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r <br /> Predicted Time to Reach Water Quality Objectives (WQ ) in Well MW-6 <br /> Former Shell Station,1313 East Charter Way,Stockton,California <br /> i <br /> I <br /> y = be' ___> x=bt(y/b)/ <br /> where: y=concentration inµg/L a=decay constant <br /> b=concentration at time(x) x=time(x)in days <br /> 1,2- <br /> Dichloroeth e <br /> Constituent (1,2-DCA) <br /> Given <br /> WQO: y 5 <br /> Constant: b 5.41E+14 <br /> Constant: a -7.92E-04 <br /> xEF Starting date for current trend w,. x :1/,11/200 _ r •e-� z�{ * R itr , ` <br /> i3 <br /> Calculate <br /> Attenuation Half Life(years): (-1n(2)/a)/365:25 2.40 <br /> xi a s 8 I � � i � ,�- {��^Xk+""�r�a..al„s3,.:<aia�v:n� -i'Y,�• 'Y-!N`". .�._a �"." �� ,''".sy, r r. t -�.: <br /> Estimated Date to Reach WQO (x=ln(y/b)/ a) t',zt 'A <br /> N ,. <br /> -Z 1,2-DCA -Depth to Groundwater <br /> 100.0 18 <br /> 1,2-DCA:y=5.41 E+14e 7.92E-04x <br /> 00 <br /> =10.0bf <br /> 27 <br /> a 3 <br /> o ° <br /> a <br /> � o <br /> c C7 <br /> U 1.0 36 a <br /> m <br /> 0.1 1 45 <br /> ob <br /> 4c 1Dc l,c <br /> Date <br /> FORMER SHELL STATION6PMW-6:CONCENTRATIONS IN <br /> 1313 EAST CHARTER WAY GROUNDWATER AND DEPTH TO <br /> STOC'KTON,CALIFORNIA GROUNDWATER VERSUS TIME <br /> GONES'rOQL6-FU:17 RS <br /> S ASSOCIATES <br />