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GeolorcalTechnics Inc Page 2 <br /> Groundwater Monitoring Report <br /> Project No 425 2 <br /> February 9, 1999 <br /> o Floating product routinely detected in MW-2, which is located in the area of the former <br /> USTs <br /> o The contamination observed in MW-102 during 1997 and early 1998 has attenuated to a <br /> large extent Preliminary natural biological degradation analyses indicate that the <br /> groundwater at this aquifer horizon is in higher state of oxidation compared to the <br /> shallow aquifer and the deeper zones This may attribute to rapid attenuation of the <br /> gasoline over the past 2 years <br /> 0 The contamination observed in MW-202 has started to attenuate However, the <br /> preliminary natural biological degradation analyses indicate that the groundwater at this <br /> aquifer horizon may be in higher state of reduction compared to the intermediate depth <br /> It is recommended that <br /> o Future monitoring include a complete natural attenuation parameter analysis <br /> o This site be evaluated for the need of source removal to provide needed protection to <br /> public health and the environment <br /> 10 GROUNDWATER MONITOWNG <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 was 73 37 feet above mean sea level The water <br /> table groundwater gradient was 0 0017 ft/ft flowing N39°E A review of the groundwater <br /> gradients show that the dominant groundwater flow is in a northern direction with the slope <br /> ranging from 00012 up to 0 0289 ft/ft The gradient direction for this event and the May 29, <br /> 1998 were more easterly then has been observed at the site in the past This may be a result <br /> of having the entire site surveyed into a common plane Table 1 of Appendix A summarizes <br /> the water table groundwater gradients and levels to date <br /> Intermediate Delth Wells <br /> The average groundwater elevation in the intermediate depth wells (MW-102, MW-105 & <br /> MW-107) was 73 30 feet above mean sea level The intermediate depth groundwater <br /> gradient was 0 0018 ft/ft flowing N60°E This is the first event when a gradient has been <br /> calculated from the intermediate depth wells Table 2 of Appendix A summarizes the <br /> intermediate depth groundwater gradients and levels to date Table 2 also summarizes the <br /> groundwater level data from the deep well, MW-202 <br /> Figure 2 is a map showing both the water table and intermediate groundwater gradients <br />