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<br />WS – Item #3 <br /> <br />WORK SESSION STAFF REPORT <br />Work Session Item No. 3 <br /> <br /> <br />Date: February 5, 2018 <br /> <br />To: City Council <br /> <br />From: Diane Hankee, City Engineer <br /> <br />Re: Water Storage Siting Update <br /> <br /> <br />Background <br /> <br />The Water Tower Siting Study, dated August 7, 2017, identified four potential sites for <br />the proposed 1.5 million gallon (MG) water tower. The City Council authorized a <br />contract for geotechnical evaluations for the proposed sites on August 28, 2017. A map <br />of the proposed water tower sites is attached. <br /> <br />Staff proceeded first with the geotechnical evaluation for the Tower Site No. 2 (City <br />property by Fire Station No. 2 at Birch and Centerville Road). The results of the analysis <br />determined that the soils at this site are not suitable for supporting a spread foundation <br />system and will require structural pilings. The following is a summary of the site <br />evaluations to date: <br /> <br />Site 1 – Birch Street and Timberwolf Trail (School District Property) – No <br />borings completed at this time. The School District is not ready to make any <br />long-term commitments as they are determining their plans for the future. <br /> <br />Site 2 Birch Street and Centerville Road (City Property) – The site is located <br />on City-owned property and close to existing 16” trunk watermain. The <br />geotechnical evaluation determined that this site would require structural pilings <br />to reach suitable soils that can support a water tower. Structural pilings could add <br />$200,000 to $400,000 to the water tower construction cost. Site 2 is also located <br />within the White Bear Lake 5-mile buffer zone. Due to the recent court order the <br />DNR has recently denied dewatering permits to developers of proposed <br />construction projects within this zone. While dewatering may not be required at <br />this site, based on the groundwater elevations observed in the recent soil borings, <br />permitting timelines is a consideration. <br /> <br />Site 3 – Birch Street and 12th Avenue South (Privately Owned) – The site is <br />located on privately owned land and close to existing 16” watermain. Further <br />evaluation showed that there may not be enough open land on this site to <br />construct and maintain a 1.5 MG water tower. <br />