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Rece SVea: ]/i0/ O 2: 09PM; 30G]BB9G5a ~ PREEO 9IlVERmO.N GREEN; Pege ] JUL-10-2009 O2:IOPIA FROM-PLANN~,yG DIV1510N-ARAPAHCE COUNTY 3037AA605: T-5A8 P.007/015 F-617 Staff believes the movement of dump trucks and excavation is not an unusual activity in an agricultural region and the noise impacts considered typical of these operations. Through the public hearing process, the differences between agricultural operations and this mining proposal were identified as the daily intensity of this mine over a 20 year period. The mitigabon measures identified in this staff` report are to determine if the impacts can be mitigated. The nearest residential homes are a significant distance from the site, which will help mitigate noise. Additional mitigation measures have been generated and detailed below. Fugitive Dust Several of these issues have been further addressed al the meeting on June 26'" and have been incorporated in to the revised proposal. Tri-County Health, West Arapahoe County Soit Conservation District and the State Conservation Board al! agreed that additional mitigation for fugitive dust control was required. The following recommendations were made: A buffer of suitable trees be planted along the perimeter of the property • Additional native grasses be planted in strategic locations • Restrict the mining operation when winds exceed 30 m.p.h. • An anemometer (monitoring device) be placed on the scale house to monitor the winds force and speed and enforoe the 30 m.p.h. Limit. • Use of chemical additive to the access road on and to the site which may include: lignon sulfonate, magnesium chloride or calcium chloride. • Speed limit sign be posted along the access roads • Planting of millet on the storage piles for stabilization The applicant has agreed to these recommendations and staff is recommending they be incorporated into the proposal and completed within the continuation period. Noise Tri-County Health Department is in the process of reviewing methods for measuring and monitoring noise levels for this operation. Staff recommends That these issues be resolved prior to any approval of this application. The following items are required for noise mitigation during the continuation period: • Revise the pattern of excavation so that alt activity moved from east to west and not a zig zag pattern moving east and west. This will move the activity away from the property owners on the western boundary as quickly as possible. • The applicant is researching the use of movement sensitive back up beepers to further minimize noise. • A maximum noise level be established at the property boundary and a monitoring plan be established. 6