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• Mr. Richard Mills <br />July 27, 1988 <br />Page 3 <br />Several factors should be considered in the accompanying drawings. <br />In particular, the proposed improvements are based solely on the <br />information you provided to us. This information consisted of <br />topographic mapping at a scale of 1 inch 500 feet with a contour <br />interval of 25 feet. In addition, the proposed postmining topography <br />from which the stream profiles were drawn may not precisely represent <br />the actual reclaimed topography. The gradient of specific reaches of <br />stream channel may vary by several percent from the proposed gradients. <br />The proposed channel does not follow the existing channel alignment <br />at the extreme downstream end of the channel. According to the mapping <br />you furnished, the existing channel turns approximately 90 degrees prior <br />to intersecting Foidel Creek. Since flow in the Channel is super <br />critical, we propose to bypass the existing alignment and continue the <br />new channel to within 50 feet of Foidel Creek. The lower most 25 feet <br />of the proposed channel will consist of a flat transition section <br />intended to dissipate some of the flow energy prior to entering Foidel <br />Creek. Refer to sheet 2 for the proposed alignment. <br />. We appreciate the opportunity to be of service. If you have any <br />questions about this letter or the drawings please give us a call. <br />Very truly yours, <br />Water Engineering and Technology, Inc. <br />By: Mark R. Peterson, P.E. <br />Senior Engineer <br />MRP:sp <br />Enclosure <br /> <br />_ _~ <br />