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14 February 2000 <br /> AGE-NC Project No 96-0254 <br /> IPage 8 of 10 <br />' detected in all three of the grab ground water samples analyzed at concentrations ranging <br /> from 220 µg/l to 36,000 µg/l <br /> • Benzene was detected in the water samples analyzed at concentrations ranging from 48 µg/1 <br /> Iin probe boring PBI at a depth of 42 feet bsg to 6,800 µg/l in boring PB4, south of the <br /> former dispenser area Toluene was detected in each of the water samples analyzed at <br /> concentrations ranging from 83 µ.g/1 to 11,000 µg/l Other BTEX compounds were also <br /> detected at concentrations as high as to 9,900 µg/l <br /> • MTBE was not detected in three grab water samples analyzed <br /> Analytical results of grab ground water samples analyzed are summarized in Tables 4 and 5 The <br /> laboratory reports (MAI Laboratory ID 25114 to 25116), quality assurance and quality control <br /> (QA/QC) reports and chain-of-custody forms are included In Appendix E <br /> I342 Ground Water Monitoring Wells <br /> • TPH-g was detected in three of the monitoring well samples collected from the site at <br />' concentrations ranging from 1,300 µg/1 (MW-IB) to 6,900 µg/1 (MW-7) TPH-d was <br /> detected in the same three well samples at concentrations ranging from 84 µg/l (MW-1B)to <br />' 2,800µg/l (MW-7) <br /> • Benzene was detected in five of the ground water well samples(MW 1-A, MW I-B,MW2-A, <br /> MW-4, and MW-7) Well MW-7, below the area of the former UST excavation, contained <br />' benzene at a concentration of 310µg/l Benzene concentrations ranged from 14µg/1 to 390 <br /> µg/1 in the other well samples with detections <br />' Other volatile organic compounds were detected at concentrations as high as 970 4g/1 <br /> (xylenes) <br /> • MTBE was detected by EPA Method 8260 Modified in wells MW-1B, MW-2B and MW-4 <br />' at concentrations ranging from 1 9 µg/l to 8 9 µg/l TBA was also detected in one sample <br /> at a concentration of 1,200µg/1 (MW-7) <br />' Figure 4 depicts an approximate areal distribution of impacted ground water containing benzene <br /> Analytical results from ground water samples are summarized in Table 2 The laboratory report <br />' (MAI Lab ID Numbers 26930 through 26938),QA/QC and chain-of-custody are included In <br /> Appendix G <br /> 1 <br /> 3 5 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br />' A California state-licensed survey engineer from Baumbach&Piazza Inc surveyed a reference point <br />' Advanced GeoEn-.jronment&I Inc <br />