HomeMy WebLinkAboutDrainage Reports - 04/06/2001 (2)r.-
PROPERTY OFF��I A'' «'dadOf
FORT COLIINB
EROSION CONTROL REPORT &
STORMWATER MANAGEMENT PLAN
FOR
WESTCHASE P.U.D.
At the
Northeast Corner of Trilby Road and Timberline Road
Larimer County, Colorado
Prepared for:
Marcus S. Palkowitsh
Willowwood Corporation
760 Whalers Way, Suite B-102
Fort Collins, Colorado 80525
(970)204-4070
January 26, 2000
Revised June 6, 2000
Revised December 14, 2000
Project Number: MSPP 0000-0002
Prepared by:
Roy L. Vestal, P.E.
David Evans and Associates, Inc.
777 South Wadsworth Boulevard
Building 3, Suite 100
Lakewood, CO 80226
DAVID EVANS AND ASSOCIATES,
PROFESSIONAL ENGINEER'S
- CERTIFICATION
I hereby certify that this Erosion Control Report for the Westchase P.U.D. was prepared
by me and under my direct supervision in accordance with the provisions of the City of
Fort Collins Storm Drainage Design Criteria for the owners thereof.
a�uuunu,,,
0
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Roy L. Vektaf
Registered Professional Engineer
Colorado P.E. 31396
' Westchase P.U.D
Erosion Control Report
TABLE OF CONTENTS
I. GENERAL LOCATION AND DESCRIPTION ............ ........ ......... »........ ....... «......... ...... 3
A. Location.............................................................................................................................3
' 1. Township, Range. Section. IA Section.........................................................................3
2. Local Streets................................................................................................................3
3. Surrounding Developments.........................................................................................3
' B. Description of Property
1. Area in Acres...............................................................................................................3
2. Ground Cover. Topography and Soil Description.......................................................3
II. PROPOSED EROSION CONTROL MEASURES.............................................................3
A. General Project Description...........................................:...................................................3
B. Rainfall Erosion........................................................:........................................................3
' I. Rainfall Performance Standard....................................................................................3
2. Effectiveness................................................................................................................4
3. Outfall Protection.......................................................................:................................4
C. Wind Erosion.....................................................................................................................4
III. IMPLEMENTATION SCHEDULE.....................................................................................4
1 A. Timing Schedule................................................................................................................4
B. Temporary Stabilization.....................................................................................................5
C. Permanent Stabilization.........:...........................................................................................5
D. Maintenance Schedule ................................................. 5
............................
E. Cost Estimate.....................................................................................................................5
IV. CONCLUSION .........................
IV. REFERENCES..............................................................................................................:...:....7
V1. APPENDIX...............................................................................................................:.............8
Drawing Exhibit: Erosion Control/Phasing Plan .
I
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LOCATION
ROAD 34
ROAD 32
Figure 1 - Vicinity Map
1" = 5000'
Westchase P.U.D..
Erosion Control Report
I. GENERAL LOCATION AND DESCRIPTION
A. Location
I. The proposed project is described as the Southwest Quarter of Section 8. Township 6
North, Range 69 West of the 6 h Principal Meridian in Larimer County. Colorado.
(See Figure 1 — Vicinity Map.)
2. More generically, the property is located at the northeast comer of Trilby Road and
Timberline Road. "
3. This parcel sits immediately northwest of the Fossil Creek Reservoir and as a south
sloping site, offers unobstructed panoramas of Fossil Creek Reservoir and Longs
' Peak.
B. Description of Property
1. The parcel is a complete quarter section (including the east one-half of the
Timberline Road right-of-way) and covers 160.066 acres.
' 2. This property has been owned by the same family for several generations and has
been utilized as irrigated farm ground. Soil type designations per Larimer County
Natural Hazard Area Maps indicate that much of the area consists of eolian deposits
' on flat or gentle slopes. The deposits may be mixed with underlying expansive
colluvium. The potential to be eroded by either rain or wind appears to range from
low to moderate.
1 II. PROPOSED EROSION CONTROL MEASURES
A. General Erosion Control Plan
The project is entirely located within the Fossil Creek Reservoir drainage basin.
Although the potential to be eroded is low to moderate, the historical release of sediment
from the site has been very low. Due to the topography and the natural drainage patterns,
two low points within the southeast comer of the site have acted as natural sediment
basins and detention ponds. The drainage plan for the project is to enlarge these low
points to accommodate the 100-yr-storm event, and likewise to continue to act as
sediment basins. Similarly the three proposed upstream detention areas described in
detail within the drainage plan will act as sediment basins also; therefore limiting the
amount of sediment carried to the larger detention/water quality ponds. Each pond or
basin was checked to make sure that the 100 cubic-yard/acre volume criterion was
satisfied. To prevent from having to remove large amounts of accumulated sediment in
order to return the ponds to their required detention volume, however, it is recommended
that each pond be overexcavated as to account for 100 cubic-yard/acre criterion.
`■ B. Rainfall Erosion
I. Controlling rainfall erosion often results in controlling wind erosion, so the erosion
' control plan was completed for rainfall erosion first. The same three basins used for
the drainage plan were used for the erosion control plan. The three basins were then
split into subbasins depending on the location of any upstream detention areas. The
rainfall performance standard was then determined with the use of standard form A to
be 81.3%, 81.2%. and 81.2% for basins A, B, and C respectively.
1
David Evans and Associates, Inc.
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Westchase P.U.D.
Erosion Control Report
2. Standard form B was then used to calculate the effectiveness of the proposed erosion
control methods. The development of the entire site is divided into six phases. Each
phase in tutu requires different methods of erosion control. Therefore. the
effectiveness of the proposed erosion control methods for each basin were
determined for the corresponding phases of development. The calculations can be
found in the Appendix. The proposed erosion control methods included bare soil
(smooth and rough), roads/walks, native grass, temporary vegetation, hay bales,
sedimentation basins, and sod grass. The effectiveness for various combinations of
these erosion control methods is more than adequate to satisfy the established rainfall
performance standards.
3. To prevent offsite erosion, more specifically erosion at the outfall from the southeast
detention pond, two important measures were taken. First and foremost, the outlet
structure for the detention pond was sized within the drainage report to reduce the
release rate to less than the historic amount of 70 cfs. The outlet structure will limit
the release for the 100-yr storm event to 40 cfs. Secondly, riprap was designed to be
placed at the outlet in order to prevent erosion to the existing outfall channel from
concentrated flows. Calculations resulted in using Type L, however, for aesthetic
reasons and to reduce vandalism. Type M riprap will be used throughout the project.
Calculations for riprap sizing at the outlet are included in the Appendix.
C. Wind Erosion
Additional erosion control methods for wind erosion will be unnecessary due to the
methods used to prevent rainfall erosion. The use of temporary vegetation will minimize
the exposed bare ground to the area within each phase of development. As development
occurs and each phase nears completion permanent vegetation or sod will be installed
before the next phase of development proceeds with exposing more bare ground. If at
any time during construction activities, weather conditions become dry and windy, it may
be required to use a water truck to water down any bare soil. This measure will most
likely be needed as the earlier phases are completed.
III. IMPLEMENTATION SCHEDULE
A. Timing Schedule
It is anticipated that the development of the entire site will be spread out over the course
of four years. Overlot grading is desired to commence in December 2000 and be
completed by March 2001. With the exception of approximately 25.1 acres, which will
maintain its natural vegetative coverage, the rest of the site will be seeded with temporary
vegetation. This process should be completed within the two months following overlot
grading. In the fall of 2002, phase I should be completed or near completion, and
permanent seed planting and/or sod installation can begin. As proceeding phases are
started, structural erosion control methods will be installed if not installed previously as
required by the erosion control plan. The development of the entire site should be
approaching completion in August 2004, at which time final permanent seed planting
and/or sod installation will also be completed. At this time, all ponds, storm sewers and
culverts will be restored to their original design capacity and configuration and become
fully operable. Standard form C in the appendix gives a more detailed schedule of the
erosion control implementation.
David Evans and Associates, Inc.
4
Westchase P.U.D.
Erosion Control Report
tB.
Temporary Stabilization
Temporary stabilization will be implemented immediately following overlot grading as
mentioned previously. It is recommended that a crop such as wheat or rye be planted for
'
this purpose. This temporary vegetation will then be left alone until a new phase
warrants exposing new bare soils. Once all construction activities are completed within a
phase, then permanent erosion control methods may be installed.
C. Permanent Stabilization
Permanent stabilization will be in the form of permanent seed planting and/or sod
installation. The particular seed mix to be used will be based on the recommendation of
the City of Fort Collins. This process will commence upon the near completion of each
phase of development. Structural erosion control methods will be installed to protect and
'
preserve any permanent stabilization already in place.
D. Maintenance
The Owner, General Contractor, and David Evans & Associates, Inc. shall make routine
checks of all erosion control measures to ensure proper implementation and operation.
As the project expands, so shall the monitoring of erosion control measures. Due to
conditions that may arise in the field, additional control measures may be determined
necessary and shall comply with standard engineering practices as per the City of Fort
Collins.. Additional measures may include vehicle tracking at every major construction
access point to minimize the transport of sediment to offsite roads. After each significant
'
rainfall event, erosion control measures are to be checked by the General Contractor. If
repairs are needed, they shall be completed immediately by the General Contractor.
If any part of the erosion control system is found to be deteriorating, it will be repaired
immediately by the General Contractor. Silt and sediment shall be removed after
reaching a height of one half of the designed erosion barrier. At all times during
'
construction, erosion control shall be furnished and maintained by the General
Contractor. Sediment basins will be overexcavated but may require periodic sediment
removal to maintain their design minimum detention volume.
I
i
L
Upon completion of all phases of development, the General Contractor will restore all
ponds, storm sewers and culverts to their original design capacity and configuration for
full operation.
E. Cost Estimate
The following is the Erosion Control costs estimates divided into each Phase:
PHARR r
ITEM
AMOUNT
UNIT COST
COST
Silt Fence
52001.f.
$1.00 r I.f.
$5200.00
Straw Bale Barrier
100 bales
$6.00 r bale
$600.00
Vehicle Tracking3
each
$5000.00each
$15,000.00
Temporary Seeding/Mulch
79.2 acres
$750.00 r acre
$59,400.00
Over Excavation of Ponds
16,000 C.Y.
$1.00 r c..
$16,000.00
TOTAL =
$96,200.00
ITEM
AMOUNT _
UNIT COST
I COST
Temporary Seeding/Mulch
49.0 acres
$750.00 per acre
$36,750700
TOTAL =
$36,750.00
David Evans and Associates, Inc.
5
Westchase P.U.D.
Erosion Control R
ITEM
AMOUNT
I UNIT COST
COST
Temp rary Seeding/Mulch
2.3 acres
$750.00 per acre
$1.725.00
TOTAL =
$1,725.00
V"A� a
ITEM
AMOUNT
UNIT COST
COST
Temporary Seeding/Mulch
4.5 acres
$750.00 per acre
$3.375.00
TOTAL =
$3.375.00
IV. CONCLUSION
The proposed erosion control plan satisfies the technical criteria as set forth in the City of
Fort Collins Erosion Control Reference Manual and the Storm Drainage Design Criteria and
Construction Standards. This plan is adequate for both rainfall erosion and wind erosion.
The proposed detention facilities within the drainage plan will be utilized for sedimentation
basins during construction phases, and all drainage structures will be restored to design
specifications upon completion of construction. The outlet structure and the riprap design for
the outfall from the southeast pond will protect the existing channel to Fossil Creek
Reservoir.
David Evans and Associates, Inc.
6
Westchase P.U.D.
Erosion Control Report
V. REFERENCES
1. City of Fort Collins Storm Drainage Design Criteria and Construction Standards. May
1984.
2. City of Fort Collins Erosion Control Reference Manual for Construction Sites. January
1991.
3. Urban Storm Drainage Criteria Manual, Volume 2, Urban Drainage and Flood Control
District. March 1969.
David Evans and Associates, Inc.
7
Westchase P.U.D.
Erosion Control Report
APPENDIX
Phasing Map
Rainfall Performance Standard Evaluation (SF A)
Effectiveness Calculations (SF B, 9 pages)
Construction Sequence (SF C)
Sedimentation Basin Sizing Check
Rip Rap Design for Southeast Pond Outlet
Rip Rap Design for Circular Channel
Air Pollutant Emission Permit (4 pages)
IN POCKET: Erosion Control/Phasing Plan
David Evans and Associates, Inc.
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RAINFALL
PERFORMANCE STANDARD EVALUATION
(PROJECT:
I
WESTCHASE
Au.c.
(PRECEoiyG/cuR,u& covsr)
STANDARD FORM A I
I COMPLETED
I--------------------------------
BY: ATR
DATE:/zy/oo
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CARMICHAEL. COURT TO DES16,jE
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EFFECTIVENESS CALCULATIONS
-------------------------------- --------------- ------ 1
PROJECT: WESrCHgSE F u. p. (ifECEe/HG: 1614R/NG CO.VsT.) STANDARD FORM B
COMPLETED BY: Arm DATE: Izq/el
I
Erosion Control
C-Factor
P-Factor
Method
----------------------------------------------------------
Value
Value
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(sec)
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ADEGIUATE FOR BOTH PHASE = C PHASE I
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i-----------------------«---------------------------------
"-"""-"---"-
HDI/SF-8:1989 I
1
crREET qNp rMb Ent STREET cRoM 6ALaW/Al sT'!FF
To aARMICHAEI- STREET
6Af.IM 62: TRILBY R'oAp FROM WEST -CHASE F2D. Te WES7CH/9.:r
TREE-5T['//,6 Qo qb, WESTCHo75E e0. .91vG Coy,p7-
EFFECTIVENESS CALCULATIONS
----------------------
PROJECT:----------1
WESTCN�lSE
P.N.G.�PRfCE014/G�eueIAIG cowsr.)
-------
STANDARD FORM B
COMPLETED BY: ATR
DATE:
I
Erosion Control
C-Factor P-Factor
Method
---
Value Value
Comment
A-477 71/L------------/.00
-__-___/.00-_-_------
S�OSTM__-_- I
/,00 0.90
Rouaw
TProvofARy ✓EGETATIO A/
O.Ys
NAY 6A4E 5
5 Fe/MFN TRT/ow BFS1A/
s.cr FF.t/c6
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BASIN
E
SUB
BASIN
61
AREA
Yz.P-
ez 1 :z.y
_-----CALCULATIONS
--- --------------------------
ROAG -I WAC
6ARE GRou•vG = 23.00c
5'"o 07/,+ = Go r Z3.0 a /3.8ae
FOUGN = y0% x 23.0 r a
i.Z aG
T EN,'PopA I?Y VEGETATION
wTG C-F.CTCA=L(o.ei
WTe
.(Loa.13.12 (0.40.4.2)l
F-vacroR % O.$o Y 0.50)
L 23.o
0.19
(o. b8 - o, 19%] /00 = 87. /
ROAe61WALk = F.7 a,
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koyGN ` Yo% r /2.M - S,O oc
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TEM POLAR Y VE6E rA T/o.V =
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r(�,00„7.Y�. .$,0�..
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1-------------------------------------=-----------------
---------------
' HDI/SF-B:1989
A
I
7
1
J
EFFECTIVENESS CALCULATIONS
-------------------------------- ----------------------------
--------
PROJECT: wEsrcNASE P, ✓. p, (PIVEGEC/�/G�pu¢IAIG Cw�/ST.) STANDARD FORM B
COMPLETED BY: ATP, DATE: I zs oo
Erosion Control
C-Factor
P-Factor
Method
------------------------
Value
Value
Value Comment
IBARE
SOIL
/.00
----------------------
/.0o Shoo TN
•, ,•
/.00
0.90 IPIt/GN
_
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_
9.01
TEMP.- OOR,q Y ✓E6FTR f/eN
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0.80
sEp/MIEN rA T/oo/ BRS/N
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MAJORI
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CALCULATIONS
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TEMPORARY VEGETgrION
wT0 C-FgCTOR=[(O.OI•%.3�r�0.01. j3.o�•�I.o0rj.2�♦
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0.19
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ko.e05/wR u/ = 1.7 .c
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l En/MFA/rRr/ON
rFMFOOPRRY VFGFrrTAr',oAl
el TO C-FRC ToR = 1 (o.oI - 3,7) + (o.ol . IZ.Y> + (Loo r 10. Y)+I
(0.y5 w S.9)�/32.`i ` 0.41
wro ►_PPcTOr 0.90 r0.50 >0.60 = 0.70
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EFFNEr = 0?6,YY)7/7S.Z
�I
--------------------------------------------~-
----------------------
I/SF-B:1989
EFFECTIVENESS CALCULATIONS
I---------------------------------------------- - ------ -----------
PROJECT: wesrcNASE P. �/. p, (PeECEO/A161,.e,vc ce,vsr.) STANDARD FORM B j
I �
ICOMPLETID BY: ASR DATE:
I Erosion Control
C-Factor
P-Factor
Method
I------------------------------------------------------=�
Value
Value
Comment
6AFE SotL
/, DO
/.Oo
SMoo TN
�fegn5/wAt K
/•aO
ROG6N
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/, oo
fEn�vrEnk'y vEGETFr/oA/
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NAY 609LES
/, o0
SEe/NrENTgT/o,v Bq5/N
O,EO
s itT fEA/CE
S•e GhA
/•00
O•SO
I
--- ---------------
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IBASINI (p)
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II
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To TAL
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DI/SF-B:1989 --- ""-"--"""I
EFFECTIVENESS CALCULATIONS
------------------------ ------------------------ --------------------�
PROJECT: wesrcNASE P,u.O. �PREGEA+/VG�nwe/y6 cousr.� STANDARD FORM B
COMPLETED BY: A 7R DATE: zs o0
I Erosion Control C-Factor P-Factor
I Method
Value Value Comment
IAAe----------------------------------------------------- I
IBAkE SI/L /.00 /.00 SMeory I
/1 0 o 9.90 Ro✓G N
I 4 S�ws/LK 01o/ /.00 I
NAY B/oLES /.Cc 0.80 I
SEd/HFA/Tq f/ou 6ASIA/ /,CO 0,50 JI
S.LT FENCE /,00 O.So 1
ISob G,PgSS 0.01 /.oe
I--« ----------- I
-I
(MAJOR) PS I SUB I AREA I ----------
I
IBASINI (%) IBASINI (Ac) I CALCULATIONS I
I1----------------------------- i
6 8/.z Y2.8 I fCAGS/wAa,C
f'MOSf 7iI I I ' .5 o0 GRA55 = 3y.8 oG
82
wre G-FACTp,Q=`(C.O/�8,o).�o.o/x3v.8��/y7.8 `o.o/
W re i-FRfre1Q = 0.60
(C.G/ r C. Cc)] > /DO
3T.y I apAe-/✓qcu = Y. 9 ac
sot G4Afs /2 ,./oc
1Ew/ EA.,rAT/oA/ BqS/Al = /D, y oc
BARE 6,CvmvC ` V-7 ac
I3mpeTN • 6 0 % .. 1. 7 2.8 uc.
I/Cad A' Vo% v 1/.7 = /, Sac
IWTG C-FACTOR '(0.01-V..1)+(o.08-12.4oo�,o.Y)•
y7
II wre �-FACTOrli.ce x 2.$) • cn.,c . �x.s....sorc.so
R � l 1.9)
9. 7
7-0TN L i 75. Z.
EFT = 7ro. W./6/0
7S.Z
:. PLAwA re, F4ec.51v" Ceq/7-A1oL v/LL E6 I 1
ADEQUgTE Foe AtL' y PHgSES !
----------------------------- ---- ------ ----------- ------- ---- ------ --
I/SF-8:1989
ED.) ME12L07" COVrcTI TIL OEwI LT, FeOM CA¢MICHAEL ST. 're NJpCTCHA$F
BR61A1 CZ; GARMICHAEL 6T FEpM CMIq A1GLEe s-r. Tp vESTCMA75E FL. ANC RFk.: i
. r/LC EAJ CT. GRCM CALCa.T•Q LT. To wES TCNASE RG, wES TC MA!C IEc. F/
7'/M8l12L/•VE RC, To TRILBY • ,b./ AA/4 45ARR/SCAJ CO&erT
2ASIN C'F: TRILBY RC. FFpM CARM/cM/9EL. Z-r Te w.—erCN/4s£ A7C,
EFFECTIVENESS CALCULATIONS
----------------------------------------------
-------
------------
PROJECT: wesrcHAsE Pu.n. (vefceo/vG�CUR//uG covsr,) STANDARD FORM B j
COMPLETED BY: ATR I
DATE:
Erosion Control
C-Factor
P-Factor
Method
-7-6A-;
Value
Value
Coamient
6p/L----------
-----------------------------------
rcACS�n/A LK
/•GO
O, 9p
Rpd6H
HAY SALES
I•p0
0,8o
•%FG/ATFN rAT/op gP!IIV
I
/. CO
O•SO
=ILT FEA/C£
/.po
O. SC
f
TEM Pc /'qpy YEGETA T/vA/
MAJOF
BASF
G
SUB
(BASIN
c/
G3
- - - - - - - - - - - - -
AREA I
(Ac) I CALCULATIONS
R•Ans- -- -_6--- N ------------------- «
•3 qc
BARE GRpwuC =
SmarrH v e cv x /.o c
7FMPo/q Kw VEGETAr/e A/ c '
7 a / G
wT f-
G FACTOR = (O.N .6, 3)r(/,00
WTG F-FACT,P. = rC1.0o .. O,F�s (0.40 _-0.4�� K O. $O r0•SO K4,$t�
L /.0
0.14 -1
EFF �I -(o.?c • G•19� I x l00 - 9H.3%
BARE 6R0u,vC
SMpo Tx -. FC / + Y. 3 = 2.bac
<cv" T vo% x 11.3 1
T11MF&.VARY YFGErAT/p A/ v �b 7AG
wre c-FAcYOR r('O. 0/ y 2.b�+ �/.po. '.,,G� •�/,ep /•7) w
�p•Y$r IF.7�J /23.6 0.50
wrb G-FACT,FT L (I'00•Z.b)+(o.9or1.7) Y0.80 x O,5or
0.50
Y.3
% - -
e
7.Y ReACS�wALK • O, 9.c
S FC/M FA/rA T/IA/ 0,9.3
BARE 6RomA ,b - •/, Z qc
S MopTH= bo%. .Y, Z= 2. Sac
I
wrt C-FAC70k'=��Oolx0.9�+�LDO'Z,3�a�I.oOr2.5�+
I-------------------------------------------------
HDI/SF-B:1989 ------------'--------
1
EFFECTIVENESS CALCULATIONS
'
I-----------------------------------------------------
1PROJECT: wESTCNRSE R U.C, �PRECEe/NG/oua„vG Coasr,)
------------- i
STANDARD FORM B j
BY: A rR
DATEI
:
;COMPLETED
I
I Erosion Control
C-Factor P-Factor
I Method
Value Value
Comment I
I----------------------------------
---------
_
I f.AkE So/L
---------------
1.00 1.00
ROUGrI I
I ROAL:/WALK
1.00 0.90
SMocTJ/
'
I NqY EqL ES
C.01 1,00
I SE[/MEvrA T/o,v elfs/�/
1.00 O 80
/,00 0.5o
I
IS/LT FENCE
1.00 O.So
I
PC'IF Av, Y VECE TA rmW
O,'fs
i Sob 61zP155
I---------------------
O.O/
IMAJORI
---------
PS I SUB I AREA
---«---------------------------------i
I
IBASINI
(A)
IBASINI
(Ac)
I CALCULATIONS
I
I
I -----I
(PRASEII
----
81.7-
I ---
C3
I
I------I-------------r
7.•{
--------------
wr0 ►-FACroR I (/•oO xZ.S�. (0. 10 >/,
7) .BI
x/O�0.50 xO. Se
IC
C c,u r.�
I
L
I
J
-
0.19
I
I
EFF loo =
83.3
'
To rq,
y5.y
81.Z
I CI
I 14.y I
FGApliwAtK: 6.3"
M
#Aral
r
I
II
I
rEn, OFARY VFGCrAT/OA/
wrC C-F.4creR = C(o.Ol •6.3). (0.01+•f.o� (o.YS•71) /Y.
7/ "I
f
I
I
II
W rD P-Fge70R a o,80 + 0.50 r 0.
50 = O.ZO
IEFP
LI- (0.23 *0.Z07 A 100
IC 2
=3.4 I
RoADS� WALI<5 = S. C'qp
I
SOp 64ASS = y.joc.
IIJ
I
i
BARE as FcouND- 7.8 qc
SMOOTH- El'% r7,8 S'.74C
I
1
I
TEMPORARY vFC-ETArIOAI
1 - .I wre C-FAC 7-0,e =r(o. ol. S. c). (O,o/r y, 3) (,.co,. y.7).
(/.Cox 3./) . (O.ySx 6.5)3lz3.6 =49.y(o
wre P-FACTOR= f(/..a. V. 7)1(090x 3, 1)
1xc.80.O.s0Yn.50
7. E .1
i 1
C3 I 7H I /POq p��wALK� 0.9oc
II I I .SEC/ME,VrgT/a,v BAS/A/ � L,3aG
I I I I SOL GFglzs c Y,ZAG ..
I I I I i Wrb C-FACraaL
I--------_-_- --------------------- o _37-
----- ---------------------
HDI/SF-B:1989 ""-"""
A
1
1
1
.1
1
1
1
1
1
1
1
1
;.I
IEFFECTIVENESS CALCULATIONS
-------------------- -------------------------- I
PROJECT: N/EST4HA56 Pu•C. (PRECEG/NG1Au2/U6 COVsr.) STANDARD FORM B
COMPLETED BY: ATR DATE: .11z51100
Erosion Control
C-Factor
P-Factor
Method
-- ---
Value
Value
Coment
o/L-----------/.oe
--------
--------
RogeS�WALK
/.00
o.so
ROu6N
MAJORS
PS
I SUB
I AREA
I-------------
BASINI
(A)
81.Z
I
IBASINI
3
I `
(CoIJ � j
(Ac)
I-----
7.41
I CALCULATIONS
I ------------------ ----------------- --------
I WTo P-fACToR = O, �D x O. 50 x o. So O, Z o
r
c -I
OxA�E IL
COK I)
-(o. 3Z -o. Zo)3 n /oc 93, b
7-07AL
YS.Y
EFFu�r`CC 95,Yr /8Y)r(7I.3 �'23.6
'NA E Y
I 81 Z
I G /
I /y =/
(REMA/US U,(/CNA.VGEp �,e0/y PNASE ,:z
I CZ
I 23•(-
RoAoS�WiILKS ' S.Zoc
I Soe 0RA I-'- _ /2./ ac
GARE Sr/L (c. j i
I
IRO146H
' So% x
I
I
IwTE. C-FACTeP.=r(o.o/.5�.(o.or�li.l�•CI•oo+3.?a� (
I(1.00 r 3.1W23.6, 0.27 I
WTO P-FACTOR=1(1.00-3.2).(O.9ox0.80r0.50M0.50I
I
I
I
tFF = LI- (0.27-go-13)7 `loom 95.17.
7 `/ I
REMq/NS ad/cH ANG ED xeOA1 PHASE .7- - I
EFL= 93. (0
TOTAL
YS.Y
EEFNET=C(95,Yr/Y.Y)a(9S./x23.L)+(f3.bx 7. y)]�YS• H
DI.Z
C/
IY.Y
RoAes/wgLK �i.3ac
OE _(
soe 6egss i
FARE SOIL (SMOOTH) a 7.1
II
i
i
wrA. G-FAeroR =I(o.o1>•6.3)r(,.o1r 1. o)+(1•oO r7. 111/14.y -
I
I
I
W TG, P -FACTOR = 0.80 • 0.50 D. $O = p,Zo
E F F LI-(O.so.0.Z0)7x/oo
I
I
I
I
I
I
--------------------------------------------
DI/SF-B:1989
` '1
I
I
-1
I
1
EFFECTIVENESS CALCULATIONS
------------------------------------------------------- - !
PROJECT: /✓ESrc/Igs6 Pu.c. (�tECEc/�1G/npeiNG coNsr.) STANDARD FORM B I
COMPLETED BY: 14Ire DATE: z s oo
I
Erosion Control C-Factor P-Factor
Method Value Value Comment
-------------------------------------------
Acae-w-/wAtk O.O/ /•00
Soe GRq SS - O.O / /.00
----------------
MAJORS PS
I SUB
BASINS
(q)
BASIN
G -I
Er.z
i cZ
�7N.95£Yi
I
ceNT.)
I
I
II c3
I I TC TqI I
------ --------- --------------------------- ---
AREA
(Ac)-I CALCULATIONS
-
23.6 I ---- -------------------------------------
7.H
HS. y
Soe GRq 35 = /B.ygC
wrc c-FAcroe =L(0.0/WS.7-)4 (,.0/./d.0712.3.6= 0.O/
W rjD cTOQ
FF F _ (C. o/ K o. so)] ^ /oo 99. S "/.
REMA/NS uNC NA.VG Eo FROM PHASE
I
I EFyFT - L(9D.o. Iv, y). (99,!5 3,6)r(9-4.G Y 7.Y)�/YS.�J
> e/.zo/. I
PLANNED -,eej10N cnvrRo� Wit< BE ADEQUATE
FOR AIL PHASE=
1-----------------------------------------------------
-----------------
' HDI/SF-B:1989
' CONSTRUCTZON SEQUENCE
PROJECT:- Wesfr,kaSc- QU.D,
07000-a00,4 STANDARD FORM C
.x.QUEN= FOR X ONLY COMPLETED BY: GLHE DATE: Icy L1DO
' Indicate by use of a bar line or symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a new schedule for
approval by the City Engineer.
YEAR I co 01 01 01 Oa W Oa 03 03 03 O4 OY
----------------------MONTH- i PeG APR I Au6I VeeG I APR I A(46,1 C c I ApR I Aub I DEG I APR � AN6
OVERLOT GRADING lemma
WIND EROSION CONTROL
Soil Roughing I
Perimeter Barrier I
Additional Barriers
Vegetative Methods I -
Soil Sealant I
Other i I
1 RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
' Terracing
Asphalt/Concrete Paving
Other
f
1 VEGETATIVE:
Permanent Seed Plantingl
Mulching/Sealant
Temporary Seed Planting) mom
Sod Installation
' Nettings/Mats/Blankets
Other
-57RUCTURES: INSTALLED BY MAINTAINED BY
1EGETATION/MULCHING CONTRACTOR
DATE. SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
-`, /SF-C:1989
1
' ® �cJN.
DAVID EVANS AND ASSOCIATES, ® BY A.rR DATE
JOB DESCRIPTION wEs rc yasE P, u. c. SHEET OF SHEETS
CALCULATIONS FOR SECIMC- ITATIOIJ BASIN Slelu6 CHECKED BY DATE
BA51A) of Gou TOIgu TAPy R4FamiREG ,QEOL//REe PofO v/DE'b
SUB El P SIN .99FA' 696) VOL. CYC9 VOL YOL (AC -FT)
' f. SY.Y SS/I/O 3• y Z8.5 �AR6E DETENTICIJ/WQ
E, yZ.P Y28o Z.7 Z.E UPSTREAM DETE&IrIc Al
' E2 32 9
3ZYo 2.0 ZS.S LARGE DETEIJTIvii Ava
' '� �' /y'I' /Y'lo /.o O.E uvsrREaM CET FA)T IOA1
2360 /,$ �•i N►srREAM DET EN TIO'/J
7'V 7y0 e. S Li.9 SMALL DETEA)TION/WQ
THE RFCtAlkEG VOLUME EXf E6b-5 THE PROVIDED VOLUME I YHE 5EDIMEm-
TF'IOA' BASIN`- FO/; ;,; C2 AND c3 ARE DIRECTLY COWA)EcTEG w/TH cuL-VEI?r5-
THFKEFORE 7-HE TOTAL VULUME PRCvIDEb BY BA51M C IS MORE TH/9^/
5uF-VICJeJT" FOR THE VOLUME REQu12Ep.
h �lSC TIOAI 'T n RECoHMEn.DED TO OVEREXCAVRTE EACH POND SO TMrT-
Cr FOP7' TC rE TURA/ PONDS To LaE:/GN SPEC/F/Cf T/ON. IS /y/q//MAC„•
1
i
1
' RIPRAP DESIGN (OUTLET FOR SOUTHEAST POND)
East Pond
Conduit Outlet Protection Westchase P.U.D.
Section 5.6 UDBFCD Criteria
Input
Channel Flow Q =-.48.cfs
Tailwater Depth Yt = .2:05 ft
Eq. 5-5
Circular Culvert
(d5o/D)(Yt/D)^1.2 / (Q/D"2.5) = 0.23
diameter D = 2.75 it
Q/D^2.5 3.83 < 6.0 to be valid
Eq. 5-6
Rectangular Culvert
(d50/D)(Yt/H) / (Q/WH^1.5) = 0.014
width W = 2A4 it
height H = 2A4 ft
Q/WH^1.5 ;5.16 < 8.0 to be valid
Q/D^1.5= 10.5 Q/WH^0.5 =1 12.59
Yt/D = 0.75 (Use 0.4 if Yt is unknown Yt/H =1 0.84
or if hydraulic jump downstream of outlet)
ref TABLE 5-7 ref TABLE 5-8
Type Type E
Valid for Froude numbers < 2.5 FROUDE # = 1.26
Conduit outlet invert flush with channel nprap protection
"' Conduit slope is parallel with the channel gradient
If Flow is Supercritical in Conduit, use Da or Ha
Eq 5-7 Da=1/2(D+Yn) <p Eq 5-8 Ha = 1/2 (H + Yn) < H
Yn = Normal depth of supercritical flow in culvert
Yn = 2.29 Yt/Ha = 0_87
Da => 2.52 Ha =>I 2.365
5.6.3 Extent of Protection
Eq s9 L = (1/(2 tan e)) (At/Yt - W)
e = -.6 degrees
v = 10 fps Nonerodable (5 or 7)
Yt = .2.05 it (Tail water depth)
1/(2 tan e) = 5.3 < = = = = FIG 5-9
At = ON = 4.80 sf (required area of flow @ v)
L = -2.17 it
not < 8.25
not > , .. .27.5
4.76 Expansion Factor Calculated
Yt/D Yt/H
0.75 0.84
FIG 5-10
L = -0.52 ft
not < 7:32
not > 24.4
IF 3.83 > 6.0 5.16 > 8.0
Add -1 it Add -2 it
L - -4 L = -2 ft
Outlet Riprap Design
' Worksheet for Circular Channel
' Project Description
Protect File
c:lhaestadlacademic\fmwlwestchaselprojectl.fm2
Worksheet
OUTLET-RIPRAP
Flow Element
Circular Channel
Method
Manning's Formula
Solve For
Channel Depth
Input Data
Mannings Coefficient
0.013
'
Channel Slope
0.010000 f tft
Diameter
33.00 in
Discharge
48.00 cfs
'
Results
Depth
2.05
ft
Flow Area
4.76
ft2
Wetted Perimeter
5.74
ft
'
Top Width
2.39
ft
Critical Depth
2.29
ft
Percent Full
74.70
'
Critical Slope
0.008028 ftlft
Velocity
10.09
ft/s
Velocity Head
1.58
ft
Specific Energy
3.64
ft
Froude Number
1.26
Maximum Discharge
56.89
cfs
Full Flow Capacity
52.88
cfs
'
Full Flow Slope
0.008238 fVft
Flow is supercritical.
I-
U
I
02/05/00
' 10:37:04 AM
Academic Edition FlowMaster v5.17
Haestad Methods. Inc. 37 Brookside Road Waterbury. CT 06708 (203) 755-1088 Page 1 of 1
Permit No.
Facility ID: / /
LAND DEVELOPMENT
Air Pollutant Emission Notice -Dust Control Plan -and -Application
' for Emission Permit
Instructions: 1) Complete one form for each project
7)) For assistance or Information call the Division at (303) 692-3150
3) Mall the forms and $ 100.00 filing fees (checks to be made payable to Colorado
' Department of Public Health and Environment) to:
Colorado Department of Public Health & Environment
Air Pollution Control Division
' APCD-SS-81
4300 Cherry Creek Drive South
DENVER CO 80246-1530
' 1.Permit to be issued to: Willowood Corporation
Federal Tax ID: 84-1518356
2.Mailing Address: 650 South Cherry Street, Suite 435 Denver CO 80246
' 3.Contact Person: Marcus S. Palkowitsh Telephone:_(303) 399-9804
4.Project Name & Location: Westchase PUD
(Attach map locating the project and nearvy s ree
County: Ladmer Section: SW t/a of Sec/ 8 Township: 6N Range: 68W of 6"' P.M.
5-Total Acreage of land in project: 160 Acres
6.Estimated date earthmoving will - Commence: 12/31/2000 Stop: 08/31/2004
7.Number of acres subject to earthmoving -
Maximum, Daily: 10 Acres Total: 150 Acres
8.Acres of roads or parking lots to be paved: -20 Acres
9.Date paving will be completed:_ -August 2003
10.Work Schedule - Hours/day: 8 Days/Month: 20 Months/year: 12
11.Estimated time to complete entire project (includes buildings)_ 4 years to total buildout
12.Estimated scraper hours: 150 hours
13.Brief description of how the project development will occur:
14. Signature of legally authorized person:
Name: Marcus S Palkowitsh Title _Manager
I:\CPUF0RM5.98A\LAND DEV.98A
'FUGITIVE DUST CONTROL PLAN FOR LAND DEVELOPMENT COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Page 1 of 3 AIR POLLUTION CONTROL DIVISION
Applicant: Willowood Corporation
Permit No.
Facility ID. / /
' FUGITIVE DUST CONTROL PLAN FOR LAND DEVELOPMENT
(This must be submitted with the Air Pollutant Emission Notice -and -Application for Emission Permit)
Regulation No. 1 requires that a fugitive dust control plan be submitted by applicants whose source / activity results in
fugitive dust emissions. The control plan must enable the source to minimize emissions of fugitive dust to a level that is
technologically feasible and economically reasonable. If the control plan is not adequate in minimizing emissions a
' revised control plan may be required. The control plan (if acceptable to the Division) will be used for enforcement
purposes on the sources.
Please check the dust control measures which you propose for your activity. The control measures checked will be
enforced by the Division. Use separate sheets if more space is needed. Also note items with an asterisk ('). This
indicates those measures which will probably be required.
' I. Control of Unpaved Roads on Site
A. Watering
' (1) Typical watering frequency: Times / day; or
' (2) Maintain 20 % Soil Moisture Content (Specify percentage)
B. Application of Chemical Stabilizer
' (1) Frequency of Application:
' (2) Type of Stabilizer:
C. Paving: When: Phased (Attach schedule showing when
' paving would occur.)
' Where: Development streets
D. Vehicle Speed Control
' Speeds limited to 20 mph maximum. Speed limit signs must be
posted. Generally 30 mph is maximum approvable speed on site.
E. Gravelling
El F. Other
`.' (Explain):
'FUGITIVE DUST CONTROL PLAN FOR LAND DEVELOPMENT COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Page 2 of 3
.AIR POLLUTION CONTROL DIVISION
' Applicant:
Willowood Corporation
'
II. Control of
Disturbed Surface Areas
' A.
Watering
'
(1) Typical watering frequency: Times / day; or
'
(2) Maintain 20 % soil moisture content.
= B.
Application of Chemical Stabilizer
'
(1) Frequency of application:
'
(2) Type of stabilizer:
C.
Vehicle Speed Control
1
Speeds limited to mph maximum.
I/ D.
Minimize disturbed areas - attach detailed development schedule (with map).
= E.
Revegetation - attach detailed schedule with map (can combine with D
'
above).
(1) Seeding of (annual / perennial) plant (with / without) mulch.
'
Circle appropriate choices.
C (2) Landscaping
-. F.
Furrows at right angle to prevailing wind.
Depth of furrows inches (6" or greater needed)
G.
Compaction of disturbed soil on a daily basis to within 90 % of maximum
compaction (as determined be Proctor Test).
(1) Foundation areas only; or
'
-
(2) All disturbed soil.
H.
Wind Breaks (generally required if adjacent to developed areas and must be
''
in place prior to over lotting).
(1) Type
1
0 (a) Solid: Material:
' (i.e., brick, cement, wood )
(b) Mesh wind screens (state mesh size):
' V (c) Snow fence other fence (specify): Silt Fence
FUGITIVE DUST CONTROL PLAN FOR LAND DEVELOPMENT COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
Page 3 of 3 AIR POLLUTION CONTROL DIVISION
' Applicant: Willowood Corporation
(11. H. Continued)
! (d) Berms: Height: ft.
' (e) Vegetation: Type:
El (f) Other:
(2) Description - Show location, prevailing wind, nearby developed areas.
' Silt fence to be located along south property line Prevailing winds
are from the west. Developed areas are located southwest across
1 Timberline Road. Residential property is located south of site
I. Synthetic or natural cover for steep slopes.
' (1) Type: (netting, mulching, etc.).
' (2) Location: (show on map).
III. Prevention of mud and dirt carry -out onto paved surfaces.
S/ A. Prevention (i.e., gravel entry ways, washing vehicle wheels, cover or do not
overfill trucks):
Tracking control pads are to be located at all entries to the site
' t B. Cleanup of paved Area
(1) Frequency: weekly as needed (generally daily).
' (2) Method (i.e., street sweeper, hose with water, etc.).
street sweeper
`' IV. Other (describe in detail)
7
WESTCHASE P.U.D. EROSION CONTROL PLANS
LARIMER COUNTY, STATE OF COLORADO
STANDARD EROSION CONSTRUCTION PLAN NOTES
I. THE CITY OF GOWNS STORM'llAiEt UTILITY EBO�SION'C IRDL INSPECTOR MUST BE NONR
LEAST 24 HOURS PRIM TO ANY CONSTRUCTION ON MIS S
2. ALL REWIRED PERIMETER SILT FTBIGNC SIA11 BE INSTALLID 1'e)ffi 10 ANT LAND DISTURBING
(STOCK%pNC, STRIPPING. GRADING, ETC.) ALL OTHER REQUIRED 09IXi CONTROL MEASURES
BE INSTALLED AT THE APPROPRIATE TIME IN THE CONSTRUCTIOLI OVENCE AS INDICATED IN TI
APPROVED PROJECT SCHEDULE, CONSTRUCTON PLANS, AND EROSION CONTROL REPORT.
3. PRE-DISTURBPNCE VEGETATION SHALL BE Pf101EC1FD AND RETMNE EREVER POSSIBLE. RE
DISTURBANCE OF EXISTING VEGETATION SHALL BE WLRIED TO THE AREA IRED FOR IMMEDIA
CONSTRUCTION OPERATIONS, AND FOR THE SHORTEST PRACTICAL PERIOD MEN
4. ALL SGLS EXPOSED DURING LAND DISTURBING ACTIVITY (STRIPPING. GRADING, UTIUTI-..,,
IS INSTALLED. NO SOLE IN AREAS WTSIDE PROJECT STREET RIGHTS OF WAY SHALL REMAIN E
DISTURBINGLAND DAYS
PERMANENTEROSION C01170L (E.G SEE /N TMCH, L�SCAPING.EETTC.) IS INSTALLED, UNLESS
OTHERWISE APPROVED BY THE STORMWATER UTILITY.
5. THE PROPERTY SHALL BE WATERED AND MAINTAINED AT ALL TIMES DURING CONSTRUCTION ACT
AS TO PREVENT WND-CAUSED EROSION. ALL LAND DISTURBING ACTIUIIES SHALL BE IMMEDIAT
DISCONTINUED WHEN FUGTVE DUST IMPACTS ADJACENT PROPERTIES, AS DETERMINED BY THE C
FORT COLLINS ENGINEERING DEPARTMENT.
6. ALL TEMPORARY (STRUCTURAL) EROSION CONTROL MEASURES SMALL BE INSPECTED AND REPAII
RECONSTRUCTED AS NECESSARY AFTER EACH RUNOFF EVENT IN ORDER TO ASSURE CONTINUED
OF THEIR INTENDED FUNCTION. ALL RETAINED SEDIMENTS, PARTICULARLY THOSE ON PAVED R0,
SURFACES, SHALL BE REMOVED AND DISPOSED OF IN A MANNER AND LOCATION SO AS NOT TO
RELEASE INTO ANY DRAINAGEWAY.
). NO SOL STOCKPILE SHALL EXCEED TEN (10) FEET IN HEIGHT. ALL SOL STOCKPILES SHALL BE
PROTECTED FROM SEDIMENT TRANSPORT BY SURFACE RONNIENING, WATERING, AND PERIMETER
PENCNG. ANY SOIL STOCKPILE REMAINING AFTER W DAYS SHALL BE SEEDED AND MULCHED.
S. CITY ORDINANCE PROHIBITS THE TRACKING. DROPPING, OR DEPOSITING OF SGLS OR ANY OTHEF
MATERIAL ONTO CITY STREETS BY OR FROM ANY VEHICLE, ANY INADVERTENT DEPOSITED MATE
BE CLEANED IMMEDIATELY BY THE CONTRACTOR -)
E$OSION CONTROL NOTES'
1. DESIGNATED DETENTION POND/SEDIMENTATION BASIN AREAS SMALL BE OVEREXCAVETED TO ALLOW AOCVWl.ATION OF SEDIMENT.
THE VOLUME OF THE DETENTION AREA SHALL AT NO TIME BECOME LESS THAN THE DESIGN VOLUME FOR THE 1W—YR STORM EVENT.
2. ALL DISTURBED AREAS SMALL BE REVEGETATED AND MULCHED.
(SPECIFY SOL PREPARATION, SEED MIX, METHOD AND RATE OF APPLICATION)
3. TEMPORARY STABILIZATION (SEED/MULCHING) SHAJ1 BE INSTALLED WITHIN W DAYS OF PROJECT COMMENCEMENT. TEMPORARY
STABILIZATION IS TO BE IMPLEMENTED OR REMOVED AS REWIRED BY NEW PHASES
i.
a
3 a,
ry
.,.j._�
"-• CIS'. �?'R�
INDEX
SHEET
D�
EC-CVR
EROSIQ
EC-1
EROSIJ
EC-2
EROSI
EC-3
EROSIC
CONTROL COVER SHEET
GONTEOL/PHASING PLAN (SOUTHERN PORTION)
CONTROL/PHASING .PLAN (NORTHERN PORTION)
CONTROL DETAILS
1 City of Fort CWIMR. CWoraEo
PLAN APPROVAL
APPROVED:
CITY MINTER
`•``"
DATE
CHECKED BY:
WATER W wAsnwATfR unuTY
DATE
STCfOINA1fA UlYltt
OAif
N^'s n KMATION
oArt
7j H 1RAr1I0 ENtlXEFR
UA
C EGGED
k:
4
DATE
FVINSTATV`TTFITT IOPIT TYTTT I.
SPL.
1
GOP.
B
M.
BB
JUN.
OCT.
M.
M.
OCT.
PBS.
,UN.
GCB'.
OVBRIAY! GRADING
WDID OMSION CONTROL
PERIMETER BARRIER
VEGETATIVE METHODS
}
RARTP.W. BR09TON CONTROL STRUCTURAL
"y
?
SEDIMENT TRAP/BASIN
-I STRAW BARRIERS
SILT FENCE BARRIERS
BARE SOL PREPARATION
1I.4 EROSION CONTROL VEGETWTTVE
PERMANENT SEEP FLARING
) i
TEMPORARY SEED PIANTING
SOD INSTALLATION
o;gin
h
A
Z
m
Lu
Q
Cc
CL
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U
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W
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Scala:
KA
M TM
EC-CVR
L
No Text
No Text
91ILFR Races E S xNAT
FOR xwE sTAalvwnONax
RPa B
M OE nuro PEA® �\
(GEE A9 NORO)
FCIWm FACE
lr
aM
CgIPA= B �
aMNJLAA KISSING
WIEPoH
1' of iREEBOARD
TOP OF BERM = /899.0
32' BEE HIVE CRATE
FRAME CASs To
TOP
60• PRECAST MANHOLE A'A
GROUTED SLAB TOP
1.5'HR3.0'W
WEIR OPENING
UP - 94.40
10-YR WATER SURFACE = 4894.0
' PRECAST 2- BARREL
sEcnox
INV. J(I' RCP A'V
LY PRECAST 2" BARR0.
30' RCP SCnOM
O O.SOR y
SIDE SUAMEEC
�D 4
�fl 4mZEEND �SE SECTION
VWF MISSING (AS RE".)
m asn ME
(TER)
1
(SIZE AS
i)1Mm FACE
FILTER FABRIC (TYP)-/
.SLOPE 1:1 (MAX) -
STORM SEWER OUTLET
ISOMETRIC METE (P.E.S.)
STORM SEWER
. INV. � 86'..\ _
✓ 1c
.»
IOU-YR WATER SURFACE e=9T.6
. ,Pft[CAiT�'CBASE UNIT ..�,
...
.=, >3
NE(NAH R-2560-C
32 SEE wTE
FRAME CAST INTOTO
TOP DROP BOX OUTLET
1.5'Hx3.O'W
VA)CV SURFACE EUE4 w 4880.4 R.
-
WEIR. OPENING
— - -
.
UP
- 94.40
lb-YR
WATER SURFACE w M94.0 BOTTOM OF POND EIEV. 4880.0 AT 04LET STfXMJRE
-
Y
m. V w 30'
ELE
1W-YR
RCP
90.2 _
ORIFICE PLATE W/ 21" DIA. HOLE REMAINING FILL TO MAIGI EIOSTNG LL ..
2'
SURFACE SOIL
I
B' SAND
BOTTOM OF PONG •- ELEV. - 4889.0
X\` iy
- iii
V CRUSHED 3/4' ROC( BEDdHG V. IN
(AT WHET
6' PERFORATED PIPE = 1887.8S
STRUCTURE)
60
INV.
PVC UNDERDRAIN
- 87.89
611 PERFORATED PIPE TRENCH
SECTION
ORIFICE �DETAILS
j
DETENTION
POND/SEDIMENT BASIN OUTLET STRUCTURElDETAIL
GROUT NOTES
.•... ,"`•w1'
MATERIAL SPECQTCAT[ONS -`.: �C'B�NT SPHCRIGTIU�S-
....,JH W. y._
i,
1. ALL GROUT SHALL HAYS A MINIMUM 28-DAY ). ALL GIT MALL BE OELA•ERED
BY MEANS OF
COMPRESSW STRENGTH EOVAL N 3000 A LOW EBSURE (LESS THAT
10 PSI) GROUT
PS. PUAP NG A'2' AMETER NOZZLE.
2. ONE CUBIC YARD OF GROUT SHALL HAVE 2 NLL 0 TH PBETRARON OF
'
THE WOUT INTO
A MINIMUM
OF SIX (6) SACKS OF ; WE BOULDERS SMALL BE REWIRED.
TO
PORTLAND CEMENT. ACHIEVFTHIS, GROUT SHALL BE
WTH THE
INJECTED
-
j
STARTIM NOZZLE NEAR
3 TYPE II CEMENT SHALL BE USED A _ "AND RAFRING IT AS GROUT FILLS
THE BOTTOLI
AND IS
7I
MAXIMUM OF
25% FLY ASH MAY BE NBRATp INTO PLACE USING A
PENCIL
SUBSTTUTED
FOR THE PORTLAND WBRATCL
CEMENT. 3. AFTER 6CEMEHT, .EXPOSED
BOULDER FACES
•
SHALL BE CLEANED MN A WET
4. THE AGGREGATE SHALL BE COMPRISED OF 1
BROOM.
70R NATURAL SANG (FINES) AND 305 .4. ALL GROUT BETWEEN BOULDERSSHALL
SHABE
BE
3/8 it ROCK (C6ARBE) - FINISHED WITH A BROOM FINISH.
!
5 THE SLUMP SHALL BE 5-INCHES TOYF, 5. ALL Mt UT nHALL 9E SPRAYED
MTH A CIEM
'i 6f J CHES jy -." LIQUID MEMBRANE WRING COMPOUND
AS
. , SPECIFIED IN ASIA CIDOS .
8. 1/J •lTRAINMENT SHALL BE T 1/2 PERCENT* xe:(SPEGAL
1 1 PERCENT - •f PROCEDURES SHALL
BE REWIRED FOR
MOD I RACEAENT MEN THE
T N WRVOL SHRINKAGE AND IY2ACGNG•I.S TEMPERATURES ARE LESS THAN
AIR
SOT OR
POUNDS OF FIBERMESH OR EQUIVALENT OREAITR THAN 907. CONTRACTOR
OF,GRWT. "I OBTAIN PFUOR APPROVAL FROM
STALL
THE DESGN
-
SHALL BE USED PER CLERIC YARD
'ENGINEER OF THE PROCEDURES
TO BE USED
- FOR PROTECTING THE GROUT.
i 1
,
NW)
SEMON B-B
STORM SEWER OUTLET
ISOMETRIC VIEW (CONCRETE HEADWALL)
City of Fart CMlins, Colorado'.
PLAN APPROVAL
APPROVED:
an ENFAXEFn
DALE
CHECKED BY:
VMTER A WASRVARR Unun
DAIS
CHECKER BY:
SN11MA" UTILITY
DAIS
CHECKED BY.
PARKS It RECK naI
DATE
CHECKED BY.
WAPFIC MEMOIR
' DATE
CHECKED BY:
DATE
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BLOCK 7 _/ izv %i.m s: > /�1, `/ ,1 /' \ LOC 1 7 19 11 I i Ixwy s 33
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proe.. +34, /�\�' �J e. a 4 10 8 N• PARK Of@l9IGE 4 . 4 � lr� _�'�4 i r i a'MGH ECW FENCE
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18 ` �//// 4aiR/ Z / ��EEEi���i __ A&T
ENTRY FEATURE —' _l _ \ at«4 I / O / �'7 e,elS4
SHT 7, A / 1 A2 ; ' , . \ �`J/ / , 7 eaid54 ,( / , 43 - 7 50' x 150' �., =I.14 4 ,
NEIGHBORHOOD CENTER, '� 1.50V //y\ / QQQFFI DCK 1
SECOND USE SITE, • `(/\a 1 4; / I 4 4 \� \` // 15 / 4`,m4 / M.�4 ' 7 I x1.7b4 /� • S, _ / I
CITY FIRE STATION OR aai 4 • F e, 4/ 1 \ \/4 a 4 f , a.ml 4 /
AN ACCEPTABLE a5m 4 \ / / / / \ / '
10 a�� �\ SINGLE F�ILY
USE SUCH AS: 4eee 4 + �emR
INSTITUTIONAL, CIVIC,'== —'
PUBLIC, COMMERCIAL r a R RETAIL USES.y, J _/1 ,:'xc 4 NIEV
4.e1B.� �ir' jam' 12�,
LIMITED MOVEMENT EN y ...;.� >.R2fe4 t ,r ` \ 2 4..
RIGHT IN I RIGHT OUTIONI t�Aae2fl x : a` artxseics �:�/a`'O`Q-S/re 4; 1`` ��
1u4mNwWE FamRR
`]-41 LF1O4IC�CWK W KIIEOFA9
UNNINPWNEF 5716 G"
LIRIMER =NT( \ ' O YIQ
13
O
NEIGHBORHOOD CENTER, I QC$ t. ('`— 39 - ',x / \e :ei 4''ti 4 72 \ TRACT I
J.ui"4 RAC
PRIMNRY USE: I 1asa24 �yFy� LCT / 9xwx y ' xtw 4 I 24.1 s II 1
CHURCH SITE 24 spixet ' I ,414,••awxs t&MD 16 eMiOPE TYPI ,
j \Y// / zle.l s t � 1
. a 294 -
10TOI
spaosS i i 9 k «84 am 4 .D / / I I /� WATER C�1A111V POND
,2O aw. aF 1' / /xoaxal�Flll
i" 3 / ywaa q < men 7 'S
OPEN WI �eti 4 ra;\ / t•\ S4m5 4 / ' ' 1I I / ;
i
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IN
_ _ _ _ _ _
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_�•� — _ _---J _;
2.54 ACS. TOTAL DEVELOPMENT AREA w
�' 1 EAselazr \ OF ESTAMILE F SSILOTS THAT CREEK
SERVOHIN R SETBACK
114 PRELIMINARY
w Mo>n RFSIR/,IKK: ENTRY F81 18 E \\ ` �1 THESE TWO
FOSSIL CREEK RESERVOIR ARE
17.94 CO SITE PLAN
-- ENTRY FEATURE SM7,8/URE "< GarEWAY1.C(Jklicl F. eO,pRp px EXISITNG BARN MESETWO HATCHED AREAS ARE 17.94%OF
Uarrtsro eE OEaor®ro,,uav ylOtagNRFAifa THE SETBACK AREA (14.16,AQ.).
P.n).cmI MArts SM7,C/1&2 NaEnFS iolwx N.wfnwilMx vsMN aultt ,1� Imw.
uxuER mUun txF vuoPFNrrNNo xm aacwm LL—�� Pu
IRNNY RWDfN01A 11F PROIEFIY.
Rana
i.. LEGEND
WESTCHASE P.U.D.
Ill/ F)CIPC RH GVIC%
\ MRwu FORT COLLINS COLORADO
U RMw NIGIonM
R EU loR 2RU 2 a•8 �
SCALE: 1' = 100'
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'Q`
Ell
COMMERCLAL GENERAL NOTES
lr�
.,
PROJECT INFORMATION LEGEND
SM U(ZCIKII l.i4N,RMW
FIDIW LY1 x PA1
1y.I]!$Z31W. M
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RESIDENTIAL GENERAL NOTES
l�fA1f RH GVICN
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1
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n]wreo0rworoa.KRE ,RE awc
ffE TCHASE P.U.D.
FORT COLLINS COLORADO
0 11 m "0
SCALE: 10. 2W
ID UCA'R
vunrzvocww+w
IN E QlPM 9Rf. YIF 6Y
Umm. W 010
m,YP6r
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PRELIMINARY
SITE PLAN
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/ / WACE /. I' / 1MMM ME INMII LII R)
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'85AC$
END OF 6' SOLD WOCD!
FENCE WITH 7 STOW'
Ptl1N25 EVENLY SPACED.
-- -
III
NHDHBORHOOD CENTER,
P`-/
i \ _
2.36 acs CITY FIRE SIMKKJ
AND DAY CPRE OR OTHER
_ _
ALLOWABLE USES AS DEFINED � J/
� � l' E lY^ �'—� —___— — -- � /E
43-1
80 E isilHG A / ��
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C FX1
57 b P WIK
v n r. ��—� II i T� INGLE- ILY— — A`
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11M13E1(lINE Ll
uTm vWTL
URIMMPIMER CW ry I/ l0 �1RNL
p
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�e
I i .--------- ------- � (, I D LE
r I I
r / ,r e dakero,WY �5 STORM WATER
DETENTION POND
IND FILWG
LANDIRE AS DEFINEF IN ME TI � � K D ��°I •I //
FOSSIL CREEK RESEVOIR V+EA NAN L — — �. �� /. 01tN 5YIGF 1'
I I
.j
q
P
- -
-
___ 254 ACS TOTAL DEVELOPMENT AREA
to «camRN>ryR OF ESTATE LOTS THAT ARE WITHIN THE
-" _- _ __ I j\\ 1/4 MILE FOSSIL CREEK RESERVOIR SEib4C
¢ Rorn IEYRIMK:N $M 7Ib - SM7/b slc W6 AfLOGT]I!. `3p R?'n �r/AEpN ExISIrNG BARN THESE TWO HATCHED AREAS ARE 77.94%
A I>tmrsroNlxscEmroruoA• NNCwr T.Tm THE SETBACK AREA T 4.16 ACS.).
WFCIfSroIIpN NA'AM•MIIN E UER CWNx
.few s`w✓S ne maeelnao NDnax wo
Twsrxan wa. n[nmrertr. LEGEND
i'i FE6ING M1EES
WESTCHASE P.U.D.
1ST FILING
[R] .M. I FORT COLLINS COLORADO
NM��N
�mKE�EM w
7 0 66 I W 700
• ""50'v1 Al A° M — 1 o l 2287
SCAM: V 100'
L
VF RIPLEY
I.6¢ItltB. M.
;1.11= =
imp
FINAL
SITE PLAN
win
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LOTS 9, 10, 1216 PLANT LIST (screened area)
WAKSNME
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WESTCHASE P,U.D.
1ST FILING
FORT COLLINS COLORADO
o
IN
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107
2287 SCAE'''`2W
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COMMERCIAL GENERAL NOTES
PROJECT INFORMATION
M Irx RCIKK16.16 K R 65 W
FMISINGxCWIG'. FAA RORCND xCNG:
M
WIN 4Rf K45
1562"ACRS
IOIN Dfl{I PROD
WSVIMDL LOn
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WIX " 41
OXOPSNAA
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TOWRA DRGY
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RESIDENTIAL GENERAL NOTES
LEGEND
MM•KKVM"fMW w.W
O
i/VI FRCl01R
RMV
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WESTCHASE P.U.D.
1ST FILING
FORT COLLINS
M-107 2287
COLORADO
o 100 mo ao
SCAU:,--2w
PmRa 80
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