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Page 2 <br />and those designs and specifications can be found in the permit file. Facilities in both drainages <br />were based upon modeling of the respective drainages, as evidenced in the file. The most thorough <br />modeling of the west drainage was done as a part of the 1989 amendment when the Board required <br />a drainage analysis that compared the contribution of water discharge of that drainage with the <br />entire watershed of Williams Canyon and typical discharges in that drainage. That modeling is a <br />rather large addendum to the 1989 amendment and is a part of the permit file. <br />2. The reclamation plan prepared in 1994 specifically states that the sediment basins will be allowed to <br />fill at the end of the operation and will be turned into wetland or near wetland units. It does not <br />appear that specifically backfilling these basins was required in the approval of the 1994 amendment <br />because the designs of the basins are such that they will remain functional through the duration of <br />the reclamation process and even after reclamation and will eventually become vegetated areas. It <br />appears that was acceptable in 1994 and was approved in the plan. A similar approach was used in <br />1989 even though the sediment basin designs used in 1989 differ somewhat from those provided in <br />1994. In effect, these sediment basins are intended and designed to be self-reclaiming. <br />If you have any questions regarding the responses, please contact myself or Mac Shafer. <br />Sincerely, <br />Mark A. Heifner <br />cc: Mac Shafer