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3612_Duke_Allen_CompactModReq_DIN26763_20160926526 South Church Street: Mail Code EC13K Charlotte, North Carolina 28202 704-382-4761 September 19, 2016 North Carolina Department of Environmental Quality Division of Waste Management Solid Waste Section 2090 U.S. Highway 70 Swannanoa, North Carolina 28778 Attn: Mr. Larry Frost Re: Retired Ash Basin (RAB) Ash Landfill Compaction Modification Request Permit No.: 3612-INDUS Allen Steam Station Gaston County Belmont, North Carolina 28012 Dear Mr. Frost, As discussed via phone conversation on September 7, 2016, Duke Energy requests approval for modification to the intermediate cover compaction specification for exterior slopes at Allen Steam Station’s RAB Ash Landfill (Permit No. 3612-INDUS). The requested modifications are to revise the minimum compaction requirement for intermediate cover soil from 95 percent of Standard Proctor (ASTM D 698) maximum dry density to 90 percent and to revise the moisture content for intermediate cover soil from within 5 percent to within 3 percent of the material’s optimum moisture content; this requirement is found in Section 2.3 of the Operations Quality Assurance Plan located in the Operations Plan – Revision 7, Duke Energy Carolinas, LLC – Allen Steam Station, Retired Ash Basin (RAB) Ash Landfill – Phase 1, Permit No. 3612, Gaston County, Belmont, North Carolina. The requested modifications to this section are shown below by an underline. 2.3 QA Field Testing QA field testing shall be performed to monitor the compaction and moisture conditioning during waste placement. Waste shall be compacted to a minimum 95 percent of its Standard Proctor (ASTM D 698) maximum dry density, and intermediate cover soil shall be compacted to a minimum 90 percent of its Standard Proctor (ASTM D 698) maximum dry density. Compacted moisture content of waste shall be within 5 percent of the material’s optimum moisture content, and compacted moisture content of intermediate cover soil shall be within 3 percent of optimum moisture content as determined by ASTM D 698. Duke Energy proposes to revise this section of the Operations Plan to include the above requested modifications during the next Permit amendment or modification. If there are any questions regarding this request, please contact me at (704) 382-4761. Respectfully Submitted, Sean DeNeale Environmental Services Cc (via e-mail): Ed Mussler, NCDEQ Kyle Baucom, Duke Energy Scott Harris, Duke Energy