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California Reglonal Water Quality CAtrol Board,. ;_ :� <br /> Central Valley Region , <br /> Robert Schneider,Chair r-Gra Davis <br /> Winston H.Hickox Y <br /> Secretaryfor Sacramento Main Office ` Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 -C <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 N <br /> W <br /> 13 September 2001 <br /> Ms. Nancy Bishop <br /> Western Farm Service <br /> 3650 Mt. Diablo Blvd., Suite 260 <br /> Lafayette, CA 94549 <br /> CONDITIONAL APPROVAL OF WORK PLAN FOR FIELD SCALE PILOT TEST, <br /> REVIEW OF REPORTS, WESTERN FARM SER VICE, VERNALIS, SAN JOA QUIN <br /> COUNTY <br /> Western Farm Service (WFS) operates a retail distribution facility for agricultural chemicals in <br /> Vernalis. WFS and its consultant, GeoSyntec Consultants, are investigating the extent of <br /> groundwater contamination, are pumping and treating groundwater, and investigating additional <br /> remedial strategies. WFS' pump and treat system consists of extracting groundwater, treating it <br /> with a carbon adsorption system, and using the treated water to meet its seasonal process water <br /> demands. GeoSyntec prepared the following reports describing current and proposed activities: <br /> • 14 July 2000 Capture Zone Analysis <br /> • 31 January 2001 2000 Annual Report and Results of 2000 Fourth Quarter Groundwater <br /> Monitoring <br /> • 24 April 2001 Results of February 2001 (First Quarter) Groundwater Monitoring <br /> • 8 June 2001 Work Plan for Field-Scale Pilot Test(Work Plan) <br /> • 27 July 2001 Results of 11 June 2001 (Second Quarter) Groundwater Monitoring <br /> We have the following comments on these reports: <br /> Capture Zone Analysis <br /> In 1999, the Regional Board adopted NPDES Order No. 99-013 authorizing WFS to discharge <br /> groundwater directly to the irrigation canal, Lateral 4 North. One of the terms of the order <br /> specifies that no discharge shall occur if the electrical conductivity (EC) of the receiving water <br /> exceeds 700 µmhos/cm. EC measurement records show that the period of allowable discharges <br /> are less than five days per season and at unpredictable intervals. Therefore, WFS does not intend <br /> to pursue discharge to the lateral. <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of <br /> simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />