2003-08-27 CC Packet - Laserfiche WebLink

Home Browse Search

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