HomeMy WebLinkAboutSite Certifications - 10/26/2005AIRES
ASSOCIATES
October 21, 2005
Mr. Jay Barber
City of Fort Collins
Stormwater Utility
700 Wood Street ,.
Fort Collins, Colorado 80521
Re: Drainage Certification for -Cortina Mixed -Use Building
Dear Jay,
RECID OCT 2 4 2�d5
STATER
RECEIVED
OCT 2 4 2005
We recently surveyed the building and overlot grading improvements for the new mixed -use building
located on the southwest corner of the intersection of Canyon Avenue and South Howes Street in
downtown Fort Collins. Spot elevations and drainage patterns were checked at pertinent locations to
verify whether the grading met the intent of the approved grading and drainage plan. The enclosed
drawings show the design and as -built elevations.
In general, the lot and building meet the requirements of the grading and drainage plan and there is
positive drainage away from the building on all sides. The finished floor elevation is at elevation 5000.70,
which matches the design finish floor elevation. Approximately 42 spot elevations were surveyed on the
ground adjacent to the building. The east side of the building drains directly east to Howes Street. The
south side of the building drains east along the center of a concrete -paved access road out to Howes
Street. The northwest side of the building drains toward Canyon Avenue. Along the northwest side of the
building there is an access drive into the underground parking garage. At the high point of the ramp an
18" floodgate can be swung into place to prevent water from entering the building. Also, curved vane
inlets span the length of the ramp at the entrance in the garage. Currently half of the inlet grates are
oriented backwards (see attached photos). The southeast corner of the lot, near the mechanical building,
is paved with concrete and water drains to a new storm inlet.
That storm inlet was initially designed to be on the southeast side of the access drive. It was moved to
the northwest side and as a result the stormwater design was slightly altered. The manhole connecting
the inlet to the main line was moved further down the line as well. Correspondingly, the pipe lengths at
the upstream end of line Storm 1 have changed. The design slopes were 0.5% at a minimum. The as -
built pipe slopes are somewhat flatter, with a minimum slope of 0.36%.
A positive slope is maintained at all locations on the building site. It is my recommendation that the
Certificate of Occupancy for this property be released since the Contractor graded the lot to meet design
drainage patterns. If you have any questions, please call.
Sincerely,
Ayres Associates Inc
Christop L. Doherty, E.
Project anager— Water Resources
CLD:sp
Enclosure
Owen Ayres & Associates, Inc.
Engineers /Scientists/Surveyors
3665 JFK Parkway, Building 2, Suite 200, P.O. Box 270460, Fort Collins, CO 80527
(970) 223-5556, Denver Metro (303) 572-1806, FAX (970) 223-5578
BARB10L1.DOC
32-0847.00
Printed on recycled paper
�
nging 18-inch Flood Gate
Flood Gate at Entrance to Underground Parking Garage
Tilt -bar Grate Inlets at Underground Parking Garage
BARB10L1.DOC
32-0847.00
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NOTES
EXISWI
1. ALL SANITARY SEVER SERVICES SHALL BE 6- PVC (SORT35) O 2S
uAm1nC TE
UNLESS NOTED OTHEI MSE.
2. ALL WATER MAINS SHALL BE DUCTILE PON PIPE (CUSS 52).
POLY -WRAPPED AS SPECIFIED BY CITY OF EMT COLLINS STANDARDS.
W/ M
3. ALL WATER SERNCES SHALL BE TYPE K COPPER, SIZE AS NOTED.
4. LIMITS OF STREET CUT ARE APPROXIMATE. FINAL LIMITS OF STREET
REPAIR TO BE DETERMINED W THE FIELD BY THE GTY ENGINEERING
WfCT
INSPECTOR, ALL REPAIRS TO BE IN ACCORDANCE MTH CITY STREET REPAIR
TO
rs"IN
STANDARDS.
TPARS
M CITY
5. WATERLINE TO MAINTAIN 4.5' MAIMUM AND 5.5' MAXIMUM BURY DEPTH
'
TO TOP OF MAIN FROM FINISHED GROUND,
6. FIRE UNE SHALL BE 6' DUCTILE IRON RESTRAINED JOINT PIPE AND
P(ANYMtAPPED. N.I. JOINTS SHALL BE MECHANICAL JOINT (NJ) MTH
MEGA -LUGS.
2 SEE FINAL PLAT AND HORIZONTAL CONTROL PLAN FOR SITE LAYOUT
INFORMATION
RENAIN AND
9. FIRE LINE AND COMMERCIAL WATER LINE SHALL EXTEND INTO A
MECHANICAL ROOM WHERE BACKIFLOW PREWNTON DENCES SHALL SE
INSTALLED. MECHANICAL ROOM SHALL HAVE A FLOOR MAIN LOCATED
ADJACENT TO THE BACKROW DEVICES AND SHALL BE SIZED TO ACCEPT
- - -
DISCHARGE FROM BACKROW DENCES.
LEGEND
-- PROPOSED WATER UNE
WM w PROPOSED GALE VALVE
A PROPOSED FIRE HYDRANT
PROPOSED SANITARY SEWER MM
MANHOLE AND ROW DIRECTION
PROPOSED WTIi STORM MANHOLE
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