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Attached is a paper presented at the Society of Explosives <br />Engineers 1993 Annual Meeting. David Siskind of the United States <br />Bureau of Mines recommends a peak particle velocity of 5.0 inches <br />per second to prevent damage to pipelines. Vibra-Tech has used the <br />5.0 inch per second limitation on ground vibration near engineered <br />structures including oil wells and pipelines for many years and has <br />not seen a single incident of vibration induced damage to a <br />structure. <br />Sincerely, <br />~(. ~~ <br />Colin M. Matheson <br />Area Manager <br />Vibra-Tech Engineers, Inc. <br />• <br /> <br />4 <br />