HomeMy WebLinkAboutDrainage Reports - 05/16/2016City pf l�t. C'dl p tied Plans'
APPBy" t
North Star
design
700 Automation Drive, Unit I
Windsor, CO 80550
Phone: 970-686-6939
Fax:970-686-1188
March 31, 2016
Wes Lemarque
City of Fort Collins Utilities
700 Wood Street
Fort Collins, Colorado 80525
RE: Serious Texas Barbeque
Timberline Center, Lot 1
Mr. Lemarque,
This letter is to serve as an addendum to the drainage report prepared by North Star
Design for the Timberline Center located west of Timberline Road in Fort Collins. This
addendum applies to the proposed development location on Lot 1 which is intended to be
a Serious Texas Barbeque restaurant. The Lot is located in Sub -basins 18, 19 and 20
which are described below.
Sub -basin 18 contains the southwest comer of the Lot and will drain west into the shared
entrance (with Big O Tires) into the private drive and then south to a sump inlet.
Sub -basin 19 contains the northwest portion of the Lot and that will drain west into the
private drive and then north to an existing curb cut and into the detention pond via a
metal sidewalk culvert.
Sub -basin 20 contains the east half of the lot and the detention pond located east of Lot
1. This has been designed to detain Basins 17 through 20 and release directly to the storm
system in Timberline.
In general, the site conforms to these basin delineations with small. deviations. Basin 20
area is smaller by 2060 square feet, Basin 18 is smaller by 390 square feet and Basin 19
,� c
is larger by 2450 square feet. This causes the 100 year flow in Basin 20 to decrease from
7.6 cfs, (from the Big O Tire update) to 7.1 cfs, in Basin 18 to decrease from 6.0 cfs
(from the Big O Tire update) to 5.9 cfs (equal to the original flow in Basin 18) and in
Basin 19 to increase from 1.1 cfs to 1.6 cfs. The increased flow from Basin 19 will be
conveyed in a 2' curb opening and sidewalk culvert directly into the existing detention
pond. This additional flow will not impact any other site and is offset by the decreased
flow in Basin 20. Therefore there is no discernable impact to the detention pond and the
calculations for the pond were not updated.
This site is required to conform to the current LID standards for the City of Fort Collins.
This requires that 25% of the proposed pavement be interlocking permeable pavers and
that 50% of the site impervious be routed through an LID filtering device. Based on this
criteria, this site is required to provide 2455 sf of pavers and have 7302 sf of
imperviousness pass through an LID filter. As proposed, the site provides 2448 sf of
pavers and routes approximately 7026 sf through an LID filter. See summary table
included at the end of this letter update.
The building does extend further north than originally planned for in the overall
development which will require the owner to vacate a portion of the drainage easement
for the detention pond. The 100 year high water elevation for this pond is 4940.30 which
is achieved in the remaining drainage easement. The deck located on the east side of the
building will be open underneath and the detention pond will be able to exist under the
deck space. Therefore this deck will not impact the existing detention volume.
The building floor elevation is set at 4943.5 which provides sufficient freeboard for the
pond. The finished grade along the east side of the building (detention pond side) will be
set at elevations which match the existing grade on site in order to not encroach on the
existing volume of the pond. The imperviousness dictated in the Timberline Center
drainage report will be met with this development and no additional on -site detention or
runoff calculations will be required.
Please contact me if you have questions or need additional information.
Sincerely,
Patricia Kroetc
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LID St."AARY TABLE
TOTAL NEW IMPERVIODS AREA
14.603 SF
IMPERVIOUS AREA REDID TO BE TREATED (509)
7301 SF
IMPERVDUS AREA PROPOSED TO BE TREATED
7026 SF
TOTAL NEW PAVEMENT AREA
9622 SF
PAVEMENT AREA REO'0 TO BE PAVERS (259)
2455 SF
PAVERS AREA PROPOSED ON SITE
2448 SF
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City of Fort Collins, Colorado
UTILITY PLAN APPROVAL
APPROVED:
SHEET
MIT EIRII mH
I
CHECKED BY:
'
1
CALL UTIIJTY NOTIFICATION
Wotr A Waalmtc Mlilr
CHECKED BY:
Data
CENTER CF COLORADO
1-800.922.1987 (811)
S,,:Ir. . VI2It,
CHECKED BY:
D=M
CALL 2-R,ISNF55 DAYS INADVANCE
' 9EFORE TOU DIG, DUDE. OR EXCAVATE
FOR THE MARKING M UNDMORMIND
MEMBER Un.IMS.
Pvkf A Recmisn
CHECKED BY:
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North Star Design, Inc.
700 Automation Drive. Unit I
Windsor, CO80550 RUNOFF COEFFICIENTS & % IMPERVIOUS
LOCATION: Timberline Center - Revised for Serious Texas BBQ, Lot 1
PROJECT NO: 114-37
COMPUTATIONS BY: PPK
DATE: 4/8/2015
Recommended Runoff Coefficients from Table 3-3 of City of Fort Collins Design Criteria
Recommended % Impervious from Urban Storm Drainage Criteria Manual
Streets, parking lots (asphalt)
Sidewalks (concrete)
Roofs
Lawns (flat <2%, heavy soil)
Runoff
%
coefficient
Impervious
C
0.95
100
0.95
96
0.95
90
0.20
0
SUBBASIN
DESIGNATION
TOTAL
AREA
(aa)
TOTAL
AREA
(sq.ft)
ROOF
AREA
(sq.ft)
PAVED
AREA
(sq.ft)
SIDEWALK
AREA
(sq.ft)
LANDSCAPE
AREA
(sq.ft)
RUNOFF
COEFF.
(C)
%
Impervious
REMARKS
18
0.61
26,420
4,590
15292
525
6,013
0.78
75
19
0.16
7,120
0
5,685
590
a45
0.86
88
20
1.11
48,190
14.054
4,880
1,540
27,716
0.52
39
Equations
Calculated C coefficients &-% Impervious are area weighted
C=E(Ci Ai) /At
Ci = runoff coefficient for specific area, Ai
Ai = areas of surface with runoff coefficient of Ci
In = number of different surfaces to consider
At = total area over which C is applicable; the sum of all Ai's
Final Flowids Cval
North Star Design, Inc.
700 Automation Drive, Unit I
RATIONAL METHOD PEAK RUNOFF (NEW IDF CURVE)
Windsor, CO 80550
(10-YEAR)
LOCATION:
Timberline Center - Revised for Serious Texas BBQ, Lot I
PROJECT NO:
114-37
COMPUTATIONS BY:
PPK
DATE:
4/82015
10-yr storm, Cf =
1.00
DIRECT RUNOFF
CARRYOVER
TOTAL
REMARKS
Design
Pant
Tributary
Sub -basin
A
(ac)
CCf
tc
(min)
i
(new)
(in/hr)
Q(10)
(cfs) ,
from
Design
Pant
0(10)
I Ids)
O(10)tot
(cfs)
18
18
0.61
0.78
5.0
4.87
2.3
2.3
Original flow=2.3ofs
19
19
0.16
0.86
5.6
4.25
0.6
0.6
Original flow=0.4 cfs
20
20
1.11
0.52
5.0
4.87
2.8
2.8
Original flow=3.lcfs
Q=CfCiA
Q = peak discharge (cfs)
C = runoff coefficient
Cf = frequency adjustment factor
I = rainfall intensity (in/hr) from IDF curve
A = drainage area (acres)
NOTE: Intensity based on Figure 3-1, 1999 (Regional Analysis)
Final Flow.-ds 010
North Star Design, Inc.
700 Automation Dave, Unit I RATIONAL METHOD PEAK RUNOFF NEW IDF CURVE
Windsor, co 6osso � ( )
(100-YEAR)
LOCATION: Timberline Center - Revised for Serious Texas BBQ, Lot I
PROJECT NO: 114-37
COMPUTATIONS BY: PPK
DATE: 4/8/2015 -
100-yr storm, C/ = 1.25 0.234
DIRECT RUNOFF
CARRY OVER
TOTAL
REMARKS
Des.
Point
Area
Design.
A
(ac)
C Cf
tc
(min)
i
(new)
(in/hr)
Q (100)
(cfs)
from
Design
Paint
Q (too)
(cfs)
0(100)tot
(ds)
18
18
0.61
0.97
5.0
9.95
5.9
5.9
Original Flow=5.9cfs
19
19
0.16
1.00
5.0
9.95
1.6
1.6
Original flow=l.lds
20
20
1.11
0.65
5.0
9.95
7.1
7.1
Original Flow=7.9d5
1 1
Q=CiA
Q = peak discharge (cfs)
C = runoff coefficient
I = rainfall intensity (in/hr) from IDF curve
A = drainage area (acres)
NOTE: Intensity based on Figure 3-1, 1999 (Regional Analysis)
Final FlowAs Q100
e
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, existing development to
the north and existing public and private streets to the east and west. A detention
pond exists on the north and east sides of the lot. 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 channel to capture sediments that are
not fully contained by the silt fence placement.
The site will also utilize a vehicle tracking control pad 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:
I Mentificntion and location of all notential nolhrtion sources
£r *y :r r'
Potential Pollutant Source�Actrvity+"��t,
z nxr�,x t vxVa r
..A±v1i!.�'t F 3`S.i`.°�4 N.h^Y'3. !(l.� `...:t ;Y'1l S.M"": ....J+'
Potenria] PollutantGenerated
wF1y��
t.l�+y. '..'}IS^} y. .i. : i+.,.�Ft.. �.4. ..
Applicable fo a
^
I Atlnspro�ects t!
Y1`t"tg;..3 w .0
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 BIViP's are expected to change
as the construction progresses and it is the responsibility of the contractor to ensure
appropriate BNIP'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 BMW's shall be installed per the details shown on the construction plan set.
Temporary & Permanent Structural BMP's:
y t s fi ya,
Structural BMP 3 r
,W m ry, �
v Approximate location on t
Apphcabletoth�r ..
Pro ect
jf._YIJ,:
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
Inlet/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
the site enables .tracking of silt onto the adjacent streets during wet conditions. During
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.
Temporary & Permanent non-structural BMP's:
�,
Non Structural BNT _
Approximate location on site+ , s
�.. K K.
�n
Y
�
��
[• _.-:T• n
iY � t YF�. ).-�.-S M1'a5 yf�' 3-I..FX���
�.}rn w�.t. :m V. e3e
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.-- ----------------- -- ---- - —
21 Materials Hnndlina and Cnill PrevPntion-
IGlatenals Handling & Spill�r z#
' �k-'� ti afa {"¢'Applicable
to this
k bu
ErevenhonBMPq«
w Approximate locatron on site r
rk P
MFx, zt. sark
e`: .s:"a .4 1 i
y €Protect `i..; t
Portable toilets, anchored &
located away from drainages
Contractor to determine
X
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
or smaller containers, kept in
. Contractor to determine
X
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 fuel 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,
6) 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
LID Summary Table
- -- — - - - ----- -- - Serious Texas Barbeque--- -- ... - -- — -
New Impervious Area .
Required Minimum Impervious Area to be Treated
Impervious Area Treated by Permeable Pavers
Total Impervious Area Treated
10/1/2015
14603 sq. ft.
7301.5 sq. ft.
7026 sq. ft.
7026 sq. ft.
New Pavement Area
9822 sq. ft.
Required Minimum Area of Porous Pavement
2455.5 sq. ft.
Area of Paver Section #1 I
1355 sq. ft.
Run-on area for Paver Section #1(up to 3:1 is permited)
3575 sq. ft.
Area of Paver Section #2 ;
1093 sq. ft.
Run-on area for Paver Section #2 (up to 3:1 is permited)
3451 sq. ft.
Total Porous Pavement Area
2448 sq. ft.
Erosion and Sediment Control Escrow/Security Calculation
for -The -City -of Fort Collins
Project: Serious Texas Barbeque, Lot 1 Timberline Center
Disturbed Acres: 0.55
`�..,
�_.-'`a s._BMP�Amount h
<-:. �.- .__ �.._,�,c+xa.a.:.�.rl.<��'`.k..u..v
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Estimated
Unit
Total
EROSION CONTROL BMPs
Units Quantity
Price
Price
Silt Fence
L.F. 585
$3.00
$1,755.00
Rock Sock
each 12
$85.00
$1,020.00
Rock Berm
each 1
$230.00
$230.00
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 3
$90.00
$270.00
(add all other BMPs for the site in this list)
Sub -Total: $5,975.00
1.5 x Sub -Total: $8,962.50
Amount of security. $8,962.50
Total Acres x Price/acre: $660.00
Unit Price of Seeding per acre: $1,200.00 Sub -Total: $660.00
1.5 x Sub -Total: $990.00
Amount to Re -seed: $990.00
a 3- f Mmwmum Escrow Amounts 3
Minimum escrow amount: $3,000.00
- "Final Escrow Amount: ' a ' v'
Erosion Control Escrow: $8,962.50
"The 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
Ilse cost to re -vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilizadon Bid,
whichever is greater. In no instance, will the amount of security be less than one thousand five hundred dollars (SI,500) for residential development or three
thousand dollars ($3,000) for commercial development"
7/15/2015 4:07 PM uaaa-oe Be,ious Texas BBowmimgmEc Ew .xh
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CONSTRUCTION SEQUENCE
PROJECT: SERIOUS, TEXAS BBO DATE: 10/l/15
CONSTRUCTION -
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GRADING (INCLUDES OVERLOT)
DETENTION / WO PONDS
PIPELINE INSTALLATION (INCLUDES OFFSITE)
SAINITARY SEWER
STORM SEWER
CONCRETE INSTALLATION (INCLUDES
SIIEWALK CULVERTS & CHASES
CURB AND GUTTER
FINE GRADING BASE COURSE INSTALL
BEST MANAGEMENT PRACTICES
STRUCTURAL
SILT FENCE 8ARsx+[-Px�y--
CONTOUR FURROWS
VEHICLEPADS
.:.SEDIMEN
CONCRETE
INLET PROTECTION
TEMPORARY SEED PLANTING
MUL
..PER