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Quarterly Monitoring Report April 2001 Canepa's Car Wash(Pacific Avenue) gasoline (TPH-G), and methyl tertiary-butyl ether(MTBE) are present to the vicintty of the former location Iof the fuel dispenser islands Pilo[ to granting approval of installation of the new SVE system, the Underground Storage Tank Glean-Up I 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 mode The results indicated high concentrations 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 — Sial and Groundwater Investigation, dated June 12, 1998 Operation of the SVE system continued since its initiation on March 15, 1999 until it was shut down on January 24, 2001 pending further evaluation, because of efficiency less than required by the operating permit I 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 were discontinued beginning 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 Eresults Commencing with the October 1999 quarterly groundwater monitoring event, laboratory analyses of groundwater samples for gasoline oxygenates/additives are limited to MTBE using EPA Method 8020 or 8021 B 3.0 QUARTERLY GROUNDWATER MONITORING —APRIL 20011 I • On April 10 and 11 2001 a Condor representative 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- 1, MW-3, MW-2, MW-7, MW-5, MW-4, MW-6, and MW-8 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 toi floating product, petroleum odors, and sheen No floating product or sheen was 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 The following olfactory observations were made + A strong petroleum hydrocat bon odor was detected in the groundwater safnples collected from MW- 2 • A moderate petroleum hydrocarbon odor was detected In the groundwater sample collected from MW-4 + Petroleum hydrocarbon odors were not noted in any of the other groundwater samples All of the monitor wells were purged with a Grundfos Redi-Flo 11 submersible pump, which was decontaminated prior to use Appioximately three well casing volumes of water were purged from each well (see the Groundwater Monitoring P geld 1 orms in Appendix 13) rhe purged water from each weli was discharged to the wastewater mixing pit 3 2 GROUNDWATER SAMPLING . The groundwater samples were collected by filling three 40-milliliter glass vials with groundwater directly fioin the pump discharge tubing at a reduced rate The sample containers were labeled, placed in CONDOR