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�6 y <br /> Table A- Summary of Degradation Rate Calculations <br /> Former Shell Station,1313 East Charter Way, Stockton,California <br /> " x <br /> Maximum Concentration Current Concentration Half-Life " WQO Date to Reach Years to Reach <br /> Well Analyte (ug/L) (ug/L) (years) A (ug/L) WQO WQO <br /> MW-1 TPHg 4,900 780 3.73 ..,; 100 Oct 2023 12.8 <br /> Benzene 390 130 3.31 1 Jun 2031 20.4 (' <br /> MW-6 1,2-DCA" 360 <0.50 2.40 5 Oct 2011 0.7 <br /> Abbreviations: <br /> TPHg = Total Petroleum Hydrocarbon as Gasoline ` <br /> 1,2-DCA = 1,2-Dichloroethane <br /> ug/L = Micrograms per liter <br /> WQO = Water quality objective <br /> �nra linlineshp�Q theestimated beginning of the downward trend <br /> h <br /> • M _ i I <br /> �z.� ice» .• :�4:ri�....o.:'.-.....ez- . <br /> T <br /> a <br />