NCG500225_Compliance Evaluation Inspection_20190726

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
NORTH CAROLINA
Environmental Quality
July 26, 2019
Charles Allen, Plant Maintenance Manager
Gaston Power Station
100 Oakwood Ave.
Roanoke Rapids, NC 27870
Subject: Compliance Evaluation Inspection
Gaston Power Station
NPDES Permit NCG500225
Halifax County
Dear Mr. Allen:
On Tuesday, July 23, 2019, Zach Thomas of the Raleigh Regional Office conducted a
compliance evaluation inspection of the facilities located at the Gaston Power Station. The
purpose of this inspection was to ensure compliance with the subject NPDES permit. During the
inspection, the presence and cooperation of all Dominion staff was helpful and appreciated.
The facility is located at the end of Jack Brown Road, North of Littleton, North Carolina.
This NPDES compliance evaluation inspection consisted of the following:
• Review of the NPDES permit;
• Review of the owner/facility information;
• Review of monitoring data and compliance history;
• On -site inspection of the sampling locations and Outfalls.
Findings during the inspection were as follows:
1. The Certificate of Coverage was renewed effective October 14, 2013 and will remain
valid for the duration of the General Permit (expires July 31, 2020).
2. The operator's log and supporting analytical documentation were consistent and up to
date. A review of records from approximately October 2016 — July 2019 revealed
compliance with permit monitoring requirements.
3. DMRs are not required per the General Permit.
4. The facility has two outfalls (Outfall 001 & Outfall 002):
a. Outfali 001 consists of hydroelectric operations cooling water, seepage, and oil
separator decant water. Temperature, pH, and an oil and grease sample are
collected from a "thieves hole" type pipe located at the dam.
b. Outfall 002 consists of hydroelectric facilities — once through cooling water. This
water is fed via gravity from the lake to cool bearing and is then returned back to
D ��� North Carolina Department of Environmental Quality I Division of Water Resources
Raleigh Regional Offlce - 3900 Barrett Drive Raleigh. North Carolina 27609
w I U NA^�'.•tl�""..""v'Zm� / 919.791,4200

the lake flowing through the draft tube. Temperature and pH are collected in the
tailrace at Warren's Landing Boat Ramp located approximately 2 miles
downstream of the dam.
The overall condition of the subject facility was compliant with the NPDES permit requirements
as observed on the day of the inspection. If you have questions or comments about the
inspection, this report or the requirements to take corrective action (if applicable), please contact:
Zach Thomas at 919-791-4247 or via email at zacharv.thomas'u ncdenr. ov
Sincerely,
4--'11
Rick Bolich, LG
Assistant Water Quality Regional Supervisor
Raleigh Regional Office
Attachments: EPA Water Compliance Inspection Report
Cc: Charles Allen (via email: [e-mail])
RROISWP Files
Central Files