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' 16 May 2002 <br /> . AGE-NC Project No 99-0657 <br />' Page 5 of 6 <br /> 80µg/1,respectively TPH-d was detected in samples CPT2-93-97 and CPT3-90-94 at concentrations <br /> of 280µg/1 and 220 gg/l,respectively BTEX compounds were detected in samples CPT2-93-97 and <br /> CPT3-90-94 at concentrations as high as 11 µg/l benzene,32 µg/1 toluene, 11 µg/1 ethylbenzene and <br /> 61 µg/l total xylenes MTBE was detected in the same samples at a concentrations of 5 0 µg/1 and <br /> 5 1 µg/1, respectively <br />' Ground water samples CPT 1-121-125,CPT2-121-125 and CPT3-121-125 were collected from HU6 <br /> TPH-g was detected in samples CPT2-121-125 and CPT3-121-125 at concentrations of 9,900 µg/1 <br /> and 55 ug/l, respectively TPH-d was detected in samples CPT1-121-125, CPT2-121-125 and <br /> CPT3-121-125 at concentrations of 100 µg11, 3,800 µg/1 and 170 µg/l, respectively On or more <br /> BTEX compounds were detected in samples CPT2-121-125 and CPT3-121-125 at concentrations <br /> as high as 95 µg11 benzene, 570 µg/1 toluene,210 µg/1 ethylbenzene and 1,300 µg/1 total xylenes, in <br /> sample CPT2-121-125 MTBE was detected in samples CPT2-121-125 and CPT3-121-125 at a <br /> concentrations of 66 µg/1 and 4 5 gg/l, respectively In addition, 1,2-DCA was detected in sample <br /> CPT2-121-125 at a concentration of 3 2 µg/1 <br /> The laboratory report (MAI Lab I D 0202179-001-0202179-004, 0203012-001-0203012-003 and <br /> 0203032-001-0203032-003)QA/QC report and chain-of-custody form are included in Appendix B <br /> 10 Analytical results of the CPT grab ground water samples are summarized in Table 1 <br /> 1 4 0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes <br /> Sand, cemented sand and silty sand were encountered at depths between 5 feet bsg and 15 <br /> feet bsg, 18 feet to 20 feet bsg,25 feet to 30 feet bsg, 38 feet to 45 feet bsg, 63 feet to 76 feet <br /> bsg, 86 feet to 95 feet bsg and 103 feet bsg to 128 feet bsg Sandy silt, silt and clay were <br /> observed at all other depths <br /> - Significant concentrations of petroleum hydrocarbons were detected In the samples collected <br /> from boring CPT-2 from units HU3,HU5 and HU6 Lesser concentrations of hydrocarbons <br /> were detected in the water samples collected from CPT-3 from the same hydrologic units <br /> Very low concentrations of toluene, xylenes and MTBE were detected in sample <br /> CPT I-40-44 Concentrations of toluene, xylenes and MTBE detected from bonng CPT-1 <br /> were below the State of California Primary Maximum Contaminant Levels (MCLS) <br /> Constituents of concern detected in ground water samples collected during the CPT <br /> investigation are depicted in cross sectional view A-A'(Flgure 4) <br /> - The vertical extent of petroleum hydrocarbon-impacted ground water is defined off-site in <br /> the area of soil boring CPT-1 The vertical extent Is undefined in the area of and <br /> down-gradient of the former and existing USTs, in the areas of CPT-2 and CPT-3 <br />! Advanced GeoEnviroamental,Inc <br />