Document Type

Report

Department/Program

Virginia Institute of Marine Science

Publication Date

2-24-2017

Abstract

Section 303(d) of the Clean Water Act (CWA) and the United States Environmental Protection Agency’s (USEPA’s) Water Quality Planning and Management Regulations (40 CFR Part 130) require states to develop total maximum daily loads (TMDLs) for waterbodies that are exceeding water quality standards (WQSs). TMDLs represent the total pollutant loading that a waterbody can receive without violating WQSs. The TMDL process establishes the allowable loadings of pollutants for a waterbody based on the relationship between pollution sources and in-stream water quality conditions. By following the TMDL process, states can establish controls based on water quality conditions to reduce pollution from both point and nonpoint sources to restore and maintain the quality of their water resources.

There are eight bacteria impairments in this study area. The Chickahominy River, Gordon Creek, and Diascund Creek (tidal) are listed on Virginia's 303(d) list because more than 10% of the total samples in the assessment period exceeded the Primary Contact Use (recreational/swimming) enterococci single sample maximum criterion of 104 colony forming units per 100 mL (cfu/100 mL). The Beaverdam Creek, the freshwater Unnamed Tributary to Beaverdam Creek, Diascund Creek (non-tidal), Mill Creek, and Barrows Creek are listed on Virginia's 303(d) list because more than 10% of the total samples in the assessment period exceeded the Primary Contact Use (recreational/swimming) E. coli single sample maximum criterion of 235 colony forming units per 100 mL (cfu/100 mL). Table ES.1 shows the details of impairments and Figure ES.1 shows the locations of these impairments. more....

Description

Prepared for: Virginia Department of Environmental Quality

Keywords

TMDL, environmental monitoring

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