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Predicted Time to Reach Water Quality Objective (WQO) in Well NM-12 <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: V 210 <br /> Constant b 3.54E+09 <br /> Constant a -3.74E-04 <br /> Starting date for current trend: 5/30/2003 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 5.OS <br /> Estimated Date to Reach WQO: (x=1n(y/b)/a) Dec 2021 <br /> t TPHd —Depth to Groundwater <br /> 10,000 0 <br /> TPHd:y=4E+09e�� U <br /> O <br /> F <br /> 5 <br /> a v <br /> 0 1,000 <br /> 10 <br /> b � <br /> � 3 <br /> QC ry <br /> V y <br /> . Q <br /> 100 20 <br /> FIGURE <br /> Date C-26 <br /> Shell Stockton Terminal NM--12: <br /> 3515 Navy Drive ® TPHd Concentrations and <br /> Stockton,California OONESTOGA-ROVERS Depth to Groundwater <br /> &ASSOCIATES <br />