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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-10 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e" ===> x=ln(y/b)/a <br /> where: y=concentration inµg/L a=decay constant <br /> b=concentration at time(x) x=time(x)in days <br /> Methyl Tertiary Tertiary Butyl <br /> Butyl Ether Alcohol <br /> Constituent (MTBE) (TBA) <br /> Given <br /> WQO: y 1,800 18,000 <br /> Constant b 5.91E+14 Stable trend <br /> Constant a -6.58E-04 Stable trend <br /> Starting date for current trend: 8/31/2006 Stable trend <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/W.25 2.88 Stable trend <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Apr 2010 J Stable trend <br /> --�–MTBE --m–TBA —Depth to Groundwater <br /> loo,000 ° <br /> MTBE:y=5.91E+14eassE-0ax <br /> 10,000 5 O <br /> a w <br /> m ro <br /> 3 10 b <br /> r 1,000 <br /> b J <br /> v o <br /> V 100 Last TBA 15 <br /> concentration not Q <br /> included in trend. <br /> 10 20 <br /> C° cP ¢` Ati ^SP A5 0° A� og °q do titi titi <br /> If far ti� lac tixr �a'` 1`dr 11'Dr 11"Ar 1'Dr 1'Dr 1� FIGURE <br /> Date C-22 <br /> Shell Stockton Terminals MW_10: <br /> 3515 Navy Drive ���,. MTBE and TBA Concentrations <br /> Stockton California CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />