Erosion & Sedimentation / Stormwater Management

Program Overview

A Chester County Conservation District Urban Resource Conservationist is assigned to each municipality in the county. 

Erosion and Sedimentation Program

Under a Delegation Agreement with the Pennsylvania Department of Environmental Protection (DEP), the District assumes local responsibility for specific program activities related to controlling erosion and the resulting sediment pollution for all types of earth moving activities.

NPDES Program

The District administers the National Pollutant Discharge Elimination System (NPDES) to ensure that Best Management Practices (BMPs) are implemented to control accelerated erosion and sedimentation pollution associated with land development projects. This permit specifically regulates the discharge of stormwater from construction activities. Individual and General NPDES permits are issued based on whether the receiving watercourse is High Quality(HQ), Exceptional Value (EV) or non-protected.

PCSM Spreadsheet Update:

An updated version of the PCSM Spreadsheet has been posted to DEP’s website (version 1.9, October 2021).  This version includes two updates to the Volume tab: 1) all of the post-construction impervious land covers are available to select for pre-construction, and 2) “Soil Amendments” is no longer a BMP option in the drop-down Structural BMP Table, and per the Instructions should be calculated via the PA SW BMP Manual and reported in the Non-Structural - Other Credits field.  

It is recommended to check DEP’s website and utilize the latest version of the spreadsheet for each PAG-02/Individual Permit Application, and to carefully review the PCSM Spreadsheet Instructions prior to, and during the completion of, the spreadsheet.

Municipal Inspector/Engineer Workshop Presentations