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%W4 <br /> Predicted Time to Water Quality Objectives in Well S-1 <br /> Shell-Branded Service Station,2494 East Fremont Street,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 /> Methyl Tertiary 1,2-Dichloroethane <br /> Constituent Butyl Ether(MTBE) (1,2-DCA) <br /> Given <br /> Water Quality Objective(WQO): y 5 0.5 <br /> Constant: b 3.16E+12 4.48E+12 <br /> Constant: a -5.98E-04 -6.36E-04 <br /> Starting date for current trend: 8/19/1998 5/5/2004 <br /> Calculate <br /> Attenuation Half Life(years): (-In(2)/a)/365.25 1 3.17 2.99 <br /> Estimated Date to Reach WQO: (x=ln(y/b)/a) May 2024 Jun 2028 <br /> t1,2-DCA �MTBE —Depth to Groundwater <br /> 10,000 40 <br /> MTBE=3.16E+12eZMEs . <br /> 1,000 m <br /> 2 <br /> a <br /> � 100 <br /> 50 v <br /> C <br /> ntt°� 10 7 <br /> � o <br /> 0 1 <br /> O 1,2-DCA=4.48E+12e-&36 9- O <br /> 0 60 <br /> 0 a C� 3�~ a�pry ash oc 3 �01 is) <br /> Date <br /> SHELL-BRANDED SERVICE STATION Sl:MTBE AND 1,2-DCA CONCENTRATIONS <br /> 2494 EAST FREMONT STREET AND DEPTH TO GROUNDWATER <br /> STOCKTON,CALIFORNIA eo�rooe.•novens <br /> 8a AS��CIATE3 <br />