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ENVIRONMENTAL HEALTH DEPARTMENT <br /> °�'" SAN JOAQUIN COUNTY <br /> �o.�_,,<<c G Vnit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> a: { - <br /> N: L 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 /> 4�/FORr1 Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager FaX: (2O9) 464-0138 Mark Barcellos,R.E.H.S. <br /> A R AND M E GLOVER AUG 17 2004 <br /> FAYETTE MANUFACTURING CORPORATION <br /> P O BOX 61 <br /> TRACY CA 95378 <br /> RE: Fayette Manufacturing Corporation SITE CODE: 2233 <br /> 7675 Eleventh Street <br /> Tracy, California <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Summary Report of Additional Subsurface Investigation (SR), dated <br /> 11 August 2004, prepared by your consultant ATC Associates, Inc. (ATC). The SR <br /> conveys the procedures and findings from the April 2004 geoprobe and CPT <br /> investigation of the above-referenced site and the resulting recommendations of <br /> ATC. <br /> The CPT boring was advanced immediately down-gradient of the former <br /> underground storage tank (UST) pit to a depth of approximately 58 feet below <br /> surface grade (bsg); a soil sample was collected from a silty clay interval at 25 feet <br /> bsg and two hydropunch groundwater samples were collected from 14 to 19 feet <br /> bsg and 47 to 52 feet bsg. Laboratory analysis of the soil sample did not detect <br /> any of the analytes of interest; analysis of the ground water samples detected 62 <br /> micrograms per liter (µg/I) total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and 0.9 Etg/I benzene in the shallow water sample, but did not detect any <br /> of the analytes of interest in the deeper groundwater sample. ATC interprets the <br /> results to indicate that impacted ground water is present only within the sandy <br /> interval between 15 and 21 feet bsg(based on the CPT log) and that the vertical <br /> extent of impacted soil and ground water has been delineated. EHD concurs with <br /> that interpretation. <br /> The geoprobe investigation consisted of advancing three geoprobe borings <br /> between monitoring wells MW-4 and MW-5 to assess the soil and groundwater for <br /> the fuel components of interest. One soil sample from GP-1 collected at a depth of <br /> 10.5 feet bsg contained 7.0 milligrams per kilogram (mg/kg) TPH-g, 0.52 mg/kg <br /> benzene and 0.14 mg/kg total xylenes. None of the analytes of interest were <br /> detected in the other soil samples. The ground water samples collected from <br /> geoprobe borings GP-1 and GP-2, contained as much as 38,000 µg/I TPH-g, 98 <br /> pg/I benzene, 490 Etg/I toluene, 2500 µg/I ethyl benzene, and 6,700 µg/I total <br />