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C A M B R I A <br /> 0 <br /> The soil chemical analytical data (including data from SB-3 and other previous work) are <br /> summarized in Table 3 and TPHg, benzene, and MTBE results are presented on Figure 2 <br /> Laboratory analytical reports are included in Appendix D <br /> Hydrocarbon Distribution in Groundwater <br /> TPHg and BTEX were not detected in any of the site wells, although some reporting limits were <br /> elevated MTBE was detected in groundwater samples collected from wells MW-1 through <br /> MW-4, MW-7, P-1, and P-2 at concentrations ranging from 460 to 120,000 ppb TBA was <br /> detected in wells MW-1 through MW-4, P-1, and P-2 at concentrations ranging from 860 to <br /> 33,000 ppb TAME was also detected in piezometer P-1 at 310 ppb No other fuel oxygenates <br /> were detected in groundwater samples collected from the wells <br /> The groundwater chemical analytical data are summarized in the well concentrations table in <br /> Blaine's report (Appendix C) and in Table 4 Benzene and MTBE results are presented on <br /> Figure 3 Laboratory analytical data are included in Blaine's report(Appendix C) <br /> • Conclusions <br /> Soil results from well borings MW-5 through MW-7 delineate fuel oxygenates laterally in soil <br /> north,east, and southeast of the USTs The lateral extent of TPHg and benzene in soil is defined <br /> by the soil borings Cambria drilled during January 1999 The vertical extent of TPHg, benzene, <br /> and fuel oxygenates in soil is defined by CPT borings Cambria drilled during October 2001 <br /> MTBE, TBA, and TAME have been detected in groundwater beneath the site Wells MW-5 and <br /> MW-6 delineate the Iateral extent of impacted groundwater north and northeast of the USTs <br /> TPHg and BTEX were not detected in groundwater samples from the wells, although some <br /> reporting limits were elevated The vertical extent of TPHg, benzene, and fuel oxygenates <br /> (except MTBE)in groundwater is defined by CPT borings Cambria drilled during October 2001 <br /> Recommendations <br /> Cambria recommends gauging and sampling all site wells quarterly to determine if there are <br /> seasonal fluctuations in the observed groundwater elevations and chemical concentrations and to <br /> establish a predominant groundwater flow direction over time Historically, TPHg, BTEX, <br /> MTBE, TBA, and TAME have been detected in groundwater beneath the site Therefore, we <br /> recommend that the groundwater samples from all wells be analyzed for TPHg, BTEX, and fuel <br /> 0955 8 <br />