SITE INFORMATION AND CORRESPONDENCE

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.� California Regional Water Quality Control Board :yM vCentral Valley Region . Robert Schneider,Ch Ar Winston H.Hickox Gray Davis Secretaryfor Sacramento Maw Jffice ,ti, Governor Environmental Internet Address: http://www.swrcb.ca.gov/mgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95927-3003 Phone(916)255-3000•FAX(916)255-3015 MAYA 2 2003 ENVIRONf,l'_;, 30 April 2003 PERM!?.-,c :; Mr. Arnold Hof 28537 E. River Road Escalon, CA 95320 DRAFT MONITORING AND REPORTING PROGRAM, FORMER CAL FARM SUPPLY, 2040 W. WASHINGTON STREET, STOC%TON,SAN JOAQUIN COUNTY The site you purchased at 2040 West Washington Street in 2001 was formerly owned and operated by Cal Farm Supply, an agricultural chemical retail distributor. During Cal Farm Supply's ownership of the property,poor housekeeping practices contributed to detections of nitrate and various pesticides and herbicides in soil and groundwater. In addition, its underground fuel tank leaked introducing fuel constituents to soil and groundwater. Cal Farm Supply performed a soil and groundwater investigation, removed the fuel tank,removed contaminated soil, installed monitoring wells, and conducted groundwater monitoring between 1989 and 1999. You have sampled all of the monitoring wells for two consecutive semi-annual monitoring events in 2002 and have cultivated safflower in the southern portion of your property to take up nitrogen from groundwater, as you agreed in our 31 October 2001 meeting. hi our October meeting,we agreed to evaluate your monitoring data and prepare a draft Monitoring and Reporting Program. The enclosed draft MRP was developed from the monitoring information presented in the following reports prepared by your consultant, HydroGeoLogic Inc.: • 28 May 2002 April 2002 Groundwater Monitoring Report(April Report) • 13 January 2003 October 2002 Groundwater Monitoring Report(October Report) In the October Report, you requested that we remove ammonium, pesticides, and herbicides from the monitoring schedule based on limited detections in 2002, and reduce the frequency and extent of petroleum and MTBE analyses. We concur with most of your requests as discussed below. Draft Monitoring and Reporting Program We have reviewed the monitoring reports and compared the concentrations of constituents detected to the applicable water quality objectives to assess whether continued monitoring is California Environmental Protection Agency Q? Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. 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/mgcb5