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1 <br /> Geological TecfmicsW Page 6 <br /> Groundwater Monitoring Report <br /> Project No 723 2 <br /> June 15,2004 <br /> o The highest level of TPH-G 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 29000 ug/I TPH-G <br /> ' • The deep wells contained TPH-G concentrations ranging <50 - 590 ug/l <br /> o The highest level of TPH-G was detected in well MW-208 that is located <br /> down gradient of the former dispenser island <br /> o Well MW-209 is clean and defines the up gradient extent of the plume <br /> o Well MW-101 did not contain petroleum hydrocarbon contaminants above <br /> the laboratory reporting limits for the first time in the investigation <br /> 2 MTBE <br /> • None of the shallow, intermediate or deep wells contained MTBE concentrations <br /> above the laboratory reporting limits <br /> • The gasoline oxygenate DIPE (di-isopropyl ether) was detected in wells MW-8, <br /> MW-108 and MW-208 at 2 0, 34 and 2 5 ug/l, respectively <br /> 3 Benzene <br /> • The shallow wells contained benzene concentrations ranging <0 5 - 1,000 ug/1 <br /> o The highest level of benzene was detected in well MW-5 that is located cross <br /> gradient of the foriner 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 73 ug/l benzene <br /> • The intermediate wells contained benzene concentrations ranging <50 - 17,000 <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 is clean and defines the up gradient extent of the plume <br /> o Down gradient well MW-108 contained 7800 ug/I benzene <br /> • The deep wells contained benzene concentrations ranging <0 5 - 21 ug/I <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 is clean and defines the up gradient extent of the plume <br /> 4 1,2 DCA and EDB <br />' • None of the shallow, intennediate or deep wells contained EDB concentrations <br /> above the laboratory reporting limits <br /> • The only shallow well containing 1,2 DCA was MW-8 (11 ug/1) <br />' • Intermediate wells MW-1 and MW-108 contained 0 84 and 65 ug/1 1,2 DCA, <br /> respectively <br /> 0 Deep well MW-208 contained 9 0 ug/1 1,2 DCA <br />