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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-8 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be' ===> x=ht(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 3.70E+06 <br /> Constant a -1.75E-04 <br /> Starling date for current trend: 8/6/2001 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 10.84 <br /> Estimated Date to Reach WQO: (x=In(y/b)/ a) Nov 2052 <br /> tTPHd —Depth to Groundwater <br /> 100,000 5 <br /> O <br /> E <br /> 5 <br /> 10,000 10 v <br /> a .. <br /> b C7 <br /> o <br /> o � <br /> U <br /> TPHd:y=4E+06e�' <br /> 1,000 15 <br /> ,,p9` �a+ ,ar far 1mt` 1xt` fat` �xr 1a'c 1'Dr 1 FIGURE <br /> Date C-14 <br /> Shell Stockton Terminal MW-8: <br /> 3515 Navy Drive 00 TPHd Concentrations and <br /> Stockton,California COM1IESTOCiA-ROVERS Depth to Groundwater <br /> &ASSOCIATES <br />