2003-08-27 CC Packet - Laserfiche WebLink

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foundation with bearing. The presence of the bedrock means that the piles can be driven to refusal into the bedrock and can achieve a 100 ton capacity with a high degree of certainty. The piles will be either concrete filled pipe piles or H-piles. The exact pile configuration and type will be determined during the design phase of the project. There is an additional advantage to the pile foundation in that the ringwall portion of the foundation will extend to only 6-7 feet below grade. It is anticipated that this excavation will be reasonably dry. The inlet/outlet fill pipe will then go just below this ringwall foundation between two of the piles. If the spread footing were to be considered at a 13-14 foot depth, it is anticipated that significantly dewatering costs would be encountered. Site Size Requirements The minimum area normally required for maintaining an elevated water tower of this size is approximately 250' x 250'. During construction of the tank, an additional100-foot construction easement is desirable on at least 2 sides (a 350' x 350' square site). This gives the contractor room to centrally store excavation materials and fabricated steel plates around the tower. This site is approximately 150 feet wide by 300 feet long. Additional space for construction equipment and material storage will be necessary either south or east of the tank site. Future maintenance on the tower, such as repainting would also require either additional space or extra care in containment. Site Access Site access is required for tank maintenance and storage inside the tank structure. The existing Public Works driveway will provide an excellent access point for the tower, and eliminate the need for a permit from Anoka County. Paving of the lot for parking and for public works use has been included in the cost estimates for the proposed tower project. Water Tower Feasibility Report 16