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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-16 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be ===> x=InCv/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 /> WQC : y 210 <br /> Constant b 2.58E+09 <br /> Constant a -3.32E-04 <br /> Starting date for current trend: 11/18/1997 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/36525 5.72 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Oct 2034 <br /> -- -TPHd —Depth to Groundwater <br /> 1,000,000 0 <br /> TPHd:y=3E+09 -M' 8 U <br /> 100,000 O <br /> � m <br /> 3 16 v <br /> 0 10,000 <br /> t <br /> b c"a <br /> � S <br /> U 1,000 24 w <br /> Q <br /> 32 <br /> 100 <br /> 0. ti O ry <br /> FIGURE <br /> Date C-38 <br /> Shell Stockton Terminal MW-16: <br /> 3515 Navy Drive TPHd Concentrations and <br /> Stockton,California CotWERS Depth to Groundwater <br /> &ASSOCIATES <br />