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<br />D1I2H3 <br /> <br />Is being coordinated with the U.S, Environmental Protection Agency (Ron Eddy, <br />written commun, , 1975), is an attempt to supply information for use In the <br />U,S. Environmental Protectiqn Agency 208 area waste-treatment management study <br />under the auspices of the Northwest Colorado Council of Governments (Gordon <br />Butcher, written commun" 1975), <br /> <br />Ai r Qua I ity <br /> <br />Due to the present low level of industrial development in the Yampa ba- <br />sin, air~quality problems are currently only minor and localized, With the <br />anticipated growth of energy-related activity In the basin, however, possible <br />increased effects on air quality need to be considered, <br /> <br />Because a ttent i on in the bas i n asses sment is focused on future preva i,l i ng <br />levels of air qual ity, rather than day-to-day fluctuations, a steady-state <br />air-dispersion model is appropriate for the analysis. A number of such models <br />are availaBle and mos.t are based on'solutions to various forms of the Gaussian <br />plume equation, Specific forms of the plume equation have been expressed for <br />power or gasification plants, highways and roads, and strip, mines and reclam- <br />at i on areas. <br /> <br />Two steady-state models have recently been developed for northwestern <br />Coloradonone in conjunction with a University of Colorado study by Kreider <br />(1975), and the other by Environmental Resources and Technology, Inc" as part <br />of an environmental impact study of mining activity (U,S, Bureau of Land Man- <br />agement and U,S. Geological Survey, written commun, , 1976). In applying ex- <br />isting models to the present study of the Yampa River basin, certa,inmodifica- <br />tions will be necessary, <br /> <br />The regional air-quality model will be used to predict dispersion of sev- <br />eral different pollutants generated in primary as well as secondary levels of <br />energy development in the Yampa River basin, These include: <br /> <br />a. Suspended particulates, <br /> <br />b, Sulfur-oxide species (SO), <br />x <br />c. Nitrogen-oxide species (NO ), and <br />x <br />d, Hydrocarbons, carbon monoxide, <br /> <br />Air-qual ity monitoring installations are located in the towns of Craig, <br />Hayden, and Steamboat Springs. These should provide data for model verifica- <br />tion and are included within a state-wide air-quality system maintained by the <br />Colorado Department of Health (Wayne May, written commun" 1975), These sta- <br />tions currently monitor suspended particulates, an air pollutant of special <br />importance in coal-related activities. <br /> <br />Adaptation and application of a selected air-quality model initially are <br />assigned to the systems-analysis group for coordination with the basin assess- <br />ment (see table 2). Alternatively, a reduced air-quality simulation activity <br />will b~ performed, <br /> <br />23 <br />