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Mr Mike Infurna <br /> A M B R I A August 30, 2005 <br /> Maximum Groundwater Concentrations <br /> Maximum historical TPHg concentration 5,300 gg/L(C-2, 812211996) <br /> Maximum historical benzene concentration 100 pg/L(C-2, 4/17/1992) <br /> Maximum historical MTBE concentration 2,100 µg/L(C-2, 08/2211996) <br /> Current Groundwater Concentrations(7/23/05) <br /> Ethyl- <br /> Well ID TPHg Benzene Toluene benzene Xylene MTBE <br /> C-1 <50 <0 5 <0 5 <0 5 <0 5 0 7 <br /> C-2 86 <0 5 <0 5 <0 5 <0 5 59 <br /> • C-3 <50 <0 5 <0 5 <0 5 <0 5 <0 5 <br /> Hydrocarbon Trends and Distribution <br /> No benzene has been reported in any well during the past four quarters TPHg is only reported in C-2 <br /> at 86µg/L Methyl tert-butyl ether(MTBE)was detected in monitoring wells C-1 and C-2 at 0 7 pg/L <br /> and 59 µg/L,respectively <br /> ANTICIPATED FOURTH QUARTER 2045 ACTIVITIES <br /> • G-R will collect groundwater samples from the site groundwater monrtonng wells and <br /> prepare a monitoring report, <br /> • Cambria will prepare a quarterly status report,and <br /> • Upon receipt of access agreements, Cambria will proceed with obtaining the proper <br /> drilling permits and install three soil bonngs with depth discrete groundwater samples for <br /> vertical and lateral groundwater delineation <br /> • <br /> 2 <br />