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Additional Parameters That May Be Of Interest To Our Customers <br /> PHG Imported Water Ground Water <br /> <br /> Parameter MCL MCLG Typical Source of Contaminsnt <br /> ~ ( ~ Range Average Range Average <br /> i Erosion of natural deposits; residual from <br /> Perchlorate (ppb) NA NA i ND - 4.1 ND ND - 3.0 0.2 <br /> j some surface water treatment processes <br /> 1,4-Dioxane (ppb) NA NA I ND ND i ND ND r Runoff/leaching from natural deposits; <br /> t <br /> seawater influence ' <br /> _ _A _ _ _....1_ __.-1._ _ . <br /> 75C-18 <br /> <br />