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EXECUTIVE SUMMARY <br /> The subject property is at 1645 Cherokee Lane, Stockton, California, north of the intersection of <br /> Cherokee Lane and Waterloo Road The subject property is in an area of mixed light-industnal and <br /> commercial buildings, it is part of a property used to repair railroad engines by the Central California <br /> Traction Company In January 1999, Thorpe Oil Company excavated and removed one 6,000-gallon <br /> gasoline underground storage tank (UST) and one 1,000-gallon diesel UST from the subject property <br /> One soil sample, collected from below the excavated diesel tank at 9 feet below surface grade (bsg), had <br />' 8,000 milligrams per kilogram (mg/kg) total petroleum hydrocarbons (TPH) as diesel, 0 33 mg/kg <br /> toluene, 0 740 mg/kg ethylbenzene, and 1,800 mg/kg total xylenes, benzene was below method detection <br /> limits <br />' Hydro-Environmental Technologies, Incorporated (HETI) reviewed the September 1999 URS Greiner <br /> Woodward Clyde (URSGWC) final report UST Investigation, 1645 Cherokee Lane, Stockton, CA In <br />' August 1999, URS Greiner Woodward Clyde (URSGWC) conducted a soil bonng/ground water <br /> investigation Five bonngs were drilled using direct push (DP) and hollow stem auger The highest TPH <br /> as diesel concentrations (at 22,000 mg/kg) in soil were detected in samples collected from boring B-I at <br />' the 10-foot depth interval However,TPH as diesel was detected to soil samples collected from the entire <br /> soil boring to ground water Concentrations ranged from 6,000 mg/kg (at 15-feet bsg) to 2,000 mg/kg (at <br /> 40-feet bsg) Ethylbenzene and total xylenes were also detected ranging to 0 011 mg/kg and 0 061 mg/kg, <br /> ' respectively at 10 feet bsg <br /> In their November 4, 1999 letter, the San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) requested a further investigation to determine the lateral and vertical extent of the <br /> petroleum contamination at the subject property On June 15, 2000, Ms Lon Duncan, Senior REHS with <br /> the PHS/EHD, approved the work plan prepared by HETI HETI then installed six DP borings <br /> throughout the subject property Grab ground water samples were obtained from each boring No <br /> ' detectable concentrations of TPH as gasoline, TPH as diesel, benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX), or the five fuel oxygenates were found in the 46 soil samples and six grab ground water <br /> samples submitted for analysis <br /> HETI then installed three ground water monitoring wells to sample ground water and to determine ground <br /> water flow direction and gradient On June 8, 2001, the PHS/EHD requested one additional ground water <br /> ' monitoring well in the area of the former diesel excavation On July 27, 2001, the PHS/EHD approved <br /> the well permit application form for the installation of one additional ground water monitoring well <br /> HETI recommends that the additional ground water monitoring well be included in the on-site quarterly <br /> ground water monitoring program <br /> 1 <br />