NCG120101_Mayo Monofill Monitoring COC Modification_20140520

Fit
CD
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
William J. Thacker
Duke Unergy Progress, Inc,
Mayo Steam Electric Plant
10660 Boston Road
Roxboro, NC 27574
Dear Mr. Thacker -
John E. Skvarla, III
Secretary
May 20, 2014
subject; General Permit: No. NCO120000
Mayo Steam Plant: MAn0ffll
CBC NC6120101
Person County
We received your request to modify the monitoring provisions in the above permit
Certificate of Coverage (COC) on May 15, 2014. You requested to delay the initial sampling
period of several of the additional parameters by six months to allow time for the monofill to
begin full operation. Your request has been approved, and the modified monitoring schedule
is attached. Please replace the second page of your COC with the enclosed revision.
This permit does not affect the legal requirements to obtain other permits which may
be required by the Division of Energy, Mineral 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 you have any questions concerning this permit
modification, please contact Bradley Bennett at telephone [phone], or Bethany
Georgoulias at telephone [phone].
Sincerely,
for Tracy E. Davis, P.E., CPM
cc: Toby Vinson, Land Quality Section
Dave Parnell, Raleigh Regional Office
Autumn Romanski, DWR Raleigh Regional Office
Sergei Chernikov, DWR Water Quality Permitting Section
Stormwater Permitting Program Files
DWR Central Files
enclosure
Division of Energy, Mineral, and Land Resources
Energy Section • Geological Survey Sectlon - Land Quallty Section
1612 Mail Service Center, Raleigh, North Carolina 27699-1612.919-707-92001 FAX: [phone]
512 North Salisbury Street, Raleigh, North Carolina 27604 • Internet: http:l/portal,ncdenr.ora/web/Ir/
An Equal Opportunity l Affirmative Action Employer — 50% Recycled 110% Post Consumer Paper

TAW I Anolytical MonitaringRequirements
9tN
v—
VIs
a
Chemical Ox en Demand
mgzl
semi-annual
Grab
SDO
Fecal Coliform
# Per 100 ml
semi-annual -
Grab
SDO
Total Sus ended Solids
ma/l
semi-annual - nnual
'Grab
SDO
Arsenic LAO
mg1I
semi-annual
Grab
SDIO,
I Selenium (Se
mg/l
semi-annual
Grab
SPO
-15
-Boron (8 )5
mg/1
semi-annual
G-rab
SDO
"20' =
S.0,
semi-annual y
Grab
SDO
Cond uctivity
S
semi-annual
Grab
SDO
Antimony (Sb)', tqtyl
mg/1
Grab
SDO
Recoverable
Barium (Ba), Total
mg/1
Grab
SDO
Recoverable
Beryllium (00, Total
mg/l
Grab
SDO
Recoverable
Cadmium (Cd),, Total
mg/l
Grab
Soo
Recoverable
Chromium (Cr), T6tal
mg/l
Grab
SDO
Recoverable
Copper (Cu), Total
mg/1
Grab
SDO
Recoverable- - —
Lead (Pb), Total
mg/1
Grab
SDO
Recoverable
'Once during Jul, 1-Dec'31,2014;
Mercury (Hg), Total
mg/I_
GrabRecoverable
SDO
Once during Jan 1 -Jun 30, 2017
Molybdenum (M o), Total
mg/l
Grab
SDO
Recoverable
Nickel (Ni), Total
mg/1
Grab
. 0
SDf7
Recoverable
(Ag), Total
mg/l
Grab
Recoverable
_SDO
Thallium (TI),'Toial
SD©
RecoverableGrab
Zinc (Zn), Total'
mg/1
Grab
SDO,
Recoverable
Total Chloride (CI)
m
Grab
SUO
Total Fluoride (F)
m
Grab
Total Sulfate
m
Grab
-sbo
00
Total Hardness
In
Grab
SDO
Total RainfaI14
inches
semi-annual
Rain
gauge
-
Footnotes:
1 Meastifementfrequency: Twice per year,or during the,specified,period, during a measureable storm event
2 1 COC No. NCG120101
effective January 6, 2'014, modified May 20, 2014