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' Colo ieaI Technia/a Page G g g 6 <br /> Groundwater Mointoring Report U <br /> Project No 723 2 <br /> February 28,2005 <br /> ' o Well MW-207 contained trace BTEX (0 3 —0 8 ug/1) and 228 ug/1 TPH-G for <br /> the first time since its installation This well usually defines the northerly <br /> extent of the plume <br /> o Well MW-209 contained trace BTEX (0 4 — 12 ug/1) for the first time since <br /> its installation This well usually defines the up gradient extent of the plume <br /> ' o Well MW-101 contained 167 ug/l TPH-G Tlus well intermittently contains <br /> contaminants <br /> 2 MTBE <br /> ' • The wells contained MTBE concentrations ranging<1 —250 ug/1 <br /> 3 Benzene <br /> ' • The shallow wells contained benzene concentrations ranging<0 3 - 340 ug/1 <br /> o The highest 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 was dry for the event but has consistently <br /> contained benzene <br /> • The intermediate wells contained benzene concentrations ranging <0 3 -- 15,500 <br /> ug/1 <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 defines the up gradient extent of the plume <br /> o Down gradient well MW-108 contained 6 5 ug/1 benzene <br />' • The deep wells contained benzene concentrations ranging <0 3 — 33 6 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 plume <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 />' • 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 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 /> 1 <br /> 1 <br />