NC0084387_Staff Comments_19930120

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DIVISION OF ENVIRONMENTAL MANAGEMENT
January 20, 1993
MEMORANDUM
TO: Monica Swihart
TRHU: Ruth Swanek l-C$
Carla Sandersontlk
FROM: Jacquelyn M. Nowe114
SUBJECT: Proposed CMUD-North Mecklenburg Water Treatment Plant
Project # 93-0558
Mecklenburg County
The Technical Support Branch has reviewed the scoping letter for environmen-
tal assessment for the proposed project. Our primary comment is that the mini-
mum continuous (or instantaneous) release of 50 cfs from the Lookout Shoals Dam
be maintained downstream of the proposed water withdrawal. The North Mecklen-
burg WTP has an initial proposed withdrawal of 18 MGD (27.9 cfs) and a potential
future withdrawal of 108 MGD (167.4 cfs). Existing and proposed dischargers in
Lake Norman below the withdrawal will be given effluent limitations based on the
minimum instantaneous release and the proposed WTP should not effect this flow.
Please contact me if there are any additional questions.
cc: WLA File

Department of Environment, Health, and Natural Resources
❑ Project located in 7ih floor library
Division of Planning and Assessment
Project Review Form
Project Number: County: Date: / Date Response Due (firm deadline):
This project is being reviewed as Indicated below:
Regional Office/Phone
Regional Office Area
In -House Review
El Asheville
R/O Areas
El Soil and Water El Marine Fisheries
El Fayetteville
�❑,l(All
J Air
❑Coastal Management Water Planning
Water
❑ Water Resources Environmental Health
Mooresville
,/Groundwater
Kt
Wildlife ❑Solid Waste Management
❑ Raleigh
Land Quality Engineer
❑Forest Resources ❑Radiation Protection
❑ Washington
❑ Recreational Consultant
❑ Land Resources ❑ David Foster
❑ Wilmington
El Coastal Management Consultant ,
}Parks and Recreation ❑Other (specify)
El Winston-Salem
100thers .,
Environmental Management
JAN 6 199`.
M anager Sign-Off/Region:
Dale:
In -House Reviewer/Agency:
Response (check all applicable)
Regional Office response to be compiled and completed by Regional Manager
❑ No objection to project as proposed
❑ No Comment
❑ Insufficient infornatlon to complete review
❑ Approve
❑ Permit(s) needed (permit files have been checked)
❑ Recommended for further development with recommendations for
strengthening (comments attached)
❑ Recommended for further development if specific & substantive
changes Incorporated by funding agency (comments
attached/authority(ies) cited)
In -House Reviewer complete individual response.
❑ Not recommended for further development for reasons
slated in attached comments (authority(les) cited)
❑Applicant has been contacted
❑Applicant has not been contacted
❑ Project Controversial (comments attached)
❑ Consistency Statement needed (comments attached)
❑ Consistency Statement not needed
❑ Full EIS must be required under the provisions o1
NEPA and SEPA
❑ Other (specify and attach comments)
RETURN TO:
Melba McGee
Division of Planning and Assessment by Due Date shown.

0
BLACK & VEATCH
8604 CIJI Ccmeron Su;te 164, Chcrlctte, North Carobnc 28269, 704) 5-18-6- =' Fax [phone]
Charlotte -Mecklenburg Utility Department
North Mecklenburg WTP
Ms. Chrys Baggett
North Carolina State Clearinghouse
Department of Administration
116 West Jones Street, Fifth Floor
Raleigh, North Carolina 27603-8003
Dear Ms. Baggett:
B&V Project 19729.119
B&V File F
December 22, 1992
Subject: Scoping Letter for
Environmental Assessment
The Charlotte -Mecklenburg Utility Department (CMUD) plans to construct a
new water treatment plant in northern Mecklenburg County. On October
27, 1992, representatives of Black & Veatch met with Ms. Linda Sewall of
the Division of Environmental Health to discuss the project. She
recommended that this scoping letter be submitted to present a
description of the project to assist local, state, and federal
regulators in the environmental review of the project.
This letter provides introductory and background information about the
project in order to obtain comments from concerned agencies. An
environmental assessment will be prepared and submitted to the North
Carolina Division of Environmental Health to address the comments and
regulatory requirements of the various agencies.
The North Mecklenburg water treatment plant will be located on a 151-
acre site situated at the end of Babe Stillwell Farm Road, southeast of
N.C. Highway 73, near Lake Norman. The plant will withdraw raw water
from Lake Norman for processing and final distribution to the CMUD
distribution system. The plant will be sized for 18 million gallons per
day (mgd), with ultimate expansion to 108 mgd. The proposed project
will include a raw water intake on Lake Norman, treatment facilities,
treated water storage, high service pumping facilities, and raw and
finished water transmission pipelines.
The enclosed map shows possible intake locations and raw water
transmission pipeline alignment, and the treatment plant site.
Preliminary engineering studies are now underway to evaluate alternative

Ms. Chris Baggett
NC State Clearinghouse
Page 2
B&V Project 19729.119
December 22, 1992
raw water intake locations and intake designs. Following the raw water
study, a treatment plant study will be conducted to evaluate process
alternatives and develop a preliminary plant design and layout. This
will include the finished water transmission pipeline alignment and
treatment plant siting.
CMUD presently owns and operates a raw water intake on Lake Norman for
the 1 mgd Davidson Water Treatment Plant, which will be abandoned when
the new plant is put into operation. CMUD also owns a raw water intake
on Lake Norman that was previously used for the abandoned Huntersville
Water Treatment Plant. The location of these two intakes is shown on
the attached map. The existing intakes, as well as several possible new
intake locations, will be evaluated in terms of water depth and quality,
environmental concerns, public relations issues, and capital and
operating costs.
Comments on the proposed project are welcomed. We appreciate your .•
assistance in this matter and look forward to working with you during
the course of the project.
Very truly yours,
BLACK & VEATCH
Gary R. Talmage
CMUD3W/svl
Enclosure
cc: Linda Sewall
Tom Vandeventer
Mike Horsley
Barbara Schauer
Liz Urquhart

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