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These data show relatively moderate levels of MTBE, BTEX and gasoline contariunation in the <br /> groundwater samples from MW-2 and all bore holes except B-1 None of the groundwater <br /> r samples showed contamination from oil However, since the sampling in 1997, oil has reached <br /> groundwater in MW-2 as evidenced by significant floating oil present in September 1998, <br />• December 1999, January 2000, April 2000 and November 2000 Since that time floating oil has <br /> r <br />. been removed and reduced significantly <br />. Table 9. Sierra Pacific Groundwater Sample Results from Report of Investigation Dated 4 February 1997. <br /> Sample ID MTBE2 Benzene2 Toluene Eth lbenzenC2 X lenes2 THP- l TOG' <br />. B-1 NA NA NA NA NA NA NA <br /> B-2 (MW-2) 159 0.0094 ND 00003 00013 0.361 ND <br />. B-3 0 925 0.273 00015 0.0008 0.0035 0.359 NA <br />. B-4 158 00015 ND ND ND 0 157__L_ NA <br /> r Notes All results shown 1n ppm <br />. 'Detection limits for analyses on this sample were 0 05 ppm <br /> Detection limits for analyses on this sample were 0 0005 ppm <br /> 3Detection limits for analyses on this sample were 1 ppm <br />. ND=Not detected at or above the indicated laboratory detection limit <br /> NA= Sample was not analyzed <br /> All groundwater samples extracted by EI were analyzed for total petroleum hydrocarbons as <br />. diesel, oil and gasoline (TPHg, TPHd and TPHo) by EPA Method 8015 These groundwater <br /> samples were also analyzed for benzene, toluene, ethyl benzene and total xylenes (BTEX) by <br /> EPA Method 8020, and Methyl tert-Butyl Ether (MTBE)/oxygenates [di-isopropyl ether (DIPE), <br /> r ethyl-t-butyl ether (ETBE), tert-amyl methyl ether (TAME), t-butanol (TBA)] by EPA Method <br /> r 8260 <br /> r <br /> r 4.5 Groundwater Elevations <br /> r Table 10 Groundwater Elevations <br /> r <br /> r 22-Dec-99 27-Jan-00 20-A r-00 <br /> Casing 26-,tui-00 <br /> Sample Elevation Depth to Elevation Depth to Elevation Depth to Elevation Depth to Elevation <br /> riDMSL) Water SL Water SL Water SL Water MSL <br /> MW-1 1302 29 92' 16 90' 28 70' -1568 2562 -12 60' 2900 -14 98' <br /> MW-2 1342 NA NA NA NA 25 99' -12 57' 28 25' 14 83' <br /> MW-3 1284 30 40' -17 S6' 28 60' -1576' 25 55' -12 71' 2790 -1506' <br /> MW-4 1235 NA NA NA NA NA NA NA NA <br /> Elevations are shown graphically in Figure 9 <br /> Environeenng,Inc Project No 00-01108 14 <br /> r <br />