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r Earth Systems Environmental , Inc. <br /> U A Member of The Earth Systems Group <br /> 6701 McDivitt Drive, Suite B • Bakersfield CA 93313 • (805) 836-0901 • FAX (805) 836-0911 <br /> May 6, 1992 Doc No 9204 -E044 PRP <br /> Project No EB-8101-2 <br /> Mr Steven Schneider <br /> ' San Joaquin County Department of <br /> Environmental Health Services <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> ' SUBJECT PRELIMINARY SITE CHARACTERIZATION <br /> MORITA BROTHERS SERVICE STATION <br /> 314 EAST CHARTER WAY <br /> STOCKTON,CALIFORNIA <br /> APN # 167-181-01 <br /> ' Reference Soil Characterization Work Plan, Morita Brothers Service Station <br /> ESE, March 7, 1992 <br />' Reference Tank Closure Report, Morita Brothers Service Station <br /> ESE, January 23, 1992 <br /> 1 .0 INTRODUCTION <br /> This report presents the results of a preliminary site characterization performed by <br /> Earth Systems Environmental, Inc (ESE) at the above referenced site The purpose of <br />' athe characterization was to assess the lateral and vertical extent of soil impacted by <br /> both gasoline hydrocarbons associated with a release from the former 5,000 gallon <br />' underground unleaded gasoline storage tank, as well as the product pipeline <br /> associated with the northern gasoline dispenser recently removed under San Joaquin <br />' County Permit Number I061 from the above referenced facility Total Purgeable <br /> Hydrocarbons (TPH) as gasoline were detected during the tank removal at 2,250 <br /> mg/kg at a depth of 12 feet below surface grade beneath the south end of the former <br /> tank, and at 980 mg/kg at 12 feet below surface grade beneath the north end of the <br /> former tank TPH as gasoline was detected at 50 0 mglkg at a depth of 3 feet below <br />' surface grade beneath the product pipelines associated with the northern gasoline <br /> dispensers The fuel constituent volatile aromatics benzene, toluene, ethylbenzene, <br />' and total xylenes were also detected at concentrations in excess of Regional Water <br /> Quality Control Board (RWQCB) guidelines in samples from Beneath the former tank <br /> and product pipelines, and resulted in the Lead Implementing Agency (LIA) which is <br /> the San Joaquin County Department of Environmental Health Services requesting an <br /> initial site characterization ESE subsequently conducted a site characterization on <br /> I <br />