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Quarterly Monitoring Report July 1999 Canepa s Car Wash(Pacific Avenue) August 20 1999 Page -2 Prior to granting approval of installation of a new SVE system, the Underground Storage Tank Clean-Up Fund indicated the need fot 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 Stmulprobe sampling device in soil vapor collection mode The results indicate high levels of volatile organtc 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 Report—Soil and Groundwater Investigation, dated June 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 -JULY 1999 On July 26 and 27, 1999, a Condor representative performed field observations and collected groundwater samples from the eight nnonitor wells at the site (see Figure 2, Appendix A, for well locations) The sampling order was as follows MW-8, MW-5, MW-4, MW-1, MW-7, MW-6, MW-3, and MW-2 3 1 GROUNDWATER MONITORING OBSERVATIONS AND PARAMETERS The static water level in cacti 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 A moderate petroleum hydrocarbon odor was noted in the groundwater sample collected from MW-1 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 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 in Appendix B) The purged water from each well was placed in a plastic, 55-gallon drum and left on site pending analytical results I 3 2 GROUNDWATER SAMPLING The groundwater samples were collected directly from the bailers by transferring the groundwater to two 40-nil glass vials The sample containers were labeled, placed in a cooler chilled with ice, and delivered, in accordance with chain-of-custody procedures, to GeoAnalytical Laboratories, Inc , in Modesto, California, within approximately 24 hours of sample collection 4 0 GROUNDWATER MONITORING RESULTS 41 GROUNDWATER ELEVATION CONTOURS On July 26, 1999, the dt,pth to groundwater was nncasuied in each monitor well prior to the collection of groundwater samples I he average depth to groundwater was approximately 33 7 feet below he well L� CONDOR