HomeMy WebLinkAboutGARTH COMMERCIAL PLAZA - PDP - 20-02B - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT14 II
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' January 23, 2003
STEWART$,LSSOCIATES
Consulting Engineers and Surveyors
Mr. Basil Hamdan
Stormwater Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
The owner George Holter is now proposing to build Phase II of Lots 1 through 4, Garth
Commercial Plaza. The original storm drainage design and report are dated October 14, 1996
and approved by you dated December 6, 1996. That report and plans are included herein. Phase
I of this project has been constructed and "AS-BUILTS" submitted to your office in 1997.
Phase II's new building, parking lot and driveway layout are very similar to the original
layout. Both access drives, one on the North side next to the existing hotel and the one on the
South side next to the existing commercial building were constructed with previous phases.
This new plan will not change the approved flow directions or the subbasin areas as
shown on the original report. Subbasins 5, 6 and Offsite 1 are the original design basins for
Phase II. We have recalculated these basins to use the City's new Intensity data. This changed
the required detention volume of both Ponds 5 and 6. Additional storm drain pipe and area inlets
were added to obtain the increased volume required. Both ponds 5 and 6 will have a 100-year
depth of 1.2 feet. Both depths are lower than the original design, which were granted a variance
by you. We are again requesting a variance from the City's maximum depth of 12 inches. We
are also requesting a variance from the City's extended detention requirement. This site does not
have any place or area for that requirement. This is an infill project that was previously
approved as layout. An additional pipe and area inlet will be installed to the property to the
South at the owner's request. A LTD sewer model was run to show all new pipes and inlets.
Erosion control will be to install silt fences along Mason Street, and on both the North
and South sides along the existing driveways. Straw bale dikes will be installed around all four
area inlets until paving. The foundation will be installed prior to overlot grading for erosion
control.
The City's required escrow for erosion control is $3750.00.
If you have any questions or need any more information regarding the Phase II project
please let me know.
' Sincerely,
t
Franklin DljlK*, P.E. &
FDB/meh 9T "
INFER bA
James H. Stewart and Associates, Inc.
GARn,C.,WPIMb���103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
970/482-9331 • Fax 970/482-9382
ADDENDUM TO THE
FINAL DRAINAGE AND EROSION CONTROL REPORT
FOR
LOTS 1 THROUGH 4, GARTH COMMERCIAL PLAZA
LOCATED IN THE
McCLELLANDS MAIL CREEK DRAINAGE BASIN
PREPARED FOR
GEORGE HOLTER
JANUARY 20, 2003
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
PO BOX 429
FORT COLLINS, CO 80522
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