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Predicted Time to Reach Water Quality Objective (WQO) in Well MW-37 <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 NA <br /> Constant a NA <br /> Starting date for current trend: NA <br /> Calculate <br /> Attenuation Half Life(years): (-1n(2)/a)/365.25 NA <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Stable Trend <br /> tTPHd —Depthto Groundwater <br /> 10,000 0 <br /> O <br /> a 1,000 5 <br /> i <br /> m � <br /> .3 3 <br /> o v <br /> n <br /> m <br /> b o <br /> u 100 10 9 <br /> U p, <br /> v <br /> A <br /> 10 15 <br /> O ` L h <br /> FIGURE <br /> Date C-67 <br /> Shell Stockton Terminal ,. �= MW_37. <br /> 3515 Navy Drive 1�7Y., TPHd Concentrations and <br /> Stockton,California <br /> COf ASSM_ROVERSi Depth to Groundwater <br /> & <br /> &ASSOCIATES <br />