Virginia Regulatory Town Hall
Department of Environmental Quality
State Water Control Board
Water Quality Standards [9 VAC 25 ‑ 260]
Action Rulemaking to Adopt Numeric Turbidity Criteria
Comment Period Ended on 5/12/2021
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5/11/21  10:45 am
Commenter: David Hopkins

Turbidity standard

I have been monitoring Cedar Grove Creek in Rockbridge County for approximately ten years and in the last two years I have been measuring turbidity monthly for the Chesapeake Monitoring Cooperative. This creek is subject to sediment runoff after rain and its clarity changes as a result of the runoff.  Since it is a shallow waterway the 120 cm turbidity tube appears to be an appropriate method to determine changes in water clarity.  If the water is sediment laden it will reflect a turbidity tube reading of less than 120 cm.  When it is clear it exceeds 120 cm.  Thank you.

CommentID: 98287