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A ~ ~ 1111111111111111111 <br />• SCHNABtL 999 <br />E N G I N E E R I N G <br />A S S O C I A T E S <br />274 UNION BOULEVARD. SUITE 220 LAKEWOOD. COLORADO 60228 • 303-9800056 <br />ILME$ J SCHNPBEL P E GOgpON M MAiHE 50N PX D. P E <br />q<YE MGgTIN PNO PE STf PHfN$ XLgT,PE <br />OEq PIOC pOVIT.PE <br />Eq NEST wINTEP PE <br />January 20, 1989 <br />Our Ref. C0881571 <br />Rocky Mountain Asphalt <br />19t0 Rand Avenue <br />Colorado Springs, Colorado 80906 <br />Attn: Mr. Steve Schnurr <br />SubJect: Potential For 81ast-Induced Vibrations <br />At Cave of the Winds From Mining at <br />Proposed Summit Pit <br />Gentlemen, <br />In accordance with the request of Mr. Michael Stanton, we have performed <br />a preliminary evaluation of the potential for blast-induced vibrations at the Cave <br />of the Winds due to mining at the proposed Summit Pit. <br />The scope of this evaluation was to examine the geologic and anticipated <br />mining conditions and provide an assessment of any adverse effects that could <br />occur at the Cave of the Winds due to mining of the Summit Plt. In addition, an <br />evaluation of the impacts of blasting at the Snyder Ouarry, northeast of the Cave <br />of the Winds, was completed. Thoaa evaluatlona were based on dn<a available In <br />the literature on tkr affects of blasting on underground apeninga and do net <br />Include any sits-speetflc blasting dataf As a result, the conclusions presented <br />may be subject to modification based on site-specific data obtained In the future. <br />Blasting is anticipated in the Summit Pit and Is currently used at the Snyder <br />Quarry to loosen relatively solid rock for excavation and processing. Blasting <br />typically Involves drilling a series of near-vertical boreholes In a regular pattern, <br />loading the boreholes with an explosive, and detonating the explosives in a <br />sequence that breaks and loosens the rock. The blast holes are normally not <br />detonated simultaneously, but in a specific "delay" sequence that efficiently <br />CONSULTING GEOTECHNICAL ENGINEERS AND GEOLOGISTS <br />BEir.ESU~ MD • d4~TIMORE MO RICHMOND Y~ ~+MRTOrt, ~., ~yESi CHESTER PA VIENNA. YA IPKE ~ II~AII~~s <br />G 2 <br />c,~y ss ~nz <br />