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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 /> Maximum Constituent Concentration in pg/L (Well ID/Quarter) <br /> Groundwater First through Fourth Quarter 2008 <br /> ' Zones MTBE TBA TAME <br /> 190 3,500 150 <br /> ' Upper A zone EW-1 MW-1 UA MW-31LIA <br /> 3Q2008 1Q2008 1Q2008 <br /> 350 990 24 <br /> A zone MW-71A MW-68A MW-71 <br /> 4Q2008 3Q2008 40,2008 <br /> ' N.D. N.D. N.D. <br /> B zone All Wells AlI Wells All Wells <br /> 2008 2008 2008 <br /> Notes: <br /> T. N.D.=non-detect,concentrations were not detected above the laboratory method detection limit <br /> 2.pg/L=microgram per liter,equivalent to parts per billion(ppb) <br /> 3.1,2,3,4 02008=First,Second,Third,Fourth Quarter 2008 <br /> 4.Petroleum sheen noted in well prior to sampling <br /> ' 5.Measurable SPH noted in well prior to sampling <br /> Groundwater Concentration Trends <br /> The 2008 analytical data for dissolved petroleum hydrocarbon concentrations was <br /> consistent with historical data. Graphs of TPH-DRO,TPH-GRO, benzene and MTBE <br /> ' concentrations in groundwater versus time for wells MWA UA, MW-3UA, MW-4A, <br /> MW-5A, MW-6A, MW-7A, MW-13B, MW-22B, MW-23B, MW-24A, MW-25A, MW-26A, <br /> MW-27A, MW-28A, MW-29A, MW-30A, MW-31 A, MW-32A, MW-34UA, MW-35UA, <br /> MW-47A, MW-49A, MW-50A and MW-50B are included in Appendix F. Groundwater <br /> isoconcentration maps of the Upper A,A and B water bearing zone over the first, <br /> second and third quarters are included in Appendix I. Groundwater isoconcentration <br /> ' maps of the Fourth Quarter 2008 Monitoring and Sampling Event are included as <br /> Figures 7 through 10.A comparison of the first through fourth quarter of 2008 <br /> isoconcentration maps indicates generally stable or declining hydrocarbon plumes. <br /> ' Work Performed During 2008 <br /> ' Work performed at Chevron Bulk Fuel Terminal 100-1621 during 2008 included the <br /> following activities: <br /> Groundwater Monitoring and Sampling <br /> Quarterly monitoring and sampling was conducted in accordance with the MRP and <br /> ' CAO.Quarterly groundwater monitoring and sampling was conducted by G-R between <br /> March 3 to 5(First Quarter),June 9 to 10(Second Quarter), September 2 to 4(Third <br /> 15 of 17 <br />