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4 !, <br /> Fourth Quarter,2002 Quarterly Groundwater Monitoring Report <br /> Canepa's Car Wash,Pacific Avenue,Stockton,CA <br /> Page 4 <br /> SOIL VAPOR EXTRACTION SYSTEM <br /> . Regular maintenance of the trailer mounted Soil Vapor Extraction (SVE) system, which included belt <br /> replacement, was conducted on September 4, 2002. The weekly PID reading of the SVE system effluent <br /> indicated breakthrough on September 20, 2002 at 2 parts per million by volume. The system was shut <br /> down on September 23, 2002 and change-out of the carbon system was conducted on September 30, <br /> 2002. <br /> Quarterly soil vapor sampling from the influent, mid tank and effluent sample ports was conducted on <br /> September 30, 2002. The soil vapor samples were submitted for laboratory analysis of BTEX constituents <br /> and MTBE. During the September SVE sampling event, the mid tank soil vapor sample indicated <br /> concentrations of BTEX constituents and MTBE below the laboratory reporting limit, and therefore the <br /> destruction efficiency of the SVE system was estimated at 100%. Analytical results of the vapor samples <br /> are included in Table 3, below and in Attachment C. <br /> Laboratory certificates of analyses and chain of custody record are included in Attachment E. <br /> Table 3 <br /> SVE System Vapor Sample Laboratory Analytical Results(September 30, 2002) <br /> Date Sample ID benzene toluene ethyl benzene xylenes MTBE TPH-G PID(ppm) <br /> 9/30/2002 1707B-influent-9130102 5.1 7.0 6.8 0.7 X5.0 NA 43 <br /> 9/30/2002 1707B-midtanks-9/30/02 <0.15 a0.15 X0.15 ¢0.25 <1.5 NA 2 <br /> 9/30/2002 1707$-effluent-9130/02 <0.15 X0.15 <0.15 X0.25 <1.5 NA 0 <br /> Note:Air matrix units are reported as ppm (µL/L). <br /> PID=Photoionization detector. <br /> NA=Not analyzed. <br /> ppm=Parts per million. <br /> FUTURE WORK/RECOMMENDATIONS <br /> The SJCEHD has indicated that quarterly groundwater monitoring continue at the site. In a letter dated <br /> July 30, 2002, Condor requested temporary shut-down of the SVE unit based on data that indicates <br /> dwindling influent concentrations and to allow its relocation as part of the additional development of the <br /> site planned by the property owner. The SJCEHD and Condor have agreed, however, that the SVE unit <br /> will be operated until development is imminent. Condor is currently preparing a Problem Assessment <br /> Report (PAR) and a Corrective Action Plan (CAP) for the site to be submitted under separate cover. <br /> Following submittal of the PAR and CAP and approval of a comprehensive remedial approach for the <br /> site, the SVE unit is expected to be restarted. The next quarterly groundwater monitoring event is <br /> scheduled for January 2003. <br /> 's <br /> R <br /> �� CONDOR <br />