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1 <br /> 4e0bgical recknics Inc Page 7 <br /> Groundwater Monitoring Report <br /> Project No 723 2 <br /> April 24,2006 <br /> ' The distribution ofg roundwater contaminants is summarized as follows <br /> (Note The tso(oncentration contours are generated utilizing the SURFER@ computer <br /> modeling program We recognize that computer generated contour maps do not provide the <br /> most accurate repreventation of what tv taking place in the field However, even hand- <br /> contoured map at best provide a shadow of reality Both need to be looked at as <br /> interpretation, not reality) <br /> ' 1 TPH-G <br /> • The Valentine (Castle Motors) shallow well TPH-G data for the I" quarter 2006 <br /> r groundwater monitoring event for site are included in Figure 4 A localized high is <br /> present to the vicinity of MW-5 & MW-6 that attenuates to the northwest, northeast <br /> and southwest locations of MW-7, MW-8 and MW-9, respectively <br /> r • Figure 5 illustrates the distribution of TPH-G in the intermediate wells A localized <br /> high is centered in well MW-3 that attenuates to the northwest, northeast and <br /> southwest locations of MW-107, MW-108 and MW-109, respectively <br /> ' • Figure 6 illustrates the distribution of TPH-G in the deep wells A broad plume front <br /> is present in wells MW-207 and MW-208 The plume attenuates to the northwest <br /> location of well MW-209 <br /> 2 MTBE <br />' • None of the wells sampled contained MTBE above the laboratory reporting limits and <br /> therefore contour diagrams were not produced EPA Method 8260B was utilized for <br /> this event <br />' • MTBE does not appear to be an issue at this site <br /> 3 Benzene <br />' • Figure 7 illustrates the distribution of Benzene in the shallow wells A localized high <br /> is centered in well MW-5 that attenuates to the northwest, northeast and southwest <br /> locations of wells MW-7, MW-8 and MW-9, respectively <br /> • Figure 8 illustrates the distribution of Benzene in the intermediate wells A localized <br /> high is centered in well MW-3 that attenuates to the west, northwest, northeast and <br /> southwest locations of wells MW-1, MW-107, MW-108 & MW-109, respectively <br />' • Figure 9 illustrates the distribution of Benzene in the deep wells A localized high is <br /> centered in well MW-208 and the concentrations attenuate to non-detectable levels in <br /> the northwest and southwest locations of wells MW-207 & MW-209, respectively <br />' The results of theroundwater sample analysis show the following <br /> g P Y g <br />' ❑ Review of the historic groundwater elevations show that groundwater levels experience <br /> seasonal fluctuations from the nud 1990s to spring 2000 but have been decreasing <br /> steadily with each seasonal cycle since spring 2000 However, this trend may be slowed <br />' by the higher than average precipitation experienced in the spring of 2005 <br /> I <br /> r <br />