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ACA <br />• • ~ <br />`° P+g~6o~Vt, ~®aoar~ts, A~grrat~t~s °° <br />P.O. Box 1887, 702 4regg Drive, Buena Vista, CO 81211 <br />Ph. 1719) 395-3790 <br />Fax 17191 395-3794 <br />TROUT CREEK QUARRY <br />BLAST REPORT <br />SHOT # 1 FEB. 22, 2002 <br />The firs[ shot (or blast) for the Trout txcek Riprap quarry was detonated on February 22, 2002, at <br />approximately 2:35 PM. The shot plan is attached for reference. The drilling was completed in the <br />morning, on the 22vd and the loading of explosives followed immediately following. Licensed Blasters, <br />Mike Coleman and Ron Koch did the loading, under the direction of Dave Dannenberger of Buckley <br />Powder Company. Mike Pelino and David ITapl assisted Nick Pelino, General Superintendent, was the <br />onsite supervisor. Nick took his Blasters License the following Monday, and passed. <br />This first shot was primarily a pioneering shot to establish a bench, None of the holes required the <br />maximum amount of explosives, which has been set at 421bs per delay. Each hole was delayed a minimum <br />of 9 milliseconds (ms) as can be seen from the blast plan. The shot was at the southern end of the permitted <br />quarry azea and a maximum distance from the RCC Date. The distance scaled on a USGS Topographic <br />map was approximately 1000 feet. The limits of 421b. per delay and maximum Peak Particle Velocity <br />(PPV) of 2.0 ips was based on a shot occurring within 200 feet of the RCC Dam. <br />An Instantel DS-477 Blastmate Seismograph was set up for the blast. The geophone was placed on solid <br />rock on the left side of the base of the RCC Dam, just downstream of the Mass Concrete which forms the <br />left side of the Stilling Basin. For reference, the left side is the East Side and the same side of the small <br />canyon as the quarry. A sandbag was placed over the geophone as required. The trigger level was set at <br />0.2 in/sec in order to record the Peak Particle Velocity (PPV). The PPV is not to exceed 2.0 in/sec by <br />permit from the Division of Minerals and Geology and industry standards. After the shot was detonated <br />and cleared by the Blasters, I returned to observe that the seismograph failed to trigger at the 0.2 in/sec <br />level, indicating that the shot did not produce any PP V greater than this value. For the next shot the trigger <br />level will be lowered. Instantel, inc. calibrated the seismograph on September 20, 2001. A copy of the <br />Calibration Certificate is attached for reference. The unit was tested in my office by deliberately jarring the <br />geophone and the unit triggered the day before the shot. It was again tested in the same manner the <br />following Monday, Febniary 25, 2002 and the seismogaph triggered. This indicates that the seismograph <br />was not malfunctioning. <br />Overall, Shot number one was a success. It did produce some riptap, but the quality has yet to be <br />determined. Currently, the crew is clearing the shot rock and sorting. A rough bench has been produced, <br />and drilling for the second shot will take place within the next week. <br />~~S~ubmi~tted and filed on February 28, 2002. <br />Project Manager <br />