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STATE OF CALIFORNIA - Environmental Prot- Agency 6 �iZC�. 00 CALIFORNIA REGIONAL We-I LH n I t CONTROL ROL BOARp PETE WILSON Governor CENTRAL VALLEY REGION f 3443 Routier Road, Suite A - Sacramento, CA 95827-3098 PHONE: (916) 255-3000 L�S:.z ii_-,e'.tiri:y) ; FAX: (976) 255-3015 �iy DY/JI-P.1'Cz3 13 January 1995 ;sn J Ms- Catherine Whitworth Trustee in Bankruptcy for Cal Farm Supply P.O. Bolt 280 Davis, CA 95617 - REQUEST FOR FURTHER INVESTIGATION. CAL FARM SUPPLY, STOC%TON Thank you for submitting the Groundwater Sampling Results - Fourth Quarter 1994 report for the former Cal Farm Supply facility on West Washington Street, Stockton. I have reviewed the ' - pesticide and nitrate portion of the report, while Diane Hinson of San Joaquin County Public Health Services has reviewed the petroleum portion. This letter incorporates both agencies' comments and concerns. Staff are not comfortable with the groundwater gradient information generated at this..site. Gradient determinations.over the last few years have shown large.shifts, and the groundwater elevations measured in November 1994 do not correspond with those measured at the adjacent site on the same day. In order to develop accurate data, and to determine whether Cal Farm Supply is indeed- found for the constituents found in the groundwater beneath the site, we will require that the five monitoring wells be re-surveyed. The re-surveying must be completed by a licensed surveyor. The wells shall be surveyed relative to the bench mark south of Washington Street and east of the railroad tracks which border Cal Farm Supply. Staff from either the Regional Board or San Joaquin County must be present during the - surveying. - By 15 February 1995, please submit a re-surveying report. The report should contain (a) the surveying notes and calculations signed by a licensed surveyor; (b) any re-calculations which are necessary to determine the gradient for the last four sampling events; and (c) re-calculated gradients for the last four sampling events. Upon receipt of the re-surveying report, we will advise you as to the further steps which will be necessary to assess and/or remediate the chemicals found in the groundwater. beneath the site. If you havef any questions, I can be reached at (916) 255-3104. WENDY WYE ILS Ag Regulatory Unit cc: Ms. Kelye McKinney, Kennedy/Jenks Consultants, Sacramento Ms. Diane Hinson, San Joaquin County Public Health Service, Stockton