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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna W.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> a. 304 East Weber Avenue, Third Floor <br /> m; — Director Mike Huggins,R.E.H.S.,R.D.I. <br /> AlOlsen,R.E.H.S. Stockton, California 95202-2708 <br /> �:• Douglas W.Wilson,R.E.H.S. <br /> • .._ —� r Program ManagerTelephone: (209) 468-3420 Margaret Lagorio,RT.H.S. <br /> ario.R;a <br /> Laurie A.Cotulla,R.E.H.S. Fax: (209) 464-0138 Robcrt McClcllon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> MS SANDI SARALE AUG 12 2004 <br /> P O BOX 6066 <br /> STOCKTON CA 95205 <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 /> Quarterly Report — Second Quarter 2003 (QR2103), Quarterly Report — Fourth <br /> Quarter 2003 (QR 4103) and Quarterly Report — First Quarter 2004 (QR1104); <br /> prepared by Advanced GeoEnvironmental, Inc. (AGE) for the above-referenced <br /> site. <br /> QR 2/03 describes the installation of ground water monitoring wells (MW-1 <br /> through MW-4) and presents the findings resulting from laboratory analysis of <br /> selected soil samples. All of the quarterly reports present the findings from the <br /> quarterly ground water monitoring events. <br /> Soil samples collected at depths of 10 feet below surface grade (bsg) and 19 feet <br /> bsg from each boring were submitted for laboratory analysis. Neither soil sample <br /> from boring MW-4 was impacted by the fuel components of interest. The 10-foot <br /> samples from boring MW-1, MW-2 and MW-3 were impacted by various fuel <br /> components- the 19-foot sample from boring MW-3 near the former underground <br /> storage tank (UST) location, was the only deeper soil sample impacted. The soil <br /> textures described are predominantly organic-rich fine-grained soil, with silty or <br /> clayey sand locally encountered at total depth in the borings. <br /> The depth to ground water varies from approximately 2.8 to 6.4 feet bsg, most <br /> commonly encountered between 5 to 6 feet bsg; the flow direction has been <br /> inferred to be variably toward the southeast. Ground water samples collected <br /> from monitoring wells MW-1, MW-2 and MW-3 have been impacted by petroleum <br /> hydrocarbons such as total petroleum hydrocarbons as gasoline (TPH-g) at <br /> concentrations ranging from 770 micrograms per liter (pg/1) to 10,000 µg/I and <br /> benzene at 78 to 900 VLg/I. Toluene, ethyl benzene and total xylenes have also <br /> been detected in samples from MW-1, MW-2 and MW3. The fuel oxygenate <br /> methyl-tent butyl ether (MTBE) has been consistently detected in samples from <br />