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~ • • United Companies, Inc. WCT x'201494 April 7, 1994 Page 2 The mining operation will not be excavated to the water table; thus, no dewatering wells will be used. Since the mining operation will not encounter the water table and dewatering wells will not be used, there should be no effect on the water table in the residential well. Another potential effect of a mining operation such as this is vibrations. Trucks will be hauling on the haul road at 108 feet or greater from the residence. Vibration from trucks has a short duration and low frequency thus, these vibrations will carry only a short distance in soils located at the site. This can be supported by major highways being at much closer distances than the 108 feet with no effects to the structures. An asphalt plant is proposed for the gravel pit and is planned to be located at 1100 or more feet from the residence. This distance is nearly a quarter mile. With the low amount of vibration developed by the asphalt plant, it is obvious no damage could occur to the residence or it's components. Vibrations from the asphalt .~ plant cannot be detected without instrumentation beyond a distance of 100 feet, in general. The operation with the greatest vibration potential is the crusher plant. Land Reclamation requires a 200 foot set back from any manmade structures for crusher plants. This distance is required to prevent any significant damage and includes some safety factor. The closest structure to most crusher plants is the temporary office or scale houses. These structures would generally be of much lower quality construction than the residence and have shown no damage while being place near crusher plants. The 400 feet or greater distance proposed for the crusher plant is twice the distance that is considered safe against any damages to manmade ~ structures.