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b <br />The attached diagram shows a portion of the mine map for the RSN <br />and the proposed pumping sequence to get the water out of the <br />mine. Location 1 represents the pump near the operating face <br />where the dirty water is generated. It is pumped to a small sump <br />at location 2 where it has a short settling time before it is <br />pumped to the top of the 3rd North Mains. From the top of the <br />3rd North it flows on the ground to location 3, the North Sump. <br />Here the water has from 1 to 3 days residence time. Currently <br />this water is pumped from this location to the surface through <br />the pump located at Location 7, 5 and 8 with less than a half day <br />residence time along the route. water from Locations 5 and 6 is <br />combined with this discharge at a random interval. The proposed <br />pumping sequence from location 3 to the discharge point involves <br />pumping to location 4, the Main Sump, where it is combined with <br />water pumped from location 5. A pump at location 4 is used for <br />the mine water supply system. The excess water from this sump <br />will be piped to the sealed area of the No. 1 East Mains to be <br />mixed with the normal flow from behind the seals. From location <br />6 the water will be gravity piped to location 7 for pumping to <br />location 8 where it will be pumped for discharge. Locations 4 <br />and 6 will add an estimated 4 days to the residence time and will <br />allow a more uniform mixing with water from locations 5 and 6. <br />Most of the piping has been installed to accomplish this pumping <br />change. A pressure switch to activated the pump at location 8 <br />is the only thing holding up the change. The switch has been <br />ordered and should be in by the May 29, 1996, implementation <br />dated given in the NOV. if this does not take care of the <br />problem, water will be pumped to the abandoned panel opposite <br />location 2 for longer settling time. <br />Please let me know if you have any further questions. <br />Sincerely, <br />J~j~~~~~ <br />Larry M. Reschke <br />LMR:lmr <br />cc: Colorado Department of Health, WQCD <br />U. S. Environmental Protection Agency <br />Dick Reisinger(WACC) <br />MT51496 <br />