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The incidental category includes leakage from water lines, dust control watering in the <br /> haulage entries, and washdown water used in the slope and other locations. It is <br /> assumed that 10% of the water used for production equipment will fall under this <br /> category. <br /> Outgoing Water As coal is mined, water is added by dust control sprays on the <br /> continuous miners, the Iongwall shearer and at transfer points along the conveyor belt <br /> system. This water is then carried out of the mine as surface moisture on the raw coal. <br /> This added coal surface moisture represents a 4% increase in the raw coal moisture <br /> content. The raw coal tonnage produced during this reporting period was 2,295,601 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 600 F. <br /> Up until the commissioning of the new mine dewatering system in May 2012, no <br /> underground water had been pumped out since January 1996. Water encountered in the <br /> active areas of the mine was pumped to the mined out D seam area for storage. <br /> In May 2012 a new dewatering system was commissioned to pump excess mine water to <br /> the surface for treatment, storage, and potentially discharge. An average of 35.50 gpm <br /> was pumped to the surface. No discharge of the dewatering waters through the <br /> associated NPDES outfall occurred during the water year as most of the water was <br /> allowed in infiltrate through multiple ponds. <br /> Pumping resumed from the D-Seam through SDH-3 on July 1, 2015. This water is <br /> discharged through Outfall #026 following treatment involving aeration and settling. The <br /> pump was down for all of the 2017 water year, but pumping resumed in November 2017 <br /> and ran 24 hours a day, 7 days a week with some down time in January and February <br /> 2018. <br /> 2.2.1.6 NPDES Discharges At present, BME has 12 NPDES outfalls. Only Outfalls <br /> 001 and 029 discharged continually during the 2020-21 water year. 026 Discharged <br /> during part of October 2020, but did not discharge during the remainder of the monitoring <br /> period due to pump failure. Outfall 026 discharge is the result of pumping out the D-Seam. <br /> Laboratory results and DMRs for Outfalls 001, 026, and 029 are provided in Appendix F. <br /> Outfall 029 was added to the permit to allow for pumping, treatment and discharge of B- <br /> seam water from the mine workings to the surface. The facilities associated with this <br /> system were constructed and commissioned in May of 2012. <br /> 10 <br />