HomeMy WebLinkAboutSite Certifications - 08/04/2006July 31, 2006
Project No. 1785-01-00
City of Fort Collins Stormwater Utility
P.O. BOX 580
Ft. Collins, Colorado 80524
Attn: Mr. Jay Barber
STORMWATER
RECEIVED
AUG 0 12006 CZHEA
Re: First Free Will Baptist Church (320 W. Trilby Road); Fort Collins, Colorado
Certification of Drainage Facilities
Dear Jay,
This letter serves as the final certification of drainage facilities for First Free Will Baptist Church
according to the requirements of the development agreement for First Free Will Baptist Church
and Larimer County Urban Area Street Standards (LCUASS) General Note 17 noted on Sheet 2
of the approved Final Utility Plans for First Free Will Baptist Church which states:
17. Prior to final inspection and acceptance by the City of Fort Collins, certification of the
drainage facilities, by a registered engineer, must be submitted to and approved by the
Stormwater Utility Department. Certification shall be submitted to the Stormwater Utility
Department at least two weeks prior to the release of a certificate of occupancy for single
family units. For commercial properties, certification shall be submitted to the Stormwater
Utility Department at least two weeks prior to the release of any building permits in excess
of those allowed prior to certification per the Development Agreement.
Shear Engineering Corporation has been involved throughout construction, has been involved in
field design modifications, has coordinated as-builts and has documented all construction
modifications. Based on our involvement during construction and review of the as -built field
data provided by Frederick Land Surveying, Shear Engineering Corporation states that First Free
Will Baptist Church sitework improvements have been completed in general conformance with
the Final Utility Plans for First Free Will Baptist Church prepared by Shear Engineering
Corporation; S.E.C. Project Number 1785-01-00; City of Fort Collins City Engineer approval
date June 19, 2003. Finished grading has been completed in accordance with the approved
MASTER GRADING PLAN PHASE 1 and with documented grading design revisions. All
drainage facilities have been installed in general conformance with the approved Final Utility
Plans and are functioning appropriately and generally meet the intent of the original drainage
design for First Free Will Baptist Church in accordance with the approved Final Drainage and
Erosion Control Report prepared by Shear Engineering Corporation; S.E.C. Project Number
1785-01-00.
Documented finished elevations have been provided by Frederick Land Surveying and are
represented on the attached mylar that can be used as an overlay on the original plan for
immediate comparison -to design grades. A print is also attached for your files.
4836 S. College, Suite 12 Ft. Collins, CO 80525 (970) 226-5334 Fax (970) 282-0311
www.shearenginecring.com
PAGE 2
July 31, 2006
Project No. 1785-01-00
Re: First Free Will Baptist Church (320 W. Trilby Road); Fort Collins, Colorado
Certification of Drainage Facilities
Detention pond design volume requirements presented in the Final Drainage and Erosion Control
Report for First Free Will Baptist Church were achieved. The Final Drainage and Erosion
Control Report identified that the required volume for the 100-year storm (with a release rate
per acre of 1.44 cfs) was 42,053 cubic feet (0.96 ac-ft) at an elevation of 5054.36 feet.
Based on the survey data provided by Frederick Land Surveying, and generation of a new stage —
storage curve for the actual finished detention pond grades, the required pond volume of
42,053 cubic feet (0.96 ac-ft) was achieved at elevation 5054.09 feet. A freeboard height of
1.41' is achieved. A copy of the stage -storage data for the existing pond is attached for
immediate reference.
The volume provided meets the design requirements for First Free Will Baptist Church
according to the Final Drainage and Erosion Control Report for First Free Will Baptist Church
which was prepared by Shear Engineering Corporation; Shear Project No. 1785-01-00.
Digital pictures of the finished site are also attached for immediate reference.
If you have questions concerning this final drainage certification for First Free Will Baptist
Church, please call at (970) 226-5334.
Shear Engineering Corporation
BWS / brb
attachments
cc: Roger Raper; First Free Will Baptist Church
Bryan Short; Frederick Land Surveying
Project No.: 1785-01-00 Shear Engineering Corporation 08/01/2006
Designer: BRB First Free Will Baptist Church 05:32 AM
Average End Area Method for determining Pond Volumes
100-yr Water Surface Elevation
Pond Developed Detention Pond
Criteria Store difference between developed and historic minor storms
Larger storms to be stored until released by emergency overfl
Invert 5051.97 ft First Even Contour 5052.00 ft
Increment 1.00 ft Top Elevation 5055.50 ft
Pond Developed Detentiol Volume
Stage Elevation Area (VI)
ft ft sf cf
Cumulative Volume
cf ac-ft
Req'd
Volume
cf
0.00
5051.97
0
0
0
0.00
42053
0.03
5052.00
8278
124
1 124
0.00
1 42053
1.03
5053.00
26812
7870
11231
0.26
42053
2.03
5054.00
31466
14517
39103
0.90
42053
3.03
5055.00
35195
33330
72433
1.66
42053
3.53
5055.50
1 37016
1 18053
90485
2.08
42053
100-yr Required Volume 42053 cf
Required WSEL 5054.09 ft
Freeboard 1.41 ft
Detention Pond certification (First Free Will Baptist) Brian
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