1812_Duke_Marshall_CompactReq_DIN26746_20160921

526 South Church Street:
Mail Code EC13K
Charlotte, North Carolina 28202
980-373-5697

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: Industrial Landfill No.1 Compaction Modification Request
Permit No.: 1812-INDUS
Marshall Steam Station
Catawba County
Terrell, North Carolina 28682

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 Marshall Steam
Station’s Industrial Landfill No. 1 (Permit No. 1812-INDUS). The requested modification is to revise the
minimum compaction requirement from 95 percent of Standard Proctor (ASTM D 698) maximum dry
density to 90 percent; this requirement is found in Section 2.4 of the Operations Quality Assurance Plan
located in the Operations Plan – Revision 5, Duke Energy Carolinas, LLC – Marshall Steam Station,
Industrial Landfill No. 1 – Phase 1, Permit No. 1812, Catawba County, Terrell, North Carolina. The
requested modification is shown below by an underline. The current moisture content requirement
would not change.

2.4 QA Field Testing
QA field testing shall be performed to monitor the compaction and moisture conditioning during
waste placement. Waste and interim cover soil shall be compacted to a minimum 95 percent of its
Standard Proctor (ASTM D 698) maximum dry density, and interim 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
within 3 percent for interim cover soil as determined by ASTM D 698.

Duke Energy proposes to revise this section of the Operations Plan to include the above requested
modification during the next Permit amendment or modification. If there are any questions regarding this
request, please contact me at [phone].

Respectfully Submitted,
Tyler Hardin
Environmental Services
Cc (via e-mail): Ed Mussler, NCDEQ
Kyle Baucom, Duke Energy
Dan Zakary, Duke Energy
Jeff Jones, Duke Energy