20080868 Ver 2_DEMLR Approval of Breach of Dike for R-9_20160304

Scarbraugh, Antho
From: Denton, Bill
Sent: Friday, March 04, 2016 4:46 PM
To: [e-mail]
Cc: Dumpor, Samir; Scarbraugh, Anthony
Subject: PCS Phosphate R-9 Dike Approval to Construct - Addendum No. 2
Attachments: BEAUF-_20160304_COAC Addendum-2_PCS R-9.pdf
Mr. Furness:
Please find the attached approval as discussed with you by telephone earlier. Feel free to contact me if you have any
questions or I may be of further assistance. Have a good weekend. RECEIVED/NCDENRIDWR
01
William H. Denton, IV, PE
Assistant Dam Safety Engineer
Division of Energy, Mineral, and Land Resources — Land Quality Section
Department of Environmental Quality
919 707 9220 office
[e-mail]
1612 Mail Service Center
Raleigh, North Carolina 27699
r.� Nothing Compares.
w
Email correspondence to and from this address is subject to the
North Carolina Public Records Law and may be disclosed to third parties.
MAR 4 2016
Water Quality Regional
Operations Section
Washington Regional Office

Energy, Mineral
and Land Resources
ENVIRONMENTAL QUALITY
Certificate of Approval
March 4, 2016
Potash Corp
Attn: Mr. Jeffrey C. Furness
1530 NC Hwy 306 South
Aurora, North Carolina 27806
RE: Approval to Construct — Addendum No. 2
Original Approval to Construct issued October 31, 2011
PCS Phosphate R-9 Dike
Beaufort County
Dear Mr. Furness:
PAT MCCRORY
Governor
DONALD R. VAN DER VAART
Sacrerary
TRACY DAVIS
Otrec(nr
RECEIVED/NCDENR/DWR
MAR 4 2016
Water Quality Regional
Operations Section
Washington Regional Office
This is in response to your submission dated February 11, 2016, and received on February 12,
2016, of engineering data and analysis for use of alternative embankment fill for construction of
a portion of the subject dam. The submitted information describes materials testing and stability
analyses to support use of shell bed material as embankment fill for the second pass between
Stations 107+00 and 150+00 of the embankment currently under construction. The analyses
demonstrate that the shell bed material may be used as suitable structural fill when placed in the
manner described in the geotechnical report prepared by Mr. Brian E. Ladd, PE.
This letter constitutes approval of the proposed design changes described in the submittal
received on February 12, 2016, subject to all stipulations of the Certificate of Approval dated
October 31, 2011, and the additional following stipulations:
After placement of the shell bed material in the embankment, regular density testing of the
material shall be performed at the frequencies specified and using the appropriate
measuring techniques identified in the approved Technical Specification. These tests shall
show that the material exhibits a dry density of 100 pounds per cubic foot or greater.
Documentation of the successful tests shall be submitted with record drawing submittal at
completion of construction (reference Stipulation No. 3 of Certificate of Approval dated
October 31, 2011).
2. Regular visual inspections of the shell bed section of the dike and documentation of its
performance shall be conducted by qualified personnel to insure maintenance needs are
identified and maintenance activities performed as necessary to insure safe operation.
Documentation associated with these inspections shall be submitted with record drawing
submittal at completion of construction (reference Stipulation No. 3 of Certificate of
Approval dated October 31, 2011).
Stale of North Carolina I Environmental Quality l Energy, Mineral, and land Resoa
1612 Mail Service Cent" I Raleigh, North Carolina 27699
919 707 9220 T

Mr. Jeffrey C. Furness PCS Phosphate R-9 Dike
Approval to Construct — Addendum No. 2 Beaufort County
March 4, 2016
Page 2 of 2
For further assistance, you may contact Mr. Samir Dumpor, PE, in the Washington Regional
Office at telephone number [phone] or a member of the Dam Safety Program staff in the
Raleigh Central Office at telephone number [phone].
E. pavis, PE, CPM
TED/whd
cc: Mr. Brian E. Ladd, PE
Mr. Robert M. Chiles, Jr., PE
ec: Mr. Samir Dumpor, PE, LQS Regional Supervisor - WaRO
Mr. Anthony Scarbraugh, Division of Water Resources - WaRO
Filename: BEAUF- 20160304 COAC Addendum-2 PCS R-9
State of Noah Carolina ! Environmental Quality I Energy. Mineral, and Land Resources
1612 Mad Service Center I Raleigh, North Carolina 27699
919 707 9220 T