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A M B R I A Mr Jeffrey Wong July 27, 2005 approximately 3 33 pounds of MTBE Cambria's December 13, 2002 Aquifer Pump Test Report summarizes the test activities 2003 Well Installation During July 2003, Cambria installed three off-site wells (MW-8, MW-9, and MW-10) and one deep on-stte well (MW-11) No TPHg, BTEX, or fuel oxygenates were detected in soil from well borings MW-8, MW-9, or MW-10,although the samples were analyzed outside of hold time Soil samples were not collected from well boring MW-11 because it is located near MW-1 These results complete lateral definition of petroleum hydrocarbons and fuel oxygenates in soil at this site Cambria's December 3, 2003 Site Investigation/Third Quarter Groundwater Monitoring Report and Site Conceptual Model describes this investigation 2003 SVE Test During September 2003, Cambria installed three SVE wells (SVE-1, SVE-2, and SVE-3) During October 2003, Cambna performed a 5-day SVE test using these wells During this test, approximately 2 68 pounds of TPHg and 142 pounds of MTBE were removed Due to low influent concentrations which indicate that there is insignificant impact to the source area, Cambria did not recommend additional SVE Cambria's November 14, 2003 Soil Vapor Extraction Test Report documents this test 2003 Interim GWE events During September, October, and December 2003, Cambria conducted . three batch GWE events During each event, Cambria extracted groundwater continuously from well MW-4 for 5 days During these events, approximately 19,850 gallons of groundwater were extracted, removing 8 04 pounds of MTBE Cambria's September 16, 2004 Interim Remediation Report/Work Plan/Response Letter presents the interim remediation results Groundwater Monitoring Program There are currently eight groundwater monitoring wells on site (MW-1 through MW-7 and MW-11), two piezometers (P-1 and P-2) on site, and three off- site groundwater monitoring wells (MW-8, MW-9, and MW-10), which are gauged and sampled quarterly Current depths to water in all wells and piezometers range from 49 to 51 feet below grade (fbg) During the second quarter 2005 sampling event, MTBE was detected in wells MW-1, MW-3, MW-4, MW-5, MW-7, P-1, and P-2 at concentrations ranging from 2 4 to 1,400 ppb The laboratory noted that the samples from wells MW-7 and P-1 were analyzed outside the EPA recommended hold time TBA was detected in wells MW-1 through MW-4, MW-7, P-1, and P-2 at concentrations ranging from 29 to 96,000 ppb The laboratory noted that the samples from wells MW-7 and P-1 were analyzed outside the EPA recommended hold time, and the result for P-1 (96,000 ppb) is an estimated value because the concentration exceeded the calibration of the analysis Well MW-7 also contained 2 4 ppb TAME, and piezometer P-1 contained 5 5 ppb ETBE and 2 6 ppb TAME Samples were not analyzed for TPHg and BTEX during this sampling event Samples from all wells are analyzed for TPHg and BTEX annually during the first quarter 4