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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 December 6, 2000 <br /> The vJroundwater elevation has decreased by an average of 0 7 feet at the three monitor <br /> wells since the previous quarterly monitoring round on September 27, 2000 The flow <br /> direction is to the north-northeast 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 December 6, 2000 are shown in Table 1 Copies of the laboratory <br /> reports are included as Appendix C of this report <br /> TPH-G concentrations ranged from a maximum of 20,000 u;/l at monitor well MW 1 to <br /> 2700 u(,,/] at monitor well MW2 <br /> Benzene concentrations ranged from a maximum of 5700 ug/1 at MW 1 to 680 ug/l at <br /> ` NV2 <br /> MTBE concentrations ranged from a maximum of 61 ug/l at MW3 to 14 ug/I at MW2 <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 December 6, 2000 The decrease in overall groundwater elevation <br /> since the previous quarterly monitoring round was not accompanied by significant <br /> changes in the 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 MW1, MW2, and MW3 following <br /> installation of additional monitorinu .cells to insure proper determination of groundwater <br /> Lrcadjent and flow direction <br /> 3 Arc Pump QM 7-9, 2000 <br />