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cwtogka'Techhks 1/te Page 7 ' Groundwater Monitoring Report Project No 723 2 • March 21,2005 ' • Well MW-5 contained 9 7 u 1,2 DCA ' • Well MW-7 contained 17 ug/1 TBA Well MW-108 contained 49 ug/1 DIPE, 61 ug/1 TBA and 32 ug/l 1,2 DCA The distribution of groundwater contaminants is summarized as follows (Note The Isoconcentration contours are generated utilizing the SURFER® computer ' modeling program We recognize that computer generated contour maps do not provide the most accurate representation of what is taking place in the field However, even hand- contoured map at best provide a shadow of reality Both need to be looked at as ' interpretation, not reality} 1 TPH-G ' • GTI staff accessed the GeoTracker database and retrieved the latest data for groundwater sampling at the Shell station (see Appendix D) The Valentine (Castle Motors) shallow well TPH-G data for the lit quarter 2005 groundwater monitoring ' event for site are included in Figure 4 A localized high is centered in well MW-5 that attenuates to the cast in the location of MW-8 The adjacent site's monitoring well locations, TPH-G and MTBE data from their July 2004 event are included on the right side of Figure 4 • Figure 5 illustrates the distribution of TPH-G in the intermediate wells A localized high is centered in well MW-3 that attenuates to non-detectable levels in up gradient well MW-109 The plume also attenuates to the north and east locations of wells MW-107 &MW-108, respectively ' • Figure 6 illustrates the distribution of TPH-G in the deep wells A localized high is present in well MW-207 that attenuates to non-detectable levels in cross gradient well MW-209 The plume also attenuates to the east location of well MW-208 ' 2 MTBE • None of the wells contained MTBE and therefore contour diagrams were not produced EPA Method 8260B was utilized for this event ' • MTBE appears not to be an issue at this site 3 Benzene • Figure 7 illustrates the distribution of Benzene in the shallow wells A localized high ' is centered in well MW-5 that attenuates to the southwest, northwest and east locations of wells MW-9, MW-7 and MW-8, respectively • Figure 8 illustrates the distribution of Benzene in the intermediate wells A localized ' high is centered in well MW-3 that attenuates to the southwest, west and northwest locations of wells MW-109, MWA & MW-107, respectively The plume also attenuates to the east in the location of MW-108 ' • Figure 9 illustrates the distribution of Benzene in the deep wells A localized high is centered in well MW-208 and the concentrations attenuate to non-detectable levels in the southwest and northwest locations of wells MW-209 &MW-207, respectively t