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Frattalone Sewer Extension City of Little Canada <br />Serving the remaining properties in the park with sewer could also be accomplished with <br />force main, whereby all wastewater would be conveyed by pressure. If this method is chosen <br />for this project, two different alignments are possible. <br />Options <br />Providing sewer service to the eastern half of the industrial park is feasible, but more <br />expensive than in most other areas in Little Canada. The very poor soils require the <br />consideration of some non - standard methods of providing sewer service. Two methods <br />considered in this report are: <br />Method 1: placing a gravity sewer line on piling foundations, and <br />Method 2: "floating" a small force main in the soft soils. <br />Method 1 is seen as the only feasible method of serving these properties with gravity <br />sewer (see Figure 2). This would involve placing timber or steel pilings beneath ductile iron <br />pipe at 20 foot intervals. All service lines would also require pilings. This method is quite <br />expensive compared to typical sanitary sewer installation. <br />Method 2 proposes floating a small diameter (2 inch) plastic force main in the soft soils. <br />While an 8 inch gravity pipe is quite heavy, and therefore susceptible to settlement in soft <br />soils, a 2 inch plastic pipe is very light, and will tend hold its position reasonably well <br />without support. In addition, a small diameter plastic force main will be able to withstand <br />slight movements, while a gravity line must remain at a true grade. Although future <br />maintenance and operational costs are on -going with this option, up front costs are quite <br />low. <br />A force main system throughout the eastern half of the industrial park would require public <br />or private lift stations /pumps at various points. We would recommend that privately owned <br />and maintained lift stations be installed at each service location (potentially in each <br />building). <br />Two alignments (Options 2A and 2B) for the force main are studied in this report (see <br />Figure 3). Option 2A discharges into the Levitz line. Option 2B discharges into a MCWS <br />manhole at the east right -of -way line of Country Drive. <br />37225.rpt 5 <br />Page 10 <br />