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ENVIRONMENTAL HEALTH 1JEPARTMENT
<br /> SAN JOAQUIN COUNTY
<br /> ,._�•.:c Unit Supervisors
<br /> ?, Donna K.Heran,R.E.H.S.
<br /> 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S.
<br /> Director Mike Huggins,R.E.H.S.,R.D.I-
<br /> AI Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S.
<br /> • .p Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S.
<br /> ani Foy`' Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S.
<br /> Program Manager Fax: (209) 454-0138 Mark Barcellos,R.E.H.S,
<br /> MS SANDI SARALE NOV 2 7 2002-
<br /> P O 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 /> Monitoring Well Installation Work Plan, dated 05 September 2002, (WP);
<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. In May 2002, three soil probe
<br /> borings were advanced to collect soil and groundwater samples to assess for fuel
<br /> components in areas of the former UST pit, the former dispenser, and along the
<br /> product piping. The findings of the May 2002 investigation were as follows:
<br /> • 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 (BTEX). 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 mglkg toluene,
<br /> 51 mglkg ethyl benzene, and 290 mg/kg total xylenes.
<br /> • 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 (µg/l) TPH-g, 27,000 µg/l benzene, 29,000 µg11
<br /> toluene, 3,700 µg11 ethyl benzene, 22,000 µg11 total xylenes, and
<br /> 1,500 µg/l MTBE.
<br /> The WP proposes to advance four soil borings to 19 feet below surface grade
<br /> (bsg) to collect soil samples for further site characterization and to install four
<br /> ground water monitoring wells. The wells will be screened from 4 feet to 19 feet
<br /> bsg. The soil samples will be described on boring logs and selected samples will
<br /> be analyzed for TPH-g, BTEX, the five fuel oxygenates, 1,2-dichloroethane (1,2-
<br /> DCA), and dibromoethane by EPA Method 82606. The wells will be developed
<br />
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