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t3cnson k3mthcrs Quarrv on Neari~y Kock Itluffs <br />fhc southern limits of thr proposed mining area are hxatcd near a ridgcline bordering several <br />residential properties located Farther south. Residents living below the ridge and others acting on <br />their behalf have a\prcssrd concern that ground vibrations from mining cyuipmcnt such as <br />crushers, dozers and back-hoc excavators could cause rock falls in the Rollins Sandsumc ('lifts <br />located about ±1111 feet south of thr proposed mining arra boundary. A picture, kx~king north. <br />showing the ridge and sutdstone hlun• is shown in Figure 2. "I~he Vineyard shown in the <br />ti~reground is owned by Janet (Yoissant ('0093 Snuevdnti Road, ('cd:u• Ridge, ('Ol. <br />In response to these ronccros and in contiirntance with the standing gcotcchniral sutbihty <br />evaluations rcyuirrd by DMG mining pcrntit rules. Benson Brothers has retained Gordon F. <br />Re\ey of RIiVL•1' .4suxiates. Inc. (RAI I to evaluate potential ground vibrations and their impart <br />on the stability oFthc ridge and sanetstone hluth. <br />In order to dcterminr expected maximum levels of cyuipmcnt vibrations and there impacts on <br />ruck slope stability at various distances, R:\I retained PreScis'l~ek. Inc. to mc;rsurc ground <br />vibrations caused by eywpntent at the currently operurng Henson Brothers Quan} in Austin, <br />CO. 'I'bis cyuipmcnt, similar to cyuipmcnt that will Ix used at the proposed Rcd Shale Quarry <br />Kf \'ta' Acux~atis, lnc Page ? of 7 FcAnwn 2006 <br />Figure 2: Ridge and Sandstone Bluffs Lexuted south of Proposed Rcd Shale Quarry <br />