HomeMy WebLinkAboutLot Certifications - 06/03/1997STEWART&ASSOCIATES
Consulting Engineers and Surveyors rro
JUN 1 pgn
June 3, 1997 I .. " `
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
re: 3930 Automation Way - Lot 2 of Collindale Business Park Second Filing
This lot was developed in 1994. The building was constructed and two thirds of the parking
area was paved.
The remainder of the parking lot is now to be paved. The new pavement area is about 4000
square feet, and the hardsurface of this new pavement was included in the developed runoff
coefficient calculations in the 1994 drainage report. Detention for this site is provided by the
existing ColUndale Business Park detention pond, which is located adjacent to the northerly .
boundary of this site.
A copy of the 1994 drainage report and of the approved plan is included.
The new pavement will maintain the original drainage patterns proposed for this site. The
runoff will be to the east into the existing drain swale with concrete trickle pan.
Erosion control for the grading of the proposed parking area may be provided by the
installation of 45 feet of silt fence along the east edge of the area to be graded. The erosion
control deposit will. be the minimum of 1000 dollars.'.
No further drainage study is necessary for this site.
Sincerely,
Phillip I. Robinson, P.E. & L.S.
rrc
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
970/482-9331
Fax 970/482-9382
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DRAINAGE SUMMARY TAL•SLE
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GROSS AREA OF SITE a 1.17 AG
NET AREA OF SITE a 1.03 /Oc
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DETENTION PROVIDED IN EXISTING
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GOLLIND/ILC OVS/NCSf PARK POND
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REQUIRED DETENTION FOR LOT 2• 0.2Il AC Pi
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PROVIDED pfiTEN710N FOR LOT Lr O.Z7 AG FT
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POND - PER STEWART G A530c1ATES
REPORT POR COL LINDALE OYSIN ESS
PARK PREPARED IN l7Ef.
EROSION CONTROL:
CONTRACTOR SHALL PROVIDE WOOR AND
EQUIPMENT TO CLHAN GFP AWD AND DEERIS
TRACKHD ONTO PAVEMENT
ZZO! OP. SILT PENCE TO DE /NSTfILLQO
^LOI NORTH EOUND.ARV OF 317E
STR.oW PALE SEDIMENT BFIRRIERS
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.;Final Appr ed'%p
Date 3/23/Y-r
Y STORM DRAINAGE AND EROSION CONTROL REPORT
FOR
LOT 2 OF COLLINDALE BUSINESS PARK, SECOND FILING
PREPARED FOR
R.C. HEATH CONSTRUCTION, INC.
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331
319/9¢
STORM DRAINAGE AND EROSION CONTROL REPORT
LOT 2 OF COLLINDALE BUSINESS PARK, SECOND FILING
SITE LOCATION AND EXISTING CONDITIONS:
Lot 2 of Collindale Business Park, Second Filing, has a net area of 1.03
acres and a gross area of 1.17 acres, including one—half of adjoining Automation
Way. The site is located on the east side of Automation Way and is approx—
imately 200 feet north of Lowe Street. The site is located in the Fox Meadows
Drainage Basin. The site is a part of the area included in the approved
Drainage Report for Collindale Business Park prepared by Stewart and Associates
in 1979. There is an existing detention pond which was constructed in 1979.
This pond detains the difference between the 2—year historic runoff and the
100—year developed runoff for 34.4 acres of the Collindale Business Park site.
The release from this pond is through an existing 24—inch pipe which flows
east under Timberline Road and then on easterly through the Sunstone Swale.
The required volume for this pond is 7.19 acre feet, and the available volume
of the as —constructed pond is 7.89 acre feet.
Lot 2 of Collindale Business Park, Second Filing, is located adjacent
to the south edge of this existing detention pond, and runoff from Lot 2 will
flow directly into the pond, per the 1979 report. The east half of Automation
Way located along the westerly boundary of Lot 2 is existing construction which
flows north approximately 300 feet to curb/inlets which drain into the existing
detention pond. `
The detention required for Lot 2 based on 7.19 acre feet required for
34.4 acres equals 0.209 acre feet per acre; therefore, the Lot 2 detention
requirement is (0.209) x (1.17) = 0.24 acre feet.. The provided detention is
7.89 acre feet for 34.4 acres equals 0.229 acre feet per acre. The detention
provided in the pond is (0.229) x (1.17) = 0.27 acre feet.
A copy of the overall Collindale Business Park plan, which was prepared
for the 1989 report, is included with this report. The storm drainage
procedures proposed for Lot 2 in this report comply with the 1989 report.
The existing site is covered with vegetation and drains from southwest
to northeast and into the existing detention pond. All public streets and
utilities adjoining the site are existing. Runoff from Automation Way, which
joins Lot 2 on the west, will not enter the site, and also runoff from the
site will not flow to Automation Way. There is offsite drainage across Lot
2 from Lot 3, which joins Lot 2 on the south.
DEVELOPED SITE:
The site will be developed with a building, paved parking, and landscaped
areas. The developed net site area of 44684 square feet will be 28640 square
feet impervious and 16044 square feet landscaped, including 4240 square feet
of probable future paved parking. The developed C will be 0.73, which is less
than the developed C of 0.85 assumed in the 1989 Collindale Business Park
Drainage Report. This developed C is based on the gross area of 1.17 acres
which.includes one=half of Automation Way.
Lot 2 of Collindale Business Park, Second Filing
Page 2
The developed site is divided into three sub —basins which are the east
one—half of Automation Way, the west 100 feet of the site, and the east 120
feet of the site. The east one—half of Automation Way drains north to inlets
into the detention pond. The west 100 feet of the site is the front parking
lot, and it will drain northerly into the existing detention pond. The east
120 feet of the site, which is the building and future parking area, will drain
east into a drain swale which runs north along the east 20 feet of the site.
This drain Swale will empty into the detention pond. There is also offsite
flow from Lot 3 of Collindale Business Park which must be carried across Lot
2 in this drain swale. We have sized the Swale to carry the total developed
100—year runoff from Lot 3 in addition to the 100—year developed runoff from
the east 120 feet of Lot 2.
EROSION CONTROL:
As construction begins on Lot 2, most of the site will be stripped and
the building pad and parking lot grading will take place. Immediately following
the grading, the concrete foundations, building slab and curbs will be
installed. The small size of the site and the construction activities do not
allow revegetation during the construction period, so sediment control measures
to keep sediments from leaving the site shall be implemented. A silt fence
and straw bale channel barriers shall be installed during the construction
period, to remain until erosion is controlled by paving and landscape
vegetation.
The site is in a moderate wind erodibility zone, and the construction
of curbs and foundations and the installation of rainfall erosion protection
measures will provide the 200—foot barrier spacing required to prevent wind
erosion.
All storm drainage design and erosion control methods comply with City
of Fort Collins Storm Drainage Design and Construction Standards.
Phillip I. Robinson, P.E. & L.S.
enclosures
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STEWART&kSSOCIATES
Consulting Engineers and Surveyors
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PH. 482-9331 FAX 482-9382
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PERFORMANCE STANDARD EVALUATION
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PROJECT:
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DEVELOPED
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DI/SF-A:1939
EFFECTIVENESS CALCULATIONS .
----------------------
C----
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PROJECT: Loahesi�aric STANUARU FUP1 B
C0tPLETED BYDATE: p3
Erosion Control
C-Factor
P-Factor
Method
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Value
Value Comment
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SUB AREA
BASIN (Ac) CALCULATIONS
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' CONSTRUCTION SEQUENCE
PROJECT: • Lo7 Z Collindale UUSiness Park STANDARD FORM C
SEQUENCE. FOR 19 Y¢- ONLY.:• COMPLETED BY: DATE: IZ Z Z 3
Indicate by use of mbar line or s_mbols when erosion control measures will be installed.
Major modificationsto an approved schedule may require submitting a new schedule for
approval by the City Engineer.
YEAR i994
MONTH.'I J F
OVERLOT GRADING _
WIND EROSION CONTROL I
Soil Roughing
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other con c ;' 17v,,
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
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
--------------------------------------
STRUCTURES: INSTALLED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HOI/SF-C:1989
�_�".^._
MAINIAINEU BY
APPROVED BY CITY OF FORT COLLINS ON
STEWART&&SSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: P—JK — Date: Client: FT- C. 9&a,4' Sheet No. of
Project:
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