NC0004979_Portable Cooling Tower Request_20010509

I r
J
Duke
dr Power.
A Duke Energy Company
May 9, 2001
Mr. Mike Myers
North Carolina Department Environment and
Natural Resources
NPDES Unit
1618 Mail Service Center
Raleigh, NC 27699-1618
Duke Power
Group Environment, Health & Safety
MG03A5
13339 Halzers Ferry Road
SUBJECT: Portable Cooling Tower Request
Plant Allen NPDES Permit # NC0004979
Buck Steam Station NPDES Permit # NC0004774
Marshall Steam Station NPDES Permit # NC0004987
Record Number: NC -005157
Certified: 7000 1670 0003 3252 8363
Dear Mr. Myers:
NC 28078-7929
This letter is an addendum to the letter dated April 10, 2001, see attached. After site
visits by the cooling tower vendor engineers, the decision was made to pump the once -
through, non -contact cooling water (CCW) water to the cooling towers after it exits the
discharge pipe. Originally, the plan was designed to tap into the discharge line and
remove a portion -.of the CCW.
The effluent of the cooling tower will be returned downstream in the discharge canal so
as not to influence the intake to the cooling tower. The effluent will be monitored for
thermal and the data will be hard wired into the plant's database. This data will be
included with the flow -weighted calculations to determine the plant's thermal discharge.
If you need further clarification on this request, please contact John Mease at (704) 875-
5347. Thank you in advance for your prompt consideration.
Sincerely,
ki, -,,� m,�
Michael A. Ruhe, Manager
Water Compliance
cc,,.Mike Parker — NCDENR, Mooresville Regional Office
(L
_
c�
oN
=3 m
0
0= W
r
o�
SUBJECT: Portable Cooling Tower Request
Plant Allen NPDES Permit # NC0004979
Buck Steam Station NPDES Permit # NC0004774
Marshall Steam Station NPDES Permit # NC0004987
Record Number: NC -005157
Certified: 7000 1670 0003 3252 8363
Dear Mr. Myers:
NC 28078-7929
This letter is an addendum to the letter dated April 10, 2001, see attached. After site
visits by the cooling tower vendor engineers, the decision was made to pump the once -
through, non -contact cooling water (CCW) water to the cooling towers after it exits the
discharge pipe. Originally, the plan was designed to tap into the discharge line and
remove a portion -.of the CCW.
The effluent of the cooling tower will be returned downstream in the discharge canal so
as not to influence the intake to the cooling tower. The effluent will be monitored for
thermal and the data will be hard wired into the plant's database. This data will be
included with the flow -weighted calculations to determine the plant's thermal discharge.
If you need further clarification on this request, please contact John Mease at (704) 875-
5347. Thank you in advance for your prompt consideration.
Sincerely,
ki, -,,� m,�
Michael A. Ruhe, Manager
Water Compliance
cc,,.Mike Parker — NCDENR, Mooresville Regional Office

PDrPower_
Duke
A Duke Fx p Company
April 10, 2001
Mr. Mike Myers
North Carolina Department Environment and
Natural Resources
NPDES Unit
1618 Mail Service Center
Raleigh, NC 27699-1618
SUBJECT: Portable Cooling Tower Request
,Plant Allen NPDES Permit # NC0004979
Buck Steam Station NPDES Permit # NC0004774
Marshall Steam Station NPDES Permit # NC0004987
Record Number: NC -005157 -
Certified: 7000 1670.0003 3252 8387
Dear Mr. Myers:
Duke Power
Group Environment, Health d Safety
MG03A5
13339 Hagers Ferry Road
Huntersville, NC 28078-7929
Duke Power requests the approval of a pilot study using portable cooling towers to
provide additional cooling to the once -through, non -contact cooling water (CCW) at three
of our stations. The three stations are Plant Allen, Buck Steam Station and Marshall
Steam Station. The cooling towers will be used during the months of June, July, August
and September. The cooling towers for Plant Allen may be rotated to Marshall Steam
Station, with Plant Allen using the towers during June, July and August. If the towers are
moved to Marshall Steam Station, this move would occur at the end of August and be
used there for September each year. Duke Power requests the pilot study to begin on
June 1, 2001 and last through October 31, 2002.
When, the portable cooling towers are in full operation, a portion.(<15%) of the CCW
water will be removed from the discharge pipe and cooled before it reaches the
compliance monitoring point. There are currently no plans to use chemicals or have a
K blowdown discharge.
It is also requested to move the thermal compliance point for Plant Allen 75 yards down
stream in the discharge canal to account for the return line.
John Mease and Ty Zieglerof Duke Powermet with. Mike Parker of NCDENR,
Mooresville Regional Office, on Apri1:9,.2001 to discuss'the proposed Pilot Study... Me.
Parker was unaware.of any potential water compliance issues or adverse environmental
impacts associated with this.project. A vendor.; brochure with additional information o'
the portable; cooling towers was left with. Mr Parker, see attached.

Near term -forecast predictions indicate a continuation of abnormally dry conditions with
below normal rainfall. Duke Power requests approval of this Pilot Study by April 24,
2001, to assure adequate electrical supply, while maintaining thermal limits, and
protecting the environment.
If you need further clarification on -this request, please contact John:M0-W at -(704) 875- -
5347. Thank you in advance for your prompt consideration.
Sincerely,
Michael A. Ruhe, Manager
Water Compliance
cc: Mike Parker — NCDENR, Mooresville Regional Office ;
I

N ``
I. � t}