Virginia Regulatory Town Hall
Department of Conservation and Recreation
Virginia Soil and Water Conservation Board
Stormwater Management Regulations AS 9 VAC 25-870 [4 VAC 50 ‑ 60]
Action Amend Parts I, II, and III of the Virginia Stormwater Management Program Permit Regulations to address water quality and quantity and local stormwater management program criteria.
Stage Proposed
Comment Period Ended on 8/21/2009
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8/20/09  2:51 pm
Commenter: Shelby T. Hertzler, PE (former TAC member from the Shenandoah Valley)

Karst comments for prop. Stormwater Regs

Within 4VAC50-60-85 Section E: "impoundment structures or facilities shall only be constructed in karst features after completion of a geotechnical investigation..."  This should be changed to apply to karst areas instead of specific features. I hope never, if rarely, would a stormwater basin be built in a sinkhole; but there are many cases of basins being built in close proximity to a sinkhole which have failed due to underlying soluble bedrock.

Also in Section E: "The person responsible for the land-disturbing activity is encouraged to screen for known existence of heritage resources in the karst features." From my time on the TAC, I believe this was intended to require screening for Natural Heritage Resources (rare, threatened, or endangered animals, plants, or natural communities) that could be impacted by a project.

Finally, a definition for karst areas would be helpful in 4VAC50-60-10 Definitions.

Thanks and good luck,


CommentID: 9792