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to remain in compliance. This timing sheet is then sent to the field with the blaster as the design tie-in sheet. Although, this procedure is not perfect, it eliminates significant potential for error in long hand calculations. On more complicated blast patterns where the Excel spreadsheet will not provide accurate calculations, Colowyo utilizes blasting software to ensure compliance. Colowyo has been using this method for the last nine months. Failure to record the actual maximum weight of explosives detonated within 8-millisecond time period. Colowyo has historically calculated the maximum weight of explosives detonated within any 8-millisecond time period by the following means: (Max. no. of holes in any 8-misec) x (Max. lbs. of explosives put in any one hole) The maximum charge weight has been calculated this way to ensure that any blast designed under this criterion would not exceed the allowable amount using the scale distance formula. Thereby, meeting the intent of the law to not exceed the maximum weight of explosives in any 8- millisecond time period. Colowyo's blast records reflect the maximum weight of explosives using the above method. In our survey of other Colorado and Wyoming surface coal mines, the same method is utilized to determine the maximum amount of explosives detonated in any 8-millisecond time period. In conversation with CDMG (Dan Hernandez) on November 19, 2003, it is our understanding that CDMG is requesting that this calculation of "maximum weight of explosives" be an actual number representing what occurred during the shot. To accomplish this with traditional (long hand) means would be a monumental task due to the numerous possibilities of overlapping 8-millisecond time periods. To accomplish this with today's technology in spreadsheet models would even be onerous and very time consuming. Colowyo is on the leading edge of blasting technology to not only include the latest field components in modern day blasting, but we have trained our personnel in blasting techniques and utilize sophisticated software to assist in blast design. Through conversations with Mr. Hernandez there may exist a software that can calculate the "maximum amount of explosives the was detonated in any 8-millisecond time period." As shared with Mr. Hernandez, Colowyo has been progressive in implementing improvements of our blasting program to GPS instrumentation on drills to ensure blast hole pattern and depth designs are followed, targeting maximum effect in Colowyo's blast events. The technology in the ability to retrieve data from the field that represents actual numbers is still in the long hand form. Although Colowyo is looking at different means to electronically retrieve Notice of Violation ~V-20;3-C13 2 C.ommenC & i3e,~ccz~ses N `,CCC NScGECENTftAL FfLE SYSTEht±~#.C~ C~tv;G?>=.2 Fermii~,~2.7 G[':MG & OSi~ inspection Reports NOVsi4 2.1.2 NOV's~NGlj_CV_2063__a13\Gcarnment ~ Response i -dcc