Laserfiche WebLink
1 <br />' Inaoina Water The production equipment utilizes water for dust control and cuttings removal <br />' in roof bolting. Water used by equipment is based on 550 shifts worked by continuous miner <br />sections and 191.5 shifts worked by the longwall. The continuous miner sections use 100 <br />gpm and operate about 4 hours per shift (the rest of the time is spent moving, etc.). The <br />longwall equipment uses 300 gpm of water for about 9 hours per shift <br />' The amount of water entering the mine as ventilation intake air humidity is based on monthly <br />mean temperatures from Figure II.C-2 on page II.C-9 of the Mining Permit and the yearly <br />mean relative humidity of 56% found on page II.E-1 of the Mining Permit. The absolute <br />' humidity, the actual amount of water in the air, is calculated from these data and an average <br />ventilation quantity of 450,000 cubic feet per minute. <br />' The smallest quantity of water entering the mine is the incidental category. This category <br />includes leakage from water lines, dust control watering in the haulage entries, and <br />' washdown water used in the slope and other locations. It has been assumed that 10% of the <br />water used for production equipment will be used under this category. <br />' Outaoina Water As coal is mined, it is wet by dust control sprays on the continuous miners, <br />the longwall shearer and at transfer points along the conveyor belt system. This water is then <br />' carried out of the mine as surface moisture on the raw coal. This added coal surface <br />moisture represents a 2% increase in the raw coal moisture content. The raw coal tonnage <br />' produced during this reporting period was 1,413,658 tons. <br />Water leaving the mine as ventilation humidity represents a large quantity in the water <br />' balance. The temperature of the exhaust ventilation air is almost constant, at 60° F. <br />No underground water has been pumped out since the fire episode. The underground water <br />' will be left to fill the mined out areas. <br />' 2.2.1.6 NPDES Discharges At present, BME has 15 NPDES outfalls. Only two outfalls <br />(DP1 and SS1) experienced discharge during this monitoring period. Outfalls 024 and 026 at <br />the sump dewatering holes are not discharging since the January 31, 1996 underground fire <br />' episode. All discharges were within the permit requirement. <br />' 2.2.1.7 Whole Effluent Toxicity (WET) Testing No WET testing was conducted during the <br />water year since there was no discharge of the underground water from the sump dewatering <br />holes or from outtall 004 (Pond PP2). A history of WET testing at Deserado Mine follows <br />' below: <br /> <br />' e <br />