To: Board of County Commissioners
Through: Bryan D. Weimer, Director, PWD
Prepared By:
prepared
Chuck Haskins, P.E., CFM, Engineering Services Division Manager
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presenter
Presenter: Lisa Knerr, Environmental Manager, Engineering Services Division
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Subject:
title
Updates to the County's Grading, Erosion, and Sediment Control (GESC) Manual
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Purpose and Request:
recommended action
The purpose of this General Business Item is to update the Board and seek direction on proposed changes to the County's Grading, Erosion, and Sediment Control (GESC) Manual. This item was discussed at the Board's November 1, 2022 Study Session. Public Works and Development staff recommend that the Board approve this update to the GESC Manual.
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Background and Discussion: The County has a permit certification from the Colorado Department of Public Health and Environment under the General Permit COR080000 Stormwater Discharges Associated with Municipal Separate Storm Sewer Systems (MS4s) that Discharge to the Cherry Creek Reservoir Drainage Basin Authorization to Discharge under the Colorado Discharge Permit System. The County's permit number under that general permit is COR080010. The County's MS4 permit requires the County to have a Construction Sites Program that requires "control measures to be implemented for all applicable development sites." The MS4 permit defines an "applicable development site" as a site that results in "land disturbance of greater than or equal to one acre, including sites less than one acre that are part of a larger common plan of development or sale, unless excluded below." The exclusions are not pertinent to the proposed revisions. The MS4 permit also requires the County to comply with Regulation 72-Cherry Creek Reservoir Control Regulation, which further requires the County to regulate all "land disturbances". The County's current GESC Manual meets all requirements of the MS4 permit.
In general, these proposed revisions...
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