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i <br />22. Prior to commencing blasting operations on the east side of the current location of SR 1104 <br />and in all events no later than three years from the date the issuance of this permit, <br />American Stone Company shall begin to enclose equipment used in the secondary portion <br />of the plant operations including the crushing and screening towers following the guidelines <br />and in general conformance with the National Stone Association's Community Noise <br />Manual grid shall complete the enclosures within four years from the date the permits are <br />issued. <br />23. Within seven years of issuance of this permit, American Stone Company shall relocated <br />the primary crusher and related equipment to the pit. <br />24. American Stone Company shall request that the following conditions also be made <br />conditions of its amended mining permit: <br />(a) American Stone Company shall use the most current, generally accepted blasting <br />techniques available and will inform the County Manager, or designee, before changing <br />blasting .techniques. <br />(b) American Stone Company shall adhere to the following limits to be measured by <br />seismograph at the nearest property line of property under control of American Stone <br />Company during the mining process; <br />(i) .Air blast limit of 125 decibels. <br />(ii) Maximum peak particle velocity of 0.6 inches per second, provided that <br />American Stone Company will strive for a maximum peak particle velocity limit of <br />0.5 inches per second. <br />(c) American Stone Company shall limit its continuous noise operations (plant <br />processing including the jaw crusher) at the boundary of the property encumbered by the <br />original special use permit and at the boundary of the property added to this modified <br />.. speciai-use permit to b0 decibeis. _ - _ ._....... _ ...-.,..._ .._ <br />25: American Stone Company shall limit blasting charges to a maximum of 450 pounds per <br />delay, and at least 80% of its blasts will be less than 300 pounds per delay. <br />26. American Stone Company shall take all reasonable precautions to prevent fly rock from <br />leaving its property. . <br />27. When blasting east of the current location of SR 1104, American Stone Company shall <br />monitor each blast with two seismographs. One seismograph shall be located at the <br />nearest off site occupied structure as required by American Stone Company's North <br />Carolina Mining Permit. The second seismograph shall be located at the nearest property <br />line. <br />28. American Stone Company shall encourage all truck operators leaving the premises to be <br />mindful of lawful weight and safety of load practices, including the use of covers when <br />required by law. <br />