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Geological Technics Inc. Page 2 <br /> Groundwater Monitoring Report <br /> 1 Project No.425.2 <br /> November 17,2003 <br /> • TPH-G concentrations for the September 2003 event are the highest recorded to date <br /> { in MW-5. <br /> • Only one of the deeper screened wells (MW-102) was analyzed this quarter and was <br /> found to be cion-detect. This is the twelfth consecutive event that this condition has <br /> been documented. It appears the contamination has not migrated vertically at the <br /> site. <br /> • Three monitored domestic wells tested during the September 2003 were non-detect <br /> for all analyzed constituents. This suggests contamination has not migrated to lower <br />' aquifers. <br /> 1.0 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 5, 2003, was 73.26 feet above t <br /> mean sea level. This represents an increase of 0.24 feet since the June 2003 monitoring <br /> f r- event. The water table groundwater gradient was 0.0013 ft/ft flowing N05°E. i <br /> The average groundwater elevation in the intermediate depth wells (MW-102, MW-105 & <br /> MW-107) for the September 2003 monitoring event was 73.00 feet above mean sea level <br /> and the intennediate depth groundwater gradient was 0.0018 ft/ft flowing N36°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 0.0009 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 3 illustrates the September 5, 2003, shallow groundwater gradient. <br /> III. <br /> The predominant groundwater flow is to the east-northeast with the slope ranging from <br /> 0.0014 to 0.0270 ft/ft in the intermediate wells. Table 2 of Appendix A summarizes the <br /> intennediate groundwater gradients and levels to date, and Figure 4 illustrate the September <br /> 5, 2003, groundwater direction and gradient in the intennediate wells. <br /> Table 2 also sutnmarizes theroundwater level data from the dee well, MW-202. <br /> g p <br /> The historical water table and intermediate groundwater gradients are included in Figures 5 <br /> & 6- Shallow and Intermediate Rose Diagrams. <br /> f <br /> i <br /> . I <br />