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2 <br /> Requests for Additional. Information <br /> Monitoring — Monitoring data, on the Purga.toire River system <br /> has been collected in strict compliance with NPDE`) permits and in <br /> accordance with agreements between CF&I and PILRD staff over the past <br /> three years. CF&I ' s reasoned approach to determining the impact of <br /> mining on the quality of water has produced sufficient data for the <br /> division to find that trace elements in the geochemical environment <br /> of the mining activity will halre no material effect on the quality <br /> of the hydrologic system. Because CFF,I has determined total <br /> dissolved solids to be its greatest contribution to the chemical <br /> degradation of the Purgatoire River system and because the division <br /> has determined that contribution to be minor and the trace elements <br /> determined to be inconsequential, the division is now in a position <br /> to reduce monitoring requirements. CF&I proposes the only <br /> monitoring now reasonably required is that required by its NPDFS <br /> permits. <br /> The division request for a. surface water budget is answered by <br /> the line drawing of Water System, Maxwell Mine, accepted as <br /> information required by the NPDES permit application. Currently, <br /> losses and gains are regarded approximately equal . As the mine <br /> develops, the river will become a. gaining stream through the Maxwell <br /> area.. <br /> Pond Dewatering — CF&I agrees to convert the manual de-watering <br /> system of the sediment ponds to an automatic system by blocking the <br /> gate valves open as suggested by the division. The opening sizes <br /> and calculations are included in the addendum to Fxhibit 16 . <br /> Watershed 13—A — This watershed (13—A) is not an area of high <br /> use for the Mine and is well suited for alternate sedimentation <br /> control. MLRD regulations do not prohibit the use of alternate <br /> sedimentation control , and CF&I requests approval of the submitted <br /> plan to utilize a straw bale filter. Watershed 13—A has not been a <br /> problem area at the Maxwell Mine. A review of the MLR inspection <br /> reports will substantiate this claim. <br /> Installation of the proposed straw bale filter would <br /> ensure additional sedimentation protection for an already stable <br /> area. <br />