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7 <br /> Maximum Peak Particle Velocity <br /> steady state 1.0 inches/second <br /> impact 2.0 inches/second <br /> Mote.- the maximum particle velocity shall be the <br /> maximum displacement vector sums Of three mutually per- <br /> pendicular components recorded simultaneously, mul pofed <br /> by the frequency in cycles per second. For pub <br /> this ordinance, steady-state vibrations are vibrations which <br /> are continuous, or vibrations inudiscrete impulssesuses <br /> frequent than sixty (60) p r minute, shall be considered <br /> which do not exceed sixty (6) per <br /> impact vibrations. Maximum air blast vibtatiothe extra measured <br /> at the lot lines of the zoning lot containing <br /> tive use, shall be 125 decibels on the linear scale. <br /> b) The Rehabilitation Plan shall be referred to the Orange <br /> County soil and Water conservation District for review <br /> and recommendation, which shall not be binding upon the <br /> Board of Commissioners, in particular reg arding the <br /> landscape material specified, the planting and maintenance <br /> proposed to insure continuous growth and development, and <br /> e proposals for the handling of lakes, <br /> the acceptability of th <br /> ponds, etc. <br /> C) The permanent roads defined as those to be used in excess <br /> of one year, within the excavation site shall be surfaced <br /> with a duct free material such as soil cement, bituminous <br /> concrete or Portland Cement concrete en <br /> from the located <br /> road <br /> to the yard area. Also, all permanent <br /> land shall treated <br /> within 300 feet of residentially be <br /> the same. <br /> d) Roads other than permanent roads shall be treated withi dust <br /> inhibitors, to be specified the1generationIofodustlfrom the <br /> will reduce to a minim= <br /> road surfaces <br /> operated water wagons fshall be an acceptable ptable� m method . <br /> Poly °p <br /> of dust inhibition- <br /> e) Where the proposed extraction shall take place within 300 <br /> feat of a dwelling, school, church, hospital, commercial. <br /> or industrial building, public building, or public land, <br /> a security fence at least six feet high shall be installed. <br /> f) Spoil piles and other accumulations of by-products shall <br /> not be created to a height more than forty feet above the <br /> original contour and shall be so graded that the vertical <br /> slope shall not exceed the material's natural angle of <br /> repose. <br /> g) The Operations Phan and the Rehabilitation Plan shall be <br /> coordinated so that the amount of disturbed land is kept <br /> Sato <br /> the absolute minimum consonant with g <br /> that rehabilitation proceeds in concert with extraction. <br /> 8»9 <br />