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Quarterly Monitoring Report April 1999 Canepa s Car Wash(Pacific Avenue) ' inlay 31 1999 Page -2 Prior to granting approval of Installation of a new SVE system the Underground Storage Tani. 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 Siinulprobe sampling device in soil vapor collection mode The results indicate high levels of volatile organic compounds are 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 Repoi t—Sol/ and Groundwater Investigation, dated .lune 12, 1998 Operation of the SVE system was initiated on March 15, 1999 A detailed Site History is included in Appendix B 3 0 QUARTERLY GROUNDWATER MONITORING-APRIL 1999 ' On April 20 and 21, 1999, a Condor representative performed field observations and collected or samples from the eight monitor wells at the site (see Figure 2, Appendix A, for well locations) In addition, at the request of Mr Rowe of the PHS/EHD, a groundwater sample was also ' collected from soil vapor extraction well SVE-6 The sampling order was as follows MW-8, MW-5, MW-4, MW-1, MW-2, MW-6, MW-7, MW-3, and SVE-6 3 1 GROUNDWATER MONITORING OBSERVATIONS AND PARAMETERS The static «ater 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 It should be noted that the surface of the groundwater table was above the top of the well screens Moderate petroleum hydrocarbon odors were noted in the groundwater samples collected from MW-1 and SVE-6 A slight petroleum hydrocarbon ' odor was noted in the groundwater sample collected from MW-2 Petroleum hydrocarbon odors were not noted in the remaining groundwater samples ' All of the monitor wells except MW-1 were purged using new, disposable bailers Monitor well MW-I was purged with a clean polyvinyl chloride (PVC) reusable bailer that was decontaminated prior to use Approximately three well casing volumes of water were purged from each well (see the Groundwater Monitoring Field Forms in 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 GROUNDWATER SAMPLING Each well was allowed to recover to at least 80% of its pre-purge water level before sampling The groundwater sainples were collected directly from the bailers by transferring the groundwater to two 40- mi glass vials The sample containers were labeled, placed in a cooler ch tiled with ice, and delivered, in accordance xvith chain-of-custody procedures, to GeoAnalytical Laboratories, Inc, in Modesto, California, on the days of collection k It� CONDOR