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81 : ; .. <br /> 3: wLci <br /> - er <br /> the sum of 3 mutually perpendicular displacement <br /> components recorded simultaneously.. For purposes <br /> of this ordinance, steady state vibrations are <br /> vibrations which are continuous, or vibrations in <br /> discrete impulses more frequent than 60 per minute. <br /> Discrete impulses which do not exceed 60 per•minute, <br /> shall be considered impact .vibrations.. Maximum air <br /> blast vibration, measured. at the lot lines of the 2. <br /> - zoning lot containing the extractive use, shall b - - <br /> 125 decibels on the linear scale. <br /> ,The Applicants have stated that the operation..can'meet..the <br /> -required vibration levels.' 'They have supplied a°,letter <br /> from Philip R. Berger and Associates dated July 11, 1980 <br /> that supports American Stone's ability to meet the above <br /> standards. <br /> b) The Rehabilitation Plan shall be referred to the <br /> Orange County Soil and Water Conservation District . . <br /> for review and recommendation which shall not be <br /> binding upon the Board of Commissioners, in partic- <br /> ular regarding the landscape material, specified, the <br /> planting and maintenance proposed to insure contin-. <br /> uous growth and development, and the acceptability <br /> of the proposals for the-. handling• of lakes, peads, etc. <br /> American Stone has supplied the standards to which they will <br /> reseed and stabilize the dist3=5e&. areas and overburden: <br /> spoil pile storage areas. These standards have been approved <br /> by the Soil Conservation Service. <br /> The Orange County Soil Erosion Control officer has visited <br /> the site on several occasions and finds no problem with the <br /> settling ponds used by American Stone. -- <br /> c) The permanent roads, defined as those to be used in <br /> excess of one year within the excavation sites shall <br /> be surfaced with a dust free material such as .soil <br /> cement, bituminous concrete or Portland Cement concrete <br /> from the nearest public road to the yard area. Also, <br />