HomeMy WebLinkAboutDrainage Reports - 03/09/2016North Star
aaa,,,r design
700 Automation Drive, Unit I
Windsor, CO 80550
Phone: 970-686-6939
Fax: 970-686-1188
March 4, 2016
Dan Mogen
City of Fort Collins Utilities
700 Wood Street
Fort Collins, Colorado 80525
Mr. Mogen,
City of F Collins ApprovedAppro9yed Plans
Approved by:
Date: 3 at =tt<
This letter is to address the drainage for Lot 3, Rigden Farm 15' Filing which is proposed
to be developed as a dental clinic (Caring Smiles). It is proposed to construct a single
building and a parking lot at the southwest corner of Custer Drive and Illinois Drive.
This lot is located in Basins A and B as delineated in the CLC Associates in a report
entitled "Preliminary Drainage Study for Rigden Farm Tract A" and dated December 8, 2009.
Basin A (total of Basin AI and Basin A2) will have no change in impervious coverage from
that presented in the CLC report and the portion of the basin that is on Lot 3 will have an
imperviousness of 39% (versus 59% from the CLC report). Basin B of the CLC report
assumes an impervious coverage of 90% on the lot. Actual imperviousness for the portion of
the Caring Smiles site that fall in Basin B (total of Basin B 1 and B2) have been calculated to
be 69% (see attached calculations). Therefore, imperviousness is in conformance the CLC
Study and no further runoff calculations were compared. Runoff calculations were prepared
in order to size the inlets and pipes.
In the CLC report, runoff from Basin B is directed to an existing area inlet at Design Point 2
the northeast corner of Lot 3. A concrete trickle pan exists along the north side of lot 3 to
intercept runoff and convey it to the existing inlet. This trickle channel also accepts runoff
from Lot 2 on the west side of Lot 3. Runoff on site has been modified slightly to direct
runoff from the parking lot to an area inlet which collects the runoff from the parking lot and
conveys it in an 8" pipe to the existing inlet at the northeast corner of Lot 3. This runoff then
flows north and into the existing combination inlet in Custer Drive.
o
1
Basin B incorporates two required water quality enhancement elements which are
interlocking permeable pavers and a rain garden. The permeable pavers are located in the
north most portion of the parking lot and encompass 1904 square feet. The rain garden is
' located near the south east corner of the parking lot and provides treatment for the runoff
from the parking lot prior to the runoff entering the area inlet and the storm system. Refer to
the LID Table at the end of this report for a summary of the treatments and the areas treated.
' A minor modification is being requested for the rain garden to allow the side slopes to be
' constructed at a slope of 3.6:1 rather than the standard 4:1 side slopes. This modification is
being requested due to the site area constraint.
' Runoff in Basin A is not altered from the CLC plan and will continue to flow to the existing
swale on the south or to Illinois Drive on the east.
' A small Basin C was defined to show the amount of water that is discharging directly to
' Illinois Drive from this site. This basin is comprised entirely of landscaped area and
generates approximately 0.1 cfs in the 100 year storm event.
' The CLC Report references "Rigden Farm, Filing One Drainage Report (Master)" prepared
by JR Engineering dated October 1999 that states that detention for this site is provided in
' Fossil Creek Reservoir and water quality for Rigden Farms 15th Filing is provided in Water
Quality Pond #2. Therefore, detention and water quality for Lot 3 is provided off site and no
onsite facilities will be provided
Please contact me if you have questions or need additional information.
' Sincerely,
' Patricia Kroetch, P.E.
------...L-_-------L--------
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Profile Report
Engineering Profile - Profile - 1
(Untitledl.stc)
Inlet B2
OF-3
Rim: 29.80 ft
/ Rim: 29.50 ft
Invert: 27.14It
/ Invert: 26.00 It
30.00
25.00
-0+50
z
0+00 0+50 1+00
Station (ft)
Bentley Systems, Inc. Haestad Methods Solution Bentley StornnCAD V8i
Untitledl.stc Center [08.11.00.401
9/10/2015 27 Siemon Company Drive Suite 200 W Page 1 of 1
Watertown, CT 06795 USA +1-203-755-1666 -
Profile Report
Engineering Profile - Profile - 2 (Untitledl.stc)
35.00 ... .._.............i .. .. ............. ...............;
30.00
25.00
-0+50
.s
Inlet Al
Rim: 30.70ft :Flared End
Invert: 28.70 ft `Rim: 30.20 ft
/ Invert: 28.30 ft
0+00
Station (ft)
0+50
Bentley Systems, Inc. Haestad Methods Solution Bentley StormCAD V8i
Untitledl.stc Center [08.11.00.401
9/10/2015 27 Siemon Company Drive Suite 200 W Page 1 of 1
Watertown, CT 06795 USA +1-203-755-1666
INLET ON A CONTINUOUS GRADE
Project: Caring Smiles
Inlet ID: Area Inlet in Basin Al
rt—Lo (C)—T
H-Curb H-Vert
Wo
W
g (G)
oral Depression (additional to cermroous gWer depression'a'fmm'Q.A➢oW)
oMt 1 u 1,er of Units in Bw trial (Grate or Cv Opening)
agm of a Single Unit Wet (Grade or Cub Operirg)
of a Urd Grate(canot be greater OonW from Q-Alow)
Factor for a Single Unit Grab(typiW rum vaare=0.5)
Factor for a Single Unit Cub Opening (typical nin. vale = 0.1)
atocst=
No =g2.00
Lo=N
Ws=bgghg
CrG=bggirg
CCC =
2.0V2,,�C
inches
0.10
Itreet N mufics: OK - 0 c nuotanum albowgbls from sheet'O-Allow'
Wal Inlet interception Capacity
Dial Inlet Carry-0 er Flow (flow bypassing Inlet)
eptum Percentage=Q^=
Q=
Qe =
C%=
MINOR
0.30
0.0
IN
MAJOR
0.82 ofs
QO or s
100 %
Inlet C.1Asm, Inlet On Grade 91102015, 9:33 AM
AREA INLET IN A TRAPEZOIDAL GRASS -LINED CHANNEL
' Caring Smiles
Inlet B2
T,..,. Grass Type Lintifin0 Mannings n
I T ....... � o fi!0.06
m
B 0.00
C 0.033
Of � dsr,{� E 0.03
�T—_ _� I i 0.024
PT_B_
NRCS Vegetal Retardance (A, B, C, D, or E)
A. 8, C, D or E
C
in9 s n (Leave cell Of 6 bladt to manually enter an n value)
n =
see Mails belw
rol Invert Slope
So=
D0001
ftM .
Bdmm Wid6t
B=
8.00
it
eft Side Slops
Zi =
4.00
fbft
'ght Side Slope
Z2=
4.Op
ft!fl
me of the followwy soa
t3 One:
Soil Type: M,. Velocity N.,,.) M. Froude No. IF—)
Qom,
Sandy 5.0 fps 0.50
0 non-Sw�dy
N 7Zfps 0.80
Minor Storm Major Storm
. Pdlowable Top Width of Channel for Minor d Major Storm
Teuv,=1
14.00 � �1
14.00
fast
Nlawade Wafer Depth in Channel for Minor d Major Storm
ds,, =1
1.00
1 1.00
fort
STORM Allowable Capacity is based on Depth Criterion
STORM Allwable Capacity is based on Depth Criterion
i Peak Flow
Depth
allowable capacity GOOD - greeter than flow given on sheel'O-Pock'
0.32
Q. =1 0A0 1 0.30 ch
d=j 0.50 1 0.08 feet
Inlet B2.)dsm, Area Inlet 2111112016,213 PM
AREA INLET IN A TRAPEZOIDAL GRASS -LINED CHANNEL
Caring Smiles
Inlet B2
nlet Design InNmwi*In ut
Type of We Inlet Type = User -termed
of Inclined Greta (must to <= 30 degrees)
of Grate +---�
h or Grate
Area Ratio
d of Inclined Grate
liraFactor
Oisoltatflarge Coeffdenl
a Coefficient "+•_-. `v ..+^'
colefficient
Mil
r Depth at Wet (for depressed Wets, 1 foot Is added for depression) d =
II Inlet Interception Capacity (assumes clogged condition) Q.
Capacity IS GOOD for Minor and Major Stoma (> Q PEAK) Bypassed Flow, Q. _
Capture Percentage a Q.IQ. = CX
A.
0.5d
0.98
a.27
5.73
0.00
0.00
100
100
:fs
fs
L
Inlet B2.stsm, Area Inlet 2/16/2016, 213 PM
Design Procedure Form: Rain Garden (RG)
Sheet 1 of 2
Designer: Patricia Kroetch
Company: North Star Design, Inc
Date: February 10, 2016
Project: Caring Smiles
Location:
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area, I,
I, = 69.0 %
(100% it all paved and roofed areas upstream of rain garden)
�'. B) Tributary Area's Imperviousness Ratio (= I j100)
i
T
F:- C) Water Quality Capture Volume (WQCV) for a 12-hour Drain Time
WQCV . `� F. 0 22 " 5;. watershed inches
,.. (WQCV=0.8•(0.91"i°-1.19*e+0.78"i)
D) Contributing Watershed Area (including rein garden area)
Area = 23,515 sq it
E) Water Quality Capture Volume (WQCV) Design Volume
Vwocv =`- 424 ''i cu it
Vol = (WOCV / 12)' Area
F) For Watersheds Outside of the Denver Region, Depth of
do = in
-_
Average Ruoff Producing Storm
G) For Watersheds Outside of the Denver Region,
Vwo orHea =' 'dT 7 cu ft
Water Quality Capture Volume (WQCV) Design Volume
H) User Input of Water Quality Capture Volume (WQCV) Design Volume
Vwoci user = cu it
(Only if a different WQCV Design Volume is desired)
2. Basin Geometry
-
A) WQCV Depth (12-inch maximum)
Dwocv = 10 in
B) Rain Garden Side Slopes (Z = 4 min., horiz. dist per unit vertical)
Z = 3.60 ft / ft Z 4:1
(Use "0" 4 rain garden has vertical walls)
C) Mimimum Flat Surface Area
Any, _".'' 283 r a sq It
D) Actual Flat Surface Area
AKr,,,i = 351 sq it
a-
E) Area at Design Depth (Top Surface Area)
Arw = 700 sq it
F) Rain Garden Total Volume
VT=; 438 .�. w it
i
(Vr= (Arm' Ax ) / 2) " Depth)
3. Growing Media
Choose One
18" Rain Orden Growing Media
Q Other (Explain):
4. Underdmin System
A) Are undardrains provided?
Choose One
YES
O ND
B) Underdrain system orifice diameter for 12 hour drain time
) Distance From Lowest Elevation of the Storage
y= 1.7 ft
Volume to the Center of the Orifice
H) Volume to Drain in 12 Hours
Vold +?' 424 = =cu It
iii) Orifice Diameter, 3/8" Minimum
Do = ,, 0 46�' in
s:
' Rain Garden.xlsm, RG 2/10/2016, 11:35 AM
-
Design Procedure Form: Rain ,Garden (12G)
Sheet 2 of 2
Designer: Patricia Kroetch_
Company: North Star Design, Inc
'
Date: February 10, 2016�
Project: Caring Smiles
Location:
s:
son
S. Impermeable Geomembrane Liner and Geotextile Separator Fabric
Choose One
Q YFS
�.
g;
A) Is an impermeable liner provided due to proximity
Q NO
of structures or groundwater contamination?
_
PROVIDE A 30 MIL (MIN) PVC LINER WITH COOT CLASS B
GEOTEXTILE ABOVE IT. USE THE SAME GEOTEXTILE BELOW
THE LINER IF THE SUBGRADE IS ANGULAR
s 6. Inlet / Outlet Control
Choose Onc
�Q Sheet Flow- No Energy Dissipation Required
A) Inlet Control
Concentrated Flow- Energy Dissipation Provided
Choose One
.
7. Vegetation
Q Seed (Plan for frequent weed control)
([� Plantings
e
Q Sand Grown or Other High Infiltration Sod
�.
8. Irrigation
� One
ESA)
Eo
Will the rain garden be irrigated?
Notes: Water quality extended detention is provided downstream in the subdivision pond & not included in this design.
son
r':a
sr..� �dk m..,x "�' sa.:�:�„4.._,...a. •� ::�'� may° `
Rain Garden.xlsm, RG 2/10/2016, 11:35 AM
Stormwater Detention and Infiltration Design Data Sheet
L<_%nrkhnnk thrt!t-rtt.n '1G�!Shee2 ?'✓a[Ct'.C^c
Stormwater Facility Name: Caring Smiles
Facility Location &Jurisdiction: Fort Collins, CO
User (Input) Watershed Characteristics
Watershed Slope=
0.006
ft/ft
Watershed Length -to -Width Ratio=
1.00
L:W
Watershed Area =
0.53
acre
Watershed Imperviousness=
69.0%
pen
Percentage Hydrologic Soil Group A =
0.0%
pen
Percentage Hydrologic Soil Group B =
0.0%
pen
Percentage Hydrologic Soil Groups C/D =1
100.0%
pen
Location for 1-hr Rainfall Depths (use dropdown):
'User input
User Input: Detention Basin Characteristics
WQCV Design Drain Time = 40.00 hours
After completing and printing this worksheet to a pdf, go to:
httos://maperture.digitaidataservices.com/xvh/?viewer--cswdif,
create a new stormwater facility, and
attach the pdf of this worksheet to that record.
rr
rr
tr
�--
Routed H dro ra h Results
Design Storm Return Period =
One -Hour Rainfall Depth =
Calculated Runoff Volume =
OPTIONAL Override Runoff Volume=
Inflow Hydrograph Volume =
Time to Drain 97%of Inflow Volume =
' Time to Drain 99%of Inflow Volume =
Maximum Ponding Depth =
Maximum Ponded Area =
Maximum Volume Stored -
WQCV
2 Year
5 Year
10 Year
25 Year
50 Year
100Year
0.53
0.98
1.36
1.71
2.31
2.91
3.67
0.012
0.029
0.045
0.060
0.087
0.113
0.148
0.012
0.029
0.045
0.059
0.086
0.113
0.147
1
1
1
1
1
1
1
2
2
2
2
2
2
2
0.22
0.53
0.81
0.87
0.91
0.95
0.98
0.010
0.013
0.016
0.027
0.040
0.052
0.062
0.002
0.006
0.010
0.011
0.012
0.014
0.016
n
cre-it
cre-ft
cre-ft
lours
lours
t
acres
cre-ft
SDI -Drain time check_FC_Rainfall.xlsm, Design Data
2/22/2016, 1:52 PM
Stormwater Detention and Infiltration Design Data Sheet
1
1
1
1 SDI —Drain time check_FC_Rainfaii.xlsm, Design Data
2/22/2016, 1:S2 PM
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Example Erosion and Sediment Control Escrow/Security
Calculation for The City of Fort Collins
Project: Caring Smiles, Lot 3 Rigden Farm Filing 15 Disturbed Acres: 0.66
-� ,c�
w �x�
BMP Amounte E N A1
Estimated Unit
�ua�.
Total
EROSION CONTROL BMPs Units Quantity Price
Price
Silt Fence L.F. 610 $3.00
$1,830.00
Rock Sock each 5 $85.00
$425.00
Vehicle Tracking Control Pad each 1 $1,500.00
$1,500.00
Concrete Washout each 1 $1,200.00
$1,200.00
Inlet Protection each 2 $210.00
$420.00
(add all other BMPs for the site in this list) Sub -Total:
$5,375.00
1.5 x Sub -Total:
$8,062.50
Amount of security.
$8,062.50
��„u. ��
__mReseedmgAmount'
Total Acres x Price/acre:
mm
$792.00
Unit Price of Seeding per acre: $1,200.00 Sub -Total:
$792.00
1.5 x Sub -Total:
$1,188.00
Amount to Re -seed.
$1,188.00
Minimum escrow amount.
Erosion Control Escrow. $8,062.50
"77ee amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times
' the cost to re -vegetate the disturbed land to dry^ land grasses based upon unit cost determined by the 04, s Annual Revegetation and Stabilization Bid,
.whichever is greater. In no instance, will the amount of security be less than one thousand five hundred dollars (S1,500) for residential development or three
thousand dollars ($3,000) for commercial development"
3/12/2015 2:32 PM NAW-05CwWSmlieskdrainagelE.a E..X
STORMWATER MANAGEMENT CONTROLS
1. Written Analysis
The soils on this site are classified by the USGS Soil Survey as Nunn Clay Loam
and are classified in the hydrologic group C. The soils are described as having a
slow infiltration rate when thoroughly wet and the hazard of water erosion is
moderate and the hazard of wind erosion is low.
The site is surrounded by lots undergoing development and existing public and
private streets. A detention pond exists on the east side of the site. The
construction shall utilize silt fence around the perimeter to control sediment
transport from rainfall and from wind. Rock socks will be utilized in the existing
detention pond, around existing inlets and in the newly constructed concrete
channels to capture sediments that are not fully contained by the silt fence
placement.
The site will also utilize two vehicle tracking control pads to minimize sediment
from being tracked onto adjacent pavements. Sediment that is tracked will be
removed and placed within the site or permanently disposed of offsite. A concrete
washout will be used on site during the concrete placement. All hardened concrete
will be disposed of offsite. These BMP's have been located on the site map but
may be located as construction dictates due to the fact that the site is very small
and these BMP's will need to be placed by the contractor in locations that are
most beneficial and will minimize disruption of adjacent traffic.
Permanent erosion control consists of covering the soils with a building, concrete
walks, concrete drives and sod. No soil will be left exposed to erosion after the
construction is complete: Refer to the landscape plan for areas of and instructions
for placement of sod and soil amendments required prior to placement of sod.
Refer to the erosion control plan for this site for the timing of the construction
phases and the sequential installation of all BMP phasing for this site.
Refer to the end of this section for the Erosion Control Surety calculations.
2. SWMP contact information
' Permit holder:
Name:
' Address:
Phone Number:
Email Address
Appointed agent:
' Name:
Address:
' Phone Number:
Email Address:
3. Identification and location of all potential pollution sources
Potential' Pollutant Source Activity
Potential Pollutant Generated
Applicable to
this project
Disturbed Areas
Sediment
X
Soil stockpiles
Sediment
X
Travel to adjacent public streets
Tracked sediment
X
Contaminated soils
Sediment, chemicals
Loading and unloading chemicals
Chemicals
Unloading of building materials
Trash, debris
X
Outdoor storage of chemicals
Chemicals
On site equipment maintenance
Oil, grease
On site equipment fueling
Diesel, gasoline
X
Dust generating activities
Particulates, sediment
X
Use of fertilizer, pesticides, herbicides
Fertilizer, pesticides
Use of detergents, solvents, oils
Detergents, solvents, oil
X
Waste dumpsters, waste piles
Chemicals, trash, debris
X
Concrete washout
Concrete, sediment, wash water
X
On site equipment washing
Detergents, oil
On site asphalt batch plant
Asphaltic cement, sediment
On site concrete batch plant
Cement, sediment
Portable toilets
Domestic sewage
X
' 4. Best Management Practices (BMP's) for Stormwater Pollution
Prevention
' Structural Practices for Erosion and Sediment Control
Structural practices for the site will consist mainly of silt fence and rock sock filters and
' are described in detail in the following paragraphs. These BMP's are expected to change
as the construction progresses and it is the responsibility of the contractor to ensure
appropriate BMP's are in place and/or removed at the appropriate time in the construction
' sequence. All temporary and permanent erosion and sediment control practices must be
maintained and repaired as needed to assure continued performance of their intended
function.
Silt fence and rock sock filters shall be in place prior to commencement of construction
activities. During clearing and grubbing necessary for silt fence installation, all cleared
material shall be placed on the uphill side so that if erosion occurs from the cleared
material, the sediment will be trapped and not transported downstream. Rock socks shall
be implemented in the existing curb line as shown on the Drainage & Erosion Control
' Plan.
All BMP's shall be installed per the details shown on the construction plan set.
' Temporary & Permanent Structural BMP's:
Structural BMP
Approximate location on site
Applicable to this
Project
Silt Fence
Site perimeter, refer to site map
X
Straw bale dams
Rock Socks
At new sidewalk culverts, at existing inlet,
refer to site map
X
Earthen diversion dams
Vegetated swales
Rock Berm
East boundary, of site, in existing det pond
X
Pipe slope drains
Geogrid
hilet/outlet protection
Culverts
Riprap
Erosion control mats
Inlet protection
Vehicle Tracking Control Pad
At site entrances, refer to site map
X
Concrete Washout
To be located by Contractor, near site entry
X
Non -Structural Practices for Erosion and Sediment Control:
Soils exposed during the earthwork phase and landscape prep phase shall be kept in a
roughened condition by ripping or disking along land contours until mulch, vegetation, or
other permanent erosion control is installed. No large amount of soils (in excess of 15
' yards) will be allowed to be stock piled on site. Overburden from the utility pipe
trenching will be piled adjacent to trenches upstream of sediment controls and will be
replaced in the trenches within 72 hours.
Excess excavated materials from the demolition and grading phases of the project that
cannot be reused on site will be exported as it is excavated. This includes any asphalt
pavement from the existing site that is to be removed.
A vehicle tracking pad will be installed at a location most beneficial to the site
construction as determined by the contractor. Vehicles will not be permitted in the
excavated area if soil is muddy. Gravel sub base will be placed and compacted in the
areas indicated for pavement following excavation. In the current pre construction state
I
the site enables tracking of silt onto the adjacent streets during wet conditions. During
1 construction activities the street will be monitored for foreign debris tracked out of the
site and mechanical sweeping and clean up will be performed as needed.
' No area shall remain exposed by land disturbing activity for more than thirty (30) days
before required temporary or permanent erosion control (e.g. seed/mulch, landscaping,
etc.) is installed.
Temnorary & Permanent non-structural BMP's:
Non -Structural BMP
Approximate location on site
Applicable to this
Project
Surface roughening
Entire site
X
Soil stockpile height limit (less than
10' )
Perimeter vegetative buffer
East boundariyof site
X
Minimization of site disturbance
Mulch
Seed & mulch stockpiles after 30 days
Stockpile toe protection (silt fence,
wattles or ditch)
Preservation & protection of existing
East boundary of site
X
vegetation & trees
Good site housekeeping (routine
Entire Site
X
cleanup of trash & constr debris)
Sweeping & scraping of hardscape
On and off site pavements
X
areas
Heavy equip staged on site, properly
maintained & inspected daily (no
Staging area
X
onsite maintenance)
5. BMP Implementation
1) Phased BMP Implementation
BMP's are expected to change as the construction progresses and it is the
responsibility of the contractor to ensure appropriate BMP's are in place and/or
removed at the appropriate time in the construction sequence. A construction
sequence schedule has been included on the Erosion Control Plan in the construction
plans for this site.
All BMP's shall be inspected and repaired or replaced as required to satisfy the
conditions of the Stormwater Discharge Permit. All BMP's must be maintained and
repaired as needed to assure continued performance of their intended function. Refer
' to Appendix D for the BMP schedule and estimated costs.
1) Mntarinlc Flnnrllina and Snill Prevention -
Materials Handling & Spill
Approximate location on site
Applicable to this
Prevention BMP
Project
Portable toilets, anchored &
Contractor to determine
X
located away from drainages
Fuel storage located in bulk tanks
with secondary containment &
spill kit
Mobile fueling performed at least
200 feet away from drainages &
Contractor to determine
X
fully attended
Fertilizers, form oil, solvents,
cleaners, detergent stored in 55 gal
Contractor to determine
X
or smaller containers, kept in
storage units
Dumpsters containing used
chemicals containers & liquid
Contractor to determine
X
wastes kept covered
Equipment cleaning (on site) uses
no detergents & flows to onsite
retention basin
In case of a release of firel or other
chemicals, absorbent booms or
earthen berms will be immediately
Location of spill
X
constructed to contain the spill &
prevent runoff to adjacent surface
waters
MSDS sheets for onsite chemicals
will be kept at the construction
Contractor to determine
X
trailer to facilitate spill response &
cleanup
3) Dedicated Asphalt or Concrete Batch Plant
Not proposed with this development
4) Vehicle Tracking Pad:
' Vehicle tracking control pad shall be installed wherever construction vehicle access
routes intersect paved public roads. Vehicle tracking control pads shall be installed to
' minimize the transport of sediment (mud) by runoff or vehicles tracking onto the
paved surface. Any mud tracked to public roads shall be removed on a daily basis
and after any significant storm that causes sediment to be transported. It is unlawful
to track sediment/mud onto public streets and may be enforced by the City of Fort
Collins, by the State of Colorado or by the EPA.
5) Waste Management and Disposal:
Portable toilets will be anchored & periodically maintained by waste management
company. Dumpsters on site will be covered & periodically emptied by waste
management company. Concrete waste will be allowed to harden and then will be
removed from site.
No washing activities will occur on site.
Location of the concrete washout is shown on the site map. The washout will be
sufficiently deep to accommodate all anticipated concrete truck wash water. Waste
concrete will be allowed to harden and be removed from site periodically as the
washout reaches 50% of its capacity. Truck wash water will not be allowed to reach
the curb & gutter or any other water course.
G) Groundwater and Stormwater Dewatering:
No groundwater was encountered during soils exploration therefore ground water is
not anticipated to be an issue. If groundwater is encountered a groundwater discharge
permit shall be obtained and a detailed report shall be completed describing the
location and the route of where pumped groundwater will be conveyed and the
measures taken to prevent the transport of any pollutants to downstream waters.
7) Inspection & Maintenance:
It is required that routine site inspections are performed to effectively address
maintenance and repair of Best Management Practices (BMP's). The site inspections
are to be performed by the contractor or an inspector designated by the administrator
at a minimum of once every fourteen (14) calendar days on active construction sites
and after any significant storm event (an event causing runoff). As part of the site
inspections the inspector is required to keep documentation of
all inspections and BMP maintenance, including an updated Site Map indicating new
BMP's or the removal of BMP's since the previous inspection.
Any maintenance, repair, or necessary installation of BMP's that are noted during
the inspection must be completed within seven (7) calendar days from the date of
the inspection
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r January 30, 2009
' October 19, 2009
December 8,` 20.09
Prepared for.'
Arrrlstfotig Developmerit:Properties, inc.
999 Eighteenth Street; `Ste. 2700
Denver, CO 80202 ,
ol
Phone:-303:352 4600
Prepared.by
t CLC Associatesi,tnc:
' .8480 E. Orchard.Road;:Ste. 2000
' Greenwood Village, CO- 80111 .
Phone: 303.7705600
,
' CLC Job'No..0"010•
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