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REX E LOESSY PE 3037719652 P.05 <br />• • <br />1998/1999 set in, Sierra plans to stabilize the surface of this road with crushed rock or road bast <br />material. <br />h Water: The primary non-potable water use at the quarry is for cooling, dust control, <br />and saw cuttings flushing of the diamond wire saws, chain saws, and drills used in the stone <br />cutting operations. Each saw (there are ti planned) requires a steady flow of 5 to 10 gallons per <br />minute. The continuous circulation rate is estimated et a maximum of 30 gallons per uthrute. <br />This rate is not consumptive since the water is reused from settling ponds and sumps in the <br />quarry. Water from seepage into the quarry from surrounding formationv is the source of this <br />circulating, non-potable water requnement. Past experience by CYMC indicates the quarry <br />generates excess water in the sumps during spring runoffperiods. At these times, some water <br />needs to be discharged (see paragraph "e" above). Shown on the following page is a copy of <br />Sierra's discharge permit with the Colorado Department of Health. The discharge point <br />approved in this permit is shown onExhibit E -Mining Plan Mep and labeled as "Outfall 001." <br />An initial sample of dischazge water was taken 5!24/99. It showed the discharge water h~ pl~l <br />of 7.72, total suspended solids of 2l mgll, and total dissolved solids of 137 mg/1. These results <br />are well within acceptable limits established by the Colorado Department of Heath. Potable <br />water will be brought to the sight as required. Sanitary waste facllties will be portable toilets <br />end will not require water. No change room facilhies will be located on site and no related water <br />use will be required. <br />Iih Cround and Sttrta a Water. The sediment control structure constructed by CYMC <br />has not been effective in preventing calcium carbonate fines from reaching Yule Creek at the toe <br />of the waste piles. According to CYMC personnel, a higher rate of sedimentation has occurred <br />only since the new road around the east side of the south waste pile waa constructed in 1998. <br />Appet•ently, the excavation work for this new road mobilized signifcant quantities of tines. <br />CYMC had also dumped waste blocks into and on top of the sediment control structure. As a <br />result, the structure has appazently failed because sediment was reaching the Yule Creek in the <br />spring of 1999. <br />There has been no other significant effect on the quantity end quality of ground water or <br />surface water from CYMC's past operations, and none is antkipated with Sierra's operations. <br />Sierra has prepared a 5tormwater Management Plan incompliance with the Hiles defined by the <br />Water Quality Control Division of the Colorado Department of health This plan includes the <br />use of East Management Prncti«s for storm water. As noted above in paragraph "c," until the <br />damage caused by CYMC is corrected, Sierra will not place additional fuzes on the waste piles. <br />This course of action by Sierra has been approved by the Cobrado Department of Health (This is <br />not final yet - I am still working on it with John Kubic of the Dept. of Heath). <br />The diesel fuel tank is placed within a heavy membrane lined berm structure whose <br />volume exceeds the capacity of the tank. Operating practice will include keeping the drschazge <br />valve of the main tank closed and locked dtuiftg non-operating hours. <br />