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. . . 3 . As-built plans, certified by a registered professional engineer, of all proposed project elements . Community acknowledgment of the map revision request . Certification that all fill placed in the currently effective base floodplain and below the proposed base flood WSEL is compacted to 95 percent of the maximum density obtainable with the Standard Proctor Test method issued by the American Society for Testing and Materials (ASTM Standard D-698) or an acceptable equivalent method for all areas to be removed from the base floodplain . An officially adopted maintenance and operation plan for the proposed water-quality pond and culverts. This plan, which may be in the form of a written statement from the community Chief Executive Officer, an ordinance, or other legislation, must describe the nature of the maintenance activities, the frequency with which they will be performed, and the title of the local community official who will be responsible for ensuring that the maintenance activities are accomplished. . Please provide documentation of individual legal notice to all affected property owners within and outside the community explaining the impact of the proposed action on their property. . In May 1999, FEMA formalized a Cooperating Technical Community (CTC) agreement with the Urban Drainage and Flood Control District (UDFCD) to coordinate flood hazard mapping efforts within UDFCD. The agreement works in conjunction with UDFCD's Flood Hazard Area Delineation and Maintenance Eligibility Programs. Because your community is served by UDFCD, please submit an acknowledgement letter from UDFCD stating that they have been officially notified of this revision request. In addition, if this project is a part of UDFCD' s Maintenance Eligibility Program, the letter must state that the project has been completed in accordance with UDFCD's program requirements. Mr. Bill DeGroot, P.E., Chief, Floodplain Management Program, UDFCD, is the CTC Coordinator for the agreement and can be reached at (303) 455-6277 for further information regarding this requirement. . At several locations along the revised reach, the channel distances shown in the output of the proposed conditions model do not match the approximate channel distances shown on the above-referenced plans. At Cross Section 950, 400 feet does not match the approximate 500 feet; at Cross Section 1590, 640 feet does not match the approximate 400 feet; at Cross Section 271 0, 245 feet does not match the approximate 570 feet; and at Cross Section 4660, 300 feet does not match the approximate 80 feet. Please make the appropriate changes, or provide an explanation for these discrepancies. . The culvert modeling in the proposed conditions model does not follow the culvert modeling guidelines described in the HEC-RAS Users Manual, prepared by the U.S. Army Corps of Engineers, dated April 1997. For example, ineffective flow areas must be placed at the upstream and downstream ends of culverts. Please provide modeling that corresponds with the guidelines used in the HEC-RAS Users Manual and ensure that the data entered in HEC-RAS is consistent throughout the model, or provide an explanation for the culvert modeling used in the proposed conditions model.