Agenda - 12-06-2012 - 3 - Laserfiche WebLink

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97 Preliminary Rogers Road Sewer Concepts June 22,2007 Page 2 Concepts A and B are identical,�cept 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 Ii.ne that will serve 13�e Orange Regional � Landfill,would be appro�cimately 10 percent more eapensive tha.n Concept B,but would l�cely offer gravity service to a greater num.ber of fut�re lots. Concept B represents a slightly less expensive configvration,but may not offer su�cient flexibility if the fwo � properties immediately west of the Neville Tract are subdivided for further developmen� These preliminary conclusions still need to be confirmed by engineering analyses and field surveys. Concept C offers sewer service to the 10 e�usting lots within the study azea 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 e�risting properties within the study azea,except for the single lot in the . northwest corner of the study azea,which cannot be served by gravity sewer under any of the three configurations. Preliminarv Cost Estimates Project Costs—The table on the ne�tt page summarizes the preliminary estimated cost components of each concept pla.n. These were derived through the same methocis used to estimate OWASA's own capital project costs. Further details are available on reques�t. 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 pwrsue these sewer system concepts, additional engineering and professional services will be need�d to pmvide site-level detail and overall determi.nations of engineering feasibility. � � • Construction cost estimates reported below are only preliminary and are not based on aay assessment of field conditions. Cost estimates typically become more precise as detailed engineering design proceeds. • Estimates aze based on the best information available as of June 2007. OWASA assumes that project costs will esca.late at a rate of 8 percent per vear. We recommend that this inflation factor be used in any fvture interpretation of these. estimates. � • The overall extent of these concept plans and the number of unserved parcels will change in the future if(or a.$)individual development projects extend new lines to currently unsewered properties.