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i Quarterly Monitoring Report April 2000 Canepa s Car Wash(Pacific Avenue) ' Page -2 Condor has conducted quarterly groundwater monitoring activities at the site since August 1996 Analyses of groundwater samples collected from the SVE wells (SVE-1 through 9) indicate that high concentrations of benzene, toluene, ethyl benzene, and total xylenes (BTEX), total petroleum hydrocarbons quantified as gasoline (TPH-G), and methyl tertiary-butyl ether (MTBE) were present at the former location of the fuel dispenser Islands Prioi 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 soli 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 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 — Sod and Groundwaler Investigation, dated .lune 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 8260 was discontinued fbeginning with the October 1999 quarterly 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 8020 3.0 QUARTERLY GROUNDWATER MONITORING —APRIL 2000 On April 11, 12, and 13, 2000 a Condor representative performed field observations and collected groundwater samples from the eight monitor wells and one soil vapor extraction well at the site (see I Figure 3, Appendix A, for well locations) The sampling order was as follows MW-8, MW-5, MW-1, MW-7, MW-6, MW-4, MW-2, SV-9, and MW-3 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 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 I samples collected from MW-1 A moderate petroleum hydrocarbon odor was detected in the groundwater sample collected from MW-2 and SV-9 Petroleum hydrocarbon odors were not noted in any of the other groundwater samples SV-9 and all of the monitor wells except MW-1 were purged using new, disposable bailers Monitor well MW-1 was purged with a Redi-Flow submersible pump that was decontaminated prior to use i i lI F ,.- .i I om each ivell fcPP tha f;rnoinriluntPr App1UX11I1dLGly tll]GG WGIiI casing vvlu�i��S v� vras�w mere purgeu 1.,.... Monitoring Field Forms in Appendix B) The purged water from each well was discharged to the washwater mixing pit - I Z� CONDOR