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CNAPTERTHREE Environmental Consequences 3.5.2 Unavoidable Adverse Impacts Some unavoidable adverse impacts would remain under the Agency Preferred Alternative. Some air pollutants would be emitted and would contribute to the pollutant loading in the region. These, however, would not cause any exceedance of the National or Colorado Ambient Air Quality Standazds or of increments established to prevent significant deterioration of the existing air quality. These impacts were described for the Proposed Action. There would also be some contribution to the fine particulate in the region, which can contribute to an increase in regional haze and a reduction of visual range. The contribution resulting from this project, however, is expected to be localized and not to have a significant effect on the federally protected pazks and wilderness azeas (federal PSD Class I azeas). 3.6 NOISE 3.6.1 Direct and Indirect Impacts Piceance Site Sources of duect and indirect impacts of construction and operational noise under the Agency Preferred Alternative would be the same as described for the Proposed Action. Section 4.6.2.1 of the Draft EIS (page 4-35) has been modified to address the effects of drilling and truck transportation in more detail. Pipeline Corridor Sources of direct and induect impacts of construction and operational noise under the Agency Prefeaed Alternative would be the same as described for the Proposed Action. Parachute Site Sources of direct and indvect impacts of construction and operational noise under the Agency Preferred Alternative would be the same as described for the Proposed Action, except for the proposed reactivation of the rail spur for hauling construction-related equipment and supplies to the Parachute Site. The following assessment ofrail-associated noise was presented to Garfield County as part of American Soda's Special Use Permit application. The noise study is based on review of existing studies performed on various railroad operations and is representative of noise impacts to be associated with the American Soda's rail spur operations. The assessment applies to train activity during construction or operation under the Proposed Action and Agency Preferred Alternative. Trains moving at 20 mph and 50 mph generate noise levels of approximately 71 to 72 dB(A) and 80 dB(A) at a distance of 50 feet, respectively. Trains associated with the American Soda rail spur would travel at a maximum speed of 10 mph. Therefore, moving train noise would be less than 71 dB(A) at a distance of 50 feet. The state noise standard classifies railroad operations as Noise 3-7