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eh <br />ESPEY, HUSTON & ASSOCIATES, INC. <br />• <br />3.4.2 Nitrogen Oxides <br />In a short-term study near Hayden in 1972, a maximum 24-hour average <br />of NO concentration of 2 micrograms per cubic meter was measured. At other <br />x <br />locations in the region of northwest Colorado and adjacent portions of Utah and <br />Wyoming, total NO concentrations ranging from 4 to 34 micrograms per cubic <br />x <br />meter have been measured. Global background is normally assumed to be 15 <br />micrograms per cubic meter. No significant impact is expected from Northern Coal <br />Company's proposed mine activities. <br />3.4.3 Carbon Monoxide <br />Cazbon monoxide concentrations have been measured at the Ca and Cb <br />oil shale lease tracts. These have always been near the global background of <br />400 micrograms per cubic meter. No impact is anticipated for the proposed mine <br />• activities. <br />3.4.4 Non-Methane H9drocazbons <br />Non-methane hydrocazbon concentrations were assumed to be 50 <br />micrograms per cubic meter in the Northwest Colorado Environmental Impact <br />Statement (U.S. Depaztment of the Interior, 1976). Values slightly above this level <br />were measured at Ca and Cb oil shale lease tracts. No impact is expected to be <br />caused by the proposed coal mining. <br />3.4.5 Total Suspended Pazticulate <br />Total suspended particulate was monitored by the State of Colorado at <br />Meeker, Colorado, until 1977. The monitor has not been operated since; therefore, <br />ao current data aze available for this area. ~ <br /> <br />H-17 <br />