Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Water Quality Analysis of Zinc in Middle Patuxent River, Howard County, Maryland.
CORP Author Maryland Dept. of the Environment, Baltimore.; Environmental Protection Agency, Philadelphia, PA. Region III.
Year Published 2009
Stock Number PB2013-107260
Additional Subjects Water quality ; Zinc ; Maryland ; Sediments ; Watersheds ; Sample stations ; Metal detection ; Toxicity ; Nutrients ; Biological assessments ; Aquatic life ; Total Maximum Daily Loads(TMDLs) ; Middle Patuxent River(Maryland) ; Howard County(Maryland)
Library Call Number Additional Info Location Last
NTIS  PB2013-107260 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 11/19/2013
Collation 19p
Section 303(d) of the federal Clean Water Act (CWA) and the U.S. Environmental Protection Agencys (EPA) implementing regulations direct each state to identify and list waters, known as water quality limited segments (WQLSs), in which current required controls of a specified substance are inadequate to achieve water quality standards. This list of impaired waters is commonly referred to as the 303(d) list. For each WQLS, the State is to either establish a Total Maximum Daily Load (TMDL) for the specified substance that the waterbody can receive without violating water quality standards, or demonstrate that water quality standards are being met. Middle Patuxent River (basin code 02131106), located in Howard County, Maryland, was identified on the States list of WQLSs as impaired by zinc (Zn) (1996), sediments (1996), nutrients (1996), and impacts to biological communities (2004 listing). The information used for listing Zn is suspect due in part to sampling and analysis methods available at the time, and assessment inconsistencies that led to the listing in 1996.