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• <br />TABLE II <br />Allowable Blast-induced Stress 30,000 psi <br />Corresponding Particle Velocity <br />(~.orat case) 18.0 ips <br />SAFETY FACICR <br />Since the pipeline could have been pre-stressed during the installn- <br />tion process and may have deteriorated slightly during the past 26 years, <br />one-calf of the Warst case particle velocity cited above should be used. Thin <br />corresponds to a safety factor of 2. <br />Alla~able Particle Velocity <br />• woacat Case 9.0 ipa <br />RESULTS <br />Based on the results of the SRI study and report, a safe ground <br />vibration limit far the pipeline at the Rimrock Mine has been determined to be <br />9.0 inches per second (Worst case). <br />1. Although the SRI research program consisted of nuoerous field testa with a <br />wide range of scaled distenoea and pipeline diameters, the tests were limited <br />in shot size and in rock soil media. With these limitations in mind, the <br />determined limits of particle velocity should be applied prudently, a~ the <br />stress/particle velocity relationship verified far specific sites aid shot <br />and pipeline designs. <br /> <br />-5- <br />