Agenda - 11-16-2004-9a - Laserfiche WebLink

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16 As indicated above, more than adequate sewer service can be provided to the park restroom/concession facility via an 8" diameter gravity sewer line which, at minimum slopes (0.40% by regulation) and flowing half frill, can accommodate a flow of approximately 225 gpm or 13,500 gallons per hour. In general, the regulatory calculation for park visitors is 5 gallons per day per visitor. An 8' line could accommodate approximately 2700 new visitors per hour. I estimate that connecting the restroom /concession facility to the nearest existing OWASA sewer line will require the construction of a sewer, extension of approximately 3400 feet (from existing sewer lines - shown in green on the attached map - in the Lake Hogan Farm subdivision) up Jones Creek all the way across the southern-most County owned parcel to at least the common east -west property line ( OWASA generally requires that utility extension projects extend all the way across parcels so that the next parcel owner can extend the utility in turn). An additional 600 feet of sewer line would be required to connect the restroom /concession facility to the outfall. This service line could be as small as 6" line. The total cost for the 8" and 6" line is estimated to fall in the $400,000 to $500,000 range. The projected costs associated with activating a 2000 feet section of OWASA's existing 16" transmission main along Old NC 86, and installing 2000 feet of 3" line into the park to the proposed restroom/concession facility is estimated to be approximately $50,000 to $75,000 depending on the need to install automatic flushing devices and /or onsite chlorination equipment to insure the availability of high quality water at that facility under all park use /water demand conditions. Total pricing estimates for larger sized water lines necessary to meet potable and fire flow water demands for schools sites have not been provided because water quality concerns make it is impractical to provide the upsized lines prior to the schools and /or other high demand uses being ready or nearly ready to come online. However, current day prices for 10" to 12" water mains are expected to fall in the $50 to $75 per foot range. At this time, it is not clear what the wastewater demands would be for the "water playground" shown to be located north of the existing pond on the draft master plan. Extension of sewer service to serve this area would probably require the extension of an additional 2500 feet of 8 "sewer line up Buckhorn Branch at a cost in the range of $250,000 to $312,500. Please note that these estimates are based in my review and understanding of the Twin Creeks draft master plan dated September 2, 2004. Changes in location of proposed facilities having a water and sewer utility demand; the addition of more facilities having a water and sewer demand; a decision to utilize OWASA potable water supplies for irrigation; or decisions to upsize water and sewer lines to accorn modate non -park water and sewer demands will have a profound effect on the projected costs cited herein. Costs cited are in today's dollars. The cost of utility construction has increased dramatically — far greater than inflation - related costs increases - in some instances of late. If I may provide additional clarification on this matter, please advise