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of Moul7ds Vlew Staff R Item No: 7E Meeting Date: January 27 2014 Type of Business: Council Busin.ss Administrator Review: To: Honorable Mayor and City Council From: Nick DeBar, Director of Public Works Item Title/Subject: Resolution 8208, Authorizing KLM Engineering, Inc. to Perform Engineering Design Services and Prepare Bidding Documents for Rehabilitation of 2 -MG Ground Reservoir Background: In September 2013, the City Council authorized Inspec. Inc. to perform final design services and prepare bidding documents for reroofing and masonry renovation of the 2 -million gallon (MG) ground reservoir, booster station, and municipal well no. 2 (Res. 8158). KLM Engineering was also authorized to inspect and evaluate the interior wall coatings of the reservoir, including any unsafe OSHA conditions. During these inspections, it was discovered that larger issues exist with the ground reservoir structure that require a different approach to keep the reservoir serviceable and functional into the future. Discussion: The reinforced -concrete ground reservoir was constructed with the booster station in 1968 and has had minimal maintenance or improvements since constructed. The interior wall coating is in poor condition with approximately 75% overall failure. There is some evidence that leaks are occurring through the wall, however, it is not excessive and well below that of industry standards (AWWA). The overall interior of the reservoir is in fair to good condition. However, the inspection noted several hundred feet of cracking, spalling on the interior concrete walls, and many defects such as popouts and exposed reinforcement bars. In addition, the concrete roof is infiltrating ponded rainwater into the reservoir through cracks and construction joints. Structural improvements are also needed to meet current OSHA requirements. A copy of KLM's inspection report was previously provided to the Council for your information. Attached is KLM's updated cost estimate and recommendations for rehabilitating the ground reservoir. The updated cost estimate to perform the repairs and rehabilitation is $407,100. This work includes interior structural repairs, interior steel coatings, exterior structural repairs, and coating of the exterior roof and flashing. This work is recommended to be performed before any masonry renovation since it will address issues causing the masonry deterioration. KLM has informed Public Works that if rehabilitation work is completed to the reservoir, the reservoir should be serviceable and function for the next 30 to 40 years. In comparison, replacing the reservoir with a new tank is estimated between $3.5 to $4.5 million To make matters more pressing, Public Works needs to have the reservoir back on-line prior to the irrigation season (June 1). While the drinking water system could meet the typical summer demand, it would be much more wear and tear of the well pumps and motors and may require a ban on lawn sprinkling. KLM estimates 6 to 8 weeks for rehabilitation work to occur. Recommendation: Staff recommends that the City Council adopt the attached resolution authorizing KLM to perform engineering design services and prepare bidding documents for rehabilitating the ground reservoir. Monies have been budgeted under the water enterprise fund (700-4823-7050) for $350,000. Depending upon actual bids received, a future recommendation will be made regarding the reroofing and masonry renovation of the booster station and municipal well no. 2. Although important, these improvements are not as urgent as the reservoir rehabilitation. Respectfully submitted, t ti Nick DeBar— Director of Public Works