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Fourth Quarter/Annual <br /> 2008 Groundwater <br /> ' ARCADIS Monitoring Report <br /> Chevron Bulk Fuel Terminal <br /> 100-1621 <br /> ' 22888 Kasson Road <br /> Banta, California <br /> ' Frequency Range of <br /> gConstituentof Detection Detected RWQCB Frequency of Concentration of <br /> Above the Concentrations wool Exceedances Exceedances in pg/L(Well ID),by Flow <br /> MDLin IL' Zone <br /> A Zone:400(MW-24A);2,400(MW-25A); <br /> 16/33 59-3,500 100 11/16 250(MW-32A)80(MW47A)(810(MW-50A); <br /> ' 510(MW-51A);200(MW-72A);200(MW-75A) <br /> B Zone, <br /> 220 MW-73B <br /> MTBE 13/33 0.6-350 5 4/13 A Zone: <br /> ' 99(MW-26A);26(MW-27A); <br /> 350(MW-71A);16(MW-72A) <br /> TBA 1/29 30 12 1/1 AZone, <br /> 30 MW-50A <br /> ' TAME 1/29 24 <br /> Notes: <br /> I.MDL=method detection limit <br /> 2.pg/L=microgram per liter,equivalent to part per billion(ppb) <br /> 3. RWQCB WOO=Regional Water Quality Control Board Water Quality Objectives as outlined in Cleanup <br /> and Abatement Order R5-2002-0718 <br /> 4.The Woo for benzene(0.14"IL)is less than the detection limit of 0.5 pg/L <br /> Groundwater Concentration Trends <br /> ' Separate phase hydrocarbons have historically been detected in wells MW-1UA, <br /> MW-3UA, MW-7A, MW-8A, MW-14A, MW-15A, MW-16 and MW-36UA through <br /> MW-42UA. During the fourth quarter of 2008, SPH was observed only in <br /> MW-38UA. <br /> Graphs of petroleum hydrocarbon concentrations versus time are provided in <br /> Appendix F.These figures indicate dissolved impacts are stable or declining in some <br /> locations; most notably at wells located near the down gradient site boundary, including <br /> MW-3UA and MW-47A,Appendix F(Figures 2 and 20, respectively). <br /> ' Isoconcentration maps of the A zone were prepared for TPH-DRO, MTBE and TBA; <br /> Figures 7, 8 and 9, respectively. Maps of the A zone indicate that TPH-DRO in <br /> groundwater is not defined and MTBE in groundwater is not defined to the north and <br /> ' northeast of the site. <br /> A concentration map of the B zone was prepared for TPH-DRO and is presented as <br /> ' Figure 10 of this report.TPH-DRO in B zone groundwater is not defined to the north, <br /> 9of17 <br />