Water quality in the anacostia river
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Water Quality in the Anacostia River. Tony Smith December 1, 2005. Introduction. Purpose: identify sources of contaminant Data NHD (USGS) NED (USGS) Land cover (USGS) USGS bioavailability studies (Phelps 2002, 2003, 2004) Conclusion. PAHs. Polycyclic aromatic hydrocarbons

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Water Quality in the Anacostia River

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Water quality in the anacostia river
Water Quality in the Anacostia River

Tony Smith

December 1, 2005


Introduction
Introduction

  • Purpose: identify sources of contaminant

  • Data

    • NHD (USGS)

    • NED (USGS)

    • Land cover (USGS)

    • USGS bioavailability studies (Phelps 2002, 2003, 2004)

  • Conclusion


Water quality in the anacostia river
PAHs

  • Polycyclic aromatic hydrocarbons

    • occur naturally

    • produced in combustion reactions

  • Known or suspected carcinogens and mutagens

  • Integrated Risk Information System

    • RfD (naphthalene): 20 μg / kg day (estimate of daily exposure to population without appreciable deleterious effect)


The anacostia river
The Anacostia River

  • Watershed

    • covers 176 square miles

    • home to 800,000

  • Three main drainage areas

    • northwest (32%)

    • northeast (45%)

    • Tidal (23%)

  • 1988 - 1995: spills totaling 60,000 gallons

  • “One of America’s 10 worst rivers”


Huc 02070010 middle potomac anacostia occoquan
HUC 02070010Middle Potomac-Anacostia-Occoquan




Predictions based on land cover
Predictions based on land cover

  • High concentrations in tidal drainage streams

  • Little contaminant contribution from NW and NE branches





Summary of data and conclusion
Summary of Data and Conclusion

  • 20 of 23 higher than reference (p<0.05)

  • Clam survival 6 – 98%

  • NE and Tidal Branches are primary contributors

    • Beltsville Agricultural Research Center is US EPA National Priority Site

    • US Navy Yard, Washington Gas Light Facility



Additional factors
Additional Factors

  • Sediment

    • Stream gage

    • Suspended sediment

    • Precipitation

  • Frequency of water quality monitoring

  • Scope of land cover classification

  • EPA Priority Sites



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