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around the seep and ditch and mitigates any acidic content of the seep prior to reentry <br />into the ground. <br />ExFdosives and Blasliag <br />Currently there are no explosives used or stored on-site. At such time as mining <br />resumes and the need for blasting products is determined, OEI will revise and update <br />the blasting information. <br />Ammonium nitrate prill and dynamite were used during mining. Explosive quantities <br />to be used have been provided in Appendix 5-5. All blasting will be initiated by the <br />use of electric detonators, as described in the blasting plan packet. <br />The blasting plan provides for the retention of blasting records (logs) showing: <br />• Drilling patterns, column size, number of holes, spacing of holes, and depths <br />(based on professional studies by Mr. Don Howell conducted for the Cazbon <br />Junction Mine). <br />• Chazges and packing of holes will be specified. Initially, primacord will be used as <br />the detonator (fuse) with case primers and/or dynamite until the mining azea is <br />enlarged. Thereafter, electric detonation devices will be used with the appropriate <br />timing sequences and detonation controls. <br />• At all times, the sequence and timing of firing holes will be controlled and a delay <br />pattern sketch will be made with each blasting incident. <br />Blasting warning signals and access control have been addressed in the blasting plan <br />(Appendix 5-5). <br />No blast monitoring equipment is necessary as the neazest buildings aze in excess of <br />1,000 feet away. The nearest public building (structure) is in excess of 3,000 feet <br />distant. OEI will restrict the maximum weight of explosives to be detonated in any 8 <br />millisecond period to 2,500 pounds. <br />If pre-blasting surveys are required, they will be conducted in accordance with current <br />CDMG regulations. <br />If unavoidable hazardous conditions occur, (e.g., electrical storms, misfires, personnel <br />sickness or injury, equipment breakdown), appropriate actions will be taken in <br />accordance with all applicable parts of the regulations. <br />• <br />Technical Revision OS (v 1.3) 5-16 Revised 9/1997 <br />