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TPH-Diesel was present in both groundwater samples at concentrations of 3I0 ppm and 110 ppm Ethylbenzene and xylenes were also found in MW-1, which is located at the former UST diesel location Table 3. Groundwater Sample Results Sample TPH- TPH- Motor z z x Ethyl Total ID Gasoline' Diesel' 01183 MTBE Benzene Toluene Benzene2 Xylenes2 MW-1 ND 310 ND ND ND ND 0.0025 0.004 MW-3 ND 110 ND ND ND ND ND ND Nates Results are reported in ppm 'Detection limits for analyses on this sample were 0 05 ppm 2Detecuon limits for analyses on this sample were 0 0005 ppm 3Detection limits for analyses on this sample were 1 ppm °Detection limits for analyses on this sample were 0 5 ppm ND=Not detected at or above the indicated laboratory detection limit Again, the following table from the Sierra Pacific report completed in 1997 is included here to provide information regarding the extent of contamination at the site These data show relativelymoderate levels of MTBE BTEX n 1 and gasoline contamination ' in groundwater samples from MW-2 and all bore holes Some of the groundwater samples showed contamination from oil However, since this sampling in 1997, oil has reached groundwater in MW-2 as evidenced by signification floating oil present in September 1998 and at the time the current field work was completed (December 1999 and January 2000) Table 4. Sierra Pacific Groundwater Sample Results from Report of Investigation Dated 4 February 1997. i Sample ED MTBE3 Benzene3 Toluene Eth lbenzenez X lenes2 THP-g' TOG' B-1 NA NA NA NA NA NA NA B-2 1.59 0.0094 ND 00003 0.0013 0.361 ND B-3 0.925 0 273 0.0015 1 0.0008 1 0.0035 0 359 NA 1-4 1.58 0.0015 ND ND ND 0.157 NA Notes Results are sported in ppm 'Detection limits for analyses on this sample were 0 05 ppm Emrironeering,Inc. Project No 99-01202 10