Agenda - 01-24-2005-9a - Laserfiche WebLink

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each meet 3 15 DRAFT MEMORANDUM TO: David Stancil, ERCD Director FROM: Paul Thames, PE, County Engineer DATE: January 13, 2005 SUBJECT: Water and sewer utility extension costs to serve Twin Creeks property under Citizen Plan 3 scenario As per your request, I have re-estimated (original estimates by memoranda to you 11/1/2000 and 9/23/2004) the costs of providing water and sewer utilities to serve the school/Twin Creeks Park facilities as per the layout shown by the Detailed Site Plan: Citizens' Plan #3. 1 have included one small topo/property map (scale 1 "=600') to show potential sewer utility routings (shown as solid lines) across County owned property. I have also shown potential routings (shown as dashed lines) for sewer utility extensions that may be desired by OWASA to optimize OWASA's sewer collection system for areax beyond the school and park sites. I have not estimated costs for the extensions that may be desired by OWASA since, as they do not provide any enhancement of the County owned sites, should be provided - if at all - at OWASA's expense. It is also possible that OWASA might wish to have line sizes and carrying capacities increased for those portions of the sewer extensions that do serve the proposed school and park facilities so that wastewater flows from beyond the County sites can be accommodated. Additional costs incurred in this manner should also be born by OWASA and have not been included herein. As noted in my 9/23/04 memorandum, I estimate the cost of 8" gravity sewer lines (this is the minimum diameter allowable for public sewer extensions and is more than adequate to accommodate flows that would be generated by either or both a school or park) at between $100 and $125 per linear foot (as per recent information provided by OWASA) and 12 water line at $75 to $100 per linear foot. Per foot prices are inclusive of the costs of construction, design, project administration, some rock excavation, permitting fees, easement acquisition, etc. As noted in my 9/23/04 memorandum, OWASA requires that extension of water and sewer utilities extend all the way across the property being served by extension. This provides the opportunity for other property owners to obtain utility service by the extending the utilities onward across their properties and so on. The costs shown herein for utility extensions take into account that utilities are to be extended all the way