HomeMy WebLinkAbout20120339.tiff RECEIVED
1861 MEMORANDUM JAN 1 glint,
Weld County Vianning Department
TO: Kim Ogle, Planning Services GREELEY OFFICE
�/O J DATE: January 16, 2012
_COUNTY
FROM: Clay Kimmi, P.E., CFM, Public Works
SUBJECT: USR-1787, Dietzler Water Resources Corporation Final
Drainage Report Comments
Comments made during this stage of the review process will not be all inclusive; as revised materials are
submitted other concerns or issues may arise. All issues of concern and critical issues during further review
must be resolved with the Public Works Department.
COMMENTS:
The final drainage report was submitted for review on January 6, 2011. The report was stamped, signed and
dated by Frank Buturia, P.E. # 31475.
The drainage report could not be fully reviewed due to miscalculations in the historic release rate. Proper
calculation of the historic release rate is the basis for all subsequent calculations made for sizing the detention
pond. The historic release rate calculated in the drainage report was based on the 80 acre parcel boundary
not the 9 acre project site. The detention pond size was calculated using the historic runoff rate for the 80 acre
site and a 9 acre runoff area. In order to properly calculate the historic release rate, the same acreage should
be used in both the historic release rate and detention pond sizing calculations. In this case, the historic
release rate and detention pond sizing calculations should have been based on the proposed project area of 9
acres.
However, to be consistent with water hauling USR applications that were reviewed subsequent to this
application, Public Works will allow the applicant to provide a water quality pond that is at least 6,000 cubic feet
in size in lieu of the full size storm water detention pond. Although a water quality pond can be utilized at this
point, the applicant should be aware that future development which increases the impervious area on the site
may require upgrading water quality pond to a full sized storm water detention pond.
If the applicant chooses to provide only a water quality pond at this time, please show the water quality pond
on the plat. Place the water quality pond in a drainage easement that is delineated on the plat and labeled as
a "No Build or Storage Area". Also label the capacity of the water quality pond on the plat.
If the applicant chooses to provide a full size storm water detention pond at this time, please correct the
calculations to properly reflect the historic runoff rate and the correct detention pond sizing.
Improvements Agreement:
This Use by Special Review will be subject to a designated haul route and any intersection improvements such
as adequate turning radiuses, dust control if needed, on-site improvements or upgrades necessary to
accommodate this type of use.
Grading Permit: Prior to recording of the final plat, the applicant needs to submit a grading permit showing:
proposed grading, erosion control placement, typical details for all BMPs to be utilized, and a Construction
Stormwater permit from the Colorado Department of Public Health and Environment. The permit must be
stamped by a registered professional engineer licensed in the State of Colorado.
2012-0339
Page 1 of 1
M:\PLANNING—DEVELOPMENT REVIEW\USR-Use by Special Review\USR-1787 Dietzler Water Resources\USR-1787,Dietzler Water Resources
Corp Final Drainage Report Comments.docx
Pt.a)a5
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