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i contamination from all compounds except motor oils and MTBE in B-6 B-6 is located in the <br /> vicinity of the former used oil USTs Gasoline contamination is higher in the groundwater from <br /> B-6 than from MW-2, indicating that the former used oil USTs may not be the source of gasoline <br /> and BTEX contamination <br /> i No contamination was present in the groundwater in B-7, located south of the former diesel <br />. USTs <br />• Table 3. Groundwater Sample Results from Report of Investigation Dated 23 January 2001 <br /> Sample TPH- TPH- Motor Ethyl Total <br />. ID Gasoline' Diese14 Oi1s3 MTBE Oxygenates BenzeneZ Toluenez Benzene XylenesZ <br /> B-6 26 6 5 ND ND 0.1935 0.058 00012 0.3 0.141 <br /> B-7 ND ND I ND ND ND IND IND ND ND <br /> Notes All results shown in ppm <br /> 'Detection limits for analyses on tlus sample were 0 05 ppm <br /> 2Detection limits for analyses on this sample were 0 0005 ppm <br /> 3Detection limits for analyses on this sample were 1 ppm <br /> 4Diesel detection linut 0 5 ppm <br /> 5Includes 0 187 ppm DIPE and 0 00622 ppm TBA <br />• ND=Not detected at or above the indicated laboratory detection limit <br /> The groundwater was sampled on 26 July 2000 (Quarterly Monitoring Report dated 31 August <br />• 2000) The results, found in Table 4 below, indicate continued contamination of all compounds <br />• except diesel in MW-2 The diesel contamination in MW-3 is no longer evident and the diesel <br /> contamination in MW-1 has decreased MW-1 also shows increased ethyl benzene <br />• contamination as well as total xylenes contamination <br /> Motor oils in MW-2 have decreased while the petroleum hydrocarbons remain constant <br />• <br /> 30 <br />• <br /> i <br />• <br />• <br /> i <br />. Environeenng,Inc Project No 01-00109 Page 5 <br />