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Technical Revision <br /> Menzer Quarry <br /> M-1973-009-HR <br /> Submitted June 2021 <br /> Method for Discharge of Storm Water From Sediment Basin <br /> Introduction: On April 28, 2021, the Colorado Division of Reclamation, Mining and Safety <br /> received a complaint from a nearby landowner related to water use with respect to the existing <br /> sediment pond at the Menzer Quarry. Apparently the issue was with the discharge of water into <br /> Turkey Creek made the creek run muddy. hi discussions and a subsequent inspection it was <br /> determined that discharge of accumulated storm water in the sediment pond needed to be modified <br /> such that silt discharge into Turkey Creek is reduced. <br /> This technical revision to Exhibit G -Water Information in the Menzer Quarry <br /> Reclamation Permit addresses this issue by implementing a different method of water discharge. In <br /> essence, water will be filtered prior to discharge into the stream system. Visual tests have shown <br /> that filtering the water at the discharge outlet will reduce sediment to acceptable levels with regard <br /> to water quality put back into the stream. Originally, it was thought that pumping the water out of <br /> the pond into a water truck and hauling it up into the quarry to be dumped where mining has <br /> occurred or will occur on already mined land was the best solution for both water quality as well as <br /> returning water to the total hydrologic system. That is a rather expensive solution because the <br /> water must be hauled to a much higher elevation on steep roads. Further consideration showed this <br /> approach might cause instability of the granite formation being mined. <br /> It was then found that discharging the pumped water into a fine filter sock on the outlet hose <br /> removed most of the sediment that was present in the water pumped out of the pond. Therefore, <br /> this revision describes how this system will work and be implemented. <br /> Technical Revision Menzer Quarry M-1973-009-HR June 2021 Page 1 of 7 <br />