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Home My WebLink AboutNC0003425_Correspondence_20180101ROY COOPER Governor MICHAEL S. REGAN Secretary LINDA CULPEPPER Interim Director NORTH CAROLINA Environmental Quality August 15, 2018 Mr. Paul Draovitch, Senior Vice President EH&S Duke Energy Carolinas, LLC 526 Church St. Mail Code: EC3XP Charlotte, NC 28202 Subject: Draft NPDES Permit Renewal Permit NC0003425 Roxboro Steam Electric Plant Person County Class II Facility — Sanitary WWTP Dear Mr. Draovitch: Enclosed with this letter is a copy of the Draft NPDES permit renewal for your facility. Please review this draft carefully to ensure thorough understanding of the requirements and conditions it contains. There are several changes from the draft permit transmitted on January 21, 2017 including the following: • The special condition addressing the discharge from seepage was eliminated. Seeps will be addresses through Special Order by Consent EMC SOC WQ S 18-005. • Outfall 001 discharge location and monitoring requirements were modified. This outfall is described as the discharge of the East Ash Basin Extension and stormwater runoff. The outfall location was established at the UT to Hyco Lake. The monitoring frequency during the removal of the ash from the east ash basin extension was modified to weekly. • The RPA for outfall 003 was revised using updated thallium criteria, as a result the limits for thallium were eliminated. • For clarification, the identification of outfall 003 was modified to heated water discharge pond. • Monitoring frequency for arsenic, selenium and mercury at outfall 003 was increased to weekly during dewatering. • The note for outfall 002 that contains the requirement to use physical -chemical treatment during decanting and dewatering was modified. The installation of physical/chemical treatment is not required unless necessary to meet the water quality standards. NORTHCAROUNAD_E Q�I Department of Environmental Duality North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 1 1611 Mail Service Center I Raleigh, North Carolina 27699-1611 919.707.9000 • The groundwater monitoring well construction and sampling condition was eliminated from the permit. • pH limits were eliminated from internal outfalls. • The flow page for 0.15 MGD for the domestic treatment system (outfall 008) was eliminated since the WWTP was upgraded to 0.25 MGD. • Monitoring for arsenic, mercury, antimony, copper, molybdenum and selenium were added to Outfall 012A due to the contribution from ash basin closure flows and treated groundwater. • Outfall 006 requirements were modified to reflect the nature of the discharge. This pond discharge is episodic, it only discharges if there is a heavy rain event, therefore limits were implemented as daily maximums. • Special Condition A. (28) Compliance Boundary was added to the permit. Groundwater compliance boundary maps were added to the permit as Attachments A and B. Attachment A describes the current compliance boundary and Attachment B describes the compliance boundary once the ash is removed from the East Ash Basin Extension. • Special condition for instream sampling was modified to require monthly sampling, to add sulfides to the list of monitored parameters and to specify a sampling location. • The Fish Tissue Monitoring Near Ash Pond special conditions was modified to clarify requirements. • The special condition for 316(b) requirements was modified to include a schedule to submit the information by May 31, 2022. Concurrent with this notification the Division is publishing a notice in a newspaper having circulation in the general Person County area, soliciting public comments on this draft permit. Please provide any written comments you may have to the following: NCDEQ/DWR, NPDES Permitting Branch, 1617 Mail Service Center, Raleigh, NC 27699-1617 no later than 30 days after receipt of this draft permit. Following the 30-day public comment period, the Division will review all pertinent comments and take appropriate action prior to issuing a final permit. If you have questions concerning this draft permit, please call me at (919) 807-6387or by email at Teresa.rodriguez@ncdenr.gov. Sincerely, Teresa Rodriguez, Engineer NPDES Complex Permitting Unit Hardcopy: NPDES Files Ecopy: US EPA Region 4 DWR/Wastewater Operator Certification/Maureen Kinney DWR/Aquatic Toxicology Branch/Susan Meadows DWR/Raleigh Regional Office /Water Quality NORTHCAROUNAD_��`E Q�� Department of Enalranmenial Quay North Carolina Department of Environmental Quality I Division of Water Resources 512 North Salisbury Street 11611 Mail Service Center I Raleigh, North Carolina 27699-1611 919.707.9000