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H HAZEN SAWYER, P.C. <br /> CONSULTING ENGINEERS <br /> December 30, 1988 <br /> • <br /> Mr. John M. Link, Jr. <br /> County Manager <br /> County of Orange <br /> P.O. Box 8181 <br /> Hillsborough, NC 27278 <br /> Re: Additional Comments on Development <br /> of a New Reservoir in Northern <br /> Orange County <br /> Dear Mr. Link: <br /> We are pleased to present this letter report in fulfillment of our <br /> agreement with the County, dated November 29, 1988, for providing professional <br /> engineering services related to the development of a new reservoir in Northern <br /> Orange County. In accordance with the agreement, this report presents updated <br /> property requirements and costs for potential reservoirs on Seven Mile Creek <br /> and on the Eno River above McGowan Creek. These updates are based upon new <br /> topographic maps that have been prepared by Piedmont Aerial Surveys under <br /> contract with the County. In the Phase T Water Supply Study and related <br /> studies, estimates of reservoir water surface elevations and associated <br /> property requirements were based upon one—inch to 2000—foot topographic maps <br /> with 10—foot contours. The new maps are plotted at a scale of one inch to 200 <br /> feet and have 5—foot contour intervals. They permit property and other <br /> requirements for reservoir construction.to be defined with much greater <br /> accuracy than was previously possible.. -•• • _ . - <br /> This study has focused on-defining property requirements for the <br /> following levels of safe yield development, which have been previously <br /> evaluated for the two 'referenced sites: • <br /> Previously <br /> Total Total. Estimated <br /> • 20—Year Required Water Surface- <br /> - Safe Yield Storage • Elevation <br /> (mgd) (mg) _ (ft msl) <br /> From Phase I Study <br /> Eno River above McGowan Creek 8 1750 . 572 <br /> Seven Mile Creek • 6 2100 581 <br /> Town of Hillsborough, <br /> Seven Mile Creek 8(7)* 4900 597 <br /> • <br /> *Hazen and Sawyer estimate <br /> 4300 GLENWOOD AVENUE • P.O.BOX 30428 • RALEIGH.NORTH CAROLINA 27622 • (919)782-8333 <br /> RALEIGH.NC DURHAM.NC - CHARLOTTE.NC - NEWPORT NEWS,VA • HOLLYWOOD.FL • NEW YORK,NY <br /> v-- <br />