Department of Environmental Quality

 

GDForum ID: 416

Description of Proposed Guidance Document Changes

This guidance supersedes all agency Monitoring of Lakes and Reservoirs prior to 2020 and provides direction to agency staff on how to implement lake/reservoir water quality monitoring. Significant updates to this guidance since 2002 include implementing the new surface water quality standard regulation (9 VAC 25-260-187), effective as of August 14, 2007, which added nutrient criteria for significant man-made lakes and reservoirs and the two natural lakes in Virginia. Triennial Review updates to 9 VAC 25-260-187 include the definition of lacustrine zone, which allows for dissolved oxygen sampling throughout the lake to determine thermal stratification and adds several additional lakes (8) to the significant lakes list. Updates to 9VAC25-260-50 include applying dissolved oxygen and pH criteria only to the epilimnion of thermally-stratified lakes listed in 9 VAC 25-260-187. In 2020, all references to lake/reservoir assessment methodology were moved to DEQ’s Water Quality Assessment Guidance Manual. Changes to this document are shown as strikeouts/underlines in the proposed document.

 

Guidance Document(s) for this Comment Forum

Document ID	Document Title	Document in Effect	Proposed Document
GM09-2005	Monitoring and Assessment of Lakes and Reservoirs	Document	Proposed Document	Posted with Revised Changes on 12/14/2020

 

Contact Information

 

  Contact Information