08-28-2017 Council Packet - Laserfiche WebLink

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CITY COUNCIL AGENDA ITEM 6D STAFF ORIGINATOR: Michael Grochala, Community Development Director MEETING DATE: August 28, 2017 TOPIC: Consideration of Resolution No. 17-90, Accepting Water Storage Siting Study and Authorizing Geotechnical Evaluation VOTE REQUIRED: 3/5 INTRODUCTION Staff is requesting council authorization to accept the Water Storage Siting Study and Authorize Geotechnical Evaluation (soil borings) on four identified sites. BACKGROUND The City’s water system is designed to meet The American Water Works Association standards for system pressure and supply. The water system consists of water storage, water supply and a network of pipes. The City is responsible to continually review the system and complete improvements as outlined in the City’s Comprehensive Plan. The City has two existing water storage tanks 1 million gallons each. The Comprehensive Plan outlines the need for additional water storage. Thus the water system was further evaluated using hydrant flow tests and water system modeling. The evaluation confirmed the need for additional water storage within the next two years. The City Council authorized WSB & Associates to preparation a water storage feasibility study in December of 2016. The Water Storage Siting Study evaluated the size and type of storage, potential sites, impact to City water distribution system, and cost. Multiple sites throughout the City were considered based on elevation, ownership, proximity to trunk water lines and site access. The recommendations from the study are attached, and summarized as follows: • Four preferred sites were identified along the Birch Street corridor. Geotechnical Evaluations should be performed on the sites to determine suitability. • The recommended storage size is 1.5 million gallons • The recommended tower type is a Composite Elevated Water Storage Tank The City Council discussed the draft study at the August 7, 2017 work session and had questions regarding how long composite have been in use and the cost difference for a smaller 1.0 million gallon tank.