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CONCLUSION <br /> <br />Interpretation of the monitoring results, analysis of the acquired <br />data, data plotting, and to a limited extent, a linear regression <br />program all support the following recommendation(s). <br />The 25 pounds per delay can be increased without jeopardizing the <br />structural integrity of items in place on the Uorchester property. <br />Colorado State regulations now state that 1 inch per second particle <br />velocity is the maximum vibration magnitude allowable to avoid damage. <br />The January 28, 1981 blast produced a maximum vibration of 0.16 in/sec <br />i and this at two Dorchester locations: <br />1. Sediment Pond Corner <br />2. Propane Tank <br />For many years prior to 1981, 2 in/sec maximum particle velocity was <br />the acceptable limit before any damage was possible. <br />It is obvious then that a greater charge weight per blast can be <br />tolerated without incurring unacceptable damage to specific objects. <br />~ To establish the increased weights of ANFO allowable, it will be <br />essential to monitor each future blast to determine the magnitude <br />.of the generated vibrations. Sucli an empiric:~l approach in increasing <br />increments is mandatory to achieve the desired results. In order that <br />higher velocity data be acquired, it is desirable that a higher scaled <br />distance be employed. Based on a study of the present data, we would <br />make the interim recommendation that a scaled distance of no less [Ilan <br />40 be used. This will permit the collection of more meaningful data <br />