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South Hinsdale Response to Objections <br /> 12 July 2022 <br /> properties beyond that), and to the north (to the picnic area north of the river and <br /> residences and ranches to the north). Construction of berms (stockpiles of soil being <br /> saved for reclamation) will also act as sound barriers to the west. MSHA also regulates <br /> noise levels. In addition, operations at night (when sound carries more) are not proposed. <br /> Numerous noise surveys in recent years in Archuleta County and nearby areas <br /> demonstrate that normal truck and auto traffic on both gravel and paved roads generates <br /> significantly higher noise levels than nearby mining operations on a continuing basis. <br /> Noise impacts are mitigated by limiting hours, days, and seasons of operations — <br /> particularly excavation and processing of sand and gravel. <br /> See also Section 5.3.4 on traffic noise. <br /> 5.8 Air Quality/Emissions from Operations and Traffic <br /> Traffic-generated Dust: <br /> The major sources of dust from trucking is caused by dust on the road and speed. Strict <br /> adherence to tarping of materials with fines (#4 and #200 material, as in roadbase and <br /> speed limits reduces other sources of dust. Dust from the road itself from haul trucks is <br /> the same as dust from log and cattle trucks, large recreational vehicles (RVs), and heavy <br /> smaller traffic. It is best controlled by adherence to speed limits, proper placement, <br /> compaction, and maintenance of the roadbase wearing surface (CDOT class VI material), <br /> and proper application of magwater or other dust control agents. Reduction in gravel costs <br /> for the Counties and USFS will be able to provide more funds for purchase and application <br /> of such dust control chemicals. Following the speed limit with empty, deadheading trucks <br /> is particularly important. Haulers will be constantly reminded of speed and tarping <br /> requirements, and the operator will work with USFS law enforcement and both Counties' <br /> sheriff's officers to deal with scofflaws. <br /> Equipment-generated Odor. <br /> While there is an odor from diesel-fired equipment and vehicles, there is also an odor from <br /> farm and ranch equipment and operations, and from gasoline-fueled vehicles. In all cases, <br /> the odor is a brief and relatively low impact which is allowed by State law and which quickly <br /> disperses. Even in an area such as the South End, there are no significant impacts on the <br /> environment or health beyond that impact of air pollution from urban areas and more <br /> densely populated areas. <br /> Operations Emissions including Dust and Odor <br /> Colorado law prohibits off-site transport of dust (both point sources (from crushing and <br /> screening)and fugitive (from conveying, stockpiles, loading, and vehicle traffic)) in excess <br /> of 20 percent opacity. Various dust control measures (BMP) are used to control dust, <br /> including processing materials as soon as they are excavated to preserve moisture <br /> content of the pitrun, use of dust control agents such as magwater(already used on Piedra <br /> Road and Kleckner Lane), watering as necessary of disturbed areas, stockpiles, and <br /> materials being processed, and limits on activities (speed limits, curtailing operations <br /> during high-wind periods, etc.). <br /> Odors which may be generated by mining include evaporation of diesel and other volatile <br /> materials, emissions from freshly-disturbed earth, and diesel/gasoline engine emissions. <br /> These odors are rapidly dispersed by air movement and generally are not detectable off- <br /> site at mining operations. MSHA (Mine Safety and Health Administration) limits exposure <br /> to dust and other emissions which may potentially be of concern for safety and health for <br /> 5182-22-003 WASTELINE, INC. Page 78 of 107 <br />