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i <br /> Geological ncknks kc Page 2 <br /> Groundwater Monitoring Report <br /> Project No 425 2 <br /> December 5,2002 <br /> i' • All of the deeper screened wells (MW-1Q2, MW-105 MW-107 and MW-202) were <br /> non-detect for the event This is the eighth consecutive event that this condition has <br /> been documented <br /> ' 10 GROUNDWATER MONITORING <br /> 1.1 Hydrology of Site <br /> 1 1.1 Horizontal Groundwater Gradients <br /> The average water table elevation at the site on September 11, 2002, was 73 49 feet above <br /> mean sea level This represents a decrease of 0 33 feet since the June 2002 event The <br /> water table groundwater gradient was 0 0013 ft/ft flowing N 17°E <br /> The average groundwater elevation in the intermediate depth wells (MW-102, MW-105 & <br /> MW-107) for the monitoring event was 73 36 feet above mean sea level and the <br /> intermediate depth groundwater gradient was 0 0023 ft/ft flowing N75°E <br /> A review of the groundwater gradients shows that the predominant groundwater flow varies <br /> from north to northeast with the slope ranging from 0 0011 up to 0 0044 ft/ft in the water <br /> table wells Table 1 of Appendix A summarizes the water table groundwater gradients and <br /> levels to date, and Figure 2 illustrates the September 11, 2002, groundwater direction and <br /> gradient The predominant groundwater flow is to the east-northeast with the slope ranging <br /> from 0 0016 to 0 027 ft/ft in the intermediate wells Table 2 of Appendix A summarizes the <br /> ' intermediate groundwater gradients and levels to date, and Figure 3 illustrate the September <br /> 11, 2002, groundwater direction and gradient in the intermediate wells <br /> Table 2 also summarizes the groundwater level data from the deep well, MW-202 <br /> ' The historical water table and intermediate groundwater gradients are included in Figures 4 <br /> & 5- Shallow and Intermediate Rose Diagrams <br /> ' 1.1.2 Vertical Groundwater Gradients <br /> Vertical groundwater gradients were calculated using MW-2/MW-102 <br /> ' (shallow/intermediate well pair) and MW-102/MW-202 (intermediate/deep well pair) <br /> During the September 2002 event, the vertical groundwater gradient in the <br /> shallow/intermediate well pair was in an upward direction with a magnitude of 12 times that <br /> of the horizontal gradient The vertical gradient in the intermediate/deep well pair was <br /> upward at a magnitude of approximately 20 tildes that of the horizontal gradient <br />