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r • <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K.Director <br /> R.E.H.S. Carl Bgins,an,R. R.E.H.S. <br /> Director 30�1' East Weber .�.V0nn0, Ttllr(1 Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> . - <br /> At Olsen,R.E.Hs. 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 /> 9iicoaN Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Fax: (209) 464-0138 <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> JUN 10 2003 <br /> KEN AND ED ENRICH <br /> TOP FILLING STATION <br /> 1428 E MARKET STREET <br /> STOCKTON CA 95205-5531 <br /> RE: 101 S. Wilson Way <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (EHD) has reviewed Interim Remediation Work Plan — May 2003 (WP), dated <br /> 21 May 2003, prepared on your behalf by Advanced GeoEnvironmental, Inc. <br /> (AGE) for the above referenced site. <br /> AGE proposes in the WP to install two ground water extraction wells, install <br /> piping runs and utility lines, and to initiate interim remediation of ground water <br /> through ground water extraction (GWE) and interim remediation of impacted soil <br /> through soil vapor extraction (SVE). Extracted ground water will be treated <br /> utilizing granulated activated charcoal and MTBE-hydroscopic synthesized filter <br /> media (Sunsolve) prior to disposal via the City of Stockton sanitary sewer <br /> system. Hydrocarbons and fuel oxygenates in extracted soil gas will be <br /> destructed utilizing a catalytic oxidizer. <br /> The depth to ground water on the site has recently been approximately 40 feet <br /> below surface grade (bsg), up from the approximately 60 feet bsg in 1995. <br /> Ground water has migrated consistently toward the northeast. Ground water is <br /> impacted by fuel hydrocarbons and additives, such as total petroleum <br /> hydrocarbons as gasoline (TPH-g), benzene, toluene, ethylbenzene, and xylenes <br /> (BETX), methyl tert-butyl ether (MTBE), tert-butanol alcohol (TBA), <br /> 1,2-dichloroethane (1,2-DCA), and other compounds. Dissolved contaminant <br /> concentrations encountered in shallow to intermediate depth ground water (40 to <br /> 63 feet bsg) have been as great as 300,000 micrograms per liter (µg/I) TPH-g, <br /> 50,000 µg/I benzene, 440,000 1.19/1 MTBE, and 520 µg/I 1,2-DCA. Ground water <br /> as deep as 125 to 135 feet bsg has been encountered with contaminant <br /> concentrations as great as 1,200 µg/I TPH-g and 210 µg/I benzene. The lateral <br /> extent of impacted ground water has not been fully delineated, but impacted <br /> ground water is suspected to have migrated eastward and to be impacting 102 S. <br /> Wilson Way across the street. <br /> AGE proposes to install two ground water extraction wells along the eastern <br /> margin of the site with screened intervals from 30 to 55 feet bsg, addressing <br />