West Cary Wastewater Treatment Plant Feasibility Study Meeting Summary

Meeting Summary

PiedmontOlsenHensley
A Geraghty & Miller Company

Project West Cary Wastewater Treatment Plant Summary Prepared By
Francine Durso

POH Project No. 39593.0000 Copy To
Attendees
Meeting Held With Division of Water Resources Robert Tucker
Kim Fisher
Date/Time March 4, 1997 Tim Bailey
Rob Bonne

Attendees Representing
John Morris DWR — Director
Tom Fransen DWR — Chief, Hydrology & Management Section
Tony Young DWR — Hydrology & Management Section
Sheila Ambat DWR — Hydrology & Management Section
John Maynard Piedmont Olsen Hensley (POH)
Morris Brookhart POH
Francine Durso POH

Items of Discussion

A. Background

Piedmont Olsen Hensley is beginning a feasibility study for the Town of Cary for a new wastewater
treatment plant to serve the western portion of Cary. The study will define capacity and location of
plant, location of discharge, and costs. Following the feasibility study, an enviromnental assessment
will be prepared.

B. Preliminary plant capacity

The service area for the proposed plant is roughly bounded by Highway 55, Highway 64, the Durham
County line and the Jordan Lake critical area. Preliminary estimates for ultimate permitted capacity of
the plant are in the range of 18 to 23 MGD.

Important: Should there be any corrections or additions to this summary, please notify Piedmont Olsen Hensley immediately.

2301 Rexwoods Drive
Suite 200
Raleigh, NC 27607-3366
Phone: [phone]
Fax: [phone]
dwr=497.doc

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Meeting Summary
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C. Preliminary plant locations

Based on the senrice area topography, the most likely location for the plant will be north of Highway
64 and west of SR 751, in the vicinity of White Oak Creek.

D. DWR genera! comments about water allocation, inter -basin transfer, and
minimum release from Jordan Dam

Under current regulations, up to 50 percent of Jordan Lake 's water supply pool can be diverted
outside the lake's watershed. The water supply pool volume is 45,800 acre-feet. A maximum of 50
percent, or 22,900 acre-feet can be diverted outside the watershed.

A discharge into Jordan Lake, the Haw River or any tributary to the Haw River, or the main stem of
the Cape Fear River would not be considered an inter -basin transfer. A discharge into a tributary of the
Cape Fear River would be considered an inter -basin transfer.

Minimum release from Jordan Dam is based on a minimum flow target of 600 cfs (+/- 50 cfs) at the
gage at Lillington. The release from the dam varies depending on the flow contribution from the Deep
River to total 600 cfs (+/- 50 cfs) at Lillington. There is also a requirement for 40 cfs minimum release
from the lake.

E. Potential discharge locations and DWR comments about each location

Sites 1 & 2: Jordan Lake via White Oak Creek & Jordan Lake via Beaver Creek
These sites are preferred as they would allow water to be returned to Jordan Lake which would help
maintain lake yield and reduce the volume of water discharged outside the Jake's watershed. DWR
realizes that water quality concerns about a discharge to the lake may be an overriding factor.

Sites 3, 4, 5, & 6: Haw River below Jordan Dam, Haw River at Old U.S. Highway 1 bridge, Cape
Fear River below CP&L coal-fired power plant, &Cape Fear River downstream of Buckhorn Dam

Any discharge location downstream of the dam and upstream of Lillington would have equal impact.
These locations would return water to the basin and would help offset the volume of water that must
be released from the dam to maintain the target flow at Lillington.

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Meeting Summary
(continued)

Other potential sites:

A discharge into the main stem of Jordan Lake (New Hope River arm) or into the Haw River at
Highway 64 would be preferred because either of these sites would be a discharge to the lake which
would help maintain yield.

None of the proposed discharge sites would be considered an inter -basin transfer.

F. Next Steps

POH will prepare and distribute a summary of meetings with DWQ, DWR an DEH) The Divisions
will likely have an internal meeting in late March. A joint meeting of the Divisions with the Town of
Cary may be scheduled in late March or early April to finalize discussion of these issues. A public
information meeting will likely be held in early May.

G. Other Issues

Inter-basin transfer will not be completely offset by the proposed project. Cary will still be returning
water to the Neuse Basin via the two existing wastewater treatment plants and there will be an increase
in consumptive use (water that is not returned to the system) as the basin continues to develop. The
volume of the inter -basin transfer would be reduced by the proposed project.

DWR has developed a water quantity model from Jordan Lake to Lillington; this model is being
revised and should be completed in about one year. The Corps of Engineers has a water quantity
model of Jordan Lake to Lock and Dam No. 1 on the Cape Fear River.

DWR is preparing documentation to the EMC with recommendations for allocation of Jordan Lake.
This document will be available the week of March 10.

Potential Discharge Location - West Cary WWTP