NC0003425_Fact Sheet_20160824

DEPARTEMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NC0003425
Facility Information
Applicant/Facili Name:
Duke Energy Progress/ Roxboro Steam Electric Generating Plant
Applicant Address:
1700 Dunnaway Rd., Semora, NC 27343
Facility Address:
1700 Dunnaway Rd., Semora, NC 27343
Permitted Flow
Not limited
Type of Waste:
99.8 % Industrial, 0.2% - domestic
Facility/Permit Status:
Existing/ Renewal
County:
Person
Miscellaneous
Receiving Stream:
Hyco Reservoir
Stream
Classification:
WS-V, B
Subbasin:
03-02-05
303 d Listed?:
No
Drainage Area mi2):
Lake
Primary SIC Code:
4911
Summer 7Q10 cfs)
0
Regional Office:
RRO
30Q2 cfs :
0
Quad
Olive Hill
Average Flow cfs :
0
Permit Writer:
Teresa Rodriguez
IWC (%):
100%
1 Date:
8/23/2016
Summary
The Roxboro Steam Electric Plant is an electric generating facility that uses steam turbine
generation (via four coal-fired units with a total net capacity of 2558 MW). Units No. 1 and 2
(385 MWe and 670 MWe, respectively) use condensers as cooling devices. Units No. 3 and 4
(707MWe and 700 MWe, respectively) use cooling towers as cooling devices.
The facility has three existing cooling water intake structures (CWISs). The source water for
CWISs No. 1 and 2 is the Hyco Reservoir. The source water for CWIS no. 4 is the site's cooling
canal. The facility total intake is approximately 1,114 MGD. The facility discharges to subbasin
030205 in the Roanoke River Basin. Discharges are mostly industrial, with a very small
domestic flow (internal Outfall 008) piped to the on -site ash pond. Discharges from the ash
pond (internal Outfall 002), once -through cooling water and FGD treatmet syeem (internal
outfall 010) are discharged to the Discharge Canal (outfall 003). The Discharge Canal and Coal
Pile Runoff (outfall 006) both discharge to Hyco Reservoir. The Hyco Reservoir is a 17.6 km2
waterbody constructed in 1963 by CP&L to serve as a cooling water source. The receiving
waterbody is class WS-V; B. The facility is located in the Lower Piedmont area of the state, the
applicable state water quality temperature standard is 32'C (89.6' F).
This facility is subject to EPA effluent guideline limits per 40 CFR 423 - Steam Electric Power
Generating Point Source Category which were amended November 3, 2015. The facility is also
subject to the Cooling Water Intake Structures Rules (40 CFR 125) effective October 14, 2014.
The intake flow is > 125 MGD.

NPDES PERMIT FACT SHEET
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Roxboro Steam Electric Plant
NPDES No. NC00003425
The facility operates five internal outfalls and two outfalls to Hyco Reservoir. Duke requested
the addition of two new outfalls on the permit; one to reflect the future treatment system for the
low volume wastes as the ash basin will be closed and one for seeps and stormwater.
Description of existing outfalls:
• Outfall 003 - Heated Discharge Canal to Hyco Reservoir. The discharge canal combines
all internal outfalls (002, 005, 008, 009, 010) before discharging to Hyco Reservoir. In
addition, once -through cooling water from condensers for units 1,2, and 3, once -through
cooling water from heat exchangers, seepage from ash pond, and stormwater runoff
from plant drainage areas are discharged to the discharge canal.
Outfall 006 - Coal Pile Runoff discharges directly to Hyco Reservoir. Coal pile runoff
wastewaters include runoff from the coal pile, limestone pile and gypsum pile, truck
wheel wash area and coal handling areas. Treatment is accomplished by neutralization,
sedimentation and equalization.
Internal Outfall 002 - Ash Pond discharging to the discharge canal. The ash pond
receives wastewater from the following source:
• Bottom ash transport waters
• Silo wash water
• Ash landfill leachate and runoff (this landfill receives CCR from Mayo and
Roxboro plants)
• Dry -ash handling system wash water
• Blowdown from Unit 4 cooling tower
• Coal mill rejects and pyrites
• Sewage treatment plant effluent
• Low volume waste consisting of boiler blowdown, equipment maintenance
cleaning wastewaters, RO reject wastewater and floor drains. Low volume
wastes are treated by neutralization.
• Emergency overflow from FGD system blowdown.
The ash pond uses precipitation, adsorption, and settling for treatment, which has been
determined by NC to be BAT for this facility.
• Internal Outfall 005 - Cooling tower blowdown from Unit 4.
• Internal Outfall 008 - Treated domestic wastewater. The treatment system consists of a
screen, communitor, surge tank, aeration tank, clarifier, chlorine contact chamber and
sludge holding tank. A new package plant will be installed to replace the existing plant.
• Internal Outfall 009 - Chemical metal cleaning waste. Wastewaters from cleaning of the
boilers is generated every five to eight years. Every three to five years wastewaters are
generated from cleaning the heat exchangers. The wastewaters generated can be treated
by evaporation or by neutralization and precipitation.
• Internal Outfall 010 - Flue Gas Desulfurization (FGD) treatment system discharging to
the discharge canal. The scrubber system removes SOx by mixing flue gas with a

NPDES PERMIT FACT SHEET
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Roxboro Steam Electric Plant
NPDES No. NC00003425
limestone slurry. The blowdown from the scrubber is discharged to a gypsum settling
pond system then to a bioreactor which utilizes microorganisms to reduce soluble
contaminants to insoluble forms (under anaerobic conditions) that then precipitate from
solution. Wastewater is discharged to the ash pond effluent channel. An emergency
overflow from the FGD system blowdown discharges to the ash pond.
Proposed Outfalls:
Outfall 001 (Seeps) - The facility identified 16 unpermitted seeps. Seven seeps are
engineered drains from the ash basin flowing to the discharge canal. Four non -
engineered seeps also flow to the discharge canal. Four seeps from the ash landfill and
one from the gypsum pile flow to the intake canal through a common outfall. This
outfall was previously designated as outfall 001 in the permit and will be reinstated to
monitor the seeps.
Internal Outfall 012 - Low volume waste and other wastewaters. Duke will build a new
dual basin treatment system to treat wastewaters than now go to the ash basin.
CWA 316 (b)
The permittee shall comply with the Cooling Water Intake Structure Rule per 40 CFR 125.95.
The Division approved the facility request for an alternative schedule in accordance with 40
CFR 125.95(a)(2). The permittee shall submit all the materials required by the Rule with the next
renewal application.
Temperature Mixing Zone - Outfall 003
The facility is located in the Lower Piedmont area of the state, the applicable state water quality
temperature standard is 32°C (89.6° F). The authorized temperature mixing zone for outfall 003
includes the North Hyco Arm downstream of NC Hwy 57, the main body of Hyco Reservoir
downstream of the confluence of the Cobbs Creek Arm and the North Hyco Arm and the entire
afterbay lake. USGS data at the afterbay monitoring station (USGS Station 02077303) was
reviewed for the period of January 2011 to April 2016. Data shows that the temperature water
quality standard was not exceeded for this period. Maximum temperature recorded was 305C.
Instream Monitoring
The permit requires monitoring of Hyco Reservoir in accordance to the Biological Monitoring
Program as approved by the Division. Based on the Divisions review of the reports the fish
community is comparable to other piedmont reservoirs and no problems were noted.
DATA REVIEW/PERMIT REQUIREMENTS
Internal Outfall 002 - Ash Pond
This outfall is subject to the Effluent Limitations Guidelines (ELG) in Table 1.
Table 1. ELG Outfall 002 (Prior to November 1, 2018)
Pollutant
Daily Maximum
Monthly
Average
ELG
TSS
100 m / 1
30 m / 1
40 CFR 423.12 (b) (4)
Oil & Grease
20 mg/1
15 m /l
40 CFR 423.12 (b) (4)

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Roxboro Steam Electric Plant
NPDES No. NC00003425
After November 1, 2018 no discharge of bottom ash transport water is allowed as per 40 CFR
423.13 (k) (1) (i). Compliance with this section shall be as soon as possible but no later than
December 31, 2023. Duke has submitted a schedule of compliance for meeting the rule by April
30, 2021. Fly ash transport water is not discharge so they will meet the compliance date of
November 1, 2018.
The current permit requires monitoring for flow and total selenium, limits for Oil & Grease and
TSS. A summary of DMR data for the period of January 2011 to January 2016 is included in
Table 2. There have been no violations of permit limits or conditions.
Table 2. DMR Summary Outfall 002
Parameter
Average
Maximum
Minimum
Flow
10.8 MGD
48.3 MGD
3.1 MGD
TSS
5m /l
21m /l
<2.5m /l
Total Selenium
14.6 µ /l
68.8 µ /l
< 10 µ /l
O&G
<5m /l
13.5m /l
<5m /l
Table 3. Monitoring Requirements/Proposed Changes Outfall 002
Parameter
Monitoring
Changes
Basis
re uirements
Flow
Monitor
No changes
15A NCAC 2B.0505
TSS
30 mg/1 monthly aver
No changes
40 CFR 423.12(b)(4)
100 mg/1 daily max
Oil & Grease
15 mg/1 monthly aver
No Changes
40 CFR 423.12(b)(4)
20 mg/1 daily max
Total
Selenium
Monthly monitoring
No changes
Pollutant of concern.
Turbidity, pH
No requirement
Monitor
Pollutant of concern for
dewatering/ decanting
Internal Outfall 002 - Dewatering
To meet the requirements of the Coal Ash Management Act of 2014, the facility needs to
dewater two ash ponds by removing the interstitial water and excavate the ash to deposit it in
landfills. The facility's highest discharge rate from the dewatering process will be 1 MGD. The
facility submitted data for the standing surface water in the ash ponds, interstitial water in the
ash, and interstitial ash water that was treated by filters of various sizes. The following
pollutants were detected at concentrations higher than the water quality standards: selenium,
arsenic and molybdenum. A new effluent and monitoring sheet is included in the permit for the
ash pond dewatering phase. As this is an internal outfall the water quality standards are not
applied. Monitoring will be required for selenium, arsenic, molybdenum, antimony and copper.
Ash Pond Dams:
Seepage through earthen dams is common and is an expected consequence of impounding
water with an earthen embankment. Even the tightest, best -compacted clays cannot prevent
some water from seeping through them. Seepage is not necessarily an indication that a dam has
structural problems, but should be kept in check through various engineering controls and

NPDES PERMIT FACT SHEET Roxboro Steam Electric Plant
Page 5 NPDES No. NC00003425
regularly monitored for changes in quantity or quality which, over time, may result in dam
failure.
Outfall 003 - Discharge Canal (Combined outfalls)
DMR/ Compliance Review
Data were reviewed for the period of January 2011 to March 2016. There have been no
violations of permit limits or conditions.
Table 4. DMR Summary Outfall 003
Parameter
Average
Maximum
Minimum
Flow MGD
840
1130
6.9
TRC
Not discharged
TP (mg/1)
< 0.036
< 0.05
< 0.05
TN (mg/ 1
0.68
1.08
0.44
Temperature °C
29
41
130C
Total Arsenic µ /1
6.2
17.1
< 2.8
H SU
7.34
8
6.38
Toxicity Testing (003):
Current Requirement: Acute P/F at 90%, February, May, August, November.
Proposed Requirement: Acute P/F at 90%, February, May, August, November.
The facility passed 21 tests out of 21 tests performed for the period of January 2011 to January
2016.
Reasonable Potential Analysis Outfall 003:
The Division conducted EPA -recommended analyses to determine the reasonable potential for
toxicants to be discharged at levels exceeding water quality standards/EPA criteria by this
facility from outfall 003. For the purposes of the RPA, the background concentrations for all
parameters were assumed to be below detection level. The RPA uses 95% probability level and
95% confidence basis in accordance with the EPA Guidance entitled "Technical Support
Document for Water Quality -based Toxics Control." With the approval of the Triennial Review
(2007-2014) of the NC Water Quality Standards by the Environmental Management
Commission (EMC) in 2014 and US -EPA (with some exceptions) on April 6, 2016, the NPDES
Permitting Unit is required to implement the new dissolved metal standards in all permits
public noticed after April 6, 2016. The RPA included evaluation of dissolved metals' standards,
utilizing measured hardness value of 100 mg/L CaCO3 for hardness -dependent metals.
A reasonable potential analysis was conducted for arsenic, copper, nickel, selenium, strontium,
thallium, chlorides and zinc. Arsenic data used for the RPA was collected between 2011 and
2016. Data for the remaining parameters was from a special study for the period of March 2010
to August 2011. Based on this analysis, the following permitting actions are proposed for this
permit:
• Monitoring Only. The following parameters will receive a monitor -only requirement
since they did not demonstrate reasonable potential to exceed applicable water quality
standards/criteria, but the maximum predicted concentration was >50% of the
allowable concentration: Arsenic, selenium, chloride and thallium.
• No Limit or Monitoring: The following parameters will not receive a limit or monitoring,
since they did not demonstrate reasonable potential to exceed applicable water quality

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Roxboro Steam Electric Plant
NPDES No. NC00003425
standards/criteria and the maximum predicted concentration was <50% of the
allowable concentration: copper, nickel, strontium, and zinc.
Mercury Evaluation Outfall 003:
A mercury evaluation was conducted in accordance with the permitting guidance developed
for the implementation of the statewide Mercury TMDL to determine the need for a limit and
Mercury Minimization Plan (MMP). Monitoring for mercury is not required for outfal1003 but
mercury data was collected during a special study during the period of March 2010 to August
2011. The water quality based effluent limitation (WQBEL) for mercury is 12 ng/1. The
technology based effluent limit (TBEL) is 47 ng/l. None of the annual averages exceeds the
WQBEL or TBEL, no limit is required. See the attached mercury evaluation spreadsheet.
Table 5. Mercury Evaluation
2010
2011
# of Samples
20
16
Annual Average, n /L
3.6
4.4
Maximum Value, n /L
7.63
6.92
TBEL, n /L
47
WQBEL, n /L
12.0
Table 6. Monitoring Requirements/Proposed Changes Outfall 003
Parameter
Monitoring
Changes
Basis
17
re uirements/Limits
Flow
Monitor
No changes
15A NCAC 2B.0505
TRC
200 µg/l
Modified limit to
State WQ standards, 15A
instantaneous max
28 µg /1 daily max
NCAC 2B .0200. The water
quality standard is more
stringent than the effluent
uidelines limit.
TP
Monitor
No changes
15A NCAC 2B .0500
TN
Monitor
No changes
15A NCAC 2B .0500
Temperature
Monitor
No changes
Approved Mixing zone
Total Arsenic
Monitor
No changes
Based on results from
RPA, Predicted
concentration greater than
50% of allowable.
Total Selenium
No requirement
Quarterly
Based on results from
monitoring
RPA, Predicted
concentration greater than
50% of allowable.
Total Thallium
No requirement
Quarterly
Based on results from
monitoring
RPA, Predicted
concentration greater than
50% of allowable.
Chloride
No requirement
Quarterly
Based on results from
monitoring
RPA, Predicted

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Roxboro Steam Electric Plant
NPDES No. NC00003425
concentration greater than
50% of allowable.
pH
6 to 9 SU
No changes
State WQ standards,15A
NCAC 2B .0200
Acute toxicity
P/F 90%
No changes
State WQ standards,15A
NCAC 2B .0200
Internal Outfall 005 - Cooling Tower Blowdown from Unit 4
This outfall is subject to the ELGs in Table 7.
Table 7. ELG Outfall 005
Pollutant
Daily Maximum
11FMonthly
ELG
Average
H
6 to 9 SU
40 CFR 423.12 (b) (1)
Free Available
0.5 mg/1
0.2 mg/1
40 CFR 423.12 (d) (1)
Chlorine
126 Pollutants
No detectable amounts
40 CFR 423.13 (d) (1)
Total
Chromium
0.2 mg/1
0.2 mg/1
40 CFR 423.13 (d) (1)
Total Zinc
1.0 mg/1
1.0 mg/1
40 CFR 423.13 (d) (1)
The permit includes monitoring for flow and Total Residual Chlorine (TRC), limits for Free
Available Chlorine, Total Chromium, Total Zinc and 126 priority pollutants.
Special condition A. (14) in the permit doesn't allow the discharge of the cooling tower
blowdown to the discharge canal, it has to be discharged to the ash pond. With the
modifications planned to the site and the future closure of the existing ash pond Duke will like
to have the option to discharge the blowdown to the discharge canal. This will continue to be an
internal outfall subject to the same limits under 40 CFR 423. The limits apply before it comingles
with any other waste stream so there is no change in limits or other permit conditions by
allowing the cooling tower blowdown to discharge into the discharge canal.
DMR/ Compliance Review:
Data were reviewed for the period of January 2011 to January 2016. There have been no
violations of permit limits or conditions. Flow was the only parameter monitored at this outfall
since the facility did not chlorinate or added chromium or zinc for maintenance activities. Flow
is reported as 7.2 MGD on a daily basis.
Table 8. Monitoring Requirements/Proposed Changes Outfall 005
Parameter
Monitoring
Changes
Basis
Requirements/Limits
Flow
Monitor
No changes
15A NCAC 2B.0505
Free available
500 µg/l daily max
No changes
40 CFR 423.13 (d)(1)
chlorine
200 µ /l monthly average
Total Residual
Monitoring
No changes
40 CFR 423.13 (d)(2)
Chlorine
Total chromium
1200 µ /l daily max
I No changes
140 CFR 423.13 (d)(1)

NPDES PERMIT FACT SHEET
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Roxboro Steam Electric Plant
NPDES No. NC00003425
200 µ /1 monthly average
Total Zinc
1.0 mg/l daily max
No changes
40 CFR 423.13 (d)(1)
1.0 m / 1 monthly average
The 126 priority
pollutants
No detectable amount
No changes
40 CFR 423.13 (d)(1)
Outfall 006 - Coal Pile Runoff
This outfall is subject to the ELG in Table 9.
Table 9. ELG Outfall 006
Pollutant
I iff
Daily Maximum
Monthly
Average
ELG IN
TSS
50 m / 1
40 CFR 423.12 (b) (9)
pH
6 to 9 SU
40 CFR 423.12 (b) (1)
DMR/ Compliance Review:
Data were reviewed for the period of January 2008 to March 2013. There have been no
violations of permit limits or conditions.
Table 10. DMR Summary Outfall 006
Parameter
Average
Maximum
Minimum
Flow (MGD)
0.23
0.05
0.002
TSS (mg/ 1)
2.6
76.6
< 2.5
pH (SU)
7.39
8.9
6.04
Priority Pollutant Scan:
The application included the results of one scan. Selenium was detected above the water quality
standard. Monitoring for selenium was added to the permit.
Table 11. Monito ing Requirements/Proposed Changes Outfall 006
Parameter
11 Monitoring
NNhanges
Basis
re uirements/Li
Flow
Monitor
No changes
15A NCAC 213.05
TSS
50 mg/1 instantaneous
Added Monthly
40 CFR 423.12(b)(9),
max
average
ge limit of 30
40 CFR 122.45
l
pH
6 to 9 SU
No changes
40 CFR 423.12 (b) (1)
Total selenium
No requirement
Quarterly Monitoring
Detected in the PPA
Acute toxicity
P F 90%
/
No changes
State WQ standards,
15A NCAC 2B .0200

NPDES PERMIT FACT SHEET
Page 9
Internal Outfall 008 - Domestic WWTP
Table 12. DMR Review Outfall 008
Roxboro Steam Electric Plant
NPDES No. NC00003425
Parameter
Average
Maximum
Minimum
Flow MGD
0.007
0.01
0.002
TSS (mg/ 1
14.7
30
5
H SU
6.8
7.3
6.5
BOD m /1
10.4
28
2.1
NH3N (mg/1)
0.8
1.6
< 0.1
Table 13. Monitoring Requirements/Proposed Changes Outfall 008
P
Parameter
Monitoring
Changes
Basis
re uirements/Limits
Flow
0.015 MGD
Add effluent page
WWTP will be upgraded
for 0.025 MGD
during this permit cycle
TSS
30 mg/1 monthly aver
No changes
NPDES rules for
45 mg/1 daily max
secondary treatment of
domestic wastewater,
15A 2B .0400
pH
6 to 9 SU
No changes
State WQ standards, 15A
2B .0200
BOD
30 mg/1 monthly aver
No changes
NPDES rules for
45 mg/1 daily max
secondary treatment of
domestic wastewater,
15A 2B .0400
Total
Monitor
No changes
DWQ Policy
ammonia
Internal Outfall 009 - Chemical cleaning waste
Table 14. Monitoring Requirements/Proposed Changes Outfall 009
Parameter
Monitoring
Changes
Basis
requirements/Limits
Flow
Monitor
No changes
15A NCAC 2B.0505
Total Copper
1.0 mg/1 monthly aver
No changes
40 CFR 423.13 (e)
1.0 m / 1 daily max
Total Iron
1.0 mg/1 monthly aver
No changes
40 CFR 423.13 (e)
1.0 mg/1 dail max
TSS
30 mg/1 monthly aver
No changes
40 CFR 423.13 (e)
100 mg/1 dail max
Oil & Grease
15 mg/1 monthly aver
No changes
40 CFR 423.13 (e)
20 mg/1 dailymax
Internal Outfall 010 - FGD
This outfall is subject to the Effluent Limitations Guidelines (ELG) in Table 15. These are new
limitations promulgated November 3, 2015.

NPDES PERMIT FACT SHEET
Page 10
Table 15. ELG Outfall 010
Roxboro Steam Electric Plant
NPDES No. NC00003425
Pollutant
Daily Maximum
Monthly
Avera e
ELG
H
6 to 9 SU
40 CFR 423.12 b
1
TSS
100 m
/ 1
30 m
/ 1
40 CFR 423.12 b
11
Oil and grease
20 mg/1
15 m
/l
40 CFR 423.12 b
11
Total Arsenic
11 µ
/1
8 µ
/l
40 CFR 423.13
1 i
Total Mercury
788 n
/1
356 n
/1
40 CFR 423.13
1 i
Total Selenium
23 µ
/1
12 µ
/l
40 CFR 423.13 ()
(1) (i)
Nitrate/nitrite
17 mg/1
4.4 m
/l
40 CFR 423.13 (
) (1) (i)
The rule establishes compliance dates for the new limitations. Permittee must meet limits as
soon as possible beginning on November 1, 2018 but no later than December 31, 2023. Duke will
construct a new treatment system and requested a compliance date of December 31, 2023. As
the new treatment system will be placed in operation and the old pond may still discharge until
it is decommissioned. A new outfall is included in the permit for the new system.
The current permit includes monitoring for flow, total beryllium, total mercury, total antimony,
total selenium, total silver and total vanadium. Table 16 includes a summary of DMR data for
the period of January 2011 to January 2016. There have been no violations of permit limits or
conditions.
Table 16. DMR Summary Outfall 010
Parameter
Average
Maximum
Minimum
Flow MGD
0.84
1.77
0.01
Total Beryllium (µ /1)
3.9
10
< 1
Total Mercury (µ /1)
1.08
9.6
< 1
Total Selenium (µ /1)
102
712
< 50
Total Silver (µ /l)
6
8.4
< 5
Total Antimony (µ /1)
31
70
< 25
Total Vanadium (µ /1)
< 25
< 25
< 5
Table 17. Monitoring Requirements/Proposed Changes Outfall 010
Parameter
Monitoring
requirements/Limits
Changes
Basis
Flow
Monitor
No changes
15A NCAC 2B.0505
Total Beryllium
Monitor
Remove monitoring
Internal outfall, not a
parameter of concern.
Total Vanadium
Monitor
Remove monitoring
Internal outfall, not a
parameter of concern.
Total Antimony
Monitor
Remove monitoring
Internal outfall, not a
parameter of concern.
Total Silver
Monitor
Remove monitoring
Internal outfall, not a
parameter of concern.

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Roxboro Steam Electric Plant
NPDES No. NC00003425
Total Arsenic
No monitoring
Add limits of 11 µg/l
daily maximum and
40 CFR 423.13 1 i
(g) () ( )
8 µg/l monthly
average
Total Selenium
Monitor
Add limits of 23 µg/1
daily maximum and
40 CFR 423.13 (g) (1) (i)
12 µg/l monthly
average
Nitrate/Nitrite
No monitoring
Add limits of 17
mg/l daily
maximum and 4.4
40 CFR 423.13 (g) (1) (i)
mg/1 monthly
average
Total Mercury
Monitoring
Add limits of 788
ng/l daily maximum
40 CFR 423.13 1 i
(g) () ( )
and 356 ng/1
monthly average.
Proposed Outfalls:
Outfall 001
The facility identified 16 unpermitted seeps. Data collected on the seeps was reviewed to
determine the need for limits. Five seeps discharge to the intake canal at Hyco Reservoir. The
point of discharge is where former Outfall 001 used to discharge. The Division will reinstate
outfall 001 to monitor the discharge from the seeps.
Table 18. Outfall 001 Proposed Limits/Monitoring:
Parameter
Monitoring requirements/Limits
Basis
Flow
Monitor
15A NCAC 2B.0505
pH
11
State WQ standards,15A 2B
.0200
Total copper, total antimony,
total lead
Monitor
Detected below the wqs
Fluoride
Limit -1.8 mg/1
Detected above thew s
Total Arsenic
Limit -10 µ /l
Detected above the wqs
Total Selenium
Limits 5 µg/1 Monthly Average
56 µg/1 Daily Max
Detected above the wqs
Sulfites
Limit - 250 mg/l (Monthly
average & daily max)
Detected above the wqs
TDS, Hardness, Conductivity
Monitor
Parameters of concern
Acute toxicity
Quarterly Limit
State WQ standards,15A
NCAC 2B .0200
The remaining 11 seeps all drain to the discharge canal near the ash basin, 7 of those are
chimney drains from the ash basin dam. The flow from the combined seeps account for less
than 0.0005 % and will be included in the authorized wastewaters discharging through outfall
003.

NPDES PERMIT FACT SHEET
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Roxboro Steam Electric Plant
NPDES No. NC00003425
Internal Outfall 012
A new treatment system will be installed to divert wastewaters from the ash basin. The
proposed system consists of two lined basins discharging to the effluent discharge canal. Low
volume wastes, metal cleaning wastes, stormwater, and other miscellaneous wastes that are
routed to the ash basin will be routed to this new treatment system.
Table 19. Outfall 012 Proposed Limits/Monitoring:
Parameter
Monitoring
requirements/Limits
Flow
Monitor 15A NCAC 2B.0505
Total Suspended Solids
30 mg/1 Monthly Average 40 CFR 423.12 (b)(3)
100 mg/1 Daily Max
Oil & Grease
15 mg/1 Monthly Average 40 CFR 423.12 (b)(3)
100 mg/1 Daily max
ADDITIONAL CHANGES TO PERMIT
• A separate effluent page for the dewatering of the ash ponds (Outfall 002) was added to the
permit.
• Outfall 001 was reinstated to monitor discharge of seeps and stormwater.
• A new internal outfall (Outfall 011) was added to the permit to monitor the discharge from
the proposed FGD treatment system.
• A new internal outfall (Outfall 012) was added to the permit for the proposed retention
basin for wastewaters previously treated in the ash pond.
• Special Condition A.(14) that prohibited the discharge of cooling tower blowdown from
outfall 005 to the discharge canal was eliminated from the permit.
• A special condition was added to describe Section 316(b) requirements for submittal of
applicable information.
• A special condition was added to the permit to require an Ash Pond Closure Plan
• A Special Condition was added to the permit to require compliance with Senate Bill 729
(Coal Ash Management Act).
• Attachment 1 entitled "Groundwater Monitoring Plan" was added to the permit.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice: August 24, 2016
Permit Scheduled to Issue: October 17, 2016
STATE CONTACT
If you have any questions on any of the above information or on the attached permit, please
contact Teresa Rodriguez at [phone].
NAME: � DATE: 8/24/2016