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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-25 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be" ===> x=In(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 NA NA <br /> Constant a NA NA <br /> Starting date for current trend: NA NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Below WQO Below WQO <br /> --MTBE -*-TBA —Depth to Groundwater <br /> 1,000.0 0 <br /> 100.0 3 O <br /> m & <br /> 0 10.0 6 <br /> m <br /> 0 <br /> v O <br /> G g <br /> U 1.0 9 w <br /> v <br /> A <br /> 0.1 12 <br /> �� a�Q~ arAry xr xr xrp^ ark zs� xs o ti ry <br /> lq�� FIGURE <br /> Date C-6^ <br /> Shell Stockton Terminal <br /> 3515 Navy Drive WT\ MW-2$' <br /> Stockton,California <br /> PF' MT3E and TBA Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />