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TABLE 3 Probablity Distribution Selection Influential Parameter index Parameter Symbol Probability Distribution Type Parameters 1 Qe1 - Arsenic Lognormal ' = -7.76, ' = 0.39 2 Qe2 - Cadmium Lognormal ' = -7.73, ' = 1.06 3 Qe3 - Chromium Lognormal ' = -5.25, ' = 1.30 4 a-Chrom (VI) Normal = 0.06, = 0.015 5 Ts Uniform a = 318, b = 328 6 Vs Uniform a = 10.4, b = 15.6 7 Ta Uniform a = 278, b = 288 8 Vd Normal = 0.005, = 0.0025 9 Vw Normal = 0.1, = 0.05 10 ORf Normal = 0.47, = 0.047 11 ds Lognormal ' = -3.10, ' = 0.75 12 ED Lognormal ' = 2.24, ' = 0.58 13 EST Uniform a = 0, b = 100 14 pb Normal = 1550, = 175 15 BCFp Uniform a = 0.01, b = 0.05 16 IR Triangular a = 14, m = 22, b = 30 17 INRp Lognormal ' = -2.58, ' = 0.61 18 BW Normal = 71.5, = 17.0 19 CPF11 - Arsenic Uniform a = 4.4, b = 26.7 20 CPF21 - Arsenic Triangular a = 0, m = 1.75, b = 15.0 21 CPF12 - Cadmium Normal = 6.3, = 2.93 22 CPF13 - Chromium Triangular a = 10.5, m = 42.1, b = 295.2

Explanations: The above-listed probability distribution types are defined as follows: • Uniform [a. b] • Normal (, )   where: a = minimum value b = maximum value   where: = distribution mean = distribution standard deviation • Triagular [a. m. b] • Lognormal (', ')   where: a = minimum value m = most likely value b = maximum value   where: ' = mean of underlying normal distribution ' = standard deviation of underlying normal distribution