The Mispillion and Cedar Creek River Watershed Pollution Control Strategy A Watershed-Based Strategy to Implement Total Maximum Daily Loads in Delaware December 2012 Prepared for the Mispillion and Cedar Creek River Tributary Action Team By the Watershed Assessmentand Management Section Frank Piorko, Director http://de.gov/pollutioncontrolstrategy Division of Watershed Stewardship MISPILLION AND CEDAR CREEK WATERSHEDS POLLUTION CONTROL STATEGY . 1 Overview of the Watershed ........................................................................................................ 4 Pollution Control Strategy for the Mispillion and Cedar Creek Watersheds.............................. 6 Development Process for the Pollution Control Strategy Recommendations ............................ 8 Mispillion River and Cedar Creek Watersheds Tributary Action Team ................................ 8 Current Best Management Practices in the Watersheds ........................................................... 10 Bacteria Reductions .............................................................................................................. 10 Stormwater Best Management Practices .................................................................................. 12 Agricultural Best Management Practices .............................................................................. 13 Wastewater Best Management Practices .............................................................................. 14 Pollution Control Strategy Recommendations.............................................................................. 14 Authority ................................................................................................................................... 14 Recommendations Relating to Existing and Future Developed Land .......................................... 15 1. A statewide ban phosphorous in residential automatic dishwasher detergents should be enacted by the General Assembly. (High Priority) ................................................................... 15 Implementation goal ............................................................................................................. 15 Basis for recommendation .................................................................................................... 15 Expected Reduction .............................................................................................................. 15 Nutrient Reducing Recommendations Effectiveness Criteria .............................................. 15 Cost ....................................................................................................................................... 15 Action Needed ...................................................................................................................... 15 2. Prioritize areas where failing individual, large, and community wastewater treatment and disposal systems can be eliminated by either connecting to a Waste Water Treatment Plant or retrofitted to meet current septic system performance standards. (High Priority) .................... 15 Implementation Goal 2 ......................................................................................................... 15 Basis for Recommendation ................................................................................................... 16 Expected Reduction .............................................................................................................. 16 Implementation Schedule ...................................................................................................... 16 Nutrient Reducing Recommendation Effectiveness Criteria 2 ............................................. 16 Cost ....................................................................................................................................... 16 Action Needed ...................................................................................................................... 16 3. Require Nutrient Management Plans for open space greater than 10 total acres within a development. (High Priority) .................................................................................................... 17 Implementation Goal 3 ......................................................................................................... 17 Basis for Recommendation ................................................................................................... 17 Expected Reduction .............................................................................................................. 19 Nutrient Reducing Recommendation Effectiveness Criteria 3 ............................................. 19 Cost ....................................................................................................................................... 19 Implementation Schedule ...................................................................................................... 19 Potential Funding Source ...................................................................................................... 20 Action Needed ...................................................................................................................... 20 4. DNREC should conduct a proactive search for and systematically eliminate cesspool and seepage pits. (High Priority) ..................................................................................................... 20 Implementation Goal 4 ......................................................................................................... 20 Basis for Recommendation ................................................................................................... 20 Implementation Schedule ...................................................................................................... 21 Expected Reduction .............................................................................................................. 21 Nutrient Reducing Recommendation Effectiveness Criteria 4 ............................................. 21 Cost ....................................................................................................................................... 21 Potential Funding Sources .................................................................................................... 21 Action Needed ...................................................................................................................... 22 5. Identify areas where stormwater retrofits would effectively reduce sediment and nutrients. (High Priority) ........................................................................................................................... 22 Implementation Goal 5 ......................................................................................................... 22 Basis for Recommendation ................................................................................................... 22 Implementation Schedule ...................................................................................................... 22 Expected Reduction .............................................................................................................. 22 Nutrient Reducing Recommendation Effectiveness Criteria 5 ............................................. 23 Cost ....................................................................................................................................... 23 Potential Funding Source ...................................................................................................... 23 Action Needed ...................................................................................................................... 23 6. Require Low Impact Development (LID) in new construction and development, including requiring any new development to achieve a stormwater flow and nutrient loading equal to or less than pre-development conditions. (High Priority) ............................................................. 23 Implementation Goal 6 ......................................................................................................... 23 Basis of Recommendation .................................................................................................... 23 Expected Reduction .............................................................................................................. 24 Nutrient Reducing Recommendation Effectiveness Criteria 6 ............................................. 24 Cost ....................................................................................................................................... 24 Potential Funding Sources .................................................................................................... 24 Action Needed ...................................................................................................................... 24 7. Implement a Stormwater Utility ........................................................................................ 24 Implementation Goal 7 ......................................................................................................... 24 Basis of Recommendation .................................................................................................... 24 Implementation Schedule ...................................................................................................... 25 Expected