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16 <br />be considered, if the entire concept project is not feasible. The sewer infrastructure <br />routing was estimated based on the topography taken from maps rather than from any <br />field work. In order to get to a greater level of detail or certainty on the cost, some field <br />work would be required. There are two brown areas on the map that the County has <br />identified as some subsurface disposal or some suspected contamination. Without any <br />further investigation, the sewer line has been routed no closer than 100 feet of that <br />margin. <br />The total construction and installation cost for the concept level sewer is approximately <br />$5.8 million. See the table below. It would serve 86 additional parcels of land. The <br />concept costs include construction, engineering design, administrative and contingency <br />for possible rock. The topography of the neighborhood is complex and the land falls in <br />several different directions. This concept plan does not include the costs of any property <br />acquisitions or easement acquisitions. The availability hookup charge for each of the <br />parcels is based on an assumed average house size of 2,500 square feet. When a <br />customer connects to the OWASA water and sewer system, there is a one -time fee that <br />is estimated to be $4,300 for the concept plan. <br />