Mayo Steam Station Wastewater SOC

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NCDEW
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Chares Wakild, P.E.
Governor Director
June 26, 2012
Mr. Charles M. Gates, Vice President —Power Generation 11D
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Progress Energy Carolinas
P. O. Box 1551 i
Raleigh, NC 27602-1551 l
Dee Freeman
Secretary
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Subject: SPECIAL ORDER BY CONSENTCE
R+leiollfiP^rNC hR1 nae
EMC SOC WQ S10-012
Progress Energy Carolinas, Inc. — Mayo Steam Electric Plant WWTP
NPDES Permit NCO038377
Person County
Dear Mr. Gates:
Attached for your records is a copy of the signed Special Order by Consent approved by the
Environmental Management Commission.
The terms and conditions of the Order are in full effect, including those requiring submittal of written
notice of compliance or non-compliance with any schedule date.
Pursuant to North Carolina General Statute 143-215.31), water quality fees have been revised to include
an annual fee for activities covered under a Special Order by Consent. Progress Energy will be subject
to a fee of $500.00 on a yearly basis while under the Order. The initial fee payment will be invoiced at a
later date, with future fee invoicing done on an annual basis.
If you have any questions concerning this matter, please contact the Surface Water Protection Section
staff in the Raleigh Regional Office at [phone] or Bob Sledge at [phone].
Sincegrely,
Ch rtes Wakild, P.E.
Attachment
cc: Jeanne Phillips, ITS
Central Files
NPDES Unit — SOC File
Raleigh Regional Office, Surface Water Protection
Don Joe — EPA Region 4
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Ralegh, North Carolina 27604 0110
Phone: 919M7-63001FAX: [phone] No -thCarolina
Internet: www.ncwaterfrnaVve Ac ` hzra l
An Equal Oppodunity l ArfirmaUve Action Employer 11 J

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
COUNTY OF PERSON
IN THE MATTER OF )
NORTH CAROLINA
CAROLINA POWER & LIGHT COMPANY )
d/b/a )
PROGRESS ENERGY CAROLINAS, INC. )
MAYO STEAM ELECTRIC PLANT )
NPDES PERMIT NCO03 83 77 )
SPECIAL ORDER BY CONSENT
EMC SOC WQ S10-012
Pursuant to provisions of North Carolina General Statute (G.S.) 143-215.2, this Special Order by Consent
is entered into by Carolina Power & Lipht d/b/a Progress Energy Carolinas, Inc., hereinafter referred to
as Progress Energy, and the North Carolina Environmental Management Commission, an agency of the
State of North Carolina created by G.S. 14313-282, and hereinafter referred to as the Commission:
1. Progress Energy and the Commission hereby stipulate the following:
a. Progress Energy operates a steam electric power plant facility and holds NPDES permit
NCO038377 to discharge process control and industrial waste streams to Moo Laky" s. � r.
WS -v waters of this state in the Roanoke River Basin, in Person County.I , t, IA15
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b. Progress Energy installed wet limestone forced oxidation wet scni'��1 utut' �9 Z v
at the Mayo Steam Electric Plant in response to requirements from the State of North
Carolina under the Clean Smokestacks legislation. Accordingly, Progress Energy installed a
Flue Gas Desulfurization (FGD) wastewater settling pond, a bioreactor (a biological
treatment system), and a flush pond to treat wastewater generated by the recently added wet
scrubbers.
C. Since installation of settling pond, flush pond and bioreactor Progress Energy has:
• upgraded the ash handling system to handle fly ash at the plant as dry ash, except
during maintenance outages of the dry ash system, to reduce pollutant loading to the
outfall;
• Investigated treatment modifications and optimizations which have resulted in:
- installation and use, on an as needed basis, of a chemical injection system to
aid in the settling of mercury and other constituents in the settling pond;
- addition of a pH adjustment system to the inlet of the bioreactor to aid in
keeping the pH of the wastewater at an optimum level for maximum
treatment efficiency;
- placing into service secondary hydrocyclones to reduce the amount of
suspended solids in the blowdown to the settling pond.

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EMC SOC WQ S 10-012
p. 2
d. Since the introduction of treated FGD wastewater into the system and the effective dates for
certain effluent limitations, sampling of effluent from Outfall 002 (Ash Pond Treatment
System) has indicated the overall treatment system is unable to consistently meet final
effluent limits for Mercury, Boron, Thallium, Manganese and Selenium.
e. Noncompliance with final effluent limitations constitutes causing or contributing to pollution
of the waters of this State named above, and Progress Energy is within the jurisdiction of the
Commission as set forth in G.S. Chapter 143, Article 21.
f. Compliance will require study, investigation of the circumstances and construction.
g. Progress Energy has committed to providing necessary funding, for planning, designing, and
constructing an enhanced wastewater handling, treatment and disposal system, which, once
constructed and operated for a period of time, will be sufficient to manage wastewater to such
an extent that the discharge from the Mayo Steam Electric Plant will be able to comply with
final effluent limits.
h. Since this Special Order is by consent, neither party will file a petition for a contested case or
for judicial review concerning its terms.
2. Progress Energy, desiring to attain frill compliance with the permit and final effluent limitations
(permit identified in paragraph La. above), hereby agrees to do the following:
a. Undertake the following activities in accordance with the indicated time schedule described
in Attachment A:
(1) Investigations. Conduct investigations into available treatment operations, measures or
technologies that once constructed and operated for a period of time, will be expected to
provide measures to such an extent that the pollutants discharged from the Mayo Electric
Generating Plant will be significantly reduced and the discharge will be able to comply
with final effluent limits. Progress Energy must communicate in writing the results of the
investigations whereby a report of the proposed changes and installation of zero liquid
discharge for certain wastewaters will illustrate how the reduction of the pollutants from
the Mayo Electric Generating Plant NPDES discharge will be achieved (first action item
of Attachment A). Progress Energy is to submit a written investigations report to the
Raleigh Regional Supervisor, Division of Water Quality, Surface Water Protection
Section, 1628 Mail Service Center, Raleigh, NC 27699-1628, and one copy must be
mailed to the Point Source Branch, Division of Water Quality, 1617 Mail Service Center,
Raleigh, NC 27699-1617.
(2) Construction. Based upon the data collection, investigations and analyses noted in 2.a. (1)
above, begin construction of new treatment facilities including zero liquid discharge for
certain wastewaters and modification of existing facilities or processes as appropriate and
secure all applicable permits for such activities in accordance with the schedules set forth
in Attachment A. Progress Energy is to submit a construction schedule (second action
item in Attachment A) to the Raleigh Regional Supervisor, Division of Water Quality,
Surface Water Protection Section, 1628 Mail Service Center, Raleigh, NC 27699-1628,
and one copy must be mailed to the Point Source Branch, Division of Water Quality,
1617 Mail Service Center, Raleigh, NC 27699-1617. This schedule must detail major
construction milestones and adhere to the schedules set forth in Attachment A (including
the end date) of this Order.

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EMC SOC WQ S 10-012
o. 3
(3) Permit modification. Progress Energy is required to submit NPDES permit modification
request(s) prior to decommissioning the existing treatment facilities and/or the online use
of new treatment units)/system(s). Submit permit modification requests to the Point
Source Branch, Division of Water Quality, 1617 Mail Service Center, Raleigh, NC
27699-1617.
b. Undertake the following activities in accordance with the indicated time schedule established
in Attachment A and Attachment B.
(1) Quarterly Progress Reports. Progress Energy will submit quarterly progress reports
detailing the work and activities undertaken with regard to schedules and activities
included in this SOC. The reports are to be submitted as follows: one copy must be
mailed to the Raleigh Regional Supervisor, Division of Water Quality, Surface Water
Protection Section, 1628 Mail Service Center, Raleigh, NC 27699-1628, and one copy
must be mailed to the Point Source Branch, Division of Water Quality, 1617 Mail Service
Center, Raleigh, NC 27699-1617. The quarterly reports are due to be submitted no later
than January 31, April 30, July 31 and October 31 for the duration of this order or until
permit compliance is achieved.
(2) Final Written Account. The purpose of this Final Written Account is to demonstrate the
reduction of pollutants discharged from the Mayo Electric Generating Plant and the
respective ability of the new wastewater facilities to meet effluent limits. Specifically,
Progress Energy must illustrate the differences in the waste stream characteristics (using
both concentration and mass loadings) of Mercury, Selenium, Boron, Manganese and
Thallium between the current waste stream and the waste stream at the conclusion of this
Order. This Final Written Account shall provide the means by which Progress Energy
will demonstrate compliance with the NPDES Permit for the purposes of this Order.
The Final Written Account must be submitted to the Raleigh Regional Supervisor,
Division of Water Quality, Surface Water Protection Section, 1628 Mail Service Center,
Raleigh, NC 27699-1628, and one copy must be mailed to the Point Source Branch,
Division of Water Quality, 1617 Mail Service Center, Raleigh, NC 27699-1617 in
accordance with Attachment A.
(3) Constniction Completion. Begin and complete construction of zero liquid discharge anT"'
modified wastewater treatment facilities or other measures in accordance with the
schedule described in Attachment A. Provide written notice within 30 days of
construction completion to the Raleigh Regional Supervisor, Division of Water Quality,
Surface Water Protection Section, 1628 Mail Service Center, Raleigh, NC 27699-1628,
and one copy must be mailed to the Point Source Branch, Division of Water Quality,
1617 Mail Service Center, Raleigh, NC 27699-1617 in accordance with Attachment A.
(4) Interim Limits. Comply with all terms and conditions of the NPDES Permit except those
effluent limitations identified as interim limitations in Attachment B (Mercury, Selenium,
Boron, Manganese and Thallium). During the time the SOC is effective, Progress Energy
shall comply with the interim effluent limitations for Mercury, Selenium, Boron,
Manganese and Thallium as listed in Attachment B. A written notice must be submitted
no later than fourteen (14) calendar days after failure to comply with any Interim Limits
in Attachment B. Written notice must be submitted to the Raleigh Regional Supervisor,
Division of Water Quality, Surface Water Protection Section, 1628 Mail Service Center,
Raleigh, NC 27699-1628. A copy must also be mailed to the Point Source Branch,

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4 r-
EMC SOC WQ S 10-012
p. 7
Attachment A: Schedule
Action Item
Start
End
Reporting
requirements
Provide written
investigations report
Within 45 days of the
to RRO and Central
Office within 225
(1)Investigations
effective date of this
180 days from Start
Order
days of the effective
date of this order [see
2.a. 1.
Within 60 days of
(2)Submit Construction
DWO approval of
written investigations
Submit proposed
schedule to RRO and
Schedule
report from 2.a.(t.)
Central Office [see
submit the construction
2.a.(2)1
schedule.
According to
(3)Begin Construction
Within 90 Days of
obtaining all applicable
construction schedule.
not to exceed 1000 days
Construction status
must be
communicated in
quarterly report
12.b.(1) and 2.b(3)1
from obtaining all
permits and
authorizations or at
maximum the end date
permits and
authorizations
of this order
Upon completion of
(4)End Construction
Within 30 Days of
completingconst ruction
Provide notice to the
RRO and Central
Office
construction written
notice must be
provided to DWO
2.b. (3)].
Operational Status
must be
communicated in
quarterly report
12.b.(1)1. Provide
(5)Achieve Compliance
365 days after
construction is
completed.
Final Written
Account 12.b.(21
illustrating pollutant
with NPDES Permit
Limits
loading reduction
12.b.(2)1. within 545
days of construction
com letion.

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