builtupon surface waters and area (the "10/70 incorporate best option") in addition management to the new practices, as defined development in Rule .0202 of this approved in Section, to compliance with the minimize water appropriate quality impacts; requirements of (ii) Critical Area Nonpoint Sub-Item Source and Stormwater (3)(b)(i)(A) of this Pollution Control Criteria: Rule. For (A) Low Density expansions to Option: new existing development development, the activities that existing built-upon require a surface area shall not be counted Control Plan in toward the allowed accordance with 70 percent 15A NCAC 4 surface area. A established by the local government North Carolina having jurisdiction Sedimentation within the Control watershed may Commission or transfer, in whole or approved local in part, its right to government the 10/70 option programs as land area to another delegated by the local government Sedimentation within the Control watershed upon Commission shall submittal of a joint be limited to no resolution for more than two review by the dwelling units of Commission. When single family the designated water detached supply watershed development per area is composed of acre (or 20,000 public land, such as square foot lot National Forest excluding roadway land, local right-of-way), or 24 governments may percent builtupon count the public area for all other land acreage within residential and the designated watershed area development; outside of the stormwater runoff critical area in from the figuring the acreage development shall allowed under this be transported by provision. Each vegetated project shall, to the conveyances to the maximum extent maximum extent practicable, practicable; minimize builtupon (B) High Density surface area, direct Option: if new stormwater runoff development away from surface density exceeds the
builtupon surface area (the "10/70 option") in addition to the new development approved in compliance with the appropriate requirements of Sub-Item (3)(b)(i)(A) of this Rule. For expansions to existing development, the existing built-upon surface area shall not be counted toward the allowed 70 percent surface area. A local government having jurisdiction within the watershed may transfer, in whole or in part, its right to the 10/70 option land area to another local government within the watershed upon submittal of a joint resolution for review by the Commission. When the designated water supply watershed area is composed of public land, such as National Forest land, local governments may count the public land acreage within the designated watershed area outside of the critical area in figuring the acreage allowed under this provision. Each project shall, to the maximum extent practicable, minimize builtupon surface area, direct stormwater runoff away from surface waters and incorporate best management practices, as defined in Rule .0202 of this Section, to minimize water quality impacts; (ii) Critical Area Nonpoint Source and Stormwater Pollution Control Criteria: (A) Low Density Option: new development activities that require a Control Plan in accordance with 15A NCAC 4 established by the North Carolina Sedimentation Control Commission or approved local government programs as delegated by the Sedimentation Control Commission shall be limited to no more than two dwelling units of single family detached development per acre (or 20,000 square foot lot excluding roadway right-of-way), or 24 percent builtupon area for all other residential and development; stormwater runoff from the development shall be transported by vegetated conveyances to the maximum extent practicable; (B) High Density Option: if new development density exceeds the
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