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Mr Mike Infuma <br /> C A M B R I A March 15, 2005 <br /> Groundwater Conditions <br /> Maximum historical TPHg concentration 5,300 pg/L (C-2, 812211996) <br /> Maximum TPHg concentration (current) <50 pg/L <br /> Minimum TPHg concentration(current) <50 pg/L <br /> Maximum historical benzene concentration 100 pg/L(C-2, 4/17/1992) <br /> Maximum benzene concentration(current) <0 5 pg/L <br /> Minimum benzene concentration (current) <0 5 pg/L <br /> Maximum historical MTBE concentration 2,100 pg/L (C-2, 08122/1996) <br /> Maximum MTBE concentration (current) 160 pg/l, (C-1) <br /> Minimum MTBE concentration (current) <0 5 pg/L <br /> Hydrocarbon Trends and Distribution <br /> No TPHg or benzene has been reported in any well during the past two quarters Methyl tent-butyl <br /> ether(MTBE)was detected in monitoring wells C-1 and C-2 at 160 pg/L and 24 pg/L,respectively <br /> 3 <br /> . ANTICIPATED SECOND QUARTER 2005 ACTIVITIES <br /> • G-R will collect groundwater samples from the site groundwater monitoring wells and <br /> prepare a monitoring report, <br /> • Cambria will prepare a quarterly status report <br /> M <br /> 2 <br />