NCG120101_Mayo Monofill Augmented COC with Issuance Letter_20140106

, A
NC®ENR
North Carolina Department of Environment and Natural Resources
Division of Energy, Mineral, and Land Resources
Land Quality Section
Tracy E. Davis, PE, CPM
Director
January 6; 2014
Pat McCrory, Governor
John E. Skvarla, III, Secretary
William J. 'Thacker
,Duke Energy Progress, Inc.
Mayo Steam Electric Plant
-10660 Boston Road
,Roxboro, NC,27574 "
Subject: General P'ei=mit'No. NCG120000 ,
Mayo Steam Plant hlonofill
COC NCG120101
Person County_`
Dear Mr. Thacker:
In accordance with your application for a discharge permit received on September
23, 2013, we are forwarding herewith the subject certificate of coverage to discharge under
the'subject state - NPDES general permit. This permit is issued pursuant to the
requirements of North Carolina General Statute 143-215.1 and the Memorandum of ,
Agreement between North Carolina and the US Environmental Protection Agency dated
October -15, 2007 (or as subsequently amended).
Please take notice that this certificate of coverage is not transferable except after
notice to the Division of Energy, Mineral, and Land Resources. The Division may require
modification or revocation and reissuance of the certificate of coverage (COC).
-.r Coverage under this General Permit is granted with the condition_ that the permittee
performs additional sampling`requirements as outlined in the amended-co,
mended conditions to the
COC. These include: _
(1) In addition to the parameters in NCG120000, sample each SDO semi-annually for
conductivity, pH, arsenic (As), selenium (Se),and boron (B). No benchmarks
apply; however, concentrations above the levels in Footnote 5 should be noted on
the Stormwater'Outfall Data Monitoring Reports (SDMRs) submitted to NC DENR.
r
(2)'Sampl'e each stormwater outfall' (SDO) once during the,frsUsampling event
between January 6 and June 30, 2014�.and once iIn the sampling event between
January 1 and June 30, 2017 (Year 5 - Period 1 in the `General Permit) .fbr=the
expanded list of parameters listed in' Table 1 as amended, on page 2 of1he COC.
1612 Mail Service Center, Raleigh, North Carolina 27699-1612,- Telephoft&919-707-9220 /'FAX- 919-733-2876
512 North Salisbury Street, Raleigh, North Carolina 27604 - Internet. htt .// ortal,ncdenr.orQ/web/Ir/land-Quality
An Equal Opportunity 1 Affirmative Action Employer — 50%Recycled 1`10% Post Consumer Paper

Mr. Nil. sa i J. Thacker
January 6, 2014
Page 2 of "
These additional parameters include metals and other constituents which may be
present in Zero Liquid Discharge (ZLD) wastewater used to condition the coal combustion
residue (CCR) transported to the monofill. These sample results will provide a baseline for
stormwater discharges when the monofill has just begun operation and a comparison after
three years of operation. The Division will consider the data upon renewal of coverage
under this General Permit.
The facility may request `Representative Outfall Status" for one or more outfalls at
the mono -fill so flhat fewer outff4f,; must be sampled. Please see Footnote 3 to Table 1 in the
amended COC. A form for an ROS Request can be found on our website at
http://12ortal.ncdenr.org-lweb/Jr/npdes-stormwater (on the "Miscellaneous Forms" tab).
We request that you provide copies of in -stream monitoring results per the
approved Water Quality Monitoring Plan (WQMP) required by the Solid Waste Permit
for this monofill site to the Raleigh Regional Office. Copies of these results should be sent
to the attention of Dave Parnell in the NC DEMLR Stormwater Permitting Program.
This permit does not affect the legal requirements to obtain other permits which
may be required by the Division of Energy, Mining, and Land Resources, or permits
required by the Division of Water Resources, Coastal Area Management Act, or any other
federal or local governmental permit that may be required. If the conditions as stipulated
in the COC are unacceptable to you, you may apply for an individual NPDES stormwater
permit.
If you have any questions concerning this permit, please contact Bradley Bennett at
telephone number [phone], or Bethany Georgoulias at telephone number (919)
807-6372.
Sincerely,
�SIF
for Tracy E. Davis, P.E., CPM
cc: Toby Vinson, DEMLR Land Quality Section
Dave Parnell, DEMLR Raleigh Regional Office
Autumn Romanski, DWR Raleigh Regip�al Office
�S e�-Ehermkov, DWR-Water 6aTity Permitting Section,
Stormwater Permitting Program Files
DWR Central Files

STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
GENERAL PERMIT NO, NCG120000
CERTIFICATE OF COVERAGE No. NCG1`2OM
S T ORNMATER DISCHARGES
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful
standards and regulations promulgated and`adopted by the North Carolina Environmental
Management Commission; and the Federal Water Pollution Control Act, and'the North
'Carolina Administrative Code in NCAC 15A-02fl .0114(b)(1), as amended,
Duke Energy Progress,, Inc.
_ F
is hereby authorized to discharge stormwater from a facility located at
Mayo Steam Electric Plant Monofili
10660 Boston Road
Roxboro
= Person County
to receivingwaters, designated as Bowes Branch, a class' C water in the Roanoke River
Basin, in.accordance with the effluent limitations, monitoring requirements, and other
conditions set forth in Parts I, II, III,,and IV of General Permit No. NCG120000 as attached,
and as'amended in pages 2-3 of this Certificate of Coverage.
Amended conditions
1. This Certificate of Coverage is an enforceable part ofthe permit.
2. In accordance with 15A.NCAC 02H .0114(b)(1), the monitoring program in Part II
Section B Table 1 Analytical Monitoring Requirements of this permit'is amended
as follows:

4, 1
Table 1 Analvtical Monitoring RPnnirPmPnt_v
, - q., Dischar
M ME W
"'_
�Vx—q�l
V� iU -,
'j�6rft6nV,,Freg'u_e"n­'
Measurement A�
AM c g,
V_- q- -'r . �51�
--trj -
M
�-_A t, ­n1w
MSamol - --,&,
R
'FX "_ 3. -
C.S';
�iJmfsN13- -
4t
V'-Chat
Chemical Oxygen Demand
m
semi-annual
Grab
SDO
Fecal Coliform —
# per 100. ml
semi-annual
Grab
SDO
Total Suspended Solids
mg/l
semi-annual
Grab
SDO
Arsenic (As)5
mg/ 1
semi-annual
Grab
SDO
Selenium (Se)S
i Ing/i
mg/l
semi-annual
sem-i--annual
semi -,annual.,
Grab
Grab
SDO
SDO
Boron (B)S
pHS
S.U.
Grab
SDO
-Conductivity
S
semi-annual'
SDO
Anfiffiony,(Sb), Total
mg/l
'SY0
Recoverable
Barium (Ba), Total
mg/l
Grab
SDO
Recoverable
Beryllium -(Be), Total
mg/l
Grab.-
SDO
Recoverable
Cadmium Total , (Cd)
­ -
ing/l
Grab
SDO
Recoverable
Cht-&-nitim,(U), Total
rrigill
Grab
SDO
Recoverable
Copper (Cu), Total
mg/l
Grab
SDO
Recoverable
Lead (Pb), -Total
mg/l
Grab
SDO
Recoverable
during Jan 6 -Jun 30; 2014;-
Mercury (Hg), TotalOnce
mg/l
Grab.
SDO
Recoverable
Once during Jan 1 -jun 30, 2017
-
molybdenum (Mo), Total
mg/l
Grab
SDO
Recoverable,
Nkke-l-�Ni)- Total
-
Recoverable
mg/l
Grab
SDO
5ilven(Ai), Total
mg/1
Grab
SDO,
Recoverable
Thallium (TI), Total
mg/l
Grab
SDO
-, -
I
-Recoverable _"
;Zinc (Zn), Total
t
mg/l
Grab
SDO
,Recoverable
Total Chloride (Cl) i
m
Grab
'SDO,
Total Fluoride (F)
m
Grab
SDO
ToiaBii1fife
m
'Grab
SDO
Total Hardness
m
Crab
SDO
Total RainfaI14
inches
semi-annual
Rain
gauge
Footnotes:
Measurement Frequency:, Twice per year or during the specified period, during a measureable storm
event.
2 1 COC No. NCG120101
effective January 6, 2014
N

2 `Sample collection must begin within the first30 minutes of discharge and continue to all outfalls until
completed.
3 Sample Location: Samples`shall be collected at each,stormwater discharge outfall (SDO) unless
representative outfall status (ROS) has been granted by NC Division of Energy, Mineral, and Land
Resources (DEMUR). A copy of the DEMLR letter granting ROS must be kept on site. DEMLR's ROS letter
remains,in effect.through the subsequent,reissuance of this permit and as long as the pertinent site
conditions, and operations remain unchanged, unless the ROS letter provides for other conditions or
duration.
4 For-each,sanipled measureable storm�event the total precipitation must he recorded from an on-site rain
gauge. C here isolated sites are unmannedfor extended periods, a local rain_ gauge reading may be,
substituted "o an ori-s,te gauge., Upon prior DEAILR written approval.)
5 No benchmark applies for'these parameters. However, levels above 0.34 mg/l As, 0.056 mg/1,Se, or
,outside a pH range of'6.q-9.0 S.0 should be noted on the Stormwater Data,Monitoring Report (SDMR)
submitted to-,NC-DENR-- - -
This Certificate of Coverage shall become effective January -6, 2014.
This Certificate of Coverage shall remain in effect for the duration of the General Permit., _
Signed this day, January 6, 2014.
for Tracy E. Davis, P.E., Director
Division of Energy, Mineral, and Land Resources
By the, Authority -of the Environmental Management Commission_
3 CUC No. NCG1ZU1U1
effective January 6, 2014

W CATION MAI' ,
NCG120101
Map Scile 1:24, 000
Duke Energy Progress, Inc.
Mayo Steam Electric Plant Monofill
Latitude: 360 32'00" N
Longitude: 780 55' 21" W
County: Person
Receiving Stream: Baves Branch
Stream Class: C
Sub -basin: 03-U2-05 (Roanoke River Basin)
Facility Location