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Mr Mike Infurna <br /> A M B R I A January 17, 2005 <br /> Groundwater Conditions <br /> Maximum historical TPHg concentration 5,300 pg/L(C-2, $122/1996) <br /> Maximum TPHg concentration(current) <50 gg/L <br /> Minimum TPHg concentration (current) <50 pg/L <br /> Maximum historical benzene concentration 100 µg/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 gg/L(C-2, 08122/1996) <br /> Maximum MTBE concentration(current) 150 pg/L(C-1) <br /> Minimum MTBE concentration(current) <2 pg/L <br /> FFIX <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 m monitonng wells C-1 and C-2 at 150 gg/L and 100 pg/L,respectively <br /> ANTICIPATED FIRST 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 /> • Cambria will submit a subsurface investigation workplan for additional down-gradient <br /> delineation of methyl tert-butyl ether(MTBE) <br /> 2 <br />