01-13-2014 Council Packet - Laserfiche WebLink

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SUMMARY AND CONCLUSIONS 1. The preparation of this feasibility study was authorized by the Orono City Council in response to a petition received which requested extension of municipal sanitary sewer service to properties on Green Trees Road. 2. The study proposes two alternates for extending sewer from the existing gravity sewer on the east side of Shoreline Drive. Alternate 1 proposes a 2-inch forcemain and Alternate 2 proposes an 8-inch gravity sewer. Both alternates are proposed to be constructed by use of trenchless construction methods. The sewer extensions are shown on Figures 1 and 2 in the Appendix. 3. The existing sanitary sewer system has adequate capacity to accommodate the proposed extension. 4. The total estimated project cost is $123,647 for Alternate 1 and $415,207 for Alternate 2 which include allowances for contingencies and soft costs. 5. The project cost is proposed to be funded by Special Assessment to the six properties on Green Trees Road that will benefit from the sewer extension. The estimated assessment rate is $20,608 per parcel for Alternate 1 and $69,201 per parcel for Alternate 2. 6. In addition to the ass�ssment for the sewer extension, each parcel connecting to the sewer will be subject to one-time Orono and MCES connection/sewer availability charges and costs for abandoning the existing onsite sewer systems and for the service connection from the house to the service stub. 7. Both improvement alternates proposed within are feasible from a technical perspective. Alternate 1 is significantly lower in cost. The advantage offered by Alternate 2 is gravity sewer service is provided to each parcel which is typical for the majority of the sewer connections in Orono. The gravity service eliminates the need for a grinder pump station on each Iot which is required for Alternate 1 to pump sewage into the forcemain. Page 1