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trained, and competent personnel and each person responsible for blasting operations will possess a <br />valid certification in accordance with state and federal laws. <br />Preblasting Survey -There are no dwellings, structures, or residents within one-half mile of the D Portal <br />Area. No preblasting survey is required of company-owned buildings. <br />Surface Blasting Methods -Any surface blasting will be conducted between sunrise and sunset except <br />in special situations approved by the DMG. <br />Residents or owners of buildings, structures or utilities will be notified no less than 24 hours prior to any <br />blasting conducted within 1/2 miles. <br />Control of Flvrock - Flyrock will be controlled by proper hole spacing, loading, and detonation timing <br />such that flyrock will not travel further than 1/2 the distance from the blasting vicinity to any occupied <br />building or structure, and in no case beyond the area of regulated access. tf necessary blasting mats <br />will be used to control flyrock. <br />The maximum peak particle velocity in the blasting operations will be limited to less than or equal to 1 <br />inch per-second at the location of any dwelling. The peak particle velocity limitation will be achieved by <br />limiting the arnount of explosives to be detonated within any 8 milisecond period in accordance with the <br />following formula: <br />W = (D/60)Z <br />Where: W is in pounds <br />D is in feet <br />Control of Access -Access to blasting areas will be controlled by road blocks and guards along roads <br />leading to blasting areas. <br />Other Safety Precautions -The following safety precautions will be strictly adhered to during surface <br />blasting operations: <br />• Audible waming signals and oral notices will be given to all persons within one-half mile <br />of the blasting vicinity. <br />• Blasting will be conducted at times announced during the blasting schedule except in <br />hazardous situations, approved by the Division, where safety requires unscheduled <br />detonation. <br />• All-clear signals of a different character than the waming signal will be given after each <br />blast. <br />Mine Permit Renewal #3 (Rev. 8/99) IV-5 <br />