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California Regional Water Quality Control Board <br /> } <br /> Central Valley Region <br /> Winston H.Hickox Robert Schneider,Chair <br /> Secretary for Gray Davis <br /> Environmental Sacramento Main Office Governor <br /> Protection Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br /> 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> TO: Technical Staff FROM: Thomas R. Pink-os <br /> Sacramento, Fresno and Executive Officer <br /> Redding Offices <br /> DATE: 9 June 2003 SIGNATURE: <br /> SUBJECT: CONSISTENT USE OF WATER QUALITY LIMITS <br /> Staff continue to cite a variety of limits for the same water quality constituents or parameters in same or <br /> similar situations. By way of example, two very different limits were used to determine reasonable <br /> potential to exceed water quality standards for chloroform in surface waters to protect municipal and <br /> domestic supplies in NPDES permits brought before the Board last week. Such inconsistency <br /> undermines the credibility of our regulatory decisions and fosters arguments in support of those seeking <br /> to appeal Board-adopted orders. - - - <br /> The attached memo, Selecting Numerical Receiving Water Quality Limits, contains procedures designed <br /> to improve consistency and defensibility in selecting water quality-based receiving water limits for <br /> surface water and groundwater in the Central Valley Region. Please take time to carefully review this <br /> memo and to use it in your work. Training sessions have been conducted in all of our offices to <br /> reinforce concepts and procedures contained in this memo. Additional training sessions will be provided <br /> as needed. <br /> While the memo is based on Central Valley Region and State Board policies and plans, it is not intended <br /> to establish new policy or regulation. The memo has been considered by our Region's Consistency <br /> Advisory Group, which consists of our Assistant Executive Officers, Supervisors and myself, assisted by <br /> legal counsel. Several Seniors also participated in this review. Their comments have been incorporated <br /> and addressed. <br /> Please contact Jon Marshack for assistance in using the procedures contained in the attached memo, with <br /> any questions you may have, or with suggestions for improving these procedures. <br /> Attachment <br /> cc: Frances McChesney, OCC, SWRCB <br /> Catherine George, OCC, S WRCB <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />