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<br /> <br />Monitoring Report, 1997" by Western Historical Studies, Inc. <br />documents this monitoring. Future blasting will move further from <br />these sites, thus further reducing ground vibrations. <br />Dust Control <br />Dust control during construction consisted mainly of watering control using <br />the water wagon to spray roads and construction sites. In addition, the <br />permanent, unpaved roads were treated with Magnesium Chloride to help <br />retain moisture and minimize dust generation due to traffic. <br />As we enter the production phase of the project, several additional <br />measures are required. Dust is typically generated when the material is <br />crushed or dropped. No dusting typically occurs as crushed rock rides the <br />conveyor. First, there are dust collectors on each transfer point on the <br />crusher-conveyor system. Dust collectors function in a very similar <br />manner to a household vacuum cleaner with a fan and a permeable bag. <br />Several of these dust collectors have already undergone major revisions <br />to make them more effective. Changes such as additional skirting and <br />sealing has occurred to make the vacuum fan more effective in pulling in <br />the fugitive dust particles. These transfer points are now controlling <br />fugitive dust well. <br />another potential fugitive dust generation point is where the rock is <br />discharged from the stacker belt in to the material stockpile. This unit has <br />been designed to raise and lower across a 50 height to control the drop to <br />between 18 and 24 inches. In addition, a fogging spray has been added <br />at the stacker discharge. This combination appears to be very effective <br />even in dry conditions. <br />The crusher hopper received a special dust control measure, the large <br />metal building covering its entrance. This building allows a haul truck to <br />back into the hopper to dump its 100 ton payload while containing the <br />dust in the building. It is working very effectively. <br />Wind Sg_eed Monitoring and High Wind Closure <br />A recording anemometer is located at the mine site and a read out of wind <br />speed is available in the control room at the cement plant. This <br />anemometer has an alarm tied to it to alert the operator whenever <br />sustained winds exceed 30 mph. When this level is attained, loading and <br />hauling will cease {drilling and conveying can continue). No high wind <br />closures have occurred to date. <br />of <br />Residential noise standards of 55 decibels are required at the Special Use <br />Permit boundary. Engineering Dynamics Inc. measured noise at the mine <br />6 <br />