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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-20 <br /> Shell Stockton Terminal,3515 Navy Drive,Stockton,California <br /> y = be" ===> x=in(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 1.92E+06 <br /> Constant: a -1.98E-04 <br /> Starting date for current trend: 10/28/1996 <br /> Calculate <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 9.58 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) Jan2026 <br /> -9-TPHd —Depth to Groundwater <br /> 10,000 5 <br /> TPHd:y=2E+06e-z - <br /> O <br /> F <br /> a <br /> � d <br /> 00 <br /> i m <br /> 0 1,000 10 <br /> qV V� M � nqld <br /> I � <br /> �y o <br /> a <br /> U S <br /> v <br /> Q <br /> 100 15 <br /> xr ar ary aC ar ~ ark arph as� �� �''r <br /> ti 1 1 1 ti 1 1 S 1 1 ti � FIGURE <br /> Date C-46 <br /> Shell Stockton Terminal MW-20. <br /> 3515 Navy Drive ( 1�7�yf- TPHd Concentrations and <br /> Stockton,California <br /> CONESTOGA-ROVERS Depth to Groundwater <br /> &ASSOCIATES <br />