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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-22 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e°" ===> 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): (-ln(2)/a)/365.25 NA NA <br /> Estimated Date to Reach WQO: (x=lnCv/b)/a) Below WQO Below WQO <br /> f MTBE --m-TBA —Depth to Groundwater <br /> 10,000 0 <br /> U <br /> 1,000 3 O <br /> a <br /> i m <br /> 0 100 6 b <br /> v <br /> c3 <br /> U 10 9\"�JV�N <br /> E <br /> a <br /> a, <br /> 0 <br /> 1 12 <br /> c� Ao pti A'1- �'' A� A5 d° A`t p`b Aq do titi titi <br /> far has tat` fat` tat` 1� fat` ,xr fat` far �a'r fat` far 1� FIGURE <br /> Date C-54 <br /> Shell Stockton Terminal_ <br /> 3515 Navy Drive L.7V� MW-22: <br /> Stockton,California MTBE and TBA Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />