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GROUNDWATER GRADIENT AND FLOW DIRECTION <br /> Figure 4 shows the groundwater elevation gradient and flow direction determined from <br /> depth to water measurements at the three on-site monitor wells on March 16, 2001 The <br /> groundwater elevation has increased by an average of 0 57 feet at the three monitor wells <br /> since the previous quarterly monitoring round on December 6, 2000 The flow direction <br /> is to the east The overall gradient is 0 002 feet/linear foot <br /> RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES <br /> The results of the certified analyses of groundwater samples collected from the three <br /> monitor wells on March 16, 2001 are shown in Table 1 Copies of the laboratory reports <br /> are included as Appendix C of this report <br /> TPH-G concentrations ranged from a maximum of 4900 ug/1 at monitor well MW 1 to <br /> 2000 ug/l at monitor well MW2 <br /> Benzene concentrations ranged from a maximum of 2000 ug/1 at MW1 to 670 ug/l at <br /> MW2 <br /> MTBE was not detected in concentrations above the laboratory detection limits of 20 ug/l <br /> (MW i and MW2) and 50 ug/1 (MW3) <br /> Figure 5 shows the distribution of TPH-G, BTEX, and MTBE in groundwater and the <br /> estimated lateral limits of the TPH-G in groundwater as determined from groundwater <br /> samples collected on March 16, 2001 The increase in overall groundwater elevation <br /> since the previous quarterly monitoring round was accompanied by reductions in the <br /> TPH-G, BTEX, or MTBE concentrations at the three monitor wells <br /> RECOMMENDATIONS <br /> 1) Continue implementation of September 28, 1999 workplan to install additional <br /> groundwater monitoring wells <br /> 2) Re-survey monitor well casing elevations at MWI, MW2, and MW3 following <br /> installation of additional monitoring wells to insure proper determination of groundwater <br /> gradient and flow direction <br /> 3 Arc Pump QM 1-3, 2001 <br />