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Table 1. Compositional Concentrations for Alkali Bypass Dust at Holcim Portland Plant - 2014 (weight percent) <br />%%%%%%%%%% <br />SiO2 Al2O3 Fe2O3 CaO MgO SO3 Na2O K2O NaEq Cl <br />Average 15.4 4.2 1.98 46.89 1.33 4.95 0.43 5.14 3.81 8.1 <br />Median 15.71 4.25 2.03 47.25 1.33 4.46 0.4 4.7 3.6 5.84 <br />Std. Dev.1.61 0.47 0.22 6.35 0.07 2.24 0.14 2.09 1.5 3.31 <br />Maximum 18.11 5.21 2.43 60.94 1.62 11.25 1.01 12.64 9.14 19.3 <br />Minimum 9.64 2.58 1.18 29.68 1.11 1.37 0.19 1.45 1.14 1.68 <br />N 189 189 189 189 189 190 190 190 190 190 <br />N = sample count <br />Source: Holcim (US) Inc.