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HomeMy WebLinkAboutNC0001422_LVSuttonSARP_Rev0_AppendixI_20161201Appendix I Post-Closure Care Plan POST-CLOSURE CARE PLAN L.V. SUTTON ENERGY COMPLEX SITE ANALYSIS AND REMOVAL PLAN December 2016 Revision 0 Prepared for Duke Energy Progress, LLC 526 South Church Street Charlotte, North Carolina 28202 Prepared by Geosyntec Consultants of NC, PC 1300 South Mint Street, Suite 300 Charlotte, North Carolina 28203 License No. C-3500 Geosyntec Consultants of North Carolina, PC Duke Energy Coal Combustion Residuals Management Program Appendix I – Post-Closure Care Plan Revision 0 December 2016 i TABLE OF CONTENTS 1 INTRODUCTION ............................................................................................................... 1 2 PROJECT DESCRIPTION ................................................................................................ 1 3 CLOSURE SCHEDULE .................................................................................................... 1 3.1 Introduction .............................................................................................................. 1 3.2 Closure Certification ................................................................................................. 1 3.3 Record Keeping ....................................................................................................... 1 4 CLOSURE SYSTEM DESIGN .......................................................................................... 2 4.1 Closure System Materials ........................................................................................ 2 4.1.1 Vegetation ................................................................................................... 2 4.1.2 Vegetative Layers ........................................................................................ 2 5 POST-CLOSURE ACTIVITIES ......................................................................................... 2 5.1 Contact ..................................................................................................................... 2 5.2 Post-Closure Maintenance ....................................................................................... 3 5.3 Inspection Plan ......................................................................................................... 3 5.4 Closure System Integrity .......................................................................................... 3 5.5 Monitoring Plan ........................................................................................................ 4 5.6 Post-Closure Land Use ............................................................................................ 4 5.7 Completion of Post-Closure Care ............................................................................. 4 6 FINANCIAL ASSURANCE ............................................................................................... 4 Geosyntec Consultants of North Carolina, PC Duke Energy Coal Combustion Residuals Management Program Appendix I – Post-Closure Care Plan Revision 0 December 2016 1 1 INTRODUCTION This Post-Closure Care Plan (Plan) is submitted as part of the Closure Plan Report for L.V. Sutton Energy Complex (Sutton), located in Wilmington, North Carolina. This plan has been prepared for Duke Energy Progress, LLC. (DEP) pursuant to CAMA Regulations §130A- 309.212(a)(4) k. 2 PROJECT DESCRIPTION The closure of Sutton consists of the total excavation of the coal combustion residuals (CCR) present in the 1971 and 1984 Basins and the Lay of Land Area (LOLA). The CCR will be placed in an on-site lined landfill. The 1971 Basin and LOLA will effectively become part of the Cooling Pond while the 1984 Basin will be graded to drain to the Cooling Pond. We note that this plan only deals with the excavation and later stabilization of the basins and LOLA; a post- closure care plan for the on-site landfill is being submitted under a separate report. 3 CLOSURE SCHEDULE 3.1 Introduction Following the completion of the CCR excavation and removal, the dikes at the 1971 Basin and LOLA will be breached in order to allow the Cooling Pond to expand into these basins. The western dike of the 1984 Basin will be removed and the rest of the dike of the 1984 Basin will be lowered to match the existing contours. The previously inside area of the 1984 Basin will be graded such that it drains to the Cooling Pond. The exposed areas will be vegetated. This post-closure plan is for the closure of 1971 and 1984 Basins and LOLA. 3.2 Closure Certification Following closure of each basin or portions of basins, the owner and operator shall notify the Division that a Certification, signed by the certifying engineer verifying that closure has been completed in accordance with the closure plan, has been placed in the operating record. This Certification will state that Sutton was closed in accordance with the Closure Plan and applicable regulations and laws. 3.3 Record Keeping Following final closure of the basins, the owner and operator shall record a notation on the facility property deed to this effect, or some other instrument that is normally examined during a title search, and notify the Division that the notation has been recorded and a copy has been placed in the operating record. The notation on the deed shall in perpetuity notify any potential purchaser of the property that the land had been used as a CCR disposal facility and its future use is restricted under the Closure Plan. Geosyntec Consultants of North Carolina, PC Duke Energy Coal Combustion Residuals Management Program Appendix I – Post-Closure Care Plan Revision 0 December 2016 2 4 CLOSURE SYSTEM DESIGN 4.1 Closure System Materials 4.1.1 Vegetation The surface of the closure system will be vegetated either by seeding or sodding. The grass seed will have a high tolerance to drought. The sod will be of firm texture, having a compacted growth and good root development. The minimum requirements of the grass seed and sod are presented in the Technical Specifications presented as part of the Closure Plan. 4.1.2 Vegetative Layers The upper 6 inches of the final cover system will consist of loosely placed vegetative layer and will be vegetated to minimize erosion. The minimum requirements of vegetative soil layer are presented in the Technical Specifications presented as part of the Closure Plan. 5 POST-CLOSURE ACTIVITIES Post-closure activities will be conducted at the facility in accordance with CAMA Regulations §130A-309.212(a)(4) k for a period of 30 years following final closure of the facility. The Division may decrease the length of the post-closure period if the owner or operator demonstrates that the reduced period is sufficient to protect human health and the environment, and the Division approves this demonstration. The period might be increased by the Division if the Division determines that the lengthened period is necessary to protect human health and the environment. The end of the post-closure period must be certified by a registered professional engineer. To accomplish certification over the required 30-year duration, a registered professional engineer will prepare annual certifications. The annual certifications will document that the closure system has been monitored and maintained in accordance with the Post-Closure Plan. The annual certifications shall be based on observations and results documented on regular post- closure monitoring reports, maintenance records, and compliance monitoring reports maintained in the Operating Record. 5.1 Contact The person responsible for the facility during the post-closure care period is: On-Site Environmental Professional Duke Energy Progress, LLC L.V. Sutton Energy Complex 801 Sutton Steam Road Wilmington, North Carolina (910) 341-4754 Geosyntec Consultants of North Carolina, PC Duke Energy Coal Combustion Residuals Management Program Appendix I – Post-Closure Care Plan Revision 0 December 2016 3 5.2 Post-Closure Maintenance Post-closure maintenance will be conducted at Sutton for a period of 30 years after final closure. Maintenance activities will be required for the closure system to remain functional. The vegetative cover shall be mowed as necessary. The vegetative cover shall be amended and fertilized as needed to maintain healthy vegetation. Depressions in the cover that pond water or otherwise impair the function of the cover will be filled and/or regraded. Areas subject to regrading will be revegetated. Animal burrows and eroded areas should be filled in with compacted soil and reseeded. If vegetative cover is not adequate in a particular area, fertilizer or other soil amendments should be applied and the area reseeded in order to re-establish vegetation. Insecticides may be used to eliminate insect populations that are detrimental to the vegetation. In addition to maintenance of the vegetative cover, any items noted as requiring maintenance in Section 5.3 Inspection Plan would also require maintenance. Maintenance will include mowing at least two times per year as well as needs identified through the monitoring program will be initiated no later than 60 days after the discovery or within 24 hours if a danger or imminent threat to human health or the environment is indicated. 5.3 Inspection Plan Routine inspections will be conducted throughout the post-closure care period and documented accordingly. These inspections will be carried out quarterly unless issues are detected that indicate that more frequent visits are required. Potential impacts to the public and environment will be considered in determining the inspection frequency. Items to be included in the quarterly inspection will be as follows: • Access and security control such as fences, gates, locks, and other measures that control site and facility access • Closure system for signs of erosion, settlement, or subsidence • Condition and/or presence of vegetation (for distressed or dying vegetation or woody vegetation with potential to penetrate the low permeability barrier) • Storm water management • Erosion and sediment control • Groundwater monitoring system • Integrity of site benchmarks • Vector control 5.4 Closure System Integrity DEP shall maintain the integrity and effectiveness of the closure system including repairing the cover as necessary to correct the effects of settlement, subsidence, erosion, or other events, and preventing run-on and run-off from eroding or otherwise damaging the closure system. Geosyntec Consultants of North Carolina, PC Duke Energy Coal Combustion Residuals Management Program Appendix I – Post-Closure Care Plan Revision 0 December 2016 4 5.5 Monitoring Plan Post-closure monitoring will be conducted at Sutton for a period of 30 years after final closure. Monitoring will include: (i) sampling of groundwater three times per year; and (ii) monthly inspection of the final closure systems for the first year and quarterly inspections thereafter. A monitoring plan which addresses groundwater monitoring has been prepared and is included in the Closure Report. Groundwater monitoring shall continue throughout the post-closure care period in accordance with the Plan. 5.6 Post-Closure Land Use The primary land use for Sutton after closure will be open dormant green space and open water. Post-closure use of the property shall not affect the integrity of the closure system, or the function of the monitoring systems. The Division may approve disturbance if the owner or operator demonstrated that disturbance of the closure system will not increase the potential threat to human health or the environment. 5.7 Completion of Post-Closure Care The Division shall be notified following certification of completion of the post-closure care period for the facility and that a certification signed by a registered professional engineer licensed in the state of North Carolina, verifying that post-closure care has been completed in accordance with the post-closure plan has been placed in the operating record. 6 FINANCIAL ASSURANCE In accordance with the North Carolina Solid Waste Management Rules (15A NCAC 13B.1628) and North Carolina Session Law S.L. 2011-262, financial assurance will be provided by DEP in the form of the Corporate Financial Test (40 C.F.R. §258.74(e)). Documentation as required by 40 C.F.R. §258.74(e)(2) shall be placed in the facility operating record before the initial receipt of waste. The Director will be notified when the documentation of financial assurance has been placed in the operating record. After the initial placement of documentation of financial assurance as required by 40 C.F.R. §258.74(e)(2) in the facility operating record, DEP will annually update the information and place updated information in the operating record within 90 days following the close of their fiscal year. The Director may provide up to an additional 45 days if DEP can demonstrate that 90 days is insufficient time to acquire audited financial statements.