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. ~ <br />Mr. Jce Dudash, CDMG <br />January 22, 1996 -page 2 <br />obtained from reclaimed azeas rather than disturbed azeas prone to inflated sediment values. Our inten- <br />tions aze to use SEDCAD modeling to reflect runoff values and sediment levels. <br />The full suite chemical analysis would continue to be taken a[ the discharge points. Detention times <br />within the sediment control ponds should not affect the chemical parameters of the water. In many of <br />the drainages at Trapper Mine, runoff from snowmelt or storm events may not reach the NPDES <br />system or only in sufficient quantities to partially fill the uppermost control structures. In such cases, it <br />may be possible to obtain a sample from the uppermost sediment control pond which would reflect <br />runoff values. <br />The issue of water quality sampling relative to bond release demonstration needs to be incorporated into <br />Trapper's Mining and Reclamation Permit. This program may take some time to resolve. Therefore, <br />Trapper would like to handle this as a separate, future revision package. <br />4: :::Seep Analysis::. <br />The spoil seeps at Trapper Mine razely exceed the 5 GPM flow rate. Under conditions of the past few <br />years, flows are such [hat in only one drainage would the seep discharge enough [o enter the NPDES <br />system. In most cases, the seep flows aze so low that flows are difficult to measure or obtain an ade- <br />quate sample. Therefore, the usefulness of a sampling program of flows insufficient to affect a drain- <br />age is questionable. What would be the Division's purpose be in using the seep information? We do <br />not feel that there is a demonstrated need for additional seep monitoring. <br />If you have any questions or comments, please contact me. <br />Sincerely, <br />~~~ <br />Forrest V. Luke <br />Environmental Manager <br />LWWjsb <br />~DMG~ANN-REPr <br />CDMMENrlt <br />IU9.3.1A <br />No¢baot <br />