HomeMy WebLinkAboutNC0004961_Permit Application Amendment_20160504�•y DUKE
ENERGY,
May 2, 2016
Mr. Jefferey Poupart
Division of Environmental Quality
Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1611
Subject: Permit Application Amendment
Riverbend Station
NPDES Permit NC0004961
Gaston County
Dear Mr. Poupart:
RECEIVEDINCDEUDWR
MAY 0 4 2016
Water Quality
Permitting Section
Harry K. Sideris
Senior Vice President
Environmental, Health & Safety
523 South Church Street
Mail Code: ECUP
Charlotte, NC 28202
704-382-4303
Duke Energy, LLC submitted an NPDES permit application for the Riverbend Station on May 15, 2014. In order to meet the
anticipated NPDES permit requirements associated with the discharge of interstitial water from site ash basins, the existing
wastewater treatment process will be supplemented to include temporary and mobile treatment units. The purpose of this
letter is to amend the NPDES permit application to reflect this process and to provide a courtesy notification of these planned
temporary changes.
Duke Energy hereby amends the NPDES permit application to reflect the changes at the plant.
As described in Riverbend's current NPDES Permit, the existing wastewater treatment system for waste flows from Riverbend's
former coal generating facility consists of sedimentation and neutralization processes provided by the two site ash ponds. The
wastewater treatment system will be temporarily supplemented to include the following treatment:
• Caustic, acid, coagulant, and polymer additive feed systems
• Primary and Secondary Clarification
• Metals scavenger system
• Pressure granular media filters
• Biological selenium removal
• Polishing filters
The treated effluent from the expanded wastewater treatment system will be routed along the similar path for final discharge
to Mountain Island Lake. Any low volume wastes (such as reject streams, backwash processes, or liquid residuals) resulting
from this additional treatment will be recycled to various points within the wastewater treatment system (temporary treatment
units and/or the ash ponds). The vendor selected to provide these temporary units will be providing additional operational
support staff for the treatment equipment.
If there are any questions or concerns please contact Brad Loveland @704-609-5637.
Sincerel ,
I
Harry Sideris
Senior Vice President Environmental, Health and Safety
Enclosure:
cc: Andrew Pitner, NCDEQ Water Quality (Mooresville Regional Office)
Steve Reid, NCDEQ Operator Certification Program
Bob Drum, Demo Regional Mgr. - West
Rick Massey, Station Environmental
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