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ANALYTICAL METHODS AND RESULT'S <br /> ' Laboratory Analyses <br /> Groundwater samples were delivered to Creek Environmental Laboratories, Inc , a Caltrans-approved <br /> ' and California-certified analytical laboratory, for the analyses of TPHg and TPHd following EPA Test <br /> Method 8015, BTEX following EPA Test Method 8020 and fuel oxygenate compounds (FOCs) <br /> including MTBE, tert-amyl methyl ether (TAME), ethyl tert-butyl ether (ETBE), di-isopropyl ether <br /> ' WIPE) and tent-butanol (TBA) following EPA Test Method 8260 Groundwater analytical results are <br /> summarized on Table 1 Laboratory reports and chain-of-custody documentation arc presented in <br /> Appendix C <br /> The laboratory is currently preparing electronic data files for submittal to Geotracker Geocon will <br /> upload the data and provide Caltrans with a Geotracker confirmation number as soon as the process is <br /> complete <br /> Groundwater Analytical Results <br /> TPHg was detected in samples collected from wells MW-2, VW-1 and VW-2 at concentrations of <br /> 1,900, 91 and 9,800 pg/l, respectively TPHd was detected in the groundwater samples collected from <br /> wells MW-2 and VW-2 at respective concentrations of 380 and 2,800 pg/l Benzene was detected in <br /> groundwater samples collected from wells MW-2 and VW-2 at concentrations of 220 and 2,300 µg/l, <br /> respectively Toluene, ethylbenzene and total xylenes were also detected in the samples collected from <br /> wells MW-2 and VW-2 at concentrations ranging from 8 6 µg/1 (toluene - VW-2) to 750 gg/l <br /> (ethylbenzene - VW-2) MTBE was detected in one sample, VW-2, at 96 µg11 TAME, D1PE, TBA and <br /> ETBE were not detected above their respective laboratory method detection limits in each of the <br /> groundwater samples collected TPHg, TPHd, benzene, and MTBE concentrations for the First Quarter <br /> - 2004 monitoring event are depicted on Figure 3, Petroleum Hydrocarbons in Groundwater - March <br /> 2004 <br />' CONCLUSIONS <br /> The highest concentrations of dissolved phase petroleum hydrocarbons appear to be limited to the <br />' immediate vicinity of the former UST excavation area (monitoring wells MW-2 and VW-2) It is <br /> understood that Caltrans has scheduled remediation activities at the Site The next quarterly <br /> monitoring event is scheduled for the last week of May 2004 <br /> i <br /> Project No 58475-06-24J -3- April 22,2004 <br />