Oxon Run and C&O Canal TMDLs

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Presentation transcript:

Oxon Run and C&O Canal TMDLs March 8, 2004

Overview In settlement of the TMDL lawsuit in the District of Columbia, EPA has agreed to back stop TMDLs for waters included on the District's 1998 Section 303(d) list of impaired waters. To fulfill the consent decree requirements, EPA and the District to are sharing the TMDL development workload. EPA must approve or establish TMDLs for the Chesapeake and Ohio Canal and Oxon Run by December 15, 2004, in order to satisfy the requirements of the lawsuit.

Overview The District's 2002 Section 303(d) list of impaired waters identified the pollutant of concern as follows: Metals and bacteria as Oxon Run's pollutants of concern, and Bacteria and organics as the Chesapeake and Ohio Canal's pollutants of concern. The Consent Decree identifies "metals" as the substances identified in Table 2 of Section 1104.7 of the District's water quality standards, and, "organics" as the substances identified in Table 3 of Section 1104.7 of the District's water quality standards at 21 D.C.M.R. Chapter 11.

Pollutants of Concern Metals Pathogens Organics Bacteria Total polychlorinated biphenyls (TPCBs) Total polynuclear aromatic hydrocarbons (TPAHs) Chlordane DDT Dieldrin Heptachlorepoxide Gamma-BHC Endrin Mirex Endosulfane (II) Hexachorobenzene Metals Cadmium Chromium Lead Nickel Selenium Copper Mercury Arsenic Zinc

Task Overview Problem Identification Technical Approach Development Sources assessment Numeric Targets Technical Approach Development Allocation Scenarios (DOH) Draft TMDLs Final TMDLs

Schedule Sources assessment and the technical approach needs to be completed by June 1, 2004. Draft TMDL report submitted to Region 3 and DOH for internal review & comment by August 1, 2004. Revised draft TMDL to the Region and DOH (incorporating the comments) by September 1, 2004. Final TMDL report submitted to EPA by November 15, 2004. Final TMDL report must be approved by EPA by December 15, 2004.

Data and Information Categories of Data Watershed Physiographic data Weather Data Potential Pollutant Sources Water quality data Stream Flow Data

Status DOH is in the process of identifying the available monitoring data MDE has no instream water quality data related to these segments County Stormwater monitoring programs

Data Needs….. Watershed physiographic data Hydrographic data Weather data Watershed activities/use data and information related to Pollutant production Point sources and direct discharge data and information Environmental monitoring data Stream flow data

TMDL Contacts Mary F. Beck TMDL Technical Support EPA Region 3 (215) 814-3429 Beck.mary@epa.gov Jonathan Essoka DC TMDL Coordinator (215) 814-5774 Essoka.Jonathan@epamail.epa.gov Raed EL-Farhan The Louis Berger Group, Inc. Washington, DC (202) 912-0307 relfarhan@louisberger.com