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Regarding the track record for composite water towers, the first one in the United States was <br />constructed in Southlake, Texas in 1985. Some composite water towers in Canada have been <br />around since the last 1970’s. <br /> <br />WSB prepared a comparison of estimated costs for a 1 MG hydropillar and composite water <br />tower and a 1.5 MG hydropillar and composite water tower. The estimated cost for a 1 MG <br />composite water tower is about $850,000 less than a 1.5 MG composite water tower. However, <br />as shown in the table below, the unit cost per gallon for a 1 MG composite water tower is 18.4 <br />percent more expensive than a 1.5 MG composite water tower. <br /> <br />Additionally, a 1 MG water tower would only provide enough storage until about Year 2030 <br />based on WSB’s projections. The 1.5 MG water tower would provide enough storage until Year <br />2040. The additional 0.5 MG of storage capacity would provide ten additional years of storage <br />until a fourth water tower is required in the future (beyond Year 2040). <br /> <br /> <br />Style 1.5 MG Water Tower Cost Per Gallon <br />Hydropillar $4,301,250 $2.87 <br />Composite $4,069,350 $2.72 <br /> <br /> <br />Style 1 MG Water Tower Cost Per Gallon <br />Hydropillar $3,273,000 $3.28 <br />Composite $3,218,000 $3.22 <br /> <br />Based on the report recommendations staff is requesting council authorization to complete a <br />geotechnical evaluation of the identified sites. This process would include performing <br />subsurface soil borings, classifying and analyzing the soil samples, discuss groundwater issues, <br />discuss frost susceptibility and prepare recommendations for foundation support. The completed <br />analysis will aid in determining a preferred site for the project. WSB has submitted a proposal to <br />complete borings at each of the four sites for a lump sum fee of $15,800. Funding for the <br />evaluation is from the Trunk Utility Fund. <br /> <br />RECOMMENDATION <br /> <br />Staff is recommending adoption of Resolution No. 17-90, Accepting the Water Storage Siting <br />Study and Authorizing Geotechnical Evaluation on the preferred sites. <br /> <br />ATTACHMENTS <br /> <br />1. Resolution No. 17-90 <br />2. Water Tower Siting Study <br />3. Proposal for Water Storage Geotechnical Evaluation