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C A M B R I A <br /> During February 1996, Enviros, Inc. (Enviros) drilled ten soil borings in the vicinity of the UST <br /> complex and the dispenser islands. TPHg was detected in three of the borings at concentrations <br /> up to 770 ppm. Benzene was detected in one boring at concentrations ranging from 0.0082 to <br /> 0.026 ppm. Methyl tertiary butyl ether (MTBE) was detected in four of the borings at <br /> concentrations up to 15 ppm. This investigation is detailed in Enviros' May 21, 1996 Soil Boring <br /> Installation Report. <br /> During September 1999, Cambria installed one groundwater monitoring well (MW-1). Soil <br /> samples from well boring MW-1 contained 0.0208 ppm MTBE. No TPHg, benzene, toluene, <br /> ethylbenzene, xylenes (BTEX), fuel oxygenates other then MTBE, or lead scavengers were <br /> detected in soil from this boring. During the initial groundwater sampling event, well MW-1 <br /> contained 75.8 parts per billion (ppb) TPHg and 21.1 ppb MTBE. No BTEX, fuel oxygenates <br /> other then MTBE, or lead scavengers were detected in groundwater from this well. This <br /> investigation is further described in Cambria's December 21, 1999 Site Investigation/Fourth <br /> Quarter 1999 Groundwater Monitoring Report. <br /> During March 30, 2001, the product piping was removed and replaced. Cambria collected eight <br /> soil samples beneath the piping. Six of the samples contained TPHg up to 220 ppm. Benzene <br /> was detected in three of the soil samples at concentrations up to 0.066 ppm. MTBE was detected <br /> (by EPA Method 8260B) in all soil samples at concentrations ranging from 0.015 to 0.42 ppm. <br /> TAME .and TBA were also detected in some of the soil samples at low concentrations. These <br /> activities are summarized in Cambria's August 1, 2001 Soil Sampling and Piping Removal <br /> Report. <br /> Monitoring well MW-1 has been sampled quarterly since October 1999. During the second <br /> quarter 2001 sampling event, 164 ppb MTBE was detected (by EPA Method 8260) in the well. <br /> No TPHg or BTEX were detected. <br /> Based on the quarterly groundwater monitoring results, SJCPHS/EHD requested submittal of this <br /> work plan. <br /> 1359 2 <br />