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recorded loading of one hole of the 2/16/03 blast was one pound over the reconstructed loading. <br />The recorded loadings of 4 holes of the 3/19/03 blast matched the reconstructed loadings; one <br />hole was 74 pounds short of the reconstructed loading. <br />s Rule 4.08.5(11) The total weight of explosives used per 8-millisecond period that was recorded <br />was in error, either from not recognizing all of the holes that were detonated, or from selecting <br />those holes that did not comprise the maximum total of explosives. <br />a Colowyo is required to periodically monitor to ensure compliance with airblast standards [Rule <br />4.08.4(6)(c)]. The seismograph in use had not been calibrated within one year of the date of the <br />blasts reviewed (there was no record for the February 3 blast, due, perhaps, to signals below the <br />trigger level). The seismograph had been calibrated on December 13, 2001. It was again <br />calibrated on April 29, 2003. Thus any periodic monitoring for afour-month period, from <br />December 14, 2002 to April 29, 2003, was out of compliance with the calibration requirements <br />of Rule 4.08.5(17)(a). None of the seismographic and airblast records reviewed above included <br />the distance of the seismograph from the blast [Rule 4.08.5(17)(b)]; however, the distance from <br />the dwelling where the seismograph was located to the closest shot hole in the blast was recorded <br />on the corresponding blast record. None of the seismographic records included the name of the <br />person taking the reading [Rule 4.085(17)(c)] or the name of the person analyzing the <br />seismographic record [Rule 4.085(17)(d)]. However, the records did identify Colowyo Coal as <br />the "Client", and Colowyo Coal Co. as the "User Name". A seismographic record of August 30, <br />2003 carried the signature of Mathew L,engerich (Colowyo Blast Engineer) and indicated that the <br />seismograph had been calibrated on Apri129, 2003. <br />