9 Va. Admin. Code § 25-870-85

Current through Register Vol. 40, No. 22, June 17, 2024

Section 9VAC25-870-85 - [Repealed effective 7/1/2024] Stormwater management impoundment structures or facilities

A. Stormwater management wet ponds and extended detention ponds that are not covered by the Impounding Structure Regulations (4VAC50-20) shall, at a minimum, be engineered for structural integrity for the 100-year storm event.

B. Construction of stormwater management impoundment structures or facilities may occur in karst areas only after a study of the geology and hydrology of the area has been conducted to determine the presence or absence of karst features that may be impacted by stormwater runoff and BMP placement.

C. Discharge of stormwater runoff to a karst feature shall meet the water quality criteria set out in 9VAC25-870-63 and the water quantity criteria set out in 9VAC25-870-66. Permanent stormwater management impoundment structures or facilities shall only be constructed in karst features after completion of a geotechnical investigation that identifies any necessary modifications to the BMP to ensure its structural integrity and maintain its water quality and quantity efficiencies. The person responsible for the land-disturbing activity is encouraged to screen for known existence of heritage resources in the karst features. Any Class V Underground Injection Control Well registration statements for stormwater discharges to improved sinkholes shall be included in the SWPPP.

9 Va. Admin. Code § 25-870-85

Derived From Virginia Register Volume 30, Issue 2, eff. October 23, 2013; Repealed, Virginia Register Volume 40, Issue 8, eff. 7/1/2024.

Statutory Authority: § 62.1-44.15:28 of the Code of Virginia; Chapters 68 and 758 of the 2016 Acts of Assembly.