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_ .. - <br />You should revise the mitigation plan to address these conoerna. You <br />should also provide tm with the following: <br />1. A sediment transport study utilizing HDC 6 or comparable ,~mputer <br />model. The study should be prepared by an engineer experienced in the <br />use of the model std should ir-clude the amwatt and rate of a headcut, <br />time for stable river recovery, amount of pier and abutment scxiur, <br />etc. Simons and Associates, Resource Consultants, or Simon iv. end <br />Associates, all located in Fort Collins, are engineering firmer with <br />experience in using sediment transport computer oodels. <br />2. A structure design, based upon the sediment transport study, <br />which provides significant protection for the two State Highrny 50 <br />bridges. The design should withstand the hydraulic forces from <br />overtopping and seepage. We assure that the structure would to <br />located on your property parallel to the bridges and would be <br />maintained by Valco. <br />The above comments and recommendations are based upon discussions with our <br />consultant, Dr. E. V. Richardson of Colorado State University, and will be <br />included in his written evaluation of your proposal. <br />Until we approve a satisfactory mitigation plan, we will continue to <br />object to your existing pit operation and to your proposed expansion to <br />the north. <br />Sincerely, <br />i g~~ <br />D~ r1Ct PCeCOnatrUCt].On EnglneCT <br />oc: U.S. Army Corps of Engineers <br />(Albuquerque/Pueblo) <br />E. V. Richardson, Colorado State University <br />