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Article 6: Development Standards Section 6.14: Stormwater Management Orange County, North Carolina – Unified Development Ordinance Page 6-99 (i) Nitrogen, 3.8 pounds per acre per year (ii) Phosphorus, 1.43 pounds per acre per year (B) The nutrient export from each new development shall be calculated in pounds per acre per year (using the approved accounting tool) in accordance with the methodologies approved by the NC DWQDEQ. (C) If a proposed development subject to nutrient load requirements contributes nutrients greater than the standards listed above, the developer may install structural stormwater BMPs stormwater control measures (SCMs) 9 to meet the required nutrient load standards or do a combination of BMPs SCMs and offset payments to achieve the standard. (D) Offset Payments (1) Offset fees may be permitted to meet the nutrient export levels set for new development. In order to utilize offset fees, the proposed new development subject to the nutrient load standards must attain nitrogen and phosphorus loading rate reductions on-site that meet the following criteria prior to using an offsite offset measure: (a) Falls Lake Watershed (i) 30% or more reduction in both nitrogen and phosphorus loading from the untreated conditions for any single-family, detached and duplex residential development disturbing one half acre but less than one acre; (ii) 50% or more reduction in both nitrogen and phosphorus loading from the untreated conditions for any single-family, detached and duplex residential development disturbing more than one acre; (iii) 30% or more reduction in both nitrogen and phosphorus loading from the untreated condition for other development, including multi-family residential, commercial and industrial development disturbing 12,000 square feet but less than one acre; (iv) 50% or more reduction in both nitrogen and phosphorus loading from the untreated condition for other development, including multi-family residential, commercial and industrial development disturbing more than one acre; (v) 30% or more reduction in both nitrogen and phosphorus loading from the untreated condition for proposed redevelopment activities in a designated downtown area that would replace or expand structures or improvements that existed as of December 2006. (b) Jordan Lake Watershed (i) Six pounds per acre per year nitrogen for single-family, detached and duplex residential development. (ii) Ten pounds per acre per year nitrogen for other development including commercial, industrial, and multi-family residential. (2) Offset fees may be paid to the North Carolina Ecosystem Enhancement Program (NCEEP), approved private mitigation bank, or other mitigation option as approved by the NC DWQ DEQ and Orange County. It is the policy of NC DWQ DEQand Orange County, as well as a requirement in certain watersheds, that offset payment funds be utilized where they are generated to the maximum 9 Nomenclature change to ensure consistency with State law. 9