1. The District of Columbia: A Unique setting for the Chesapeake Bay TMDL Hamid Karimi District Department of the Environment

2. What Makes D.C. Unique From Other Jurisdictions Small, all regulated, all point sources Due to the regulated nature of D.C. all loading is transparent and easily accountable Implementation is difficultbecause of unique urban nature Options available are all challenging and expensive 2

3. Target Loadings(in million pounds per year) 3

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5. What Makes D.C. Unique From Other Jurisdictions D.C. encompasses 68.3 Square Miles D.C. has 3 major loading sources: Blue Plains CSO MS4 All sources regulated either by a permit or consent decree Image courtesy DC Water 5

6. Existing Nutrient Sources in DC Values from July 2010 Phase 5.3 Model Run 6

7. Percent (%) Reduction Required in Loadings 7

8. Implementation of TMDL DC Water Blue Plains WWTP – Enhanced Nitrogen Removal Cost: approximately $1 billion dollars Removes additional Nitrogen from wastewater before being discharged Improves quality of discharge to Anacostia and Potomac rivers during wet weather events Expected to be completed in 2015 Long Term Control Plan for CSOs Cost: approximately $2.2 billion dollars Will reduce CSO overflows by 96% Expected to be completed in 2025 Proposed D.C. MS4 Permit Cost estimated to be at least 13.2 million dollars per year Permit is valid for 5 years 8

9. Questions Hamid Karimi Deputy Director Office of Natural Resources District Department of the Environment 202-535-1660 hamid.karimi@dc.gov 9