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Predicted Time to Water Quality Objectives in Well 5-4-83 <br /> Shell-Branded Service Station,2494 East Fremont Street,Stockton,California <br /> y = b ea" ===' x=hi(y/b)/a <br /> where: y=concentration inµg/L a=decay constant <br /> b=concentration at time x x=time x in days <br /> 1,2-Diddoroethane <br /> Constituent (1,2-DCA) <br /> Given <br /> Water Quality Objective(WQO): y 0.5 <br /> Constant: b 2.96E+19 <br /> Constant: a -1.05E-03 <br /> Starting date for current trend: 5/5/2004 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 1.81 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/ a) Aug 2018 <br /> -W-1,2-DCA --Depth to Groundwater 1 <br /> 1,000.0 -- 40 <br /> 1,2-DCA=2.96E+19e-1.OEb - <br /> 100.0 45 <br /> a w <br /> m a <br /> 10.0 — -- 50 3 <br /> q <br /> 1.0 55 0 <br /> o � <br /> U v <br /> 0.1 - __T__ - 604§1 C1 <br /> P° ��A' ��Ab ��P^ tia, ��Sg ��yo tib~~ ��~ry ti3~� N> <br /> Date <br /> SHELL-BRANDED SERVICE STATIONS� �}� S-4-93:1,2-DCA CONCENTRATIONS AND <br /> 2494 EAST FREMONT STREET' "J' DEPTH TO GROUNDWATER <br /> SIOCKTON,CALIFORNIA CONBsrooa.novEres <br /> &ASSOCIATES <br />