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Following depth to water measurements, WEGE and PWP personnel used a truck <br /> mounted vacuum lift pump and dedicated one inch diameter PVC tubing to purge each <br /> well of three volumes of water <br /> After purging, the wells were allowed to recover to at least 80% of their original well <br /> volumes A groundwater sample was then collected from each well with a polyethylene <br /> bailer and decanted with no headspace into two 40 ml VOA vials contammg 0 5 ml HCL <br /> acid as a preservative <br /> The samples were delivered with accompanying chain of custody documentation to KIFF <br /> Analytical LLC (DHS certified #2236) analyzed the water samples from each monitor <br /> well for concentrations of TPH-G, BTEX and MtBE using EPA method 8260B <br /> DISPOSITION OF WASTEWATER <br /> Groundwater purged during the August 21, 2001 sampling of the momtor wells was <br /> temporarily contained on-site in Iabeled 55 gallon DOT approved drums <br /> RESULTS OF QUARTERLY GROUNDWATER MONITORING <br /> GROUNDWATER GRADIENT AND FLOW DIRECTION <br /> A-ZONE <br /> Figure 4 uses the new survey elevations supplied by KJeldsen, Sinnock & Keudeck, Inc <br /> survey dated May 1, 2001 Casing elevations from the new survey showed a decrease of <br /> 0 54 to 0 55 feet in elevation Figure 4A shows the groundwater elevation gradient and <br /> flow direction determined from depth to water measurements at the five on-site monitor <br /> wells and the newly installed A Zone wells on April 18, 2001 The groundwater <br /> elevation has decreased by an average of 3 feet at the five monitor wells (MWI, MW2, <br /> MW3, MW4 & MWS) since the previous quarterly monitoring round on April 18, 2001 <br /> The current groundwater gradient shows a shallow trough forming from the newly <br /> installed cluster wells RI towards MW2 with a flow direction to the west <br /> B ZONE <br /> Monitor wells MWI, MW2, MW3, MW4, MW5 penetrate both the A and B zones <br /> Figure 4B show the gradient determination for the B Zone utilizing only the cluster wells <br /> RIB, MW6B and MW7B The flow direction is relatively flat (0 0017 ft/linear ft) and to <br /> the north <br /> 5 Sanchez 3rd QM 2001 <br />