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Page 2 <br />Letter to Carol Pahlke <br />January 2, 1981 <br />B. December 18, 1980 Memorandum to Carol Pahlke from Jerry <br />Zimpfer. <br />1. Item #3 in my original memo was not clearly worded, and <br />therefore, the applicant has provided the same response to my <br />question #3 and #4. I will attempt to clarify. The application <br />indicates that the post-mining surface is designed to retain pre- <br />cipitation as much as possible within seeded areas. In addition, <br />the applicant expects increased recharge following mining as a <br />result of the increased recharge area. These effects would de- <br />crease runoff from the post-mining surface. (This decrease <br />would be in addition to that resulting from sediment ponds, and <br />would continue to occur after sediment ponds are removed.) The <br />applicant should estimate the amount of runoff from the reclaimed <br />surface, and the amount of flow reduction in each receiving stream. <br />Response: The amount of flow in Bolton, Bush, Williams <br />and Sudduth Draws will be reduced during mining and re- <br />clamation by detention and sedimentation ponds. During <br />this time, water from precipitation will be retained as <br />much as possible within seeded areas by countour furrow- <br />ing. However, as explained at revised pages 780-126eeeee <br />and 780-126fffff, this retention will not occur after the <br />sedimentation ponds are removed. The increase in recharge <br />area is balanced against an expected decrease in filtra- <br />tion rates, thus the post-mining recharge rate should approx- <br />imately equal the pre-mining recharge rate, and stream flow <br />will not be reduced following reclamation. In fact, it is <br />predicted at revised pages 780-126fffff and 780-126ggggg <br />that runoff on the reclaimed surface will increase by 358 <br />over the pre-mining condition. As requested, the amount <br />of flow change in each receiving stream is provided at <br />revised pages 780-126fffff. <br />Revised Pages: 780-126eeeee--780-126ggggg have been <br />attached hereto. <br />2. The applicant failed to address part of item #6 in my <br />November 7, 1960 memo. The applicant should estimate the amount <br />(quantify) of salt loading on receiving streams as a result of <br />mining and reclamation activities. <br />