NC0003425_Correspondence_20190410

Strickland, Bev
From:
Shell, Karrie-Jo <[e-mail]>
Sent:
Wednesday, April 10, 2019 10:37 AM
To:
Chernikov, Sergei
Cc:
Staples, Bridget; Wahlstrom-Ramler, Meghan
Subject:
RE: [External] Roxboro 316(b) submittal
Follow Up Flag: Follow up
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My recommendation is that the fact sheet clearly discusses the evaporations rate, how the make-up is minimized, and
the impoundments possiabe nexus to waters of the US. Please iinclude calculations and data sources.
Karrie-Jo Robinson -Shell, P.E.
Environmental Engineer
US EPA Region 4
Water Protection Division
61 Forsyth Street
Atlanta, GA 30303
[phone]
From: Chernikov, Sergei <[e-mail]>
Sent: Wednesday, April 10, 2019 10:01 AM
To: Shell, Karrie-Jo <[e-mail]>
Cc: Staples, Bridget <[e-mail]>; Wahlstrom-Ramler, Meghan <[e-mail]>
Subject: RE: [External] Roxboro 316(b) submittal
Karrie-Jo,
I believe that the Roxboro situation is identical to the Belews situation and they meet the definition of the closed -cycle
recirculation system per 40 CFR 125.92 (c)(2).
Minimization of the withdrawal is accomplished by:
1) Cooling towers for Unit 4
2) Helper cooling towers for Unit 3 used seasonally
3) Use of deeper cooler water
4) Use of the station on the intermediate bases resulting in reduction of withdrawals from 800 MGD to 592 MGD
Thank you!
Sergei
Sergei Chernikov, Ph.D.
Environmental Engineer II
1

Complex NPDES Permitting Unit
NEW Tel. [phone]
1617 Mail Service Center, Raleigh, NC 27699-1617
Express Mail: 512 N. Salisbury St., Raleigh, NC 27604
From: Shell, Karrie-Jo[mailto:[e-mail]]
Sent: Tuesday, April 9, 2019 12:05 PM
To: Chernikov, Sergei <[e-mail]>
Cc: Staples, Bridget <[e-mail]>; Wahlstrom-Ramler, Meghan <[e-mail]>
Subject: RE: [External] Roxboro 316(b) submittal
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[e-mail]
Based on the schematic and info provided, only unit 4 can be considered a closed -cycle unit. The other units are not
closed -cycle.
Karrie-Jo Robinson -Shell, P.E.
Environmental Engineer
US EPA Region 4
Water Protection Division
61 Forsyth Street
Atlanta, GA 30303
[phone]
From: Chernikov, Sergei <[e-mail]>
Sent: Thursday, April 04, 2019 8:50 AM
To: Shell, Karrie-Jo <[e-mail]>
Subject: RE: [External] Roxboro 316(b) submittal
Karrie-Jo,
Please see my answers below:
Can they send a flow schematic/water balance that highlights the amount of makeup water withdrawn and do a
compared to what the withdrawal would be if the cooling system was once -through?
Please see the excerpt from Attachment 3 of the renewal application submitted for Roxboro (excerpt attached to this
email). It is believed this question is with regard to Unit 4 specifically. As such, as shown on the attached, Unit 4's
cooling tower requires approximately 17.3 MGD of makeup water per day when operating at full load (— 7 MGD
blowdown and —10.3 MGD evaporation). If the Unit was operated as once through cooling, the need for cooling water
would be similar to Unit 3. The Unit 3's withdrawal need is — 505 MGD per day when operating at full load.
Are there any endangered species? Has NC conferred with its Natural Resources Department regarding what impact, if
any, the CWIS might have on endangered or threatened habits near the intake?
There are no known endangered species in the vicinity of the Roxboro plant, or Hyco Lake, that would be subject to
entrainment or impingement.
Is there any intake flow limit in the permit to ensure that the facility maintains withdrawals reflecting a "non-baseload"
operating status?
There are no intake limits.

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Thank you!
Sergei
Sergei Chernikov, Ph.D.
Environmental Engineer II
Complex NPDES Permitting Unit
NEW Tel. [phone]
1617 Mail Service Center, Raleigh, NC 27699-1617
Express Mail: 512 N. Salisbury St., Raleigh, NC 27604
From: Shell, Karrie-Jo[mailto:[e-mail]]
Sent: Monday, April 1, 2019 1:04 PM
To: Chernikov, Sergei <[e-mail]>
Subject: RE: [External] Roxboro 316(b) submittal
External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
[e-mail]
Can they send a flow schematic/water balance that highlights the amount of makeup water withdrawn and do a
compared to what the withdrawal would be if the cooling system was once -through?
Are there any endangered species? Has NC conferred with its Natural Resources Department regarding what impact, if
any, the CWIS might have on endangered or threatened habits near the intake?
Is there any intake flow limit in the permit to ensure that the facility maintains withdrawals reflecting a "non-baseload"
operating status?
Karrie-Jo Robinson -Shell, P.E.
Environmental Engineer
US EPA Region 4
Water Protection Division
61 Forsyth Street
Atlanta, GA 30303
[phone]
From: Chernikov, Sergei <[e-mail]>
Sent: Monday, April 01, 2019 12:51 PM
To: Shell, Karrie-Jo <[e-mail]>
Subject: FW: [External] Roxboro 316(b) submittal
Karrie-Jo,

Attached please find a request from Duke to designate Roxboro Plant as Closed -Cycle Recirculating system. We believe
that this designation is warranted, the circumstances at Roxboro are similar to the Belews, which was previously
approved as closed -cycle by EPA.
Please let me know if you have any questions.
Thank you!
Sergei
Sergei Chernikov, Ph.D.
Environmental Engineer II
Complex NPDES Permitting Unit
NEW Tel. [phone]
1617 Mail Service Center, Raleigh, NC 27699-1617
Express Mail: 512 N. Salisbury St., Raleigh, NC 27604
From: Langley, Shannon [mailto:[e-mail]]
Sent: Friday, March 29, 2019 12:25 PM
To: Grzyb, Julie <[e-mail]>; Chernikov, Sergei <[e-mail]>
Cc: Poupart, Jeff <[e-mail]>; Baker Jr., Richard E <[e-mail]>
Subject: [External] Roxboro 316(b) submittal
External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
[e-mail]
Julie and Sergei,
Please see attached documentation and request related to the Roxboro Electric Generating Station. A hard copy has
been forwarded to you through the U.S. mail but I know you typically like to have electronic copies of submittals as well.
Thanks
5, sku,2 Z"yew
E. Shannon Langley I Duke Energy I EHS-CCP Environmental Programs
411 Fayetteville Street I Mail Code NC15 I Raleigh, NC 27601
Office:919.546.2439 1 Mobile: [phone] [e-mail]
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