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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 = be' ===> 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 8.12E+06 <br /> Constant: a -1.77E-04 <br /> Starting date for current trend: 3/29/1999 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 10.73 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Jul 2063 <br /> --o—TPHd —Depth to Groundwater <br /> 1,000,000 5 <br /> TPHd:y=8E+06e-�' <br /> E <br /> a 100,000 10 <br /> 3 <br /> G <br /> �G <br /> � O <br /> b 15 0 <br /> 10,000 <br /> Q <br /> 1,000 50 20 <br /> ti <br /> �Ilp1 ��A las has If �mr If FIGURE <br /> Date C—LO <br /> Shell Stockton Terminal MW-10: <br /> 3515 Navy Drive 09) TPHd Concentrations and <br /> Stockton,Cahfomia ooN64Toc,A-ROVERS Depth to Groundwater <br /> &ASSOCIATES <br />