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002S72 Stream-Quality Reconnaissance Samples were collected for determination of selected water-qual ity con- stituents by U.S. Geological Survey personnel at 85 sites visited during a 2-week stream-quality reconnaissance survey of the Yampa River basin in August and September 1975. Thirty of these reconnaissance sites are scheduled for quarterly sampling by Survey personnel during Phase II of the project for a monitoring period of 12 months beginning in December 1975. Another two of these reconnaissance sites plus an additional 10 sites are to be sampled by U.S. Forest Service personnel on the same schedule. The 85 stations designat- ed for collection of reconnaissance data during August and September 1975 are indicated on figure 2. All 95 reconnaissance or monitoring sites sampled as part of the basin assessment are listed in table 2. The monitor code for each station indicates those reconnaissance stations in the basin and supplemental stations in Routt County for which continuing data are to be collected. Of the total 85 reconnaissance sites, major inorganic ions were measured at 30 stations during the August-September 1975 survey. These 30 sites in- clude 18 of the sites in the lorns and others (1964) survey, which was made from 1947 to 1958, plus 12 additional sites. Other data were collected, as defined elsewhere, at the remaining 55 sites sampled by U.S. Geological Survey personnel during August-September 1975. Of the 85 U.S. Geological Survey sites, 12 are primary-control sites (should show no effect from upstream use); 11 are secondary-control sites (de- signed as controls, but may show some upstream effects); 31 are potentially affected by municipal sewage or by mining and related activities; and 31 are of a miscellaneous nature (designed primarily so that no major tributary drain- age is overlooked). Twenty-one of the sites were visited previously in 1972 during a statewide mine-drainage survey (Moran and Wentz, 1974); 15 sites are active U.S. Geological Survey stream-gaging stations. Four of the 85 U.S. Geological Survey sites were selected by the U.S. Environmental Protection Agency; whereas, 14 others were established or have been proposed for the four "coal-mining priority areas" as a part of the U.S. Bureau of Land Management's Energy Mineral Rehabilitation Inventory and Analysis (EMRIA) program. Tenta- tively, station operations at these latter 18 stations, when implemented, will be funded by the above agencies and operated by the U.S. Geological Survey. Selection of the 85 U.S. Geological Survey sites was coordinated with representatives of U.S. Environmental Protection Agency, Region VI II, Surveil- lance and Analysis Division and Water Planning Office; Colorado West and North- west Councils of Governments (Regions XI and XI I, respectively); and planning commissions for Routt and Moffat Counties. A total of 55 sites are included in some form of continuing data-collec- tion program for the duration of the assessment project (see table 2). A breakdown of these sites is as follows: (1) 26--Assessment project, (2) 4-- Routt County, (3) 12--U.S. Forest Service, (4) 2--NASQAN, (5) 4--U.s. Environ- mental Protection Agency cooperative program with the U.S. Geological Survey, and (6) 7--U.S. Bureau of Land Management cooperative program with the U.S. Geological Survey. 9 ;io