-Total: $4,505.00
1.5 x 5ub-TotaL• $6,757.50
Amo�nt of security.• $6,757.50
Reseeding Amaunt
Total Acres x Price/acre: $3,593,7p
L�nit Price of Seeding per acre: $3,267.00 Sub-Total: $3,593.7�
Elnit price for permanent seeding; 0.075 ($/SF} 3.5 x Sub-Total: $5,390.55
Amount to Re seed.• $5,390.55
Miniumum �scrow Amount
Minimum escrow amount: $3,OOQ.Q4
Finaf Escrow Amount
Frosian Control�scrow: $6,757.50
Fields in yellow should be amended for this project.
'°Tlee amour�!of IJ�e securrty n�usi be based on orie and one-Iralf times[ke es[rnrate of fhe ros�to iiistrtlf the appraverl measures,or or�e nrid One-half times the cost to re-
reget�te flre distrrrbed land ra dry landgrasses based rtpon rarrrf cost detenruered by the Cify�'sA��nual Revegetaiiwr aud Sta6rlizn[ion Bid,wlricl�eeer rsgrealer.Jn�ro ir:stnnce,
wi1!the aneouul ofsecuriry be lesslhat�one[housaird five lrui�dred dollars(SI,500J fnr residelHia!deeelopmerrt or U:ree tleausmrd dollars(S3,000}for commercial
rlevClnpme�et"
����ba'ciqiC6h H6YWf�iC:�IS>rervsen:�ocuments:Oxurn�nts:Sorensen Engineerfng&Cons[ructlon:Projec[s:GiimaRin:GilmaKin-Cherry:FINAL$UBMfITAL-CHERRY:18-10-15_Fina1 @rosion Estrow Sewrity Cak_REV 3.�Is