Agenda - 06-01-2010 - 7a - Laserfiche WebLink

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taking the package to the Environmental Management Commission for approval to go out to public comment in March 2010. Draft Nutrient Management Strategy Approach The following is an outline of the rule concepts that have been developed with input from the stakeholders and incorporated in draft rule text provided to the stakeholder subcommittees for review. Strategy Goal Meet chlorophyll -a standard lake -wide via reductions in nitrogen and phosphorus loading to surface waters by 30% and 70 %, respectively which equates to a 40% and 77% reduction from the 2006 baseline by all regulated sources. Staged Approach Given the large reduction needs, DWQ proposes an adaptive / staged approach: • Stage l: Initial reductions watershed -wide to ensure the chlorophyll -a standard is met in the lower lake. 10 years. • Stage 2: Additional reductions in upper watershed (above NC 50) to ultimately achieve the chl a standard lake -wide. Additional 15 years. • Stage 3: Additional reductions from existing development as needed and feasible up to 40% TN and 77% TP. Lake Water Quality Monitoring • Use support assessment every 2 years on Integrated Report cycle • Data window = 5 years preceding assessment • Example: 2016 -2020 data => 2021 assessment (for 2022 IR) Rule Stages by Source Type New Development Stormwater • Applies to all local governments • Achieve nutrient export rate targets: 2.2 lbs /ac /yr TN and 0.33 lbs /ac /yr TP o Based on 40% TN and 77% TP reductions from acreage weighted average export rate from buildable land in watershed Greatest reasonable level of nutrient control onsite, remaining achieved offsite Staged approach does not apply to New Development Rule Existing Development • Each local government achieves load reduction goals from existing developed lands • Stage 1 • Reduce existing development load to 2006 baseline levels • By 2021 (10 yrs) Stage 2 o Possible options: 2 rN 13