Laserfiche WebLink
Geologuat 7"echAks Inc Page 7 <br /> Groundwater Momtoring Report <br /> Project No 723 2 <br /> October 25, 2005 <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 defines the up gradient extent of the benzene plume <br /> o Down gradient well MW-8 was dry but has routinely contained 6 4 — 73 ug/l <br /> benzene <br /> ' • The intermediate wells contained benzene concentrations ranging c0 5 — 13,600 <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 defines the up gradient extent of the benzene plume <br /> o Down gradient well MW-108 contained 14 5 ug/l benzene <br /> 9 The deep wells contained benzene concentrations ranging c0 5 — 19 7 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 /> ' 4 Other gasoline constituents detected <br /> e Well MW-2 contained 268 ug/l 1,2 DCA <br /> Y Well MW-108 contained 7 1 ug/l DIPE, 47 7 ug/l 1,2 DCA <br /> • Well MW-201 contained 0 5 ug/l 1,2 DCA <br /> The distribution of groundwater contaminants is summarized as follows <br /> 1 (Nate 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 3rd quarter 2005 <br /> groundwater monitoring event for site are included in Figure 4 A localized high is <br /> centered in well MW-5 that attenuates to the northwest and southwest locations of <br /> ' MW-7 and MW-9, respectively Well MW-8 historically has less TPH-G also <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 down gradient well MW-208 that attenuates to the northwest and southwest <br /> ' locations of well MW-207 and MW-209, respectively <br />