Alpine Creek The quality of the water is excellent with a total dissolved solids content of less than 10 ppm. This sort of water purity is only achievable through the melting of snow or ice. The process of freezing water vapor into snow is a purification mechanism. Modern water vapor will commonly contain organic molecules and/or sulfurous compounds picked up from the atmosphere. When the water vapor is frozen, the regular atomic structure of the ice cannot accommodate these molecules and they drop out of the solution. When significant sulfurous compounds are accumulated, the rainfall can become acidic which in turn mobilizes various metals from the bedrock. Because most of the flow in Alpine Creek is derived from snow and ice melt, the opportunity to develop acid rain and the concomitant metals mobilization is eliminated resulting in very pure water. From a 1998 report for the FDA
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