ARCHIVED REPORTS XR0010096 - Laserfiche WebLink

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Groundwater Contour Map and Flow Gradient A groundwater contour reap was prepared for the data listed in Table 1 above (see Figure 1) Groundwater elevation contours were plotted to a known datum The groundwater flow direction was to the north-northeast under a calculated gradient of 0 0028 The flow direction is consistent with historic observed trends, and remains relatively flat A small groundwater mound appears near the center of the site Chemical Analytical Methods and Results Nine groundwater samples were analyzed using EPA Methods 503018015, 602 and 8260 for Total Petroleum Hydrocarbons as Gasoline (TPHG), Benzene, Toluene, Ethylbenzene and Xylene (BTEX) and fuel oxygenates including Methyl-tert-butyl-ether (MTBE) The analytical results of the groundwater samples are attached and listed below (see Table 2), Table 2 Groundwater Chemical Data Well Date TPHG Benzene Toluene Ethylbenzene Xylene Fuel Ox No Sampled ug/l MW-1 3/28/96 NO ND NO NO ND NA MW-1 6/27/96 280 0 7 06 2 4 91 NA MW-1 9123/96 NO NO NO ND NO NA MW-1 12/19/96 NO ND NO NO NO NO MW-1 3/10/97 NO ND NO ND NO NO MW-1 6/30197 NO NO NO NO NO NO MW-1 8/20/97 NO NO NO NO NO NO MW-1 12/12/97 NO NO NO NO NO NO MW-2 3/28196 12,000 80 50 7 7 20 NA MW-2 6127196 4,900 7 2 48 21 25 NA MW-2 9123196 4,500 59 28 15 14 NA MW-2 12/19/96 4,400 9 9 86 25 26 NO MW-2 3/10197 4,000 5 5 21 13 12 ND MW-2 6130197 3,500 3 9 1 3 11 15 NO MW-2 8120197 4,700 1 1 05 10 17 ND MW-2 12/12/97 760 63 38 110 180 NO MW-3 3/28/96 2,500 21 12 12 24 NA MW-3 6/27196 3,100 13 7 0 8 7 19 NA MW-3 09/23/96 2,600 19 88 11 19 NA MW-3 12/19/96 2,900 12 8 4 81 16 ND MW-3 3/10197 1,500 10 3 9 50 91 NO MW-3 6130/97 970 2 7 0 6 4 2 6 2 NO MW-3 8/20197 1,000 35 1 4 31 4 5 ND MW-3 12/12/97 350 33 42 48 170 ND MW-4 8/20/97 NO NO NO NO NO ND MW-4 12/12/97 NO ND ND NO NO ND