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' C A M B R I A Mx Ron Rowe <br /> April 16, 1999 <br /> summarized in Table 1 Complete analytical reports for the investigation are included in <br /> Attachment F <br /> CPT Ground Water Analytical Results No TPPH, BTEX, TAME, DIPE, ETBE, tert-Butanol, <br /> or ethanol were detected in the grab ground water samples MTBE was detected in three <br /> groundwater samples from two of the CPT borings Detected MTBE concentrations were <br /> 3010 micrograms per liter (gg/L) and 141 gg/L in CPT-11 at depths of 48 ft-bgs and 55 5 ft-bgs, <br /> respectively, and 27 µg/L in CPT-12 at a depth of 30 ft-bgs Methanol was detected at 2 0 gg/L <br /> m only the sample from CPT-11 at 48 ft bgs Analytical results are summarized in Table 2 <br /> Complete analytical reports for the investigation are included in Attachment F <br /> IGround Water Analytical Results: No TPPH, benzene, toluene, ethylbenzene, EDB or 1,2 DCA <br /> were detected in the ground water samples from the newly installed extraction and ground water <br /> monitoring wells MTBE was detected in wells MW-1 and EW-1 by EPA Method 8020 at <br /> concentrations of 112,000 gg/L and 5,090 gg/L, respectively Toluene was detected in wells <br /> MW-2 and MW-3 at concentrations of 190 gg/L and 193 gg/L, respectively Xylenes were <br /> detected in wells MW-2 and MW-3 at concentrations of 0 602 pg/L and 0 672 gg/L, respectively <br /> Methanol was detected only in MW-3 at 2 3 gg/L Analytical results are summarized in Table 3 <br /> Complete analytical reports for the investigation are included in Attachment F <br />' CONCLUSIONS <br /> The horizontal and vertical extent of TPPH, BTEX, MTBE, and methanol in soil were defined by <br /> the CPT boring installations during thus phase and previous phases of the investigation <br /> The lateral extent of hydrocarbons in ground water is defined to the north, south, and southeast by <br /> this investigation, and to the southwest and west by this and previous phases of the investigation <br /> To the east in boring CPT-12, MTBE concentrations decrease with depth, and were not detected <br /> at more than 30 ft bgs The horizontal extent of MTBE is defined to the north by well MW-3 <br /> CPT borings CPT-1, CPT-2, and CPT-11 show that MTBE concentrations in ground water <br /> decrease with depth along the southeastern edge of the site, in the vicinity of the source area <br /> Concentrations attenuate to 141 }ig/L at 55 5 ft bgs in CPT-11 <br /> I <br /> 6 <br />