Attach. 24, 2013-08-23 DeNeale to Russell email

From: Russell, Tim <Tim.Russell2@duke- energy. com>
Sent: Friday, August 23, 2013 2:21 PM
To: DeNeale, Sean <[e-mail]>; Bray, Mike
<Mi ke.B ray@ duke- energy. com>
Cc: Beaver, Dean R <[e-mail]>; Neill, Monte W
<Monte.Neill@duke- energy. com>; Wooten, Dale <Dale.Wooten@duke-
energy.com>, Stowe, Allen <Al I en. Stowe@, duke- energy. com>
Subject: RE: Buck dewatering
1 -foot per day is Duke's maximum rate to lower pool levels for stability purposes. TSS may dictate you lower the
level as a slower rate.
Tim Russell, P.E.
Geotechnical Leader
Central Engineering & Services
Duke Energy
[phone] - Office
[phone] - Mobile
From: DeNeale, Sean
Sent: Friday, August 23, 2013 2:18 PM
To: Russell, Tim; Bray, Mike
Cc: Beaver, Dean R; Neill, Monte W; Wooten, Dale; Stowe, Allen
Subject: RE: Buck dewatering
Mike, I'm not sure if you meant to say 1 foot per day...this seems like a very accelerated rate, as I've generally
heard we want to stick to around 1 foot per week.
Tim, what are your thoughts about the rate at which we can drop basin levels?
From: Bray, Mike
Sent: Friday, August 23, 2013 1:39 PM
To: Beaver, Dean R; Neill, Monte W
Cc: DeNeale, Sean; Wooten, Dale; Stowe, Allen
Subject: FW: Buck dewatering
Can we come up with a Plan dropping the #1 Ash Basin 1 foot per day. Talk to Opie, Shawn DeNeale and Allen
Stowe about doing this. We must get approval before we change anything. This was the way we did DR but a
couple of days we level in secondary pond was high so we waited.
Thanks Mike
From: Leap, Tom Y Jr
Sent: Friday, August 23, 2013 1:31 PM
To: Bray, Mike
Subject: FW: Buck dewatering
Duke -SEA -heck -00286947

From: Ziegler, Ty [mailto:[e-mail]]
Sent: Friday, August 23, 2013 1:15 PM
To: Leap, Tom Y Jr
Cc: Taylor, Henry
Subject: Buck dewatering
Tom,
I asked Henry yesterday about the communication process for requesting a partial dewatering of the Buck New
Primary Ash Basin. Henry suggested that I start with you.
We'd like to lower the water surface elevation in the New Primary basin by approximately 5 ft to facilitate
geotechnical and environmental drilling. We need to start soon as my understanding is the general drawdown
protocol is a maximum of approximately 1 ft per week. At this time, our recommendation would be to not
increase the pond level — once lowered, but understand that will be a separate decision.
At this time, we are not requesting drawdown of the Old Primary or Secondary cells.
I also assume that we will need to notify/coordinate with Sean DeNeale (environmental) and Allen Stowe
(NPDES compliance).
Who at the station do we need to work with?
Thanks for any guidance.
Ty
TY ZIEGLER, P.E. HDR Engineering, Inc.
Environmental & Regulatory Manager, Hydropower Services
440 S Church Street, Suite 1000 1 Charlotte, NC 28202
704.248.3654 1 c: 704.516.2703
[e-mail] I hdrinc.com
Duke -SEA -heck -00286948