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Home My WebLink AboutNC0004979_Special Order By Consent_20190510 fi, PO,1_ . ROY COOPER °� Governor % 1� r MICHAEL S.REGAN ��`. ..,'A illi '. , 44 Secretary °i""" ° LINDA CULPEPPER NORTH CAROLINA Director Environmental Quality May 10, 2019 Mr. Paul Draovitch, Senior Vice President EHS Duke Energy 526 S. Church Street Mail Code EC3XP Charlotte,NC 28202 Subject: SOC S 17-009—Extension of Coverage for Newly-Identified Seeps Duke Energy Carolinas, LLC Allen Steam Station&Rogers Energy Complex NPDES Permits NC0004979 &NC0005088 Gaston&Rutherford Counties Dear Mr. Draovitch: Paragraph 7 of the cited Special Order by Consent(SOC) contains provisions allowing for the extension of SOC coverage to newly-identified or newly-discovered, non-constructed seeps that were not included at the time of the original issuance of the SOC. Duke Energy has reported to the Division of Water Resources (the Division)the identification of three new non-constructed seeps discovered at the Allen Steam Station and the Rogers Energy Complex, and has requested SOC coverage be extended to those non-constructed seeps. Pursuant to the terms contained within paragraph 7 of SOC S17-009, SOC coverage is hereby extended to non-constructed seeps identified as S-12 at the Allen Steam Station and S-37 and S- 38 at the Rogers Energy Complex. Modified Attachment A pages have been prepared for those facilities and are included as attachments to this letter. The modified Attachment A pages should replace those included in the SOC at the time of its original issuance. Additional reference and SOC coverage is also extended to seep S-10 at the Allen Steam Station. This non-constructed seep is collected in a French drain system and its flow is conveyed to a collection box, from which its volume is pumped back into the ash basin. This seep was documented during the development of the SOC, but reference to the seep was not included due to the seepage being returned to the ash basin with no discharge to surface waters. Because seep S-12 will potentially exist only during temporary, infrequent episodes during power interruptions to the seep S-10 pumping apparatus,reference to seep S-10 within the SOC is appropriate. fD NorthNorth CaroSalisburylina DepartmentStreet1 of1617 EnMvironmentalailServiceCenter I Raleigh Quality I Division of WaterNorthCarolina Resou27rces Q 512 , 699-1617 NORTH CAROLTNA BaRroNnb Fmhamretid(aa4� 919.707.9000 Mr. Paul Draovitch S 17-009 SOC Coverage Extension p. 2 The extension of SOC coverage to these non-constructed seeps does not include any additional surface water monitoring requirements, nor have any new interim action levels been established for surface waters the seeps flow into. Each of the newly-identified seeps exhibited a low flow condition at the time of its discovery that precluded the collection of a suitable sample for a chemical characterization of the seep. Duke Energy is reminded that as a term of this extension of coverage, the newly-identified seeps are to be sampled for the presence of those characteristics listed in Attachment B of the SOC. Should any of the newly-identified seeps exhibit flow volume allowing for the collection of an adequate sample for the purposes of chemical analysis, such sampling and analysis must be performed, and their results reported to the Division. If you have any questions concerning this matter, please contact Bob Sledge at(919) 707-3602. Sincerely, ,,,,(1; =====--- Linda Culpepper f' r Attachments cc: Central Files NPDES Unit— SOC File ec: Mooresville Regional Office—DWR/Water Quality Regional Operations Asheville Regional Office—DWR/Water Quality Regional Operations Shannon Langley—Duke Energy Chris Hallman—Duke Energy Attachment A S17-009 Duke Energy Carolinas, LLC—Allen Steam Station Non-Constructed Seeps Approximate Location Receiving Seep ID Coordinates Description Receiving Waterbody Waterbody SOC Monitoring Interim Number Latitude Longitude Classification Requirements Action Level Seep located near northwest N/A—Flow is collected and pumped back to corner of Primary Pond 1.Seep NPDES-permitted S-10 35.18055 -81.01354 flow collected in a French drain wastewater system in N/A N/A N/A system and conveyed to a tank accordance with the from which seepage is pumped back into the ash basin. pumping system's • design capacity. Overflow discharge of seepage collected from 5-10 occurring during temporary,infrequent power outage episodes. Instream - S-12 35.18101 -81.01349 Seepage would flow to a Catawba River(Lake WS-V; B Monitoring of N/A stormwater drainage channel. Wylie) Lake Wylie 2B Standards Apply Seep flow is collected and pumped back into the ash basin during normal operations. *Location previously investigated as a seep. Monitoring has not indicated the presence of coal combustion residuals. **Seep dispositioned via repair and/or non-flowing condition to potentially reach WOTUS,or other,as noted. Monitoring shall be conducted at the approximate locations indicated on the attached site map. All monitoring shall be conducted per the requirements found in Attachment B of this Order. Attachment A S17-009 Duke Energy Carolinas, LLC—Rogers Energy Complex (Cliffside Steam Station), p.5 Approximate Location Receiving Seep ID Coordinates Description Receiving Waterbody SOC Monitoring Interim Number Latitude Longitude Waterbody Classification Requirements Action Level Minor diffuse groundwater seepage along bank of Suck Creek,west of the active ash Suck Creek N/A S-36 35.210258 -81.753983 basin dike. New area identified with no Suck Creek WS-IV Instream 2B Standards Apply current data. Area to be monitored to Monitoring determine status. Small seep emerging approximately 20 feet Suck Creek north of 5-36 and 25 feet east of Suck Creek N/A- S-37 35.210270 -81.753822 Suck Creek WS-IV Instream as shallow standing water. Flow was too low 2B Standards Apply Monitoring to obtain a sample for analysis. Small seep first observed 4/8/19 on the south bank of the Broad River,east of the Broad River S-38 35.218562 -81.753919 river's confluence with Suck Creek and west Broad River WS-IV Instream N/A- of constructed seep S-04. Flow was too low Monitoring 2B Standards Apply to obtain a sample for analysis. *Location previously investigated as a seep. Monitoring has not indicated the presence of coal combustion residuals. **Seep dispositioned via repair and/or non-flowing condition to potentially reach WOTUS,or other,as noted. Monitoring shall be conducted at the approximate locations indicated on the attached site map. All monitoring shall be conducted per the requirements found in Attachment B of this Order.