NCS000580_MONITORING INFO_20190731

STORMWATER DIVISION CODING SHEET
NCS PERMITS
PERMIT NO.
/ � D �
�� ✓ o
v
DOC TYPE
[I FINAL PERMIT
t MONITORING REPORTS
❑ APPLICATION
❑ COMPLIANCE
❑ OTHER
DOC DATE
I(
❑ D, I o']
YYYYMMDD

DUKE
ENERGY,
PROGRESS
File: Mayo 12520-R
NC Department of Environmental Quality
Division of Water Quality
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
July 25, 2019
Mayo Steam Plant
Duke Energy Progress
10660 Boston Road
Roxboro, NC 27574
Subject: 15A N. C. Admin. Code 213 .0506
Mayo Electric Generating Plant
National Pollutant Discharge Elimination System Stormwater Permit NCS000580
Stormwater Discharge Outfalls 002, 006A and 010 Monitoring Report
Dear Sir or Madam:
In accordance with Part III. Section E2 of NPDES Stormwater Permit Number NCS000580, enclosed is
the year 3, period 2, 2019 Stormwater Discharge monitoring report for Outfalis 002, 006A and 010 for
Duke Energy Progress, LLC. - NPDES Stormwater Permit Number NCS000580.
I certify,, ittitle r penalty of Icm% that this docannent and all attachments were prepared under m1' direction or
supervision in accordance with a system designed to assure that alrtalifted personnel properly ,gather and embiate
the information submitted. Based on mar inquiry of the person or persons who manage the system, or those persons
directly responsible forgathering the itformation, the information sttbrrtitted is, to the hest of my knowledge cartd
belief, true, accurate, and complete. I arm aware that there are significant penalties for submitting false information,
including the possibility of fumes and imprisonment for knowing violations.
Please contact Ms. Lori Tollie at [phone] if there are any questions concerning the data in this
submittal.
Sincerely,
Tom Copolo- Manager
Mayo Electric Generating Plant
RECEIVE 0
Enclosures JUL 31 Z019
LPW/lpw
EN } RSECTION

STORNIWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number: NCS000580 SAMPLES COLLECTED DURING CALENDAR YEAR: 2019
(This monitoring report shall be received by the Division no later than 30 days from
the date the facility receives the sampling results from the laboratory.)
FACILITY NAME Mayo Electric Steam Plant
PERSON COLLECTING SAI7PLE(S) Joseph Heath Slade
CERTIFIED LABORATORY(S) Duke, Shealv Lab# 248 & 329
_Mayo Plant Lab Lab #_5064�
Part A: Specific Monitoring Requirements
COUNTY Person
PHONE NO. [phone]
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 3.
Outfall
No.
Date
Sample Collected
00400
39516
01119
00981
7I901
01092
00530
Total
Rainfall°
pH'
PCBs
Copper'
Total
Selenium
Total
Mercury-
Total
Zinc
Total
TSS
Non -Polar
Oil & Grease
mo/dd/ yr
inches
I Standard
m
m
m
m
MeA
m
Benchmark
6-9
Detected
0.010
0.056
N/Az
0.126
100
15
002
06/18/19@ 19:30
1.89
7.05
ND <0.40
0.0568
0.00117
0.0000699
0.137
1300
ND<5
006A
06/18/19@18:05
1.89
See Comment
010
06/18/19@17:45
1.89
6.18
0.00511
<0.001
0.000021
0.016
89
ND<5
Outfall
Additional Priority Pollutant Metals5
00999
01079
00978
00998
01113
01118
01074
01114
01268
00982
No.
Boron'
Ag'
As
Be
Cd'
Cr'
Ni'
Ph'
Sh
TV
mg/1
mg/I
mg/I
mg/1
mg/1
mg/l
mg/I
mg/I
mg/1
mg/l
Benchmark
N/A(monitor only)
0.0003
0.34
0.065
0.003
0.9
0.335
0.075
0.09
NIA (monitor only)
002
<0.05
<0.0002
<0.005
0.00101
<0.001
0.0602
0.0301
0.0191
<0.005
<0.0002
006A
010
<0.05
0.0002
<0.001
<0.001
<0.001
0.00534
0.00259
0.00207
<0.001
<0.0002
Form SWU-247, last revised 21212012
Page I of 3

Footnotes.: Permit # NC5000580 [Part II Pa�.;e 7 of 35�
4. For each sampled measureable storm event, the total precipitation must be recorded. An on -site rain gauge
is required. Where isolated sites are unmanned for extended periods of time, a local rain gauge reading
may be substituted for an on -site reading.
S. These parameters shall be monitored only if coal or coal ash is transported through the drainage
areas of these outfalls during the semi-annual monitoring period in Table 2.
Footnotes: Permit # NCS000580 Part II Pa eY9 of 15
1. Hardness- dependent Benchmark based on translation of dissolved value into total recoverable with
an assumed hardness of 25 mg/l and a total suspended solids (TSS) concentration of 10 mg/I.
2. Values above the North Carolina water quality standard for mercury (12 ng/1) should be noted on the
DMR but do not trigger Tier responses. Concentrations infield blanks or method blanks associated
with the sample may be subtracted from the results far that sample, as long as all documentation of the
adjustment is provided with the DMR.
3. If pH values outside this range are recorded in sampled stormwater discharges, but ambient
precipitation pH levels are lower, then the lower threshold of this benchmark range is the pH of the
precipitation (within instrument accuracy) instead of 6 S.U. Readings from an on -site or local rain
gauge (or local precipitation data) must be documented to demonstrate background concentrations
were below the benchmark pH range of 6- 9.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month? _yes _X_no
(if yes, complete Part B)
Part B: Vehicle Maintenance Activity Monitoring Requirements
Outfall
No.
Date
Sample
Collected
50050
00556
00530
00400
Total Flow
(if applicable)
Total
Rainfall
Oil & Grease
(if appl.)
Non -polar -
O&G/TPH
(Method 1664
SGT-HEM), if
appl.
Total
Suspended
Solids
pH
New Motor
Oil Usage
moldd/ r
MG
inches
m
m
unit
gallmo
Form SWU-247. last revised 21212012
Page 2 of 3

Comments: Footnote 2: Permit # NCS000580 (Part It Page 9 of 15)
• Only visual inspection was required for 006A.
+ Mercury value for outfall 002on 06/18/19 was 69.9 ng/I which is over the North Carolina water quality standard for Mercury of 12 ng/1.
+ Mercury value for outfall 010 on 06/18/19 was 21.0 ng/I which is over the North Carolina water quality standard for Mercury of 12 ng/l.
• Revision made to permit to include new 002. Permit was amended and signed on 3/21/19.
STORM EVENT CHARACTERISTICS:
Date _06/18/2019-06/19/2019
Total Event Precipitation (inches): 1.89
Event Duration (hours): ____I5, (only if applicable — see permit.)
(if more than one storm event was sampled)
Date
Total Event Precipitation (inches):
Event Duration (hours): (only if applicable — see permit.)
,'Flail Original and one copy to:
Division of Water Quality
Attn: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a
system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the
best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
a -) I& q
(Date)
Form SWU-247. last revised 21212012
Page 3 of 3

DUKE
ENERGY®
PROGRESS
File: Mayo 12520-R July 25, 2019
NC Department of Environmental Quality
Division of Water Quality
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Mayo Steam Plant
Duke Energy Progress
10660 Boston Road
Roxboro, NC 27574
Subject: 15A N. C. Admin. Code 2I3 .0506
Mayo Electric Generating Plant
National Pollutant Discharge Elimination System Stormwater Permit NCS000580
Stormwater Discharge Outfalls 002, 006A and 010 Monitoring Report
Dear Sir or Madam:
In accordance with Part II1. Section E2 of NPDES Stormwater Permit Number NCS000580, enclosed is
the year 3, period 2, 2019 Stormwater Discharge monitoring report for Outfalls 002, 006A and 010 for
Duke Energy Progress, LLC. - NPDES Stormwater Permit Number NCS000580.
1 certify, widerpetialty of law, that this document curd all attachments were prepared rrirder my direction or
supen'isiort in accordance with a system designed to assure that qualified personnel properly gather and evaluate
the information submitted. Based on mr inquire of the person or persons who manage the system, or those persons
directly responsible forgathering the infornration, the information submitted is, to the hest of mrt' knowledge and
belief, true, accurate, and complete. f am airare that there are significant penalties for submitting false irlfornrcrtion,
including the possibility of fines and imprisonment for knowing violations.
Please contact Ms. Lori Tollie at [phone] if there are any questions concerning the data in this
submittal.
Enclosures
LPW/lpw
t
Sincerely,
Tom Copolo- Manager
Mayo Electric Generating Plant

File: Mayo 12520-R July 25, 2019
N Deptrtment of Environmental Quality
Division f Water Quality
A EN ION: Central Files
16 7 Mail Service Center
Ra eigh, North Carolina 27699-1617
Subject: 15A N. C. Admin. Code 2B .0506
Mayo Electric Generating Plant
National Pollutant Discharge Elimination System (NPDES) Number NC0038377
Discharge Monitoring Report (DMR)
cc: Ms. Lori Tollie (w/enclosures)
Ms. Keeley McCormick (wlenclosures)
Ms. Tina Woodward (wlenclosures)
Lab

STORMWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number: NCS000580
FACILITY NAME Mayo Electric Steam Plant
PERSON COLLECTING SAi41PLE(S) ,Joseph Heath Slade
CERTIFIED LABORATORY(S) Duke, Shealv Lab# 248 & 329
_Mayo Plant Lah Lab #_5064_
Part A. Specific Monitoring Requirements
SAMPLES COLLECTED DURING CALENDAR YEAR: 2019
(This monitoring report shall be received by the Division no later than 30 days from
the date the facility receives the sampling results from the laboratory.)
COUNTY Person
PHONE NO. [phone]
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 3.
Outfall
No.
Date
Sample Collected
00400
39516
01119
. 00981
71901
01092
00530
Tow
Rainfall'
pH`
PCBs
Copped
Total
Selenium
Total
Mercury=
Total
Zinc`
Total
TSS
Non -Polar
Oil & Grease
mo/dd/vr
inches
Standard
ggil
m■
m
m
m
mg/l
m
Benchmark
6-9
Detected
0.010
0.056
N/A'`
0.126
100
15
002
06/18/19@ 19:30
1.89
7.05
ND <0.40
0.0568
0.00117
0.0000699
0.137
1300
ND<5
006A
06/18/19@18:05
1.89
See Comment
010
06/18/19@17.45
1.89
6.18
0.1111511
<o.0U1
0.000021
0.016
89
ND<5
Outfall -
Additional Priority Pollutant Metals{
00999
01079
00978
00998
01113
01118
01074
01114
01268
00982
No.
Boron'
Ag'
As
Be
Cd'
Cr'
Nil
Phl.
Sb
TV
mg/l
mg/l
mg/1
mg/l
mgfl
mg/I
mg/l
mg/l
mg/l
mg/i
Benchmark
N/A(monitor only)
0.0003
0.34
0.065
0.003
0.9
0.335
0.075
0.09
N/A (monitor only)
002
<0.05
<0.0002
<0.005
0.00101
<0.001
0.0602
0.0301
0.0191
<0.005
<0.0002
006A
010
<0.05
<0.0002
<0.001
<0.00I
<0.001
0.00534
1 0.00259
0.00207
<01.0111
<0.0002
0
Form SWU-247, Iasi revised 212/Z012
Pw�e I of 3

footncitcs::Permi[4JM' S0005S 6(Paroi_LParc 7Zo 71 j
4. For each sampled measureable storm event, the total precipitation must he recorded. An on -site rain gauge
is required. Where isolated sites are unmanned for extended periods of time, a local rain gauge reading
may be substituted for an on -site reading.
S. These parameters shall be monitored only if coal or coal ash is transported through the drainage
areas of these outfalls during the semi-annual monitoring period in Table 2.
FootnoW.;JF;r rmi`t:#'NCS00059-6 Pah"Ii' age of 15�j
1. Hardness- dependent. Benchmark based on translation of dissolved value into total recoverable with
an assumed hardness of 2S mg/I and a total suspended solids (TSS) concentration of 10 mg/l.
2. Values above the [forth Carolina water quality standard for mercury (12 ng/1) should be noted on the
DMR but do not trigger Tier responses. Concentrations infield blanks or method blanks associated
with the sample may be subtracted from the results for that sample, as long as all documentation of the
adjustment is provided with the DMR.
3. If pH values outside this range are recorded in sampled stormwater discharges, but ambient
precipitation pH levels are lower, then the lower threshold'of this benchmark range is the pH of the
precipitation (within instrument accuracy) instead of 6 S.U. Readings from an on -site or local rain
gauge (or local precipitation data) must be documented to demonstrate background concentrations
were below the benchmark pH range of 6- 9.
Does this facility perform Vehicle Maintenance Activities using more than 55 gallons of new motor oil per month'? _yes _X_no
(if yes, complete Part B)
Part B: Vehicle Maintenance Activitv Monitorine Reauirements
Outfall
`
• - - •-
-Date,
'Sample:
;.Clet
- -
•50054?'
00556'
k011530
00400'
.TotalFlow
i
'•
;Total
'
Rainfal
L;
a -
-
Qil&Grease
r(if appl:)=
, - - y,'•SGT=H)Ek'I);,if•
No -polar"
.Q&C/TPH,
(Method:.1664=
a l:
Total
Suspended:";oe'
.Solids:
..
pl1
".
. -
New•Motor•No..
.
—
�mo/dd/ • )r
CMG -
finches' -
, m
m
unit'
aUmo' .
Form SWU-247, last revised 21212012
Page 2 of 3

Comments: Footnote 2: Permit # NCS000580 (Part I1 Page 9 of 1-)
• Only Visual inspection was required Im 006A.
• Mercury value for outfall 002on 06/18/19 was 69.9 ngll which is over the North Carolina water quality standard for Mercury of 1.2 ng/l.
• Mercury value for outfal] 010 on 06/18/19 was 2l.0 n,�/1 which is over the North Carolina water quality standard for Mercury of 12 ng/l.
• Revision made to Permit to include new 002, Permit was amended and si+oned on 3/11119. i
STORM EVENT CHARACTERISTICS: Mail Original and one copy to:
Division oI' Water Quality
Date 06/18/2019-06/19/2019 Attn: Central Files
Total Event Precipitation (inches): I.89 1617 Mail Service Center
Event Duration (hours): _15__ (only ifapplicable — sec permit.) Raleigh, North Carolina 27699-1617
(if more than one storm event was sampled)
Date
Total Event Precipitation (inches):
Event Duration (hours): (only if applicable — see permit,)
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a
system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person
or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the
best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations."
(Signature of P tee) (Date)
Form SWU-247, Iasi revised 21212012
Page 3 of 3