Email: David Lazarus
The Chesapeake Bay TMDL
Virginia Draft Phase II Watershed Implementation Plan available
Virginia's Phase I Watershed Implementation Plan for the Chesapeake Bay TMDL
In 1998, major portions of Chesapeake Bay and its tidal tributaries within Virginia were identified as not meeting water quality standards and listed as impaired. Areas of the Bay and tidal rivers within Maryland, Delaware and the District of Columbia are also on the federally approved list of impaired waters. The main pollutants causing these impairments are nitrogen, phosphorus, and sediment. Significant efforts have been taken and resources expended by federal, state, and local governments and other interested parties throughout the entire 64,000 square mile Chesapeake Bay watershed. Despite these efforts the water quality goals under the Clean Water Act have yet to be met.
Because these Bay waters remained on the impaired waters list, EPA required that a Total Maximum Daily Load (TMDL) be developed. EPA issued the Bay TMDL on December 29, 2010. It was based, in part, on the Watershed Implementation plans developed by the Bay watershed states and the District of Columbia.
The Chesapeake Bay TMDL addresses all segments of the Bay and its tidal tributaries that are on the impaired waters list. As with all TMDLs, a maximum aggregate watershed pollutant loading necessary to achieve the Chesapeake Bay’s water quality standards has been identified. This aggregate watershed loading is divided among the Bay states and their major tributary basins, as well as by major source categories [wastewater, urban storm water, onsite/septic agriculture, air deposition]. To review the TMDL, visit http://www.epa.gov/reg3wapd/tmdl/ChesapeakeBay/tmdlexec.html
Virginia submitted its Phase I Watershed Implementation Plan (WIP) in November (2010) and EPA accepted that plan and included it in the Chesapeake Bay TMDL with minor modifications. Included in Virginia's WIP I was a proposal to review the James River numeric chlorophyll standard. DEQ will undertake a comprehensive review of the existing James River Site-Specific Numeric Chlorophyll-a Criteria and associated modeling framework for the tidal James River to determine the best scientific basis for the standard. Additional information related to this study is available here: http://www.deq.virginia.gov/wqs/rule.html#James_Chl_A_study
Chesapeake Bay TMDL Development
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Stakeholder Advisory Group (SAG)
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SAG II, Phase II WIP (due 2012)