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- `/~ atheson <br />fining <br />• C onsultants <br />11460 W. 44th Ave., Suite & <br />Wheat Ridge, Co 80033 <br />30356-5636 <br />Fax 303456-5639 <br />SENECA COAL COMPANY <br />GROUND VIBRATION ATTENUATION STUDIES <br />2-W AREA <br />January 22, 1998 <br />Executive Summary <br /> <br />Matheson Mining Consultants (MMC) monitored ten single ho-e test blasts with five <br />seismographs at the Seneca Coal Company, ?-W mining area. All ground vibration data <br />and analyses are attached to this report. <br />The recommended scaled distance to not exceed the regulatory limit at the Meridian Oil <br />Well, Dry Creek Unit 3-22, located NE SW Section 22 TSN, Routt County, Colorado of <br />5.0 inches per second peak particle velocity is 10.49. The analysis is comprised of fifty <br />data points and has a correlation coefficient of 0.914. <br />Scaled distance is a relationship used in explosives engineering to interrelate blasts with <br />different maximum charge weights per delay. <br />D <br />SD = <br />Where: SD is Scaled Distance <br />D is distance in feet <br />W is maximum charge weight per 8 millisecond delay period. <br />Below is a table based on the regulatory limit of 5.0 inches per second. Maximum <br />charge weight per delay listed in the table at the given distance will result in a 95 <br />confidence of 5.0 inches per second or less. <br />Table 1: Distance versus Charge Weight for Scaled Distance = 10.49 <br />Distance (ft) Charge Weight (Ibs.) <br />100 90.9 <br />200 363.8 <br />300 818.5 <br />400 1455.1 <br />500 2273.5 <br /> <br />