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TABLE 4: GROUNDWATER PURGE FIELD DATA <br /> Well Volume Purged pH Conductivity Tempersture <br /> (Gallons) (pH units) 40cm) (Degrees °F) <br /> MW-1 4 726 1433 682 <br /> 8 726 1452 680 <br /> 12 730 1432 682 <br /> 16 729 1433 68.4 <br /> 20 728 1435 685 <br /> ' MW-2 2 727 1314 67.0 <br /> 4 718 1314 671 <br /> 6 715 1326 672 <br /> 8 713 1316 67.3 <br /> 10 712 1318 673 <br /> MW-3 2 700 2350 68.0 <br />' 4 701 2310 68.2 <br /> 6 699 2350 68.0 <br /> 8 700 2350 68.1 <br /> MW-5 2 710 1410 68.2 <br /> 4 702 1449 67.5 <br /> 6 694 1466 674 <br /> t 8 690 1466 660 <br /> 10 692 1457 663 <br /> 12 693 1460 663 <br /> 3.4 Discussion of Groundwater Quality <br /> Repeated sampling of the monitor wells at the site have only detected trace levels of <br />' different petroleum related compounds over time Motor oil-range hydrocarbons (16 2 mg/1) <br /> was detected in MW-1, June 1992 The results of the July 1993 analyses detected total <br />' xylenes (0.9 pg/L) in the sample from MW-1 and ethyl-benzene (0 6 pg/L) in the samples <br /> from MW-2 The analytical results of the December 1993 groundwater sampling detected <br />' toluene, total xylenes, and diesel at 1.9 pg/L, 0 7 pg/I., and 0.1 mg/L, respectively in the <br /> sample from MW-2 and toluene and total xylenes at 0 5 pg/L and 0.7 pg/L, respectively in the <br />' sample from MW-1. The recent analysis of groundwater at the site detected diesel-range <br /> compounds in MW-3 (0.06 mg/L) and MW-5 (01 mg/L) Because of the general nature of <br />' TPH analyses and due to the fact that these reported detections are just above the reporting <br /> limit, these detections may be attributable to non-petroleum, diesel-range compounds. <br /> Table 5 summarizes the groundwater quality data from the site <br />