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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-14 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be" ===> 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) (TTA) <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 --w-TBA —Depth to Groundwater <br /> 100.0 0 <br /> u <br /> 0 <br /> a 10.0 \A 6 <br /> � d <br /> i m <br /> o 'd <br /> 0 <br /> bo <br /> 1.0 12 0 <br /> a <br /> a <br /> " <br /> A <br /> 0.1 ,c, cc44 18 <br /> N°I � 01' Ory Y" Off` Y" Ob A^ Y- �' 10 titi 1ti <br /> FIGURE <br /> Date C-34 <br /> Shell Stockton Terminal <br /> 3515 Navy Drive lV1W-14' <br /> Stockton California MTBE and TBA Concentrations <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> &ASSOCIATES <br />