Agenda - 03-26-2009 - 3b1 - Laserfiche WebLink

Browse Search

Preliminary Rogers Road Sewer Concepts June 22, 2007 Page 2 Concepts A and B are identical, except for the manner in which gravity service is provided to the several parcels immediately west of the Neville Tract. Concept A, which directs gravity flow northward to the new sewer line that will serve the Orange Regional Landfill, would be approximately 10 percent more expensive than Concept B, but would likely offer gravity service to a greater number of future lots. Concept B represents a slightly less expensive configuration, but may not offer sufficient flexibility if the two properties immediately west of the Neville Tract are subdivided for further development. These preliminary conclusions still need to be confirmed by engineering analyses and field surveys. Concept C offers sewer service to the 10 existing lots within the study area that could not be served by either Concept A or B. Concept C would also provide service to approximately 20 additional lots in the Billabong Lane vicinity, which is outside of the delineated Rogers Road study area. A combination of either Concept A or B, plus Concept C, would therefore be needed to serve all existing properties within the study area, except for the single lot in the northwest corner of the study area, which cannot be served by gravity sewer under any of the three configurations. Preliminary Cost Estimates Project Costs — The table on the next page summarizes the preliminary estimated cost components of each concept plan. These were derived through the same methods used to estimate OWASA's own capital project costs. Further details are available on request. The following important caveats should be observed as these estimates inform the Roger Road Small Area planning process: • If the Town or others decide to pursue these sewer system concepts, additional engineering and professional services will be needed to provide site -level detail and overall determinations of engineering feasibility. • Construction cost estimates reported below are only preliminary and are not based on any assessment of field conditions. Cost estimates typically become more precise as detailed engineering design proceeds. • Estimates are based on the best information available as of June 2007. OWASA assumes that project costs will escalate at a rate of 8 percent perms. We recommend that this inflation factor be used in any future interpretation of these estimates. • The overall extent of these concept plans and the number of unserved parcels will change in the future if (or as) individual development projects extend new lines to currently unsewered properties.