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111iv <br /> • °� California flegional Water Quality -.'�ontrol Board -= _ <br /> Central Valley Region <br /> Steven T.Butler,Acting Chair ``"�=' <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office _ Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 2 March 1999 <br /> Ms. Nancy Bishop <br /> Western Farm Service <br /> 3650 Mt. Diablo Blvd., Suite 260 <br /> Lafayette, CA 94549 <br /> REVIEW OF ANNUAL REPORT, REVISED MONITORING AND REPORTING PROGRAM, <br /> WESTERN FARM SERVICE VERNALIS, SAN JOAQUIN COUNTY <br /> We are in receipt of your 28 January 1999 document entitled 1998 Annual Report and Results of <br /> December 1998 Groundwater Monitoring, Western Farm Service, Inc., Vernalis. The report contains <br /> two recommendations to modify the quarterly groundwater monitoring program required by Monitoring <br /> and Reporting Program (MRP) No. 97-808. <br /> We agree with your recommendation to eliminate analysis by EPA Method 8140 because only one <br /> chemical was detected one time by this scan. However, we do not agree that analysis for Method 632 <br /> should be discontinued for wells MW-1, MW-4, and MW-5. The chemical diuron, part of the 632 scan, <br /> is consistently found in wells MW-2 and MW-3. The remaining wells also need to be analyzed for this <br /> chemical to make sure that the diuron plume is not spreading. <br /> Enclosed is a copy of the Revised MRP No. 97-808. The Revised MRP deletes the need to monitor by <br /> EPA Method 8140 on a quarterly basis,but does state that any new wells are to be analyzed at least once <br /> by this method. The MRP has also been updated to contain several recent standard provisions, including <br /> the requirement that monitoring reports must be prepared by a registered professional and that changes <br /> may not be made to an MRP until a revised MRP has been issued by the Executive Officer. <br /> If you have any questions,please contact Wendy Wyels at (916) 255-3080. <br /> WENDL. COHEN <br /> Senior Engineer <br /> Enclosure <br /> cc w/enc.: Ms. Karen Streich, GeoSyntec Consultants,Walnut Creek <br /> cc: Ms. Carol Oz, San Joaquin County Public Health Services, Stockton <br /> Mr. Frank Fossati, Shell Oil Products, Santa Ana <br /> Mr. Fred Strauss, Western Farm Service, Vernalis <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />