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.' <br />-4- <br />CONCLUSIONS: Addressing the requirements of the Lorimer County Special <br />Reviews Findings and Resolutions; Resolutions Para, l.b. Items 1 ro 5, <br />Vibra-Tech Engineers submit their conclusions as follows, under these <br />items numbers: <br />1. The potential for damage from blasting a maximum of <br />50 pounds per delay, at distances of 600 feet, to area <br />structures, houses and wells, is nil. <br />2. The expected noise (air overpressure) and vibration <br />(ground motion) impacts on area residents are minimal. <br />IE the recommendations are followed, few of the area <br />residents will be aware of the blasting. Some may <br />perceive low levels of ground motion (up to 0.10 inches <br />per second). Under some atmospheric conditions and <br />wind direction even if the recommendations are followed, <br />some of the shots may be heard. <br />3. Recommendations are made in the following section. <br />4. OSM regulatory blast vibration limitations are recom- <br />mended, as stated in the 'Recommendations'. <br />5. Blast vibration monitoring and control has been discussed <br />in this report, and is again mentioned in the 'Recommen- <br />datioins'. To be quite specific, while Vibra-Tech <br />Engineers would be pleased to carry out a blast vibration <br />monitoring program, we cannot in honesty feel that this <br />would be essential as a permanent continuing program, <br />becau.;e of the very small size of the shots. In order to <br />satisfy the unconvinced, and to confirm the substance of <br />this report, a monitoring program could be instituted for <br />an initial period. Should permanent monitoring be required, <br />it could be carried out, but Vibra-Tech Engineers do not <br />expect to collect any significant information. <br />Vibration control, as discussed, is also possible, but again, <br />because of the very small explosive weights, is not considered <br />to be necessary. <br />RECOMMENDATIONS: <br />1. If possible, exposed surface detonating cord should be eliminated <br />in order to reduce as far as possible the audible effect of the <br />blasting. <br />2. Ttre 0:>M regulations as they address blasting vibrations, ground <br />motion and airblast, should be adopted. <br />