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Site Conceptual Model <br /> Shell-branded Service Station <br /> 620 West Charter Way, Stockton, California <br /> _Site_=620=West Charter=Way=1hcident�No: 98996187 <br /> Address <br /> City: Stockton, California Regulator: San Joaquin County Environmental <br /> Health Department <br /> Item Evaluation Criteria Comments/Discussion <br /> 1 Hydrocarbon Source <br /> 1 1 Identify/Desenbe Release Source Several soil samples collected in the vicinity of the <br /> and Volume (if known) former underground storage tanks (USTs) and former <br /> dispenser area (current UST location) in 1989 <br /> contained petroleum hydrocarbons Historical soil <br /> data tables and maps are presented in Attachment 1 <br /> 1 2 Discuss Steps Taken to Stop The former USTs were removed in 1989 <br /> Release <br /> Z Site Characterization <br /> 2 1 Current Site Use/Status Active Shell-branded service station <br /> 22 Soil Definition Status Soil data were collected during investigations in 1989 <br /> (soil borings SB-1 through SB-8 and wells MW-1 <br /> through MW-4, MW-6, and MW-7), 1990 (wells <br /> MW-5, MW-8, and MW-9), and 1991 (well MW-10) <br /> Subsequent soilvapor extraction(SVE)from 1992 to- <br /> 1996 <br /> o1996 removed 17,628 pounds of hydrocarbons, <br /> diminishing the applicability of the pre-remediation <br /> soil data Post-remediation soil data were collected <br /> from borings CPT-1 through CPT-4 in March 2000 <br /> and CPT-5 in June 2002 The initial soil borings (SB -10 t%r ) <br /> series) and the monitoring wells were sampled to ;I <br /> depths up to 41 feet below grade (fbg) Subsequent k' k, <br /> soil borings (CPT series) were sampled to depths up M'P P P <br /> to 100 fbg - C� n�.vti CP'C�� Was f6mAb4l At j J 0' '<� �k <br /> 1 Inv <br /> The highest hydrocarbon concentrations were <br /> detected in shallow soil beneath both the former and <br /> current UST locations (Figure 3) These <br /> hydrocarbons were targeted by soil vapor extraction <br /> Hydrocarbons were detected in deeper soil during the <br /> CPT investigations, but the concentrations were <br /> lower than those detected in shallow soil and were <br /> not as widespread (171.7 4) •� <br /> �C <br /> 0778 1 <br /> i <br />