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GeabgkAI Techs da lnc Page 6 <br /> ' Groundwater Monitoring Report <br /> Project No 723 2 <br /> • March 21, 2005 <br /> ' Wells MW-7, MW-9, MW-109, MW-201 and MW-209 did not contain petroleum <br /> hydrocarbon contaminants above the laboratory reporting limits <br /> ' 1 TPH-GBTEX <br /> ' • The shallow wells contained TPH-G concentrations ranging <50— 16,000 ug/1 <br /> o The highest level of TPH-G 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 shallow plume <br /> o Down gradient well MW-8 contained 2500 ug/1 TPH-G <br /> • The intermediate wells contained TPH-G concentrations ranging <50 - 96,000 <br /> ug/1 <br /> o The highest level of TPH-G was detected in well MW-3 that is located in the <br /> vicinity of the former dispenser island <br /> ' o Well MW-109 is clean and defines the up gradient extent of the plume <br /> o Down gradient well MW-108 contained 1,600 ug/l TPH-G <br /> • The deep wells contained TPH-G concentrations ranging <50—290 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-207 contained TPH-G for the second consecutive event This well <br /> previously defined the northerly extent of the plume <br /> o Well MW-209 is clean and defines the up gradient extent of the deep plume <br /> 2 MTBE <br /> ' • None of the wells contained MTBE above the laboratory reporting limits (utilizing <br /> EPA Method 8260B) <br /> ' 3 Benzene <br /> • The shallow wells contained benzene concentrations ranging c0 5 - 200 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 contained 13 ug/1 benzene <br /> ' • The intermediate wells contained benzene concentrations ranging c0 5 — 14,000 <br /> ugli <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 18 ug/1 benzene <br /> ' • The deep wells contained benzene concentrations ranging c0 5 -- 17 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 is clean and defines the up gradient extent of the plume <br /> 4 Other gasoline constituents detected <br />