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S E c o R Conceptual Site Model Chevron Service Station#9-6171 March 25, 2005 I Page 7 8020, 8240, 624, 8260, 908, 910, 7520, 7130, 7190, 7420, and 7950 Analysis of soil samples collected from the WOT-1 excavation pit indicated that petroleum hydrocarbons and fuel oxygenate Impacts to soil extended no deeper than 17 5 feet bgs The WOT-1 soil samples contained concentrations of TPHg at 110 ppm, total petroleum hydrocarbons as diesel (TPHd) at 4,900 ppm, total petroleum hydrocarbons as oil (TPHo) at 7,400 ppm, and total BTEX at 8 4 ppm The presence of chlorinated solvents were limited to 2 2 ppm of cis- 1,2-dichloroethene (cis-1,2-DCE) and 1 5 ppm tetrachloroethene (PCE) Analysis of soil samples collected from the WOT-2 excavation pit contained no detectable concentrations of waste oil constituents Additionally, no other waste oil tank constituents analyzed, such as chromium, cadmium, lead, nickel, and zinc (CAM 5 Metals) or polychlorinated biphenols (PCBs), were detected from either excavation pit Installation of Monitoring Well OW— 1 No information is available on the Installation of monitoring well OW-1 OW-1 was sampled quarterly starting April 23, 1998 It is assumed that OW-1 was installed between September 1995 and September 1997 Installation of Groundwater Extraction Wells - '1998 In June 1998, Levine-Fricke-Recon Inc (LFR), on behalf of Lincoln Properties Ltd , Installed two groundwater extraction wells (GEW-007A and GEW-008A) and associated piping In the planters on the west side of the Chevron property These GEW are part of a larger groundwater extraction and treatment system installed to treat chlorinated hydrocarbons In groundwater associated with past dry-cleaning activities at the Lincoln Village Shopping Center (LVSC) The onsite extraction wells are connected to the overall system via conveyance piping IGroundwater Monitoring Well Installation —2001 I In March and June 2001, SECOR contracted and supervised Gregg Drilling and Testing, Inc (GDT) to drill and Install three shallow on-site groundwater monitoring wells (MW-8 through MW-10), one deep on-site groundwater monitoring well (MW-11D) and three shallow off-site groundwater monitoring wells (MW-12 through MW-14) The concentrations of TPHg for all soil samples submitted for chemical analysis by EPA Method 8260B were below the method detection limits Total xylenes were reported in the sod sample collected from boring MWA 1 D at 84 feet bgs at a concentration of 0 018 milligram per kilogram (mg/kg) No other BTEX components were reported in the soil samples submitted for chemical analysis by EPA Method 8260B Methyl tert-butyl ether (MtBE) was detected in the soil sample collected at 38 5 feet bgs from boring MW-8 at a concentration of 0 065 mg/kg This soil sample was collected from beneath the static groundwater level and therefore, the detection of MtBE might reflect MtBE concentrations in groundwater rather N IFdeslProjects\Chevron\Retadl#9-617115ite conceptual ModeRFINAL_CSM doo