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i Quarterly Monitoring Report October 1998 Canepa's Car Wash(Pacific Avenue) November 17, 1998 Page -2 hydrocarbons quantified as gasoline (TPH-G), and methyl tertiary-butyl ether (MTBE) are present in the former location of the fuel dispenser islands I Prior to granting approval of installation of a new SVE system, the Underground Storage Tank Clean-Up Fund indicated the need for additional investigation Subsequently, Condor 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 mode The results Indicated 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 Report—Sod Iand Groundwater Investigation, dated June 12, 1998 A detailed Site History is Included in Appendix B 3 0 QUARTERLY GROUNDWATER MONITORING- OCTOBER, 1998 On October 22 and 23, 1998, 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) In addition, at the request of Mr Rowe of the PHS/EHD, a groundwater sample was also collected from soil vapor extraction well SV-7 The sampling order was as follows MW-5, MW-4, MW-8, MW-7, MW-6, MW-3, MW-2, SV-7, and MW-1 I 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 It should be noted that the surface of the groundwater table was above the top of the well screens Moderate petroleum hydrocarbon odors were I noted in the groundwater samples collected from MW-I and SV-7, and a slight odor was noted in 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-1 was purged with an electric submersible pump At least 3 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 Eac n ilo-v ,i t� t„ .,t I�,tet 11 of its pre-purge 11/ater level before sarilplina 1 - L41.11 yV 4l4 VY as all V VY eU 1V recover LV [46 1-t- Q V/V groundwater samples were collected directly from disposable bailers by transferring the groundwater to two 40-m1 glass vials The sample containers were labeled, placed in a cooler chilled with ice, and delivered, in accordance with cham-of=custody procedures, to GeoAnalytical Laboratories, Inc , In Modesto, California, on the day of collection I P-� CONDOR