Chatfield Reallocation Change Order Letter and Project Summary Report

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Project Summary Report—December 2006 Chatfield, Cherry Creek and Bear Creek, Colorado Reservoir Reallocation Study 1. BACKGROUND. The Feasibility Cost Share Agreement (FCSA) for the study was signed on 2 September 1999. A Project Study Plan(PSP)was developed for the study outlining tasks to be performed, individual and agency responsibilities, task cost estimates and an estimated schedule. The PSP was intended to be an attachment to the FCSA and was subject to change. The cost estimates provided in the PSP provided the basis for the cost amounts set forth in the FCSA. The original estimated Study Cost was $1,984,684 with the State's share at$992,342, which consisted of cash and in-kind contributions. During the course of the study, several actions have occurred that have required and will require additional funds to complete the study and to extend the estimated completion date. These include the expansion of the impact area to include analysis further downstream than originally anticipated, seismic studies, additional flood plain mapping, conducting the hydrologic and hydraulic modeling/analysis (including some new tasks not identified in the original PSP) with in house staff after the termination of the contract, independent technical review and the additional management costs that accompany all these items. In addition,new tasks included study costs to conduct the antecedent flood study and to conduct two years of rare plant surveys. 2. PURPOSE. The purpose of this report is to provide a summary of work progress during current Fiscal Year and to update the Study costs and schedule with current best estimates. 3. TASK PROGRESS FY2006. The following summarizes progress made during FY 2006 on major tasks. • Feasibility Report/EIS. Public scoping meetings and an interagency meeting were conducted to identify possible issues that need to be addressed in the EIS. Tetra Tech has drafted chapters 2, 3, and 6 for the FR/EIS. Work is in progress, to the extent possible based on available information, on the remaining chapters. Regular progress meetings have been held(approx. every 6 weeks) to discuss the FR/EIS and obtain water user feedback and input. The Corps updated and extended their contract with Tetra Tech to continue on the study. Tetra Tech will continue work on the Reallocation Alternatives and costs that will lead to a recommended alternative. The study schedule has been revised due to unforeseen delays in obtaining necessary data and reports from oustside sources. State Parks (contract work through EDAW) continues to finalize their recreation mitigation plan for the recreation facilities at Chatfield, and will turn over the EDAW study to Tetra Tech as soon as possible. • Rare Plant Survey. Tetra Tech completed the report for the first year rare plant survey around the Chatfield Reservoir and completed the fieldwork for the second year of the survey. Tetra Tech is incorporating this work into the FR/EIS. • Antecedent Flood Study. Sponsor and Federal funds were provided to conduct the antecedent flood study. The final report and recommendations were submitted to the Corps of Engineer's Headquarters (HQ) and approved by letter. This approval was a major accomplishment in the study and technically allows for the 20,600 AF of storage space in the reservoir.