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Rienau #2 Mine Sediment Pond A and B Certification Report <br />There were.a number of revisions to the sediment pond <br />designs at the Rienau #2 Mine. The most recent that could <br />be located was the revision supplied by Merrick and Company <br />Engineers and Architects submitted by Northern to MLRD on <br />March 19, 1979 titled Northern Coal Company Reinau #2 Mine <br />Rio Blanco County. Modification #2 Sedimentation Control <br />Plan. This plan shows the details of the two ponds, <br />however, diversion ditches are not shown in the plan which <br />were later used. to divert most of the undisturbed area away <br />from the ponds, thus greatly reducing the pond capacity <br />requirements. The designs for this revision, which came <br />after March 19, 1979, could not be found. Therefore, I have <br />recalculated the capacity requirements of the pond and <br />compared them with the site measurements taken on July 25, <br />1980. All other aspects of the construction, such as <br />spillways, dewatering pipes, rip-rap, dam dimensions, etc. <br />were evaluated in comparison to the plans submitted on March <br />19, 1979. <br />