6512_Duke_Sutton_Cell3SubgradeCertification_DIN27184_20161221

1300 Mint Street, Suite 300 Charlotte, North Carolina 28203 PH 704.227.0840 www.geosyntec.com
GC6198/Subgrade Certification - Cell 3

20 December 2016
Mr. Stephen Williams
Duke Energy Corporation 801 Sutton Steam Plant Road Wilmington, NC 28401
Subject: Subgrade Certification Letter Sutton CCR Landfill - Cell 3 Wilmington, North Carolina
Dear Mr. Williams:
Geosyntec Consultants of North Carolina, P.C. (Geosyntec) prepared this letter to comply with
Condition No. 9 found in Attachment 2 of the Permit to Construct No. 6512-INDUS-2016 for the
Sutton CCR Landfill located in Wilmington, North Carolina.
Condition No. 9 states, “A licensed geologist must report any pertinent geological feature(s)
exposed during phase or cell excavation. Prior to placing any landfill liner, the geologist must
submit to the Section Hydrogeologist a written report that includes an accurate description of
the exposed geological feature(s) and effect of the geological feature(s) on the design,
construction, and operation of the cell, phase, or unit.”
OVERVIEW OF CONSTRUCTION OBSERVATION
The excavation work was performed by Glover Construction (Glover) starting on October 2016
and was substantially completed on November 2016. Mr. John Carruth of Geosyntec served as
the designated representative and was on site to observe the construction activities under the
direction of the undersigned.
CERTIFICATION
Surficial sands and the Cretaceous Peedee Formation underlie the North Pond and are very
similar in nature. There are no significant confining units between the two formational units in
this area. Fill material was excavated from the North Pond to bring the Cell 3 area up in
elevation from between seven and nine feet; no excavation occurred in the Cell 3 area.
Mr. Stephen Williams
20 December 2016 Page 2
GC6198/Subgrade Certification - Cell 3
As expected, the soils excavated in the North Pond to obtain structural fill for placement in Cell
3 corresponded to a light brown to tan, fine to medium sand. The observed geological features
will not have any adverse effect on the design, construction, and operation of Cell 3.
If you have any questions or require additional information, please do not hesitate to contact the
undersigned.
Sincerely,

Beau Hodge, P.G.
Principal Geologist
NC License No. 1243

C. Fabian Benavente, P.E.
Senior Engineer