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NOV-12-_1997_ 12 36 FROM ROCKY MTN. MRTER'IRL TO 13038328106969 P.02 <br />~ ~ . III IIIIIIIIIIIIIIII <br />999 <br />!~ ratf>ie~On +~ ~ w assn nr<. see s <br />h>ti wre.y~ ~ eooa3 <br />~aSB-seas <br />OA/Y F®c 20tj468~5638 <br />October 24, 1997 <br />Mr. Rick Batista <br />Blackwing, Inc. <br />P. O. Sox b457 <br />Vroodland Park, <br />Fingstsff, A'L 8b001 <br />Re: Blast monitoring at Red Mountain Quarry, 10/17/97 <br />Dear Mr. $atista; ~ ' g~_ ~~~ <br />Matheson Mining Consa]tants (MMC) monitored one quarry production <br />blast on October 17, 1997 at Rocky Mountain I+taterials Red Mesa Quarry <br />is Fremont County, Colorado. Two Iastontel Blastmate II[ digital blasting <br />seismographs were used to monitor the blast. One seismograph, 1iA5552, <br />was placed at the ranch house, 3131 Barrett Road. 7'he second <br />seismograph, BA5738, was placed at the acxt closest hounc, ? I03 Barrett <br />Road. Neither seismograph recorded the event with trigger with levels.at <br />0.05 inches per second (ips) and 0.04 ips respectively, the air channel <br />trigger was set at I29 dBL on both instruments. Attached to this letter are <br />the monitor logs from each. seismograph showing they were monitoring at <br />the shot time and a copy of the blast rep~tt showing the number of holes, <br />tote! charge weight and maximum charge weight per delay. ~,~t- <br />The ground eu~tion at the iao boasts wss less than the seismograph ~ .~.,,a~"p, q~1P5 <br />trigger levels, 0.05 ips at the ranch house and 0.04 ips at the second' l o~~ <br />house. The air overpressure at both loeations was less than 129dBI-- At <br />both locations the seismograph was placed within ten test of the house <br />between the house and the blast location. Q~ <br /> <br />Sincerely, <br />~:~ fi <br />Colin M" Matheson <br />Mining Engineer <br />POQ-B' brand lgx harrsmNtal mono 7®1 •ap;a . <br />r~ PIMn ~w 1_, <br />K a ~° F'1e"~ <br />o~+. <br /> <br />