01-27-2014 Council Packet - Laserfiche WebLink

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MINUTES OF THE ORONO CITY COUNCIL MEETING Monday,January 13, 2014 7:00 o'clock p.m. (3. GREEN TREES ROAD SANITARY SEWER EXTENSION—RESOL UTION NO. 6358, Continued) The existing conditions of Green Trees Road consist of a private street that serves six residential projects. Each property has an onsite sewage disposal system which consists of a septic tank and a drain field. The existing municipal sanitary sewer system is located on Shareline Drive, and as part of the feasibility study, the condition and capacity of that sewer line was looked at It was ultimately determined that the municipal system does have the capacity to serve the properties on Green Trees Road. The feasibility study proposes two alternates for extending sewer from the existing gravity sewer on the eastside of Shoreline Drive. Alternate 1 proposes a 2-inch forcemain and Alternate 2 proposes an 8-inch gravity sewer. Alternate 2 would eventually eliminate the need for the pump stations. Martini noted that a gravity system is generally preferred over a forcemain due to the long-term costs associated with maintaining the pump stations. Both alternates are proposed to be constructed by use of trenchless construction methods to minimize the need for reconstruction Martini indicated under the forcemain option, it is possible, even with the trenchless construction,to put some curves in the alignment of the pipe. Martini stated the alignment of the sewer would stay within the existing right-of-way until you get to the end of the cul-de-sac. Martini noted it would be necessary to obtain an easement from the property owners to extend the sewer to each of the properties from the cul- de-sac. Alternative two is the gravity sewer option. The project would start essentially at the same point on Shoreline Drive but would require straight lines and a manhole where the ali�mment would be turned. Under this alternatie, the contractor would not able to follow the curvature of the road and would require an additional easement. Martini noted Alternative 1 is significantly less expensive than Alternative 2 and the directional drilling is able to provide some curvature on the alignment of the road. Martini noted near the intersection of Shoreline Drive and Green Trees Road there are some Indian burial mounds and that Staff has been in contact with Indian Affairs to make sure the proposed construction is taking that sensitive area into proper consideration. Martini stated the proposed alignment was picked in an attempt to minimize the number of easements required,but noted for the northern properties, it will be necessary to cross some other properties. Jesse Struve will be working with those property owners in order to obtain the necessary easements. In addition, Martini indicated they did look at setbacks and buildable areas and Staff does not believe the proposed extension impacts any of the buildable areas on the properties. The estimated cost as presented in the feasibility study for Alternative 1 was $123,600,with the idea that the costs would be 100 percent assessed to the benefitting properties for an individual cost of$20,600. Page 2 of 17