HomeMy WebLinkAboutSite Certifications - 06/10/1997STEWAIZF&ASSOCWES
Consulting Engineers and Surveyors
May 5, 1997
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
re: 4223-S_ Mason -Street
N
We have surveyed the elevations of the parking lot detention ponding area and found it to be
constructed substantially per the approved plan. The surveyed elevations are shown in red on the
attached print.
The area inlet and outlet pipe through a sidewalk culvert into the west gutter of South Mason
Street have been installed. The 2.8 inch diameter restricted opening has been installed over the
outlet pipe.
Ayres Associates did the construction surveying for this project, and when it come time to
certify the pond volume, they calculated that the volume of the pond on the approved plan was
only 2800 cubic feet instead ofthe necessary 4500 cubic feet. While I was discussing this with
Brian Nelson at Ayres, he discovered that his planimeter was giving him incorrect areas, and that
the true volume was much closer to the 4500 cubic feet.
I have attached a copy of the planned ponding area on which is shown my planimetered areas
and volume calculation. Also attached is a copy of the original calculation.
I believe this detention pond as constructed provides adequate volume.
Please call ifyou have questions.
Sincerely,
Phillip L 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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t E V VAR &ASS JCIA LS PH. 482-9331RFAX 482-9380LLINS, CO 80521
Consulting Engineers and Surveyors
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STEWA r&A SSOCIATE$ 103 S. ME DRUM, FO31 FAX a82 9382 COLLINS, CO 80521
Consulting Engineers and Surveyors
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09/91 NA GE SUMMARY
SITE IS LOCATED IN THE
M`CLELLAND5- MgIL CREEK
ALLOVABLE RELEASE RATE 15 O.5
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DER Ac. 0.3 L
AREA OF SITE = 6,59e
AC.
HISTORIC c+ 0.20
DEVELOPED C• 0.89
HISTORIC aL • 0.20 .,l•
DEVELOPED Q4 = 1.32 Ll.
HISTORIC a," 0.7z c+r
DHIELDPLD rl.m: 4.19 1G5
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LEGEND
42
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