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Predicted Time to Reach Water Quality Objectives (WQO) n Well N1W 1 s <br /> Former Shell Station,1313 East Charter Way,Stockton,California <br /> y = b eax =__> x=ln(y/b)/ a <br /> where: y=concentration in gg/L a=decay constant <br /> b=concentration at time(x) x=time(x)in days <br /> Total Petroleum <br /> Hydrocarbons as <br /> Constituent Gasoline(TPH ) Benzene <br /> Given <br /> WQO: y 100 1.0 <br /> Constant: b 9.75E+11 9.24E+11 <br /> Constant: a -5.09E-04 -5.74E-04 <br /> F Starting date for current trend: n f -.9/27/2007.° ­'9/27/2007if <br /> Calculate :s. <br /> Attenuation Half Life(years): (-ln(2)/a)/365.25 3.73 <br /> r �Il� fi € v <br /> .Estimated Date"to"lZeach WQO: (x-hl(y/b)"/a} ?+.�" Oct 2023 . Jun 2031 + ip+,-}4. <br /> —F-1PHg 0 Benzene Depth to Groundwater <br /> 10,000.0 26 <br /> TPHg:y=9.75E+11es'09sa` <br /> 1,000.0 30 <br /> ea <br /> � v <br /> °D 100.0 34 3 <br /> g <br /> o Benzene:y-9.24E+11e'574E-04' 7� <br /> 71- <br /> 10.039 .2 <br /> 0 <br /> 1.0 42 <br /> 0.1 46 <br /> far lar lac bac far.. ;ar ;aq bac lar <br /> Date <br /> FORMER SHELL STATION MW-1:CONCENTRATIONS IN GROUNDWATER <br /> 1313 EAST CHARTER WAY AND DEPTH TO GROUNDWATER VERSUS <br /> STOCKTON,CALIFORNIA &P TIME <br /> CON 434GA-ROVERS <br /> B.ASSOCIATES <br />