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1 <br /> Geological?-"h 6lcs Inc Page 7 <br />' GrOUndWater Monitoring Report <br /> Project No 723 2 <br /> June 21, 2006 <br /> 1 o Well MW-109 defines the up gradient extent of the benzene plume (with 0 53 <br /> ug/1) <br />' o Down gradient well MW-108 contained 20 ug/1 benzene <br /> • The deep wells contained benzene concentrations ranging<0 5 —6800 ug/1 <br /> o The highest level of benzene was detected in well MW-208 that is located <br />' down gradient of the former dispenser island <br /> o Well MW-209 defines the up gradient extent of the benzene plume <br /> 5 Other gasoline constituents detected <br /> • Well MW-8 contained 4 5 ug/1 1,2 DCA <br /> • Well MW-108 contained 5 8 ug/l DIPE and 40 ug/l 1,2 DCA <br /> • Well MW-208 contained 42 ug/1 1,2 DCA <br /> The distribution of groundwater contaminants is summarized as follows <br />' (Note The Isoconcentration contours are generated utilizing the SURFER® computer <br /> modeling program We recognize that computer generated contour maps do not provide the <br />' most accurate representation of what is 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 2"d quarter 2006 <br />' groundwater monitoring event for site are included in Figure 4 A localized high is <br /> present in the vicinity of MW-5 that attenuates to the northwest, northeast and <br /> southwest locations of MW-7, MW-8 and MW-9, respectively <br />' • 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 localized high is <br /> present in well MW-8 that attenuates to the northwest and southwest locations of <br />' wells MW-207 and MW-209, respectively <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 /> 1 <br />