CT2016-2452 Approval Letter - Laserfiche WebLink

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St.Vrain and Left Hand Water Conservancy District Agenda Item 24a July 16-17,2014 Board Meeting(Updated July 18, 2014) Page 3 of 5 Water Rights The water rights impacted by this project include: TABLE 1: IMPACTED WATER RIGHTS Appropriation Adjudication Water Court Name Amount Date Date Case No. Rock'n WP Ranch Lake No. 4 880 AF 4/23/1992 5/3/1995 88CW74 Rock'n WP Ranch Lake No. 4 600 AF 12/19/2001 4/26/2006 01CW262 Rock'n WP Ranch Lake No. 4 Change in Use NA 12/19/2007 02CW334 On average the District annually provides 200 acre-feet of augmentation water to its members, though is contracted to provide over 240 acre-feet of augmentation water. Project Description The goal of this project is to repair the Lake, allowing the District to regain its use as a water augmentation reservoir. The District has retained the engineering services of Deere and Ault Consultants, Inc. to provide feasibility level engineering. Engineering Firm Request for Proposals were submitted on June 30, 2014 and interviews will be conducted on July 18, 2014. A design engineer will be selected by Boulder County and the District in July 2014. Alternative 1 - Do Nothing: This alternative is considered unacceptable. Failure to restore the Lake would leave most of the District's augmentation plan members without an augmentation source to replace their depletions, causing the State Engineer to curtail those depletions. Alternative 2 - Rebuilding with Improvements: FEMA will not provide reimbursement for any improvements to the Lake that are not required by new or updated standards. The Division of Water Resources Dam Safety Branch did not identify any additional improvements required to bring the Lake into compliance with current standards. With the high cost of rebuilding, and the historic infrequency of this magnitude of flood event, the District and Boulder County have determined improvements beyond Dam Safety's requirements and FEMA approved repairs are not feasible. Selected Alternative 3 - Reconstruct to Pre-Flood Conditions: This alternative will reconstruct the damaged facilities in the same location, size, and for the same function as the pre-flood structure. The breached clay liner and earthen embankments will be rebuilt and all debris and sediment deposited during the flood event will be removed. The Project will also ensure any needed repairs to the Lake's measurement and delivery structures are performed so that the Lake can be used and administered as an augmentation delivery structure. FEMA's Cost Estimating Format (CEF) Cost Estimate is $9,000,000 as shown in Table 2. TABLE 2: FEMA's CEF Cost Estimate Task Cost Engineering Design $250,000 Project Management $250,000 Construction $8,250,000 Construction Contingency (3% of Construction) $250,000 Total $9,000,000 Schedule: Final Engineering is expected to occur during summer and fall of 2014. Construction has a planned completion date of May 2016.