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United States Department of Agriculture

Agricultural Research Service

Research Project: Technical Review of Water Quality Standards for Electrical Conductivity and Sodium Adsorption Ratio Project Number: 2036-61000-016-16
Project Type: Reimbursable

Start Date: Sep 15, 2010
End Date: Sep 14, 2015

Objective:
Evaluate the technical merit of water quality standards (WQS) and/or effluent limits for electrical conductivity (EC) and sodium adsorption ratio (SAR) including: a. Identify relevant science on EC/SAR. b. Assist EPA in determining whether Montana’s water quality standards for EC and SAR are protective of designated uses and based on sound scientific rationale. c. Assist EPA in determining whether Northern Cheyenne tribe’s water quality standards for EC and SAR are protective of designated uses and based on sound scientific rationale. d. Assist EPA in determining whether Wyoming effluent limits or water quality standards for EC and SAR are protective of designated uses and based on sound scientific rationale.

Approach:
Review selected public comments submitted to Montana (to be identified by EPA) and make recommendations to EPA on which technical issues have merit and provide assistance in identifying any relevant data/literature for EPA's consideration. Review Montana's response to comments, identify any issues with the scientific basis of the State's response, and make recommendations to EPA on whether the Agency needs to supplement the State’s response in its action letter. Review and comment on sections of EPA's draft action letter describing the Agency’s analysis of the current science and approval/disapproval determination regarding whether the EC and SAR criteria are protective of designated uses and are based on sound scientific rationale. Review selected public comments submitted to the Northern Cheyenne Tribe (to be identified by EPA) and make recommendations to EPA on which technical issues have merit and provide assistance in identifying any relevant data/literature for EPA's consideration. Review the Tribe's response to comments, identify any issues with the scientific basis of the Tribe's response, and make recommendations to EPA on whether the Agency needs to supplement the Tribe’s response in its action letter. Review specific permits identified by EPA and provide comments on whether the effluent limits for EC and SAR for Wyoming are protective of designated uses and based on sound scientific rationale. Review proposed WQS or revised Agricultural Use Policy (Policy) and provide comments to EPA on whether the proposed WQS/Policy are protective of designated uses and are based on sound scientific rationale.

Last Modified: 11/28/2014
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