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TABLE <br /> SUMMARY OF DEGRADATION CALCULATIONS <br /> SHELL-BRANDED SERVICE STATION <br /> 2494 EAST FREMONT STREET <br /> STOCKTON,CALIFORNIA <br /> Maximum Current <br /> Concentration Concentration WQO Half Life Date to Reach Years to Reach <br /> Well Anal a (µg/L) (µg/L) (µg/L) (years) WQO WQO <br /> 5-1 TPHg 392,000 64,000 100 22.94 Nov 2226 213 <br /> Benzene 5,900 950 1 10.49 Aug 2114 100 <br /> MTBE 77 <50 5 3.17 May 2024 10 <br /> 1,2-DCA 740 79 0.5 2.99 Jun 2028 14 <br /> 5-1-85 1,2-DCA 94 3.6 0.5 3.09 Oct 2017 3 <br /> 5-3-84 1,2-DCA 48 1.2 0.5 2.61 Oct 2018 4 <br /> S-4 1,2-DCA 14 2.7 0.5 4.23 Feb 2022 8 <br /> S-4-83 1,2-DCA 130 0.94 0.5 1.81 Aug 2018 4 <br /> S-6 MTBE 100 11 5 4.48 Mar 2018 4 <br /> 1,2-DCA 8 1.5 0.5 2.41 Mar 2016 2 <br /> Notes and Abbreviations: <br /> TPI-Ig =Total Petroleum Hydrocarbons as Gasoline <br /> MTBE =Methyl Tertiary Butyl Alcohol <br /> 1,2-DCA =1,2-Dichloroethane <br /> WQO =Water Quality Objective <br /> µg/L =micrograms per liter <br />