§ 124-4-3. Water Quality Compliance.

A.

Compliance with the water quality design criteria set out in subsections A and B of § 124-4-2 shall be determined by utilizing the Virginia Runoff Reduction Method or another equivalent methodology that is approved by the State Water Control Board.

B.

The BMPs listed in 9VAC25-870-65.B are approved for use, subject to the restrictions and conditions in the PFM, as necessary to effectively reduce the phosphorus load and runoff volume in accordance with the Virginia Runoff Reduction Method. Other approved BMPs found on the Virginia Stormwater BMP Clearinghouse Website may also be utilized, subject to review and approval by the Director. Design specifications and the pollutant removal efficiencies for all approved BMPs are found on the Virginia Stormwater BMP Clearinghouse Website. Modifications to the design specifications, to address local requirements, are included in the PFM.

C.

Where a site drains to more than one HUC, the pollutant load reduction requirements shall be applied independently within each HUC unless reductions are achieved in accordance with a comprehensive watershed stormwater management plan in accordance with § 124-4-9. Pollutant load reduction requirements to meet TMDL action plans developed by the County in accordance with the County's MS4 permit shall be applied independently to the areas of the site subject to the TMDL.

D.

Offsite alternatives where allowed in accordance with § 124-4-5 may be utilized to meet the design criteria of subsection A of § 124-4-2. (08-14-124.)