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Cieo4ka,TecwaInc Page 6 <br /> Groundwater Monitoring Report <br /> Project No 723 2 <br /> August 31, 2004 <br /> ' 2 MTBE <br /> • The wells contained MTBE concentrations ranging<1 — 308 ug/l <br /> 1 <br /> 3 Benzene <br /> ' • The shallow wells contained benzene concentrations ranging<0 3 - 680 ug/1 <br /> o The lughest level of benzene was detected in well MW-5 that is located cross <br /> gradient of the former dispenser island <br /> ' o Well MW-9 is clean and defines the up gradient extent of the plume <br /> o Down gradient well MW-8 contained 116 ug/1 benzene <br /> • The intermediate wells contained benzene concentrations ranging <0 3 - 14,900 <br /> ' ug/l <br /> o The highest level of benzene was detected in well MW-3 that is located in the <br /> core of the gasoline plume <br /> o Well MW-109 is clean and defines the up gradient extent of the plume <br /> o Down gradient well MW-108 contained 6010 ug/l benzene <br /> • The deep wells contained benzene concentrations ranging <0 3 - 8 ug/l <br />' o The highest level of benzene was detected in well MW-208 that is located <br /> clown gradient of the former dispenser island <br /> o Well MW-209 is clean and defines the up gradient extent of the plume <br /> The distribution ofgr oundwater 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 /> • Figure 4 illustrates the distribution of TPH-G in the shallow wells A localized high <br />' is centered in well MW-5 that attenuates to non-detectable levels in wells MW-7 & <br /> MW-9 The plume also attenuates to the east in the location of MW-8 <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 non-detectable levels in wells MW- <br /> 107 &MW-109 The plume also attenuates to the east in the location of MW-108 <br /> • Figure 6 illustrates the distribution of TPH-G 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 southwest and northwest locations of MW-209 &MW-207, respectively <br /> 1 <br />