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

2. 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.

3. 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 of the District's water quality standards, and, "organics" as the substances identified in Table 3 of Section of the District's water quality standards at 21 D.C.M.R. Chapter 11.

4. 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

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

7. 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.

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

9. 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

10. 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

11. TMDL Contacts Mary F. Beck TMDL Technical Support EPA Region 3
(215)
Jonathan Essoka
DC TMDL Coordinator
(215)
Raed EL-Farhan
The Louis Berger Group, Inc.
Washington, DC
(202)