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Please provide modified hydrology designs for any culverts or ditches that will <br />receive the addi[ional flow. Please show any new structures on an appropriate <br />map. The revised NPDES permit states that mine venter discharge may <br />commingle with surface runoff in pond C. If the mine water will be ptrt into pond <br />C before discharge, please update the designs for that pond, as well as the <br />designs for any culverts and ditches, including Old Highway 133 culverts and <br />road ditches, involved in the flotiv path. Obviously, these designs wozrld need to <br />be approved 6y the Division before the mine water could be routed through the <br />drainage control system. <br />The revised NPDES permit also stales that domestic waste water treatment will <br />commingle with pond B surface runoff water. If Bowie Resources wishes !o, the <br />discussion and modifications that will be necessary for the waste water addition <br />can be provided with this revision. <br />The Division's response to this question is covered in the response to item 9a <br />above. <br />9c. Once mine water discharge is transported over the Deer Trail Ditch and the Fire <br />Mountain Canal. what will be the effect ojthe water quantity and quality on <br />downstream users ? Please add this discussion to the probable hydrologic <br />consequences section, per Rtrle 2.0~.6(3)(b)(iii). Include in this discussion <br />whether this discharge can possibly adversely affect the North Fork of the <br />Gunnison Alluvial Valley Floor or any prime farmland. If structures will be <br />added to pipe the mine water discharge into the North Fork of the Gunnison, <br />please add this discussion to the permit, along with pertinent designs. If any <br />such structures are built that go beyond the current permit boundary, then, a <br />revised permit boundary that includes these structures, and appropriate right-of- <br />entry information for that new permit land, need to be supplied. <br />The Division's response to this question is covered in the response to item 9a <br />above. <br />24. The PHC arRl the Hydrologic Reclamation Plan presented with the revised text do not <br />adequately address the potential for perpetual discharge from the mine. The Hydrologic <br />Reclamation Plan stoles t{tat no hydrologic reclamation plan is proposed for potential <br />mine discharge. The potential for discharge from the portals (once mining has ceased) <br />should be evaluated and included in the PHC portion of the revised text. <br />The Division has no further concerns. BRL responded that the present permit application <br />contains a discussion of and designs for watertight portal seals. This information is found <br />