Agenda - 06-06-2000-10 - Laserfiche WebLink

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zq MEMORANDUM TO: County Commissioners COPIES: John Link, County Manager Geaf Gledhill, County Attorney Craig Benedict, Planning Director Dianne Reid, Economic Development Directar FROM: Paul Thames, PE, County Engineer DATE: May 31, 2000 SUBJECT: Utility issues related to Hillsborough treatment capacities and Efland sewer system capacity and expansion I have recently been asked a number of water and sewer utility related questions by County Commissioners, particulazly in regazd to the ultimate capacity of the Efland sewer system and how it is affected by: a) the existing and projected sewer treatment capacity of the Town of Hillsborough; b) the contractual relationship between the County and Town for treatment of wastewater from Efland; and . c) the process by which decisions are or should be made in regard expanding or extending the sewer system. Commissioners have also inquired about the status of the 1997 Efland sewer bond-funded expansion of the system. The questions related to system capacity and system expansion policy may also become a component of the discussion about the approval of the extension of sewer service to a Habitat for Humanity affordable housing subdivision, Richmond Hills. The purpose of this memorandum is to address these questions and issues. I, Hillsborough Water/Wastewster Utility Treatment Demands and Capacity The Towri of Hillsborough's current water.use averages 1.6 mgd, but has been know to peak at as much as 2.4 mgd during the hottest and driest days of summer. Hillsborough's recently released "Water & Development Capacity Analysis FY 2000-2001" report projects that, over the next ten years, that the Town will be faced with an additiona1651,000 gallons per day (gpd) of residential water demand and 529,000 gpd of non-residential water demand from new projects. These water use forecasts are projected and extrapolated on the basis of assumptions about residential buildout on existing in-town lots and known projected residential and non-residential development. If the Town's assumptions about development are correct, the Town's total average daily water consumption by the yeaz 2010 will be approximately 2.8 mgd with a maximum or peak daily demand of approximately 4.1 mgd. The Town's existing water supply and treatment capacity, even with the Phase I portion of the new reservoir on line, aze not sufficient to meet a 4.1 mgd demand. The Town will have to expand its water treatment plant and construct the Phase II portion of the reservoir to meet the projected 4.1 mgd demand.