08-24-1998 Council Packet - Laserfiche WebLink

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III. Sanitary Sewer The proposed sanitary sewer for the Orono Orchard area is shown on Figure 2. review of the project site indicates the routes shown on the figures are recommended from a construction standpoint. All residents in the project area would be served by a gravity sewer. The proposed sewer would be constructed using the directional boring method on segments BHG and FCDE. Segments HI and AC would be installed by the open cut method, A lift station would be constructed along Orono Orchard Road and would pump flows into an existing Metropolitan Council Environmental Services (MCES) forcemain. Mainline pipe will be 8-inches in diameter and either HDPE or PVC depending on the method of installation. Sewer services to each home will be 4-inches in diameter. Services will be extended to the property line. The actual connection between the home and the sewer stub will be the property owners responsibility. Estimated costs are shown in the Appendices. An additional design to serve the properties identified as 21,22 and 23 on L>'man Avenue is shown on Figure 4. This pipe would be directionally bored and the street excavated only at the manhole locations. These properties could be included in the project or this sewer segment could be constructed sometime in the future. Property owners should be contacted to determine interest and sewer needs. Cost estimates for this segment are shown in the Appendices as the Lyman Avenue Option. The proposed manholes on Lyman, Smith a.nd Woodhill Avenues would be constructed in the roadway. All sewer pipes, manholes and the lift station along Orono Orchard Road will be installed off of the street on the golf course side. Disturbed street areas will be restored with 1 Vi inches of bituminous wear course, 2 inches of bituminous base course, 12 inches of aggregate base and geotextile stabilization fabric. An alternate design using the open cut method of installation for all pipes shown on Figure 2 was considered. This alternate would increase the total project cost by 37 percent and severely restrict access during construction. A cost estimate for the alternate design is included in the Appendix. Orono Orchard Sanitary Sewer Improvements