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Staff Recommendation <br /> Docket #SU-81-10 <br /> November 13, 1981 <br /> Page 12 <br /> Maximum Standard for Stockpiled Material <br /> As noted under the discussion of noise impacts, the alternate mining plan <br /> with the operations area located on the eastern side of the property will <br /> utilize stockpiles for additional sound level attenuation. Due to the <br /> location of the processing plant on the eastern portion of the stage 1 <br /> area, a permanent earthen noise barrier within 200 feet west of the proces- <br /> sing plant is not possible. Once the 21-acre operations area is mined and <br /> established, the surface of the operations area should be 10-15 feet below <br /> the surrounding area. This will provide a visual , noise and wind protection <br /> buffer. In addition, overburden from the 21 acres will be stockpiled <br /> around the perimeter of the site, increasing the height of the barrier. <br /> Staff recommends that the majority of the overburden be stockpiled on the <br /> northwest, west and southwest boundaries of the operations area so as to <br /> provide the most visual , noise and windblown dust protection to the <br /> residences in the area. Overburden stockpiles should also be revegetated <br /> with native grasses as soon as possible. Since the stage 1 operations <br /> area will not be reclaimed, the overburden stockpiles should remain until <br /> that time. <br /> The applicant proposes maximum stockpile storage of 250,000 tons. This <br /> is equivalent to about one year' s production. In light of the purpose of <br /> the stockpiles as noise barriers and mitigation proposals by the applicants <br /> and conditions by staff, this is felt to be a reasonable maximum level . The <br /> applicant has indicated that any sand stockpiles , which are more susceptible <br /> to wind erosion, will be located so that they are protected by other <br /> stockpiles of heavier washed materials and protective berms. <br /> According to the State Air Pollution Control Division, chemical sur- <br /> factants are available which, when sprayed upon stockpiles, form a crust <br /> which discourages wind erosion even under high wind conditions. These <br /> surfactants should be used on stockpiles, especially those located on <br /> the perimeter of the operations area. They can remain at least partially <br /> effective on the exposed sides of stockpiles even when the other side <br /> of the stockpile may have been disturbed by loading activities. They <br /> will not be effective and thus need not be used during production periods <br /> when stockpiles are being replenished, but should be used during periods <br /> of inactivity of three days or more for each stockpile. <br /> Other Dust Control Items <br /> 1 Turnpike Pit - The existing Turnpike Pit, which is governed and bonded <br /> by state MLRB permit #78-64, should be completely reclaimed and <br /> groundcover established prior to disturbance of any areas on the <br /> Deepe property. <br /> 2) Wind Conditions - Operations on site should be halted when winds on <br /> the site e exceed 30 mph. <br /> 3) Staging - Revegetation of one stage should be completed before new <br /> areas are disturbed on the next stage. Ideally, the reclaimed stage <br /> would be seeded in the fall planting season and initial disturbance <br /> of the next stage would be accomplished in the winter months when <br /> unprotected noise levels will have less impact. Strict application <br /> of the 25-acre maximum disturbed area will have the same effect. <br />