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*104 <br /> Predicted Time to Water Quality Objectives in Well S-1 <br /> Shell-Branded Service Station,2494 East Fremont Street,Stockton,California <br /> y = b e' ===' 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 /> Constituent Gasoline(TPHg) Benzene <br /> Given <br /> Water Quality Objective(WQO): y 100 1 <br /> Constant: b 1.95E+06 1.44E+06 <br /> Constant: a -8.27E-05 -1.81E-04 <br /> Starting date for current trend: 11/20/2000 11/23/1998 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 22.94 1 10.49 <br /> Estimated Date to Reach WQO: (x=In(y/b)/a) Nov 2226 Aug2114 <br /> tTPfig tlicnzcnc —Depth to Groundwater <br /> 1.000,000 __-... - 40 <br /> TPHg=1.95E+06es.:�ras. <br /> 100,000 - 45 <br /> eo m <br /> 3 10,000 - 50 v <br /> o <br /> � o <br /> b (j <br /> 1,000 55 9 <br /> o <br /> O Benzene=1.44E+06e-r.areaasx O <br /> 100 60 <br /> 1 1 1 � 1�A~1 Ary��A� �� °~ �� ��p^ 1papa ,Jltio ��~~ ti�~ry s� <br /> Date <br /> SHELL,BRANDED SERVICE STATION S-1:TPHg AND BENZENE <br /> 2494 EAST FREMONT STREET CONCENTRATIONS AND DEPTH TO <br /> STOCKTON,CALIFORNIA oo� GROUNDWATER <br />