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HYRRIP 2 39 �icr Si}uart llrnt Suite 2 <br /> EPWIR40NMEJUAL Mamie ahforma 9450l <br /> FIN L®GIES,INC. <br /> Tel s 10 52 i 5078 <br /> { 800 34'I{I (I <br /> cn <br /> C onnc �ut� Georgia � II{inoi5 <br /> Ma%5Uhuwrrs 4 'BCW Jtrsey e tifW Nork <br /> APR 0 9 2004 <br /> ENVIRONMENT HEALTH <br /> April 7, 2004 PERMIT/SERVICES <br /> Mr P E Copple <br /> Superintendent <br /> Central California Traction Company <br /> 2201 West Washington Street#12 <br /> Stockton, CA 95203-2942 <br /> RE: Work Plan for a Phase II Contaminant Delineation Investigation <br /> 1645 Cherokee Lane <br /> Stockton, CA <br /> Dear Mr Copple <br /> Hydro-Environmental Technologies, Inc (HETI) has been requested by the San Joaquin County Public <br /> Health Services, Environmental Health Division (PHS/EHD), to conduct an additional investigation to <br /> determine the extent of soil and ground water contamination in the area of the former tank excavation at <br /> the subject site The following work plan is for a Phase I1 Contaminant Delineation Investigation <br /> SITE HISTORY REVIEW <br /> Site Location and Background <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-industrial and <br /> commercial buildings, it is part of a property used by the Central California Traction Company to repair <br /> railroad engines 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 ethylhenzene and 1 800 mg/kg total xylenes benzene was below method detection <br /> limits <br /> HETI reviewed the September 1999 URS Greiner Woodward Clyde (URSGWC) final report UST <br /> Investigation, 1645 Cherokee Lane, Stockton, CA In August 1999, URSGWC conducted a soil <br /> boring/ground water investigation Five borings were drilled using direct push (DP) and hollow stem <br /> auger The highest TPH as diesel concentrations (at 22,000 mg/kg) in soil were detected in samples <br /> collected from boring B-1 at the 10-foot depth interval However, TPH as diesel was detected in soil <br /> samples collected from the entire soil boring to ground water Concentrations ranged from 6,000 mg/kg <br /> (at 15-feet bsg) to 2,000 mg/kg (at 40-feet bsg) Ethylbenzene and total xylenes were also detected <br /> ranging to 0 011 mg/kg and 0 061 mg/kg, respectively, at 10 feet bsg <br /> • <br />