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' 1 I t ' ` Y 1 I , 19 July 2004 AGE -NC Project No 95-0121 ' ' t Page 7 of 9 , � r , I I '} Various BTEX` compounds were detected from the above seven "grab' water samples at concentrations as high as 2,800 µg/1 benzene (CPT -3), 150 µg/1 toluene (CPT -2), 510 µg/1 ethylbenzene (CPT -3), and 220 gg/1 total xylenes (CPT -2) The greatest benzene concentration detected was from CPT -3 at a concentration of 2,800 µg/1(See Figure 5)^ i MTBE was not detected above laboratory reporting limits in any of the ground water samples ' analyzed I 1,2 -DCA was detected in six `grab' water samples collected from CPT -1(96-99 feet), CPT -2 (47-50 t ' feet, 65-68 feet, 79-82 feet and 95 to 98 feet) and CPT -3 (50-53 feet) at concentrations as high as 250 r - µg/1(CPT-2/47-50 feet) ' TAME was detected in three `grab' water samples collected from CPT -1(96-99 feet), CPT -2 (79-82 feet) and CPT -3 (50-53 feet) at concentrations as high as 49 µg/1(CPT-3/50-53 feet) i ' DIPE was detected in one `grab' water sample collected from CPT -2 (65-68 feet) at a concentration d , of 8 3 gg/1 I• No other petroleum hydrocarbon constituents or fuel oxygenated compounds were detected by laboratory analysis The laboratory report (CTEL Project Number CT214-0402032) and chain -of - custody forms are presented in Appendix C GeoTracker confirmation pages of the submitted laboratory electronic deliverable format (EDF) files are included in Appendix D j.0.' SUMMARY AND CONCLUSIONS r S ' The implications of the February 2004 CPT investigation results are as follows • Although soil distribution may locally vary, AGE interpreted the CPT data collected from I CPT -1 through CPT -4 to represent the typical soil types beneath the site, cross section A -A' was constructed and depicts the general lithology beneath the site (Figure 3) • AGE interpreted the CPT'data to identify Itwo potential hydrogeologic flow units informally' identified as HU2-First Flow Unit (located between 25 and 32 feet), and HU4-Second Flow Unit (located between 40 and 53 feet) Generally, permeable to semi -permeable lithology was { observed in HU2 and in HU4 that consisted of fine to medium sand and silty fine sand to �1 sandy silt • AGE interpreted the CPT data to identify three semi-confining/confining units informally' Iidentified as HU1 (located between 18 and 25 feet), HU3 (located between 32 and 40 feet) . . and HU5 (located between 53 and 100 feet) Generally, less -permeable lithology was observed from HU1, HU3 and HU5 that consisted of fine grained, silty clay and clayey silt Advanced GeoEnvironmental, Inc II I 4 j I