9 Va. Admin. Code § 25-870-85 - [Repealed effective 7/1/2024] Stormwater management impoundment structures or facilities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.
Notes
Statutory Authority: § 62.1-44.15:28 of the Code of Virginia; Chapters 68 and 758 of the 2016 Acts of Assembly.
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