Water quality and hydrologic data were collected as part of a study of the effects of acid precipitation on stream water quality in two watersheds in central Massachusetts, conducted by the U.S. Geological Survey from November 1983 through September 1985. The two watersheds, West Branch Swift River (12.7 square miles) and East Branch Fever Brook (4.85 square miles), located north of Quabbin Reservoir, differ in surficial geology and hydrologic characteristics. Data are reported on precipitation quality and quantity and streamflow quality and quantity at the outlet of each watershed and at several tributaries. Also reported are the quality of soil water and ground water, chemistry of soil leachates, and mineralogical analyses of the clay-sized fraction of watershed soils. A sample site numbering system for surface water and ground water was used to identify, record, organize, and track sample analyses. Eight-digit station numbers were assigned to each surface-water gaging station and surface-water sampling site. These numbers were assigned in downstream order. CO LECTION AND COMPUTATION OF DATA Wet deposition was collected weekly, using an Aerochem-Metrics1 Model 301 wet/dry deposition sampler. The sampler was operated on private Use of brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.

A study was performed to identify sources of solute loading to the Dirty Devil River and its major tributaries, in southeastern Utah. A primary goal was to determine the contribution of gypsum dissolution to total dissolved solids concentration, and its potential increase in the future if salinity control measures are instituted. Synoptic field data were collected during the low flow period in October 1983. Data were analyzed using the geochemistry models WATEQF and BALANCE to postulate mineral reactions leading to solute loading. Three known sources of solute loading, involving two different geochemical mechanisms, were clearly discernable. Two additional areas of possible gypsum dissolution were located. (KEY TERMS: salinity; geochemistry models; salinity control; Colorado River Basin.)

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