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ENVIRONMENTAL HEALTH DEPARTMENT <br /> oP SAN JOAQUIN COUNTY <br /> 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 /> • �q a�P • Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 0 ii 6W Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> MAY 0 7 2002 <br /> ANDY EGGIMAN <br /> C/O ROBERT EGGIMAN <br /> PO BOX 580 <br /> MOUNTAIN RANCH CA 95246 <br /> Re: Eggimans Hydraulic Site Code: 1914 <br /> 1112 E. Harding Way <br /> Stockton, CA 95205 <br /> San Joaquin County Environmental Health Division(EHD)has reviewed Summary <br /> Report of Additional Subsurface Investigation(report), dated March 31, 2002,prepared <br /> by ATC Associates, for the above referenced site. Soil and groundwater samples <br /> collected at the site evidenced hydrocarbon fuel contamination. Further site investigation <br /> to determine the vertical and lateral extent of groundwater contamination and the lateral <br /> extent of soil contamination is necessary. <br /> The report details investigative site work that took place on November 15 and 16, 2001, <br /> when three borings were advanced at this site. The three borings were subsequently <br /> completed as groundwater monitoring wells (MW1 through MW3) and developed and <br /> sampled on November 27, 2001. Analytical results from the soil samples indicated the <br /> soil sample taken from MW2 at a depth of 35.5 feet bgs contained the highest <br /> concentration of total petroleum hydrocarbon as gasoline 1,500 mg/kg(TPHg), 12 mg/kg <br /> ethyl benzene, and 37 mg/kg xylenes. This may represent contamination spread along a <br /> capillary fringe zone and should be confirmed with additional lateral assessment. <br /> Groundwater collected from MW1,MW2, and MW3 contained detectable concentrations <br /> of TPHg and BTEX. MW2 had the highest concentrations 2,000 µg/1 TPHg, 4.9 µg/1 <br /> benzene, 2.2 µg/1 toluene, 16 µg/1 ethylbenzene, 62 µg/1 xylenes, and 90 µg/1 t-butanol <br /> (TBA). MW3 had the highest concentrations of methyl-tert-butyl ether(MTBE) 160 <br /> µg/1 and 1,2-dichloroethane (1,2-DCA) 99 µg/1. Neither the vertical nor the lateral extent <br /> of impacted ground water has been delineated. <br /> MTBE groundwater plumes can be long,narrow, and erratic (meandering). Because of <br /> the migratory nature of MTBE and the potential for pumping influence from wells <br /> located near this site,it is particularly important to determine the vertical and lateral <br /> extent of this contaminant in the groundwater. <br />