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F <br /> '1 <br /> i <br /> i <br /> ' 22 May 2001 <br /> AGE-NC Project No 95-0167 <br /> Page 8of10 <br /> ' Men itoi in- Well Water Samples <br /> ' Each ground water well sample was analyzed for TPH-g, BTEX, and seven fuel additives in <br /> accordance with EPA Methods 8015M, 8020 and 8260 Modified <br /> ' • TPH-g was detected in the water samples collected from monitoring wells MW-1,MW-2 and <br /> MW-3 at concentrations of 120,0004g11, 540 4g/1 and 120 ug/l, respectively <br /> • BTEX compounds were detected in five of the six water samples collected from monitoring <br /> wells MW-1 through MW-6 Benzene was detected at concentrations as high as 18,000 ,ug/l <br /> (MW-1) <br /> • Other BTEX compounds were detected in ground water monitoring well samples at <br /> concentrations as high as 13,000 µg11 (xylene) <br /> • The samples from well MW-4 had no detectable hydrocarbon concentrations <br /> ' MTBE was detected by EPA Method 8260 Modified in samples from wells MW I and MW2 <br /> at concentrations of 480 ,ug/I and 8 0 4g/l, respectively <br /> • No other fuel oxygenated or lead scavenger compounds were detected above the laboratory <br /> reporting limits <br /> Analytical results fromab d water samples collected on 14 November�" ground p o ember .000 are summarized <br /> in Tables 3 and 4 The laboratory reports (Me Campbell Analytical Laboratory ID 53274 to 53276), <br /> QA/QC reports and chain-of-custody forms are included in Appendix C Analytical results of water <br /> samples collected during the 15 November 2000 sampling event are summarized on Tables 5 and 6 <br /> ' The laboratory report(MAI Sample ID Nos 53994 to 53999), QA/QC report and chain-of-custody <br /> form are in Appendix C Figure 4 depicts the estimated areal distribution of impacted ground water <br /> containing TPH-g and benzene for 14/15 November 2000 <br /> 1 <br /> 3 4 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) The monitonng data and purge data for the <br />' sampling of well MW-1 was lost and therefore the data is not available for this report <br /> For the 15 November 2001 sampling event, depths to ground water ranged from 14 47 feet to 13 85 <br />' feet below the tops of the well casings Ground water elevations at the site ranged from 4 38 feet to <br /> . 5 39 feet below mean sea level (MSL) <br /> - t <br /> Advanced Ge0Environmental Inc <br />