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002885 Hydrologic, as well as demographic, economic, and land-use data, wIll be util- ized for a comprehensIve assessment of interactions between resource develop- ment and envIronmental quality (Environment Canada, 1975). Forecasting method- ologies couple available data inputs with quantitative techniques, or utilize descriptive or empirical methods (Rickert and others, 1975). For modeling applicatIons, current techniques will be revIewed. The method selected will reflect a balance of data requirements and other resource needs (Hines and others, 1975). Methodologies developed by the residuals-management analysis will assist the basin-assessment project staff in generating the residual loadings resulting from energy-resource development plans identified for the basin. Phase I of the basin assessment (see p. 2 and table 1) will provIde much of the background information for use in the second or assessment phase. The project staff of the basin assessment seeks to coordinate closely several work activities with other units of the U.S. Geological Survey and Federal, State, and local planning agencies. Related ongoing studies by the U.S. Geological Survey include the residuals-management analysis and land-use mapping of part of the Yampa River basIn, Personnel assigned to projects of the U.S, Geological Survey funded by the U,S. Bureau of Land Management, U.S. Environmental Protection Agency, and Colorado Department of Natural Resources are obtaining hydrologic data for the Yampa River basin. Two waste-management planning studies funded by the U.S. Environmental Protection Agency to fulfill requirements of Section 208 of P.L. 92-500 include the Colorado part of the Yampa River basin, and assessment work tasks of mutual interest to the U.S. Environmental Protection Agency and the U.S. Geological Survey are being car- ried out by direct collaboration. The recently completed draft environmental impact statement on northwest Colorado coal development also contains much pertinent hydrol09ic and coal-resource information (U.S. Bureau of Land Man- agement and U.S. Geological Survey, written commun., 1976). One topic area requiring technical expertise and knowledge not held wIthin the U.S, Geologi- cal Survey involves legal and institutional aspects of the Yampa River basin's water resources. This study component is being carried out, in part, with the Colorado State Engineer's office. Itemized Phase-I I coordinated work tasks for the Yampa River basin assess- ment and the regional residuals-management analysis are indicated in table 2. Six primary work activities have been identified (codes I I-A through II-F, table 2), with secondary breakdowns shown for the first three activitIes. The first four work activities identify a sequence in carrying out the basin as- sessment: (1) Energy-development proposal identification (work task II-A), (2) residual generatIon and loadings (work task I I-B), (3) selection and adap- tation of various environmental assessment techniques (work task I I-C), and finally, (4) evaluation of feasibil ity and various consequences with respect to environmental policies and economic considerations of each energy-develop- ment proposal (work task I I-D). This sequence conforms to the components for regIonal assessments (fig. 2), Data-gathering activities (work task I I-E) are included within each of the four work tasks. The final work task (I I-F) con- sists of documentation of the basin-assessment methodological applications and results. For each identified component of the work task in table 2, a tentative preliminary breakdown of efforts of the Yampa River basin-assessment project staff, the regional residuals-management analysis staff, and other entities is given. As indicated by the work-task components, the minimum basin-assessment 7