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Quarterly Monitoring Report October 1999 Canepa's Car Wash(Pacific Avenue) November 22 1999 Page -2 iPrior to granting approval of installation of the new SVE system, the Underground Storage Tank Clean-Up Fund indicated the need for additional investigation Condor subsequently conducted the installation and sampling of two soil borings adjacent to the SVE well array The investigation included soil vapor screening using a Simulprobe sampling device in soil vapor collection anode The results indicated high levels of volatile organic compounds were present in the soil vapor at the site The laboratory analytical results of the soil and groundwater samples collected during the investigation are presented in Report—Soil and Groundwater Investigation, dated June 12, 1998 Operation of the SVE system has continued since its initiation on March 15, 1999 Due to a directive from the Underground Storage Tank Cleanup Fund (USTCF), laboratory analyses of groundwater samples for gasoline oxygenates/additives by EPA Method beginning with the O uarterly groundwater monitoring event The USTCF indicated that analysis by EPA Method 8260 is not warranted based on historical groundwater laboratory analytical results Commencing with the October 1999 quarterly groundwater monitoring event, laboratory analyses of groundwater samples for gasoline oxygenates/additives is limited to MTBE using EPA Method 602 A detailed Site History is included in Appendix B 3.0 QUARTERLY GROUNDWATER MONITORING- OCTOBER 1999 On October 13 and 14, 1999, a Condor representative performed field observations and collected groundwater samples from the eight monitor wells at the site (see Figure 2, Appendix A, for well locations) The sampling order was as follows MW-4, MW-5, MW-6, MW-8, MW-7, MW-1, SV-3, MW-2, and MW-3 3.1 GROUNDWATER MONITORING OBSERVATIONS AND PARAMETERS The static water level in each well was measured to the nearest 0 01-foot with a battery-operated, flat tape, water-level meter A clean, single-use, polypropylene, disposable bailer was lowered into each well to check for floating product, petroleum odors, and sheen Floating product was not observed in any of the monitor wells during the groundwater sampling The surface of the groundwater table was above the top of the well screens, however A strong petroleum hydrocarbon odor was noted in the groundwater samples collected from MW-1 and MW-2 A moderate petroleum hydrocarbon odor was noted in the groundwater sample collected from SV-3 Petroleum hydrocarbon odors were not noted in the remaining groundwater samples All of the monitor wells except MW-1 and soil vapor extraction well SV-3 were purged using new, disposable bailers Monitor well MW-1 and SV-3 were purged with a Redi-Flow submersible pump that was decontaminated prior to use Approximately three well casing volumes of water were purged from each well (see the Groundwater Monitoring Field Forms i*i Appendix B) The purged water from each well was placed in a plastic, 55-gallon drum and left on site pending analytical results 3.2 GROUNDW ATER SAMPLING The groundwater samples obtained from monitor wells MW-2 through MW-8 were collected directly from the bailers by transferring the groundwater to two 40-milliliter glass vials The groundwater samples obtained from MW-1 and SV-3 were collected by filling two 40-milliliter glass vials ftk 1 �J CONDOR