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<br />J <br />I <br /> <br />i 1 <br /> <br />, I <br /> <br />c:, <br />J <br /> <br />...-~ <br /> <br />I ' <br /> <br />c~i <br /> <br />Site Analysis <br /> <br />General <br /> <br />The 1997 Comprehensive Water Plan recommended a location of the water tower near City <br />Hall. Sufficient room for a tower is not available at this site, so alternate locations were <br />evaluated. In the initial phases of this report, both the City Public Works site and the Cedar <br />Street County Park site were evaluated as shown on Figure 2. Discussions were held with <br />City CounciVStaff and the Cedar Street County Site was eliminated due to the extra cost it <br />would take to purchase the property from the County and its location in the extreme <br />southeast comer of the City. <br /> <br />Soils Investigation <br /> <br />One of the most important site design considerations for an elevated storage reservoir is the <br />allowable soil bearing capacity. This capacity directly impacts the foundation design and <br />total project cost. Because the site selection was essentially concentrated at one location, it <br />was decided to perform the normal "design phase" soil borings during this report phase. The <br />soil borings that are typically performed during the design phase for an elevated water <br />reservoir consist of three standard penetration test borings. Normally, two of the test borings <br />are taken to a depth of approximately 40-50 feet and the third boring is taken to a deeper <br />depth in the event that a deep foundation system must be utilized. Ideally, an elevated tank <br />rests on a shallow foundation. This shallow foundation consists of a vertical ring wall <br />section supported on top of a wider spread footing foundation. Under this arrangement, it us <br />desirable to have the inlet/outlet pipe protrude through the vertical ringwall portion of the <br />foundation at seven feet of cover. This typically means that the bottom of the spread footing <br />is 13-14 feet below grade. <br /> <br />The standard penetration borings show that the primary geological deposit at the site is a <br />glacially deposited till. Till soils generally include classifications of sandy lean clay, clay <br /> <br />Water Tower Feasibility Report <br /> <br />14 <br />