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Public Works proposes simpler grading, erosion and sediment-control manual, delegation to SEMSWA for MS4 area
Summary
Public Works presented revisions to the county Grading, Erosion and Sediment Control manual to align with the MS4 permit renewal: fewer permit types, standardized plan templates, stricter topsoil/vegetation closeout requirements and delegation of routine implementation to SEMSWA in the MS4 area; commissioners supported placing the update on consent.
Public Works staff presented proposed updates to Arapahoe County's Grading, Erosion and Sediment Control (GESC) manual at the March 18 meeting, tying the changes to a forthcoming renewal of the county MS4 (Municipal Separate Storm Sewer System) permit.
Lisa (public works presenter) said the draft reduces five permit types to three (grading/erosion control permit, erosion-and-sediment-control permit, and a low-impact/streamlined pathway for minor work), standardizes the required GESC report into a one-page PDF template and harmonizes details with Mile High Flood District guidance. The manual also establishes a clearer delegation model: within the county’s MS4 area SEMSWA would implement roughly 99% of the manual, while the county would retain review authority for utilities and oil-and-gas appendices and continue to be accountable to the Board of County Commissioners.
A significant operational change is new topsoil requirements and vegetation closeout thresholds: sites must achieve a defined vegetative cover (the presenters cited a 70% target) or otherwise meet the revised stabilization criteria before final acceptance. Staff said Centennial and SEMSWA have piloted related topsoil measures since June and reported acceptable early results. The standardized, shorter GESC report is intended to reduce reviewer ambiguity and speed plan checks.
Commissioners asked about SEMSWA performance and historic complaints about implementation; staff said SEMSWA has been responsive, the county audited several projects and found no systemic findings, and the simplified permit structure should reduce confusion for applicants. The board signaled support for placing the manual update on a future consent agenda for formal adoption.
Public-works staff will return with the formal resolution and a recommended effective date; staff said the changes aim to align with federal MS4 requirements and reduce review time by clarifying expectations for applicants and inspectors.
