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C A M B R I A 0 130 parts per million (ppm) xylenes and 1 630 ppm methyl tertiary butyl ether (MTBE) These results are discussed in Cambria's December 27, 2000 Soil Sampling Report 2001 Soil Borings- During October 2001, Cambria advanced two cone penetration test (CPT) borings (SB-1 and SB-2) near the northwestern dispenser Soil samples collected from SB-1 contained MTBE at concentrations ranging from 0 50 to 4 6 ppm at depths from 25 to 60 fbg MTBE was not detected in soil from SB-2, and no total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), or fuel oxygenates other than MTBE were detected in soil from either boring One groundwater sample was collected from boring SB-1, and it contained 48,000 parts per billion (ppb) MTBE and 220 ppb tertiary amyl methyl ether (TAME) No TPHg, BTEX, or fuel oxygenates other than MTBE or TAME were detected in the groundwater sample Cambria's December 4, 2001 Site Investigation Report summarizes results of this investigation 2002 Well Installation During September 2002, Cambria drilled five onsite groundwater monitoring wells (MW-2 through MW-6) TPHg, BTEX, and fuel oxygenates were not detected in soil from the well bormgs TPHg and BTEX were not detected in groundwater samples from . the wells MTBE and TAME were detected in the initial groundwater samples collected from wells MW-2 and MW-3 at concentrations up to 7,200 and 25 ppb, respectively No other fuel oxygenates were detected in groundwater from the wells Cambria's November 15, 2002 Site Investigation/Third Quarter 2002 Groundwater Monitoring Report describes these activities 2002 Receptor Survey Cambria conducted a receptor survey that included record searches and a door-to-door survey The receptor survey indicates that there are approximately 24 domestic and/or irrigation wells located within 1,100 feet of the subject site Groundwater flow direction data from the third quarter 2002 indicates that the wells are up-gradient of the site Therefore it is unlikely that any of the wells would be impacted by fuel oxygenates originating on the subject site The receptor survey is also included in Cambria's November 15, 2002 Site Investigation/Third Quarter 2002 Groundwater Monitoring Report Based on the groundwater analytical results from the September 2002 well installation, SJCEHD requested further investigation of the extent of fuel oxygenates in soil and groundwater beneath the site Cambria submitted the requested work plan on February 20, 2003, and the investigation results are presented below F� 0953 z h i