HomeMy WebLinkAboutSite Certifications - 06/11/2004I
A #
June 10, 200.4
NORTHERN
ENGINEERING
SERVICES, INC.
Jay Barber
Fort Collins Stormwater Utility
700 Wood St.
Ft.Collins, CO 80522
RE: Harmony Safeway Marketplace, Lot 8
Drainage Certification
Project Number: 04-055.00 CER
Dear Jay:
STORMWATER
JUN 10 2004
This drainage certification letter is to verify general compliance with the approved utility plans for "Harmony
Safeway Marketplace, Lot 8", located at 1414 E. Harmony Road. Survey data was provided to Northern
Engineering in May of 2004 by Enginineering Service -Co: Personal site inspection was conducted on June 9, 2004.
Please find enclosed a drainage certification exhibit showing surveyed as -built elevations along with design
elevation in the background.
The design top of foundation elevation (which is equal to the finished floor elevation since the building foundation is
slab on grade) was 4982.88. The surveyed as -built finished floor elevation is 4982.87.
The surveyed as -built gutter and pan flowline elevations are within a reasonable tolerance in comparison to the
approved plan. As -built drainage patters are in accordance with the approved plan. The curb cut at the southwest
comer of the parking lot, as well as the curb cut in the center median of the parking lot have been constructed within
reasonable tolerance of the approved plan.
The area inlet located at the western end of the parking lot has been constructed with a larger area than that of the
design. The design showed a rectangular inlet box with two 29"x36" grates (total area=14.5 sq.ft.), the box has
been constructed as a square with four 25"x25" grates (total area=17.4 sq.ft.), thus the inlet perform satisfactorily.
The design flowline elevation of the area inlet was 4978.74. The surveyed as -built flowline elevation of the inlet is
4978.63. No detention was required according to the approved final drainage report for the site.
There are minor inconsistencies throughout the site; however, the performance of the drainage design, in my
opinion, will not be hindered. To the best of my knowledge the major drainage improvements for Harmony Safeway
Marketplace, Lot 8 are constructed in substantial compliance with the design intent of the approved construction
drawings. If you require additional information or analysis regarding this project please contact me at 221-4158
ext.106.
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