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首页> 美国政府科技报告 >Watershed Report for Biological Impairment of the Jones Falls Watershed in Baltimore City and Baltimore County, Maryland Biological Stressor Identification Analysis Results and Interpretation. Revised Final.
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Watershed Report for Biological Impairment of the Jones Falls Watershed in Baltimore City and Baltimore County, Maryland Biological Stressor Identification Analysis Results and Interpretation. Revised Final.

机译：巴尔的摩市和马里兰州巴尔的摩县琼斯瀑布流域的生物损害流域报告生物压力源识别分析结果和解释。修订最终版。

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Section 303(d) of the federal Clean Water Act (CWA) and the U.S. Environmental Protection Agencys (USEPA) 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. A water quality standard is the combination of a designated use for a particular body of water and the water quality criteria designed to protect that use. For each WQLS listed on the Integrated Report of Surface Water Quality in Maryland (Integrated Report), the State is to either establish a Total Maximum Daily Load (TMDL) of the specified substance that the waterbody can receive without violating water quality standards, or demonstrate via a Water Quality Analysis (WQA) that water quality standards are being met. The Jones Falls watershed (basin code 02-13-09-04), located in Baltimore County and Baltimore City, was identified on the States list of WQLSs and listed in the Integrated Report under Category 5 as impaired by chlordane, copper (Cu), lead (Pb), zinc (Zn), nutrients, suspended sediments (1996 listings), fecal coliform, polychlorinated biphenyls (PCBs) in fish tissue, and evidence of impacts to biological communities (2002 listings). The chlordane and PCBs listings are designated for the Lake Roland impoundment while the remaining listings apply to the non-tidal streams. The 1996 nutrients listing was refined in the 2008 Integrated Report and phosphorus was identified as the specific impairing substance. Similarly, the 1996 suspended sediment listing was refined in the 2008 Integrated Report to a listing for total suspended solids. The Jones Falls watershed was de-listed for heavy metals in 2004 following USEPA concurrence with Maryland Department of the Environments (MDE) analysis of heavy metal data collected during 2001-2002, which showed no heavy metals impairment, except for basin code 02-13-09- 04-10-32 where there were indications of Cu. A WQA for basin code 02-13-09-04-10- 32, requesting delisting for Cu, was included as an appendix to Marylands 2008 Integrated Report and approved by USEPA in 2008. TMDLs were approved for chlordane in 2001 and fecal coliform in 2008. A WQA of Zn was completed in 2003.

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