HomeMy WebLinkAboutSite Certifications - 01/11/1995' Northern Engineering Services, Inc.
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January 11; 1995
Glen Schleuter
City of Fort Collins
Stormwater Utility
235 Mathews
Fort Collins; CO; 80522
RE-: Drainage Certification
Hampshire Pond P;U;D;
Project Number: 9317.07
Dear Glen:
We have completed our review of the as -built drainage and grading at the
above referenced project: This certification pertains to Phases' I and II
only; which includes Storm Sewer Line "A"; the detention pond and; on and off -
site Swales' B and A respectively:
A field inspection of the drainage and erosion control appurtenances was
conducted on Wednesday November 30; Wednesday December 14; 1994 and January
11; 1995; The following is synopsis of the observations made during the field
visits;
1) Temporary erosion control such as straw bale dikes and gravel
inlet filters are in place and appear to be functioning
efficiently;
2) Rip -rap at the outlet of Storm Sewer Line "A"; along Swale "A" and
at the outlet of the detention pond discharge pipe are all in
place;
5NO3) Swale "B"; adjacent Drake Road; is sodded and landscaped with a
capacity well exceeding the minimum required;
Q Swale "A"; located in the southeast corner of the site;
5koi Sure. also has capacity well exceeding the minimum required; The
concrete trickle pan is at a design grade of 0.-50%;
5) The 15" RCP in Swale "B" has a full flow capacity,of' 44 3 cfs;
The anticipated 100-year flow at the culvert is'2;23 cfs
`} therefore; the pipe has ample capacity:
The overall site grading is within reasonable tolerances;
R
7)lfJ- Street grades are very near design elevations and; therefore, -
street capacities are acceptable;
S�
420 S. Howes • Suite 202 • Fort Collins, Colorado 80521 • (303) 221-4158 • Fax (303) 221-4159
Hampshire Pond P.-U:D. January 11; 1994
Drainage Certification Page 2
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8) The detention pond has adequate volume to detain the anticipated
stormwater runoff calculated from the SWMM modeling.- An emergency
overflow swale and; overflow pipe fitting have been provided to
convey a pond spill towarA the south to S ring Cree .- 5�6� aew
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To the best of my knowledge- belief; and opinion; the drainage
facilities were constructed in accordance with the design intent of the c(6c&w tbe-'Ax
approved drainage report and construction drawings: If you require additionaleicua;f12a
information or analysis regarding this project please contact me at 221-4158:0 A-rke,
Sincerely;
NORTHERN ENGINEERING SERVICES; I
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Michael F: Jones; P:E: %O.c�•. e•c�`
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