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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-15 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = b e" ===> 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 /> Diesel <br /> Constituent (TPHd) <br /> Given <br /> WQO: y 210 <br /> Constant b 1.59E+11 <br /> Constant: a -4.34E-04 <br /> Starting date for current trend: 6/15/1995 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 4.37 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Dec 2028 <br /> t TPHd —Depth to Groundwater <br /> 1,000,000 0 <br /> 100,000 5 <br /> O <br /> m 10,000 10 v <br /> v R <br /> O V <br /> G <br /> c 1,000 15 0 <br /> a � <br /> C O <br /> U 100 20 a <br /> A <br /> TPHd:y=2E+lle'} - <br /> 10 i 25 <br /> '?;'FIGURE <br /> Date C-35 <br /> Shell Stockton Terminal �`tMW-15: <br /> 3515 Navy Drive Th <br /> Stockton,California TPHd Concentrations and <br /> contesrocp_rt HERS Depth to Groundwater <br /> &ASSOCIATES <br />