Virginia Administrative Code
Title 9 - ENVIRONMENT
Agency 25 - STATE WATER CONTROL BOARD
Chapter 875 - VIRGINIA EROSION AND STORMWATER MANAGEMENT REGULATION
Part V - Criteria and Requirements for Regulated Land-Disturbing Activities
Article 3 - Water Quantity and Water Quality Technical Criteria
Section 9VAC25-875-590 - Water quality compliance

A. Compliance with the water quality design criteria set out in subdivisions A 1 and A 2 of 9VAC25-875-580 shall be determined by utilizing the Virginia Runoff Reduction Method or another equivalent methodology that is approved by the department.

B. The BMPs listed in this subsection are approved for use as necessary to effectively reduce the phosphorus load and runoff volume in accordance with the Virginia Runoff Reduction Method. Other approved BMPs found through the Virginia Stormwater BMP Clearinghouse may also be utilized. Design specifications and the pollutant removal efficiencies for all approved BMPs are found through the Virginia Stormwater BMP Clearinghouse.

C. Nonproprietary BMPs differing from those listed in subsection B of this section shall be reviewed and approved by the director in accordance with procedures established by the department.

D. Proprietary BMPs listed through the Virginia Stormwater BMP Clearinghouse are approved for use in accordance with the Virginia Runoff Reduction Method. Any proprietary BMP approved for use after July 1, 2020, must meet the requirements of § 62.1-44.15:28A 9 of the Code of Virginia.

E. A VESMP authority may establish limitations on the use of specific BMPs in accordance with § 62.1-44.15:33 of the Code of Virginia.

F. The VESMP authority or department as the VSMP authority shall have the discretion to allow for application of the design criteria to each drainage area of the site. However, 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 9VAC25-875-660.

G. Offsite alternatives where allowed in accordance with 9VAC25-875-610 may be utilized to meet the design criteria of subsection A of 9VAC25-875-580.

H. Any publicly owned treatment works that is permitted under the watershed general VPDES permit pursuant to § 62.1-44.19:14 of the Code of Virginia and is constructing or expanding the treatment works, wastewater collection system, or other facility used for public wastewater utility operations may, in accordance with § 62.1-44.19:21.2C of the Code of Virginia, permanently retire a portion of the publicly owned treatment works' wasteload allocation to meet the design criteria of subsection A of 9VAC25-875-580. Notice shall be given by such applicant to the VESMP authority and to the department.