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Geofvgual7ecFinus Inc - ----- - r —-- -- —- - page 2 - <br /> Groundwater Monrtonng Report <br /> Project No 425 2 <br /> February 1,2001 <br /> account for these differences but variations in community groundwater pumping and <br /> rainfall may be causal factors Thus during low pumping demand, the vertical <br />' groundwater gradient would be expected to be upward, and the inverse would also <br /> be expected <br /> 2 Groundwater Contamination <br /> • Floating product-�rM-averoutinely been detected in MW-2 (located in the area of the <br /> former USTs) during late fall and winter months However it has not been observed <br /> since February 1998 <br />' a BTEX contamination has been previously observed in deep-screened wells MW-102 <br /> and MW-202 but the wells were non-detect for the December event <br /> a The domestic wells associated with the site were non-detect for all constituents <br /> 1.0 GROUNDWATER MONITORING <br /> 1.1 Hydrology of Site <br /> 1.1.1 Horizontal Groundwater Gradients <br /> Water Table Wells <br /> The average water table elevation at the site on December 27, 2000 was 72 06 feet above <br /> mean sea level and the water table groundwater gradient was 0 0019 ft/ft flowing N34°E A <br /> review of the groundwater gradients shows that the dominant groundwater flow during the <br /> last two years is to the north-northeast with the slope ranging from 0 0015 up to 0 0023 ft/ft <br /> 1 Table 1 of Appendix A summarizes the water table groundwater gradients and levels to <br />{ date, and Figure 3 illustrates the historical groundwater directions and gradients <br /> Intermediate & Deep Wells <br /> The average groundwater elevation in the intermediate depth wells (MW-102, MW-105 & <br /> MW-107) for December was 71.98 feet above mean sea level and the intermediate depth <br /> groundwater gradient was 0 0016 ft/ft flowing N69°E <br /> Table 2 of Appendix A summarizes the intermediate depth groundwater gradients and levels <br /> to date Table 2 also summarizes the groundwater level data from the deep well, MW-202 <br /> The water table and intermediate groundwater gradients are included in Figure 2 <br /> I� <br /> 11.2 Vertical Groundwater Gradients <br /> Vertical groundwater gradients were calculated using MW-2 / 102 (shallow/intermediate <br /> well pair) and MW-102 / 202 (intermediate/deep well pair) During the December 2000 <br /> event the vertical groundwater gradient in the shallow/intermediate well pair was in an <br />