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HomeMy WebLinkAboutNCS000549_Email RE Outfall Description_20200409 McCoy, Suzanne From:Loveland, Brad P <Brad.Loveland@duke-energy.com> Sent:Thursday, April 9, 2020 8:25 AM To:Lucas, Annette Subject:\[External\] RE: Update Attachments:Riverbend Outfall Descriptions.docx CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to report.spam@nc.gov Hey Annette, See attached. This includes stormwater outfall descriptions at Riverbend including when demo was completed. Let me know if you need anything else. Brad Brad Loveland, CPESC, CEPSCI, CFM Duke Energy | Permitting and Compliance, Carolinas 526 South Church Street | EC13K | Charlotte, NC 28202 Office: 980 373 2820 Cell: 704 609 5637 From: Lucas, Annette <annette.lucas@ncdenr.gov> Sent: Thursday, April 2, 2020 11:56 AM To: Loveland, Brad P <Brad.Loveland@duke-energy.com> Subject: Update *** Exercise caution. This is an EXTERNAL email. DO NOT open attachments or click links from unknown senders or unexpected email. *** Brad – I may have an answer for you about the Riverbend rescission by Wednesday next week, I suggest you hold off on preparing the renewal application until then. Thanks, Annette Annette Lucas, PE Stormwater Program Supervisor Division of Energy, Mineral and Land Resources Department of Environmental Quality 919 707-3639 office annette.lucas@ncdenr.gov 1 deq.nc.gov/SW 512 N. Salisbury Street, Office 640-L, Raleigh, NC 27604 1612 Mail Service Center, Raleigh, NC 27699-1612 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Based on the current guidance to minimize the spread of COVID-19, the Department of Environmental Quality has adjusted operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts. To accommodate these staffing changes, all DEQ office locations are limiting public access to appointments only. Please check with the appropriate staff before visiting our offices, as we may be able to handle your requests by phone or email. We appreciate your patience as we continue to serve the public during this challenging time. 2 Riverbend Station currently has 7 total outfalls that are currently being sampled as part of Industrial Stormwater Permit. These are 2, 3, 4, 6, 10, 11 and 18 Riverbend station demo was completed in May 2018. Below is a description of the existing outfalls in Riverbend’s Industrial Stormwater Permit NCS000549. SW002 Discharge Structure 18" CMP Location Western bank of the intake canal Latitude - Longitude 35°21’38”N - 80°58’30”W Drainage Area 13.2 acres This drainage area includes runoff from the upgraded 44kV switchyard. The railroad embankment and rail are also included in this drainage area; however, all ash transport via train cars was ceased on March 2018. Large concrete barriers have been placed in the rail to prevent any railcar access. SW003 Discharge Structure 36” CMP Location Western bank of the intake canal Latitude - Longitude 35°21’40”N - 80°58’32”W Drainage Area 15.4 acres This drainage area includes the 230kV switchyard. This drainage area also includes rail runoff that previously was used to transport ash. All rail activity ceased in March 2018 and large concrete barriers have been placed on the rail to prevent any railcar access. SW004 Discharge Structure 18” RCP Location East of Horseshoe Bend Beach Road Latitude - Longitude 35°21’22”N - 80°58’32”W Drainage Area 4.6 acres This drainage basin is bound on the west by the access road parallel to the rail line and on the east by Horseshoe Bend Beach Road. This drainage area previously included haul roads entering onto Horseshoe Bend Beach Road used by trucks during ash transport. Ash Hauling activity ceased in December 2015. SW006 Discharge Structure 36” CMP Location Western bank of the intake canal Latitude - Longitude 35°21’39”N - 80°58’32”W Drainage Area 5.2 acres The drainage area previously included the combustion turbine area, the slopes of the containment dike for the former fuel oil bulk storage tank and the jet engine warehouse. These have all been removed and stabilized with grass. SW010 Discharge Structure 18” CMP Location North of W.F. Lark Maintenance Facility Latitude - Longitude 35°21’38”N - 80°58’41”W Drainage Area 0.6 acres The drainage area includes a wooded area north of the W.F. Lark Maintenance Facility; flow is then overland to Mountain Island Lake. This drainage basin includes approximately 8,000 square feet of roofed area and 7,000 square feet of paved storage area. SW011 Discharge Structure 18” CMP Location North of W.F. Lark Fossil Maintenance Facility Latitude - Longitude 35°21’33”N - 80°58’45”W Drainage Area 1.1 acres The drainage area includes runoff from the wooded area west of the W.F. Lark Maintenance Facility; flow is then overland to a creek leading to Mountain Island Lake. This drainage basin includes approximately 11,000 square feet of roofed area and 33,000 square feet of paved parking area. SW018 Discharge Structure 18” RCP Location East side of station intake canal Latitude – Longitude 35⁰24’41.9” N- 80⁰58’29.9”W Drainage Area: 8.8 Acres The majority of stormwater in this area is from the substation pad which is collected using a network of catch basins and storm drains and subsequently conveyed to a detention basin and then discharged through the outfall. The detention basin also receives sheet flow from a grassed area around the substation pad. The area where the substation pad is built previously contained the coal stock pile when the plant was under operation. The substation pad is covered with 6 inches of #57 stone and contains various electrical equipment including transformers, circuit breakers, and metering devices. The substation consists of a 100kV switchyard and a 44kV transformation yard is currently under construction. The transformers containing mineral oil will be in the 44kV yard. Drainage will be routed to an oil water separator prior to discharge into the detention basin.