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emission limits (which are more strict than EPA limits). Model <br />• emission levels are based on data from operating trucks <br />throughout the country which are not so stringently maintained. <br />With increased production, trucking is scheduled to increase during <br />f <br />evening hours. During evening operations, drivers should be instructed <br />to minimize excessive acceleration and use of the "joke" brake. Since the <br />4. trucks are equipped with retorter brakes,this should be facilitated. <br />I~" <br />~. <br />i. <br />L.: <br />In summary, conservative model predictions indicate that increased <br />r <br />~ production at the Orchard Valley Mine will result in a slight (3 to 4 d6) <br />~ increase in Ldn noise levels in adjacent areas. At no residence will the <br />65 dBA standard adopted by many agencies be exceeded. Efforts should be <br />;-• made by Savage Brothers drivers to minimize noise emissions during evening <br />hours. <br />F': <br />AIR QUALITY <br />k„ <br />~ In 1977 an analysis of the air quality impacts of the Orchard Valley <br />Mine operation was prepared far Thorne Ecological Institute by Marlatt and <br />Associates. The results were documented in the 1977 report "Climate and <br />Air Quality Baseline Analysis and Impact Evaluation for Colorado Westmoreland <br />Inc.". In that report, the authors indicated that there was a need to assess <br />~; <br />L• operational impacts on total suspended particulate (TSP) concentrations only. <br />r' They also concluded that at a 650,000 tan per year production level that the <br />~J Colorado Westmoreland operation significantly contributed to particulate <br />levels only within the airshed defined as upper Stevens Gulch and contributed <br />`• four percent or less of particulate levels in the adjacent 'forth Fork valley <br />- area. <br />-25- <br />