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ENVIRONMENTAL HEALT11"DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K.Heran,R.E-H.S. Carl Borgman,R.E,H,S. <br /> 304 East Weber Avenue, Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> JUL i 2 2002 <br /> MS SANDI SARALE <br /> P 0 BOX 6066 <br /> STOCKTON CA 95206 <br /> RE: SARALE FARMS Site Code: 0850 <br /> 16500 CLIFTON COURT-RD <br /> STOCKTON CA 95206 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Preliminary Investigation and Evaluation Report, dated 21 June 2002, (PIER); <br /> prepared by Advanced GeoEnvironmental, Inc. (AGE) for the above-referenced <br /> site. A 10,000-gallon gasoline underground storage tank (UST) was removed <br /> from the site in December 1992, and fuel components were detected in soil <br /> samples collected at the time of the UST removal. The current scope of work <br /> included advancement of three soil probe borings to collect soil and groundwater <br /> samples to assess for fuel components. The probe boring locations were near <br /> the former UST pit, the former dispenser, and along the product piping. A brief <br /> summary of the current findings is as follows: <br /> 0 The 4.5- and 5-foot soil samples were all impacted by total petroleum <br /> hydrocarbons as gasoline (TPH-g), benzene, toluene, ethyl benzene and <br /> total xylenes (13TEX). The most impacted sample was from boring P2 <br /> situated along the product line. The sample contained 2,800 milligrams <br /> per kilogram (mg/kg) TPH-g, 24 mg/kg benzene, 120 mg/kg toluene, 51 <br /> mg/kg ethyl benzene, and 290 mg/kg total xylenes. <br /> 0 The three shallow groundwater samples were impacted by TPH-g, BTEX <br /> compounds and methyl tert-butyl ether (MTBE); P2 again yielded the most <br /> impacted sample. Grab ground water sample P2 contained 180,000 <br /> micrograms per liter (gg/1) TPH-g, 27,000 gg/I benzene, 29,000 µg/l <br /> toluene, 3,700 [Ag/1 ethyl benzene, 22,000 µg/l total xylenes, and 1,500 <br /> jag/I MTBE. <br /> AGE concluded that soil and ground water on the site had been impacted by the <br /> unauthorized release and recommended additional site assessment to delineate <br /> the vertical and lateral extent of impacted soil and groundwater. EHD concurs <br /> with the conclusion and recommendation. Please submit a work plan to further <br />