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• CAMB R1A <br /> r <br /> concentrations up to 0 13 ppm Petroleum hydrocarbons were not detected in groundwater <br /> samples collected from wells MW-1 through MW-3 Summary tables of the chemical <br /> analytical results, a site map, cross-sections, and well logs from this investigation report are <br /> included in Appendix B <br /> Based on the analytical data collected during these investigations, hydrocarbon impacted soil <br /> was delineated and limited to the vicinity of the former UST pit and groundwater beneath the <br /> site had not been impacted with petroleum hydrocarbons <br /> 1992 Hydrogeologic Assessment Results and Quarterly Groundwater Monitoring Report. <br /> During December 1991, one additional groundwater monitoring well (MW-4) was installed <br /> Three soil samples from the boring for MW-4 were submitted for laboratory chemical <br /> analyses TPHg was detected in the sample collected from 29 fbg at a concentration of I 1 <br /> ppm BTEX compounds were not detected in any of the soil samples collected from well <br /> MW-4 A summary table of the chemical analytical results, a site map, and the well log from <br /> this investigation report are included in Appendix B <br /> 1992 Results Report for Air Monitoring of Extended Pilot Vapor Extraction Test. Petroleum <br /> hydrocarbons were removed from soil beneath the former UST pat during a soil vapor <br /> extraction pilot test performed at the site from December 1991 to February 1992 Air <br /> monitoring data indicated petroleum hydrocarbons at concentrations of up to 6,500 parts- <br /> per-million-volume (ppmv) were removed from soil during the test Groundwater samples <br /> collected from MW-4 following vapor extraction contained very low concentrations of <br /> petroleum hydrocarbons when detected <br /> 1996 Case Closure Summary: During July 1996, Enviros Inc (Enviros), of Sonoma, <br /> California prepared a Case Closure Summary for the subject property. The report included a <br /> data summary, subsurface characterization, a soil sampling summary, a groundwater <br /> monitoring and sampling summary, conclusions, and recommendations In this report, based <br /> on six years of continuous quarterly groundwater monitoring with low to non detectable <br /> concentrations of petroleum hydrocarbons, Enviros requested case closure be granted for the <br /> site <br /> 1998 Upgrade Site Inspection Report: In July 1998, the service station was upgraded <br /> During the upgrade activities, waste oil overspill containment was installed Cambria <br /> inspected native soil exposed in the work areas for evidence of petroleum hydrocarbons <br /> iPetroleum hydrocarbons were not detected during these inspections Soil sampling was not <br /> required by SJCPHS and no soil samples were collected for chemical analysis <br /> 0837 5 <br />