Agenda - 03-16-2010 - 7a - Laserfiche WebLink

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7 Attachment 2 Summary of Potential Implications for Orange County Current Draft Falls Lake Nutrient Management Rules 1. New Development Stormwater controls will require new development to achieve nutrient export limits of 2.2 pounds/acre/year for Total Nitrogen and 0.33 pounds/acre/year for Total Phosphorus. There will also be restrictions as to how much nutrient reduction will be required on-site, the remaining necessary reductions could be achieved off-site activities. Orange County would have to enforce these regulations locally as well as develop a Stormwater Management Plan which would need to be approved by the Division of Water Quality (DWQ). 2. Existing Development Nutrient load reduction targets will also be necessary for existing development. In Stage I, by 2021, nutrient loads from existing developed lands in Orange County would have to be no larger than the total nutrient load which was produced in the baseline year of 2006. In Stage II, additional reductions in nutrient loads from existing development would be required by 2041, with probably half of the required reductions achieved by 2036. Orange County would be required to develop a Load Reduction Program for approval by DWQ, as well as use the nutrient accounting tool which is under development by DWQ, to determine the baseline nutrient load which was produced in-the county in 2006, as well as at certain points in the future to determine compliance. Orange County may have to determine suitable locations for Best Management Practices (BMPs), i.e., stormwater controls, which could be required to be installed in order to offset the nutrient load emanating from existing developed lands in the county. Reductions in nutrient loading to surface water from septic tanks may also be required in Orange County under the existing development rules as currently drafted.