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Mr. Basil Hamden
Stormwater Utility
City of Fort Collins
PO Box 580
Fort Collins, Colorado 80522
Dear Basil,
Attached is the cost estimate for erosion control measures associated with the
construction of a warehouse -office building in the 300 block of West Hickory Street.
Silt Fence - 65 If @ $2.50 /If
$162.50
Alternate; Seeding - 2.44 ac @ $1300/ac
$3168.75
Security required = $3168.75 x 1.5 =
$4753.10
City policy requires a minimum escrow of...
$4753.10
Basil, please feel free to call with any questions, comments or suggestions you may
have.
Very Truly Yours.
Joseph P. Marcisofsky, P.E.
Structured Engineering
The SDDC outlines the causes and results of soil erosion due to wind and
rain. Along with the requirements of this report and the erosion control plans,
the SDDC shall be considered in it's entirety for guidelines to aid in preventing
rainfall soil erosion. The SDDC will govern requirements and specifications for
earth moving at the construction site.
A cost estimate for erosion control measures is included with this report.
11 11 • • i 11 • ► ► • • • ► Releh, 19;191011 i
The following is a summary of the storm drainage improvements and erosion
control measures that are to be observed during construction.
1 . Keep disturbed areas to a reasonable minimum at any one time.
2. Stabilize all disturbed areas.
3. Keep runoff to velocities not causing erosion.
4. Provide diversion channels to direct runoff around and away from
disturbed areas.
5. Keep all cut and fill slopes stabilized with terracing or scarifying
furrows perpendicular to the slope.
6. Protect stockpiled materials from wind erosion. Stockpiles are not to
be higher than 8'.
7. Permanent ground cover is to be established on all disturbed areas.
Areas to be seeded which have been compacted by construction
activities are to be ripped or otherwise loosened prior to seeding.
8. Provide a temporary cover crop or an application of mulch to areas to
remain unseeded greater than one month. Disturbed areas which
have topsoil removed may require an application of fertilizer prior to
temporary seeding.
9. Inspect, clean and repair all erosion control measures the following
work day after each storm event.
10. Additional erosion control construction details and specifications shall
be taken from the City of Fort Collins Storm Drainage Design Criteria
and Construction Standards.
A. Design Criteria
The City of Fort Collins has prepared a Storm Drainage Design Criteria and
Construction Standards (SDDC) which provides the basis for the analysis used in
predicting storm runoff and the recommended drainage improvements.
B. Hydrology
The Rational Method is used to predict the amount of runoff. The 100-year
return frequency was used in this report to predict major peak discharges, and 10-
year storm is analyzed to predict minor flows.
C. Conformance With Existing Master Drainage Plans
The FIRM Flood Insurance Rate Map prepared by FEM ( Community Panel
Number 08012-004-C, revised March 18, 1996) was consulted to determine flood
plain boundaries in the area. The flood plains are. indicated on sheet 5 of the
utility drawings, and are also included in this report. In summary, the building site
is not affected, but a discharge swale to the Poudre River will naturally enter the
Poudre River flood plain.
a D. Proposed Drainage Facilities
Proposed drainage improvements consist primarily of street improvements to
Hickory Street and an open swale across the Salyer Open Space south to the
Poudre River. The Hickory Street improvements will result in a 4' curb inlet in a
sump condition, which will be connected to the existing ►54cMP
providedwhen the street was constructed on the north side. The Salyer open
swale has been discussed with Fort Collins' Natural Resource Department, and
they requested it be natural in appearance. As such it will meander along the
existing topography, and will vary in cross section. It will be revegetated with
natural grass seed provide by Natural Resources. the discharge end at the Josh
Ames Canal will have buried riprap protection. A 15" RCP under Fourth Street will
convey building site runoff to the Salyer swale.
The property has been described as " a parcel of land being a portion of
Block 15, the vacated alley therein, vacated Fourth Street and vacated Fourth
Avenue, in Riverside Park of the City of Fort Collins, and other property in the SE
1 /4 of Section 2, Township 7 North, Range 69 West of the 6th Principal Meridian,
in Larimer County, Colorado". The parcel is being re -platted as "Levon's Minor
Subdivision".
The area is undeveloped with no major physical features. There are about a
half dozen mature trees... large diameter poplars of some sort. The trees will not
be disturbed by this development. The remainder of the site is local, native
grasses.
A public concrete bike/pedestrian trail borders the site along the west side
(offsite), and the Union Pacific railroad tracks are along the east side. Hemlock
Street forms the south boundary, and Hickory Street is along the north.
The proposed building, (approximately 70' x 210'), will be off of Hickory Street,
20' from the west property line. Existing lot grading is at approximately .4%,
generally from the north to the south.
The north half of Hickory Street is paved with vertical curb and gutter. The
south half will be paved as part of this construction and will include vertical curb
and gutter and sidewalk. Fourth Street (also known as Hemlock) along the south
property line is gravel now and will remain so. No street access is going to be
provided to Fourth Street as part of these improvements.
The only existing drainage improvements immediately adjacent to the site is
the curb and gutter along h,north side of Hickory. There is a curb inlet across
the street, and a ",�P sus"-Qrsdl�Lbeen stubbed to the south side of
Hickory in anticipation of the improvements to the south side of the street. That
stub will be utilized to discharge street runoff collected by new curb and gutter
construction as part of this construction. A 4' curb inlet will be installed on the
south side of the street.
There are no pronounced natural drainage features on the site.
The soils group making up the site is primarily clay loam according to the
Larimer County Soils Survey by the Soil Conservation Service.
I
1,
FINAL STORM DRAINAGE
and
EROSION CONTROL REPORT
for
Levon's
Warehouse and Office Building
March 16, 1996
INTRODUCTION
A warehouse - office building is proposed for construction on a 3.43 acre
(gross, 2.91 net after street R.O.W. dedications), parcel zoned H-C, Highway
Commercial, in the 300 block of West Hickory Street: The parcel is just west of
the Union Pacific railroad tracks, south of Hickory Street and north of Hemlock
Street. Portions of the parcel will be deeded to the city for public rights -of -way
along Hickory and Hemlock. The site is currently undeveloped.
This report sums up the analysis that was undertaken to determine what, if
any, impacts the proposed construction will have on the historical drainage
patterns in each area.
The report will address the following:
1.Site Descriptions
2.Storm Drainage
A. Design Criteria
B. Hydrology
C. Conformance With Existing Master Drainage Plans
D. Proposed Drainage Facilities
3.Erosion Control
A. Erosion Control Measures
It is intended that the recommendations found in this report become an
integral part of the design and construction phases of the project.
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FINAL
STORM DRAINAGE
and
EROSION CONTROL REPORT
LEVON'S
WAREHOUSE AND OFFICE BUILDING
300 BLOCK OF WEST HICKORY STREET
CITY OF FORT COLLINS, CO
March 16, 1996
Prepared For:
Charles Meserlian
North College Avenue
Fort Collins, CO 80521
(970) 221-0700
Prepared By:
Structured Engineering
318 East Oak Street
Fort Collins, Colorado, 80524
Phone (970) 495-0810
Fax (970) 224-1314
March 16, 1996
Mr. Basil Hamden
Stormwater Utility
City of Fort Collins
PO Box 580
Fort Collins, Colorado 80522
Dear'Basil,
Attached is the Final Storm Drainage Report that accompanies the
construction of the proposed Levon Warehouse and Office building to be located in
the Poudre River drainage basin in the 300 block of West Hickory Street in north
Fort Collins.
All design is in conformance with the latest edition of the City of Fort
Collins' Storm Drainage•,Design Criteria and Construction Standards.
Ver TAEngineerin
Jos phStruct
FINAL
STORM DRAINAGE
and
EROSION CONTROL REPORT
LEVON'S
WAREHOUSE AND OFFICE BUILDING
300 BLOCK OF WEST HICKORY STREET
CITY OF FORT COLLINS, CO
March 16, 1996
Prepared For:
Charles Meserlian
North College Avenue
Fort Collins, CO 80521
(970) 221-0700
Prepared By:
Structured Engineering
318 East Oak Street
Fort Collins, Colorado, 80524
Phone (970) 495-0810
Fax (970) 224-1314