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• III IIIIIIIIIIIIIIII * ~-`___~.~~_~~;-~;=_ <br />CF&I ST~EL CORPORATION <br />A e be~Alary of Crane Co. <br />P. O. Box 31 Pueblo, Colo. 81002 <br />JAMES G. <br />entl querrlee <br />October 13, 1981 <br />Mr. Peter Evans <br />Reclamation Specialist <br />State of Colorado <br />D1ined Land Reclamation <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Re Canon Quarry Blast <br />Vibration Results <br />Dear Mr. Evans: <br />-~~- 310 <br />Attached are the results of a blast vibration study that was <br />performed in 1978 for CFF,I's Quarry near Canon City. The results <br />showed the typical blast to be well within the limits designed to <br />protect structures from blast vibration damage. <br />VME-Nitro Consult, Inc., acting as the blast vibration consultant <br />to CF$I, monitored the 3:45 p.m. blast on Tuesday, January 1978. <br />The program consisted of recording and measuring the vibrations <br />occurring at five Canon City locations. Vibrations at all five <br />locations were detected and recorded. The results are tabulated <br />and included as a separate page in the results. The maximum <br />particle velocity occurring off CFf,I property was at the Murphy <br />residence registering 0.03 inches/second. The maximum particle <br />velocity measured at any location was at the CF$I Quarry office <br />and was 0.18 inches/second. Both of these readings are well below <br />the current regulations that specify 1.0 inches/second as the <br />limit. <br />JG1V/rcm <br />Enclosures <br />Yours ery truly, <br />% I ) <br />i <br />1 C~/C/// <br />~'Cl 1 ~ 1981 <br />f'vil!~'~U L9.!1!D R~CLAtYiRilO~l <br />