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are extremely dramatic as is evident in the cheroograph depicted in . <br />Figure 3. The mean TDS concentration for the period ~~f record is <br />1189 mg/1, fluctuating between approximately 600 mg/1 during <br />mid-summer and 1800 mg/1 during mid-winter. <br />Comparison of the data from year to year indicate that the <br />quality of this water has remained essentially unchanged since <br />monitoring began in October 1979. Comparison of October 1979 <br />water quality to that of October 1985 (see 'fable Si of Section <br />V.B.2.d.) indicates that the quality of water on Tuttle Draw at <br />Sk'-N1 has not changed within the past six years with respect to <br />virtually all of the reported parameters. <br />2. NPDES OD2 and 003 <br />NPDES discharge points 002 and 003 (Permit Plo. CO-0000213; see <br />Appendix 7-6) are located along the southern edge of the <br />scraper area on the northside of Tuttle Draw. To date, neither <br />of these discharge points have been known to discharge. Discharge • <br />monitoring reports for the past three quarters of 1986 are provided <br />in Appendix C. Because the present storage capacity and spillwzy <br />configuration of the 002 pond are inadequate (see Appendix 7-1 of <br />the Nucla Mine Permit Revision), this pond has been redesigned. Up <br />until and upon reconstruction, the pond will continue to be <br />monitored for flow and quality according to the requirements of the <br />NPDES permit. Regarding the 003 pond, PCC: has requested an <br />exemption from the requirements of the sedimentation pond <br />regulations. The existing structure drains a very small drainage <br />area including a reclaimed haul road, the immediate reclaimed area, <br />and the area around the existing sedimentation structure. No new <br />mining disturbance is planned in this watershed. The existing <br />structure has a capacity of 261 cubic feet and would continue to <br />perform the function of a sediment trap until bored release is <br />approved for this area. Any new excavation and remedial work on <br />the existing structure could possibly disrupt the overall <br />hydrologic balance of the watershed more than leaving the present • <br />conditions undisturbed. <br />20 <br />