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Predicted Time to Reach Water Quality Objective (WQO) in Well NIW4 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b eax ===> 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 /> Total Petroleum <br /> Hydrocarbons as <br /> Diesel <br /> Constituent (1'PHd) <br /> Given <br /> WQO: y 210 <br /> Constant b NA <br /> Constant a NA <br /> Starting date for current trend: NA <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Below WQO <br /> --*–TPHd —Depthto Groundwater <br /> 10,000 5 <br /> U <br /> O <br /> a 1,000 10 <br /> m <br /> Y <br /> A <br /> b <br /> b O <br /> ar�7 100' 15 U <br /> 0 8 <br /> U � <br /> a <br /> C� <br /> 10 20 <br /> FIGURE <br /> Date <br /> C-11 <br /> Shell Stockton Terminal ® NW-4:3515 Navy Drive <br /> Stockton,California - TPHd Concentrations and <br /> COMESTOGA-ROVERS Depth to Groundwater <br /> &ASSOOATES <br />