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4 - 78 <br />4.7 AIR QUALITY <br />• As noted in the West Central Colorado Coal EIS, particulate air quality in the study area <br />ranges from 20 to 132 micrograms per cubic meter annual geometric mean as recorded at <br />sixteen state, rrwnicipal, and privately operated particulate sampling sites. In undeveloped <br />sections similar to the lease area, particulate concentrations range from 20 to 40 micrograms <br />per cubic meter. <br />A detailed air quality analysis determined that particulate concentrations in the Grand Valley <br />in areas away from any sources were approximately 40 micrograms per cubic meter annual <br />geometric mean (PEDCo 1977). The calculated first and second maximum 24-hour <br />concentrations were 130 and 112 micrograms per cubic meter, respectively. <br />There has been no measurement of carbon monoxide, hydrocarbon, nitrogen oxides, sulfur <br />dioxide, or other gaseous pollutant concentrations in the vicinity of the proposed mine. Motor <br />vehicle emissions along State Highway 139 which crosses the mine site would probably raise <br />concentrations of carbon monoxide, hydrocarbon, and nitrogen oxides slightly above <br />background or natural levels. <br />• Vsibility at the site ranges from less than one mile to approximately 100 miles throughout <br />the year. Averjge visibility is about 54 miles with greatest visibility occurring during spring and <br />summer months. <br />Ahigh-volume particulate sampler was established at the meteorological station described <br />above. Data collection is incomplete and has been discontinued pending relocation to site near <br />the mouth of Munger Canyon. <br />C~ <br />M~ Volume 1 4-29-96 <br />