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'r <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> w < Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins, S.,R.D.I. <br /> Douglas W.Wilson, <br /> R.E.H.S. <br /> • cq, .��P • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> < i6 Laurie A.Cotulla,R.E.H.S. <br /> er ana M <br /> Program Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> g S Mark Barcellos,R.E.H.S. <br /> ALLEN FETTERS SEP 14 2004 <br /> RIPON FARM SERVICE INC <br /> 3705 PORTSMOUTH CIRCLE <br /> NORTH STOCKTON CA 95219 <br /> RE: Ripon Farm Service Inc. SITE CODE: 1605 <br /> 22871 South Highway 99 <br /> Ripon, California 95366 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the Quarterly <br /> Report — First Quarter 2004 prepared and submitted on May 14, 2004, by Advanced <br /> GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. In this report, <br /> AGE documents that in January 2004 the soil vapor extraction (SVE) system <br /> malfunctioned and operations ceased. Results from a soil vapor sample collected on <br /> December 22, 2003 indicated that total petroleum hydrocarbons as gasoline was present at <br /> a concentration of 34 micrograms per liter, and non-detect results were reported for methyl <br /> tertiary-butyl ether, benzene, toluene, ethyl benzene, and total..xylenes. Therefore, the SVE <br /> system was not restarted. Before taking the SVE system permanently off-line, EHD directs <br /> you to conduct a rebound test on the SVE system and report the results from the system <br /> and from each monitoring well. Submit the results from the SVE rebound test to EHD by <br /> November 10, 2004. <br /> AGE has recommended consideration of case closure for this site. However, EHD has <br /> concerns regarding the diesel contamination found in soil boring samples CB1, CB2, CB3, <br /> and CBS at twenty feet below surface grade, and the high concentrations of 1,2- <br /> dichloroethane (1,2-DCA) found in groundwater samples during the quarterly groundwater <br /> monitoring events. Groundwater contaminated by 1,2-DCA has not been delineated in the <br /> west and south directions at this site. Therefore, EHD cannot support a recommendation <br /> for site closure at this time. Additional information is needed. Please provide a work plan <br /> to EHD by November 3, 2004, to assess the lateral extent of 1,2-DCA contamination at this <br /> site. Upon completion of this assessment, provide mass estimates for diesel and 1,2-DCA <br /> at this site, along with a fate and transport model for both of these substances to assist in <br /> site closure consideration. Submit the results from the proposed site assessment, the mass <br /> estimates for diesel and 1,2-DCA, and the fate and transport models to EHD within six <br /> weeks of completing the fieldwork for additional site assessment. <br />