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' Fourth Quarter/Annual <br /> 2008 Groundwater <br /> ' ARCAUIS Monitoring Report <br /> Chevron Bulk Fuel Terminal <br /> 100-1621 <br /> ' 22888 Kasson Road <br /> Banta, California <br /> o Groundwater Flow direction in the B Zone was towards the north- <br /> northeast at an approximate horizontal hydraulic gradient of 0.001 tuft <br /> • Concentrations of petroleum hydrocarbon constituents detected during the fourth <br /> quarter of 2008 are generally consistent with the previous monitoring results <br /> • Compiled graphs of petroleum hydrocarbon concentrations versus time indicate <br /> dissolved impacts are stable and/or declining at several locations <br /> • The TBA/MTBE ration in A zone well MW-50A indicates that biotransformation of <br /> ' MTBE is occurring in the A zone <br /> 1 <br /> 13 of 17 <br />