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rl i CAMBRIA site The findings of this investigation are documented in Cambria's December 13, 2002 Response Letter/Site Investigation and Third Quarter 2002 Groundwater Monitoring Report/Work Plan 2002 Aquifer Pump Test During October 2002, Cambria conducted a five-day groundwater extraction (GWE) test Data collected during the test suggest that interim remediation was effective Approximately 4,249 gallons of groundwater were extracted over the five-day period Based on the extracted volume and sample analytical results, interim remediation removed approximately 3 33 pounds of MTBE Groundwater Monitoring Program Prior to this investigation, there were seven monitoring wells located onsite (MW-1 through MW-7) and two piezometers (P-1 and P-2), which are sampled quarterly During the second quarter 2003 sampling event, MTBE was detected in wells MW-1 through MW-5, MW-7, P-1, and P-2 concentrations ranging from 1 8 to 280,000 ppb TBA was detected in wells MW-1 through MW-4, MW-7, P-1 and P-2 at concentrations ranging from 190 to 74,000 ppb No other fuel oxygenates were detected During the same event, TPHg and BTEX were also not detected, although some reporting limits were elevated INVESTIGATION RESULTS Personnel Present• Cambria geologist Curt Payne directed the field activities, working under the supervision of California Registered Geologist Joe Neely Permit Cambria obtained permit No 34463 from SJCEHD (Appendix A) Drilling Company Gregg Drilling and Testing, Inc (Gregg) of Martinez, California (C57 License No 485165) Drilling Dates September 16 through 18, 2003 Drilling Method Ten-inch hollow-stem augers Soil Sampling Methods Bonngs were logged using the Unified Soil Classification System and Munsell Soil Color Charts Soil samples were collected at five-foot intervals from the well borings for soil 0955 4