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ANALYTICAL METHODS AND RESULTS <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 />' (DIPE) and tert-butanol (TBA) following EPA Test Method 8260 Groundwater analytical results are <br /> summarized on Table 1 Laboratory reports and chain-of-custody documentation are 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 /> 3,830, 64 7 and 5,680 µg/1, respectively TPHd was detected in the groundwater samples collected <br /> from wells MW-2 and VW-2 at respective concentrations of 200 and 1,100 gg/l Benzene was detected <br /> in groundwater samples collected from wells MW-2 and VW-2 at concentrations of 683 and 1,900 <br /> µg/1, respectively Toluene, ethylbenzene and total xylenes were also detected in the samples collected <br /> from wells MW-2 and VW-2 at concentrations ranging from 18 9 }tg/1 (toluene - VW-2) to 864 µg/1 <br /> (total xylenes - MW-2) MTBE was detected in one sample, VW-2, at 59 0 gg/l TAME, DIPE, TBA <br /> and 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 Second <br />' Quarter - 2004 monitoring event are depicted on Figure 3, Petroleum Hydrocarbons in Groundwater - <br /> May 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 <br /> I <br /> Project No 58475-06-24K -3- June 22,2004 <br />