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• RESULTS OF UARTERLYGROUNT <br /> DWATER MONITORING <br /> 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 five on-site monitor wells on September 27, 2000 <br /> The groundwater elevation has decreased by an average of 2 63 feet at the five monitor <br /> wells since the previous quarterly monitoring round on June 8, 2000 The groundwater <br /> elevation gradients form a trough through the site with flow towards the northeast The <br /> predominate groundwater elevation gradient (MW3 towards MW4) at the site for <br /> September 27, 2000 averaged 0 0005 feet/linear foot and varied between 0 0017 <br /> feet/linear foot from MW1 towards MW4 and 0 0008 feet/linear foot from MW8 towards <br /> MW2 <br /> RESULTS OF CERTIFIED ANALYSIS OF GROUNDWATER SAMPLES <br /> The results of the certified analyses of groundwater samples collected from the five <br /> monitor wells on September 27, 2000 are shown in Table I Copies of the laboratory <br /> reports are included as Appendix C of this report <br /> TPH-G concentrations ranged from a maximum of 27000 ug/l at MW i to less than the <br /> laboratory detection limits of 50 ug/l at the remaining four monitor wells <br /> Benzene concentrations ranged from a maximum of 3400 ug/1 at MW I to less than the <br /> laboratory detection limits of 0 5 ug/I at MW3, MW4, and MW5 <br /> MTBE concentrations ranged from a maximum of 97 ug/l at MWI to less than the <br /> laboratory detection limits of 0 5 ug/1 at MW2 and MW4 <br /> Figure 5 shows the distribution of TPH-G, BTEX, and MTBE in groundwater as <br /> determined from groundwater samples collected on September 27, 2000 The decrease in <br /> tiroundwater elevation at the site since the previous quarterly monitoring round did not <br /> produce significant changes in the concentrations of TPH-G, BTEX, and MTBE observed <br /> in the five monitor wells at the site <br /> RECOMMENDATIONS <br /> Proceed with the workplan dated October 6, 2000 to provide specifications for the <br /> following items that have been pre-approved by the UST Cleanup Fund Program <br /> I) Install offsite monitor well(s) west of NIW 1 to define downgradient extent of <br /> groundwater contamination plume <br /> Sanchez QM 7-9, 2000 <br />