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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-11 <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 /> Gasoline <br /> Constituent (TPHg) Benzene <br /> Given <br /> WQO: y 210 46 <br /> Constant b 1.70E+07 1.23E+12 <br /> Constant a -2.40E-04 -5.99E-04 <br /> Starting date for current trend: 11/18/1997 1/25/2001 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 7.91 3.17 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Jan 2029 Sep 2009 <br /> �—TPHg tBenzene —Depth to Groundwater <br /> 100,000 0 <br /> TPHg:y=1.70E+07e-10sa <br /> 10,000 6 <br /> F <br /> i 1,000 12 <br /> 3 <br /> o <br /> M 100 18 C0 <br /> v <br /> V S <br /> U10 24 v <br /> A <br /> Benzene:y=1.23E+12e'5.sse-0a. <br /> 1 30 <br /> q5 <br /> IC) �' SS o3 05 p1 pq ti~ ti� <br /> If �'Ar �� '\� �� 1a. ,,,o ti� 1� 1� FIGURE <br /> Date C-^-14 <br /> rm <br /> Shell Stockton Teinal _�,. MW-11: <br /> 3515 Navy Drive TPHg and Benzene Concentrations <br /> � <br /> Stockton,California <br /> CONESTOGA-ROVERS and Depth to Groundwater <br /> B.ASSCCIATES <br />