4 Using Turner's workbook, estimate the “factor of safety” in treating the PG dispersion coefficients as representing 1-hr averages. Your supervisor asks you, “How conservative are they?” What's your answer? 4 Using Turner's workbook, estimate the “factor of safety” in treating the PG dispersion coefficients as representing 1-hr averages. Your supervisor asks you, “How conservative are they?” What's your answer?

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