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Filed for Record 04/16/2009 04 :48 :53 PM -Kittitas County, WA Auditor -200904160090 Page 83 of 118 <br />order and that engine enclosures be used on equipment when the engine is the dominant source of <br />noise. <br />B-48 Stationary equipment shall be placed as far away from sensitive receiving locations as <br />possible whenever construction occurs within I 00 feet of a site boundary . Where this is infeasible, <br />portable noise barriers shall be placed around the equipment with the opening directed away from <br />any sensitive receiving property. <br />B-49 Use hydraulic or electric models for impact tools, such as jackhammers, rock drills and <br />pavement breakers, to reduce construction and demolition noise. Require operators to lift rather <br />than drag materials wherever feasible. <br />B-50 Construction in MPR subphases directly adjacent to the Roslyn Memorial Gardens Cemetery <br />shall be scheduled so as to abstain from construction tasks during burials and any scheduled <br />memorial events. <br />Mine Hazards. The EIS discusses adverse impacts related to mine hazards and identifies <br />mitigation measures that should be implemented. Pursuant to Kittitas County SEPA Ordinance <br />Section I 5.04.200(d), Comprehensive Plan Policies GPO 2.186-2.187 and GPO 2.81-2.83, and <br />KCC 17 A.06.030, the following mitigation measures will be required. <br />B-51 Mine entries, adits, shafts and existing sinkholes shall be pennanently sealed using a <br />controlled backfill and/or grouting, or an approved engineered seal. <br />B-52 Shallow prospect pits shall be backfilled to the surface using controlled backfill. Surface <br />drainage shall be diverted away from existing sinkholes and prospects. <br />B-53 Prior to any development in areas identified as high coal mine hazards, sites shall be <br />evaluated by direct subsurface exploration to demonstrate that mine workings either do not exist, <br />or that the workings have fully collapsed so that there is no remaining potential for sinkhole <br />development. Alternatively, a geotechnical report, prepared by a licensed geologist/engineer, <br />may demonstrate that the hazards associated with any voids can be fully mitigated by backfilling, <br />grouting, or other approved means such that the potential for sinkhole development is eliminated. <br />B-54 No development shall be permitted over workings where surface or subsurface studies <br />indicate the presence of combustion in the underlying seam or seams. <br />B-55 Prior to development in low coal mine hazard areas, additional geotechnical study shall be <br />conducted to evaluate the effects of regional ground subsidence, including vertical subsidence, <br />ground tilt, and ground strain. Buildings, roadways, storm drainage systems, and underground <br />utilities could be designed and constructed to accommodate the maximum tilts and strains <br />expected. <br />8-56 Existing piles of mine waste rock shall remam undisturbed. No structures shall be <br />constructed on areas of mine rock fill. <br />Suncadia MPR Conditions of Approval <br />December 2, 2008 <br />Page 15