GWMP Chesapeake Bay Action Plan

This Chesapeake Bay Total Maximum Daily Loads (TMDL) Action Plan documents how the National Park Service (NPS) intends to meet the "Special Condition for Chesapeake Bay TMDL" in Section I, Part C of the George Washington Memorial Parkway's (GWMP's) General Permit for Discharges of Stormwater from Small Municipal Separate Storm Sewer Systems (MS4s). The GWMP's most recent permit (VAR040100) was issued by the Virginia Department of Environmental Quality (DEQ) effective July 1, 2013 and will expire June 30, 2018.

The GWMP's MS4 permit requires the development and implementation of action plans for impaired streams where a TMDL has been established. The GWMP has been assigned a waste load allocation (WLA) as part of the TMDL that has been approved by the State Water Control Board. A TMDL establishes the maximum amount of a pollutant that can enter a water body without violating water quality standards.

A TMDL for the Chesapeake Bay was established by the U.S. Environmental Protection Agency (EPA) in 2010. Pollutants of concern (POCs) identified for the Chesapeake Bay include total nitrogen (TN), total phosphorus (TP), and total suspended solids (TSS). Virginia subsequently developed and adopted a Watershed Implementation Plan (WIP) that establishes the basic framework for meeting the Chesapeake Bay TMDL. The Virginia WIP commits MS4 permit holders to a phased approach for meeting required load reductions over three five-year permit cycles in accordance with the following: 5% of required reductions by the end of the first permit cycle (June 30, 2018); a total of 40% of required reductions by the end of the second permit cycle; and, 100% of required reductions by the end of the third permit cycle.

This Chesapeake Bay TMDL Action Plan calculates the 5% reduction target and establishes the means and methods for achieving the reduction target in accordance with the MS4 permit and the final Chesapeake Bay TMDL Special Condition Guidance developed by DEQ (Guidance Memo No 15-2005) dated May 18, 2015. Reductions in excess of 5% will be applied to the second permit cycle requirements.

Document Content:

GWMP Chesapeake Bay TMDL Action Plan - FINAL - 06.13.2017.pdf   (544.1 KB, PDF file) Disclaimer: Links within the above document(s) were valid as of the date published. Note: Some of the files may be in PDF format and can be viewed using the Adobe Acrobat Reader software. You may download a free copy of from Adobe Systems.