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,* CAMBRIA <br /> was detected in the sample collected at 61-64 fbg at 280 ppb No other fuel oxygenates or lead <br /> scavengers were detected in any of the other samples from this boring <br /> Samples were collected at or near first encountered groundwater from borings CPT-3 through <br /> CPT-6 at depths ranging from 50-53 to 58-62 fbg TPHg was detected in the sample collected <br /> from CPT-5 at 4,100 ppb Benzene was not detected in any of the samples MTBE was detected <br /> in each of the samples at concentrations ranging from 8 8 to 390,000 ppb, with the highest <br /> concentration in CPT-5 TAME was detected to the samples collected from CPT-3 and CPT-5 at <br /> 3 2 and 1,400 ppb, respectively, and TBA was detected in CPT-3 and CPT-5 at 170 and 59,000 <br /> ppb, respectively CPT-5 also contained 24 ppb ETBE No other fuel oxygenates or lead <br /> scavengers were detected in any of the other samples from these borings <br /> Groundwater data are summarized in Table 3 and TPHg, benzene, and MTBE results are <br /> presented on Figure 3 The certified analytical reports for the water samples are presented in <br /> Appendix C <br /> SITE CONCEPTUAL MODEL <br /> Cambria completed a site conceptual model for this site and included it as Appendix D <br /> CONCLUSIONS <br /> Borings CPT-1 and CPT-2 were drilled south of the USTs to delineate the vertical extent of <br /> petroleum hydrocarbons and fuel oxygenates detected in soil Soil samples were collected to <br /> depths of 100 fbg No petroleum hydrocarbons were detected in the soil samples MTBE was <br /> detected at 3 5 ppm at 62 fbg in CPT-1 Deeper samples did not contain MTBE No other fuel <br /> oxygenates were detected in soil from these borings Therefore, the vertical extent of petroleum <br /> hydrocarbons and fuel oxygenates in soil near the USTs is defined <br /> Groundwater samples were collected from boring CPT-1, near the USTs, and from borings <br /> CPT-2 through CPT-6, to assess the lateral impact to groundwater TPHg was detected in <br /> borings CPT-2 and CPT-5, but benzene was not detected in groundwater from any of the borings <br /> MTBE was detected in groundwater from all the borings The highest concentrations were <br /> detected in borings CPT-5 and CPT-1, and the lowest concentrations were detected in CPT4 and <br /> CPT-6 Concentrations appear to be highest in the shallow groundwater samples <br /> 0955 6 <br />