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Table 1 Monitoring Wells Water Levels, con't <br /> Well Date Well Depth to Casing Water Floating <br /> No Sampled Depth Water Elev Elev Product <br /> (f0 (ft) (MSL ft)" (MSL ft) <br /> MW-3 9/14/95 16 28 7 65 47 94 40 29 None <br /> MW-3 3/28/96 1615 690 ----- 41 04 None <br /> MW-3 6/27/96 1610 737 ----- 41 57 None <br /> MW-3 12/19/96 1610 725 ----- 40 69 None <br /> MW-3 3/10/97 1610 716 ----- 40 78 None <br /> MW-3 6/30/97 16 10 7 64 ----- 40 32 None <br /> * Casing elevation Data from Evax Technologies, Site Investigation Report, April 7, 1992 <br /> The sampler proceeded to purge well volumes of groundwater from the well using a submersible <br /> electric purging pump (a calculation was done for each well following sounding measurements) <br /> Between each well volume purge, conductivity, pH, and water temperature readings were <br /> obtained and noted on the attached groundwater sampling information sheets Once these <br /> readings stabilized after two consecutive purge volumes aquifer water is assumed to be entering <br /> the well When the well recovered to about 80% of the initial water level, the sample was <br /> collected Purge water was stored on-site in drums The well sampling information sheets <br /> containing data on temperature, conductivity, pH, depth to water, and well volumes purged are <br /> attached <br /> The groundwater sample was collected with a new disposable bailer The groundwater sample <br /> was then poured with minimum cavitation into the appropriate, laboratory prepared sample <br /> containers leaving no headspace The sample container was then immediately capped, labeled and <br /> placed in a chilled ice chest for shipment to Priority Environmental Laboratory in Milpitas, <br /> California (a State Certified Testing Lab) under chain-of-custody documentation <br /> Groundwater Contour Map and Flow Gradient <br /> A groundwater contour map was prepared for the data listed in Table 1 above (see Figure 1 ) <br /> Groundwater elevation contours were plotted to a known datum The groundwater flow direction <br /> was to the north-northeast under a calculated gradient of 0 0038 The flow direction is <br /> consistent with historic observed trends, and remains relatively flat <br /> Chemical Analytical Methods and Results <br /> y <br /> Three groundwater samples were analyzed using EPA Methods 5030/8015 and 602 for Total <br /> Petroleum Hydrocarbons as Gasoline (TPHG), Benzene, Toluene, Ethylbenzene and Xylene <br /> (BTEX) and Methyl-tert-butyl-ether (MTBE) The analytical results of the groundwater <br /> samples are attached and listed below (see Table 2), <br /> Page 2 <br />