Minutes 09-06-2012 - Laserfiche WebLink

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areas with the number of parcels served and cost per parcel. The 8 red lines represent the possible sub-areas of the sewer infrastructure that could be considered, if the entire concept project is not feasible. The sewer infrastructure routing was estimated based on the topography taken from maps rather than from any field work. In order to get to a greater level of detail or certainty on the cost, some field work would be required. There are two brown areas on the map that the County has identified as some subsurface disposal or some suspected contamination. Without any further investigation, the sewer line has been routed no closer than 100 feet of that margin. The total construction and installation cost for the concept level sewer is approximately $5.8 million. It would serve 86 additional parcels of land. The concept costs include construction, engineering design, administrative and contingency for possible rock. The topography of the neighborhood is complex and the land falls in several different directions. This concept plan does not include the costs of any property acquisitions or easement acquisitions. The availability hookup charge for each of the parcels is based on an assumed average house size of 2,500 square feet. When a customer connects to the OWASA water and sewer system, there is a one-time fee that is estimated to be $4,300 for the concept plan. Cost estimate Summary: Engineering , Design and Permitting 376,350 Construction Cost 3,763,506 Construction Administration 188,175 Construction Inspection 188,175 20% Contingency 903,241 Sub Total 5,419,447 Service Availability Fees 368,768 Total 5,788,215 The concept does not include the cost to actually connect individual homes to the sewer system. Those costs will vary on the configuration of the lot and the distance from the house to the main sewer line. Those costs are typically the costs of the homeowner and are estimated to be about $20/foot. The connections to an individual house would be provided by a private plumbing contractor. The next step to move the concept plan forward would be to begin the preliminary engineering and design work. Engineers would be hired to take this concept, go out in the field and start the process of data collection and defining the details of the concept. OWASA has estimated the preliminary engineering costs would be $376,350. That is a rough estimate based on what is known of the area so far. A completed preliminary engineering and design will be necessary to complete a Community Development Block Grant application. Sewer Recommendations: The Task Force has discussed all or part of the proposed $5.8 million dollar sewer concept plan, but has not yet recommended moving forward with this concept plan, pending an agreement on a cost sharing plan for sewer improvements.