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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 ea" ===> 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 /> Total Petroleum <br /> Hydrocarbons as <br /> Gasoline <br /> Constituent (TPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant b Stable trend Stable trend <br /> Constant a Stable trend Stable trend <br /> Starling date for current trend: Stable trend Stable trend <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 Stable trend Stable trend <br /> Estimated Date to Reach WQC: (x=ln(y/b)/a) Stable trend Stable trend <br /> 1,000,000 -11--TPHg Benzene —Depth to Groundwater <br /> 0 <br /> 100,000 5 O <br /> a _ E <br /> 10,000 to v <br /> 0 <br /> u IIt(// C7 <br /> CJ 1,000 15 .y <br /> a <br /> a <br /> A <br /> 100 20 <br /> e � <br /> ')o FIGURE <br /> Date <br /> C-21 <br /> Shell Stockton Terminal n'1W-10: <br /> 3515 Navy Drive <br /> Stockton,Califomia TPHg and Benzene Concentrations <br /> conlesTOGta-novIEts and Depth to Groundwater <br /> &ASSOCIATES <br />