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° oii-oiooiooiooooooio~ <br />DEPARTMENT OF NAl ~ r,r+~ , .~ 98 ... ... _.. <br />Davi^ H. Getches. Executive Director 8 <br />~V~1C~D ~Qf~Do G°~C~C~~vVUIiG°Q~~OO~1 DON/~~0~~1 <br />DAVID C. SHELTOPo, Director <br />v <br />Rmhartl D. Lamm <br />Governor <br />May 8, 1985 <br />Mr. Steve O'Brain <br />Environment, Inc. <br />9989 W. 60th Avenue <br />Arvada, Colorado 80004 <br />Re: Albert R. Frei - Walstrum Mine, Permit No. 83-33 <br />Dear Mr. O'Brian: <br />As we have previously discussed, the Division is <br />blasting problems that have occurred at the Wals <br />understanding that due to the problems that have <br />has contracted out all future blasting. Even if <br />Division has the following concerns that must be <br />possible. <br />What is the anticipated blasting schedule? <br />.m <br />very concerned about the <br />:rum Mine. It is our <br />been encountered, Mr. Frei <br />this is not the case, the <br />addressed as expeditiously as <br />Please describe in detail your blasting techniques. <br />what type of explosive material will be used? <br />Please submit a map depicting all structures within one half mile of the <br />quarry. <br />~5~ What is the maximum observed fly rock distance? <br />6. What scaled distance equation or table is used to determine the maximum <br />w fight of the explosives used? Please provide this documentation. <br />Have there been any ground vibration measurements and analyses? If not, <br />it ill be necessary to do so now and submit this documentation to the <br />Division. <br />Please submit this information as soon prior to the May, 1985 Board meeting as <br />possible. <br />Sdn rely <br />1 <br />Peter ~. O'Connor <br />Reclamation Specialist <br />PVOC/ygt <br />0246E <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />