Selected water-quality data for a coastal dunes aquifer near Coos Bay - Oregon, 1971 to 1983

Sources and causes of dissolved iron in water from a dune-sand aquifer near Coos Bay and North Bend, Oregon

“…Given the abundance of shell fragments in the southern part of the dunes, the deep water moving to well W44 probably passes through shell fragments upgradient of the well in the deep flow path, and in view of the high pH values, deep water in the northernmost well W60 probably passes through shell fragments upgradient of the well. (Dobberpuhl, 1985). To decrease dissolved iron concentrations, shallow water moving to the deep part of the aquifer must have sufficient residence time to dissolve calcite and precipitate siderite.…”