NCG120101_MONITORING INFO_20200128

ZIz 0
STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO.
v
DOC TYPE
❑ HISTORICAL FILE
MONITORING REPORTS
DOC DATE
❑ coyojJs
YYYYMMDD

it
DUKE
ENERGY®
PROGRESS
File: Mayo 12520-R
Maya Steam Plant
Duke Energy Progress
10660 Boston Road
Roxboro, NC 27574
NC Division of Water Resources January 20, 2020
ATTENTION: Central Files
1617M ail Service Center
Ralei h, North Carolina 27699-1617
JAN2g2020
Subject: 15A N. C. Admin. Code 2B .0506C-EN'Ti: ,,
Mayo Electric Generating PlantDw-i P11_FS
National Pollutant Discharge Elimination Systcma(NPDES) Number NCG 120101
Monofill Stormwater Discharge Outfall Monitoring Report
Dear Sir or Madam:
Please find enclosed the July through December, 2019 Mayo Monofill Stormwater Discharge Monitoring
Report, with comments, for Permit Number NCG120101, SDO 002, for Duke Energy Progress, LLC, The
Mayo Electric Generating Plant Monofill became operational November 7, 2014.
1 certify, nnler penalty of l(w, that this document and all attachments vrere prepared under- my direction or
supervision in accordance tt,ith a sys7em designed to assure that qualified personnel properly gather and evaluate
the inf )onation submitted. Based art my inquiry of the person or persons who manage the system, or- those persons
directly responsible fur gathering the information, the information submitted is, to the hest of myknowledge rnrd
belief, tare, accurate, and complete. 1 am a�t,are that there are significant penalties for.rubmitting f dse infrrrmation,
including the possibilitY of fines and imprisonmentfor knotiring violations.
Please contact Ms. Lori Tollie at [phone], if there are any questions concerning the data in this
submittal.
Enclosures
Sincerely,
Tom Copolo - Manager
Mayo Electric Generating Plant

' ! STORMWATER DISCHARGE OUTFALL (SDO)
yMONITORING REPORT
i
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 laboratoy.)r
FACILITY NAME Mayo Electric Steam Plant
PERSON COLLECTING SAiMPLE(S) Heath Slade PHONE NO.
CERTIFIED LABORATORY(S) Duke, Shealy Lab# 248 & 329
I _Mayo Plant Lab Lab #_5064_
i .
Part A: Specific Monitoring Requir
1 ements
COUNTY Person
[phone]
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 3.
Outfall
No. 1
Date
.Sample: Collected
1
t10400
39516
fl1119
00981
71901
01092
00530
Total
Rainfall
PH-"
PCBs
Copper'
Total
Selenium
Total
Mercury'
Total
Zinc'
Total
TSS
'Non -Polar
Oil &Grease
mo/dd/ r
P% inches
Standard
RgA
m
m
m
m
m
m
Benchmark
6-9
Detected
0.010
0.056
N/A'
0.126
100
15
002
No Flow
t
010
12/17/19 @ 11:45
0.25
6.14
Not Tested
0.00253
<0.001
7.85
0.010
<2.5
ND <5.0
Outfall
Additional Priority Pollutant Metals;
00999
01079
-00978
00998
01113
01118
01074
01114
01268
00982
No.
Boron'
!Ag'
As
Be
Cd'
Cr'
Ni'
Pb'
Sb
TV
0.00000
mg/l
mg/1
mg/l
mgll
mg/l
mg/l
mgll
mg/1
mgll
mg/1
Benchmark
N/A(monitor only)
0.0003
0.34
0.065
0.003
0.9
0.335
0.075
0.09
NIA (monitor only)
i
I
002
I
010
<0.05
<0.0002
<0.001
<0.001
<0.001
0.0017
0.00119
<0.001
<0.001
<0.0002
Form SWU-247, last revised 2212012
i Page 1 of 3

Footnotes: Permit # NCS000586 �Part Ii'Pa2e 7 of_l5)
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.
r
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.
s
Footnotes: Permit # NCS000580 (. Part I1 Page 9 of 15 )
I
1. Hardness- dependent. Benchmark based on translation of dissolved value into total recoverable with
an assumed hardness of 25 mg/I and a total suspended solids (TSS) concentration of 10 mg/l.
t
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 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) r'rtust 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 Re[Lirements
Outfall
Date
50050
00556
00530
00400
No.
Sample,'
Total Flow
Total .
Oil & Grease
Non -polar •
Total
pH
New Motor
Collected
(if.applicable)
Rainfall
(if appl.)
O&G/TPH
Suspended
Oil Usage
�i
(Method 1.664 '
Solids
t
,t
SGT-HEM), if
(
('
appl.
ono/dd/ yr
MG
inches
m
m
unit
al/mo
{
r
I
Form SWU-247, last revised 21212012
Page 2 of 3

Comments:
• Outfall 010: Tier One
• Outfall 002: Tier Two
STORM EVENT CHARACTERISTICS:
I
Date:12117119 i
Total Event Precipitation (inches):0.25
Event Duration (hours): S hours 40 minutes (only if applicable - see permit.)
k
(if more than one storm event was sampled)
i
Date
Total Event Precipitation (inches):
Event Duration (hours): 1 (only if applicable - see permit.)
s
a
,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."
r, /-1 0
(Sig
0,164lot C.
(Date)
Form SWU-247, last revised 21212012
Page 3 of 3

Form SWU-247, lust revised 21212012
Pate 4 of 3

DUKE
ENERGY.
PROGRESS
File: Nlavo 12520-R
NC Division of Water Resources
ATTENT1W Central Files
1617 Mail Service Center
Raleigh. North Carolina 27699-1617
January 20, 2020
Mayo Steam Plant
Duke Energy Progress
10660 Boston Road
Roxbo(o, NC 27574
Subject: 15A N. C. Admin. Code 213.0506
Mayo Electric Generating Plant
National Pollutant Discharge Elimination System (NPDES) Numher NCG 120101
Monofill Stormwater Discharge Outfall Monitoring Report
Dear Sir or Madam:
Please find enclosed the July through December, 2019 Mayo Monofill Stormwater Discharge Monitoring
Report, with comments, for Permit Numher NCG120101, SDO 002. for Duke Energy Progress, LI-C. The
Mayo Electric Generating Plant Monofill became operational November 7, 2014.
1 certif ' urrderpenalty of'law, that this document and till attachments were prepared under-nry direction or
silper-vision in accordance with a system designed to assure that quctlifiecl personnel properly gather arrd evahuac
the information submitted. Based on my inguirti• of the person or persons who manage the system, or those persons
directly responsible forgathering the information, the itiformcttion submitted is, to the best of urr knowledge and
belief tare, accurate, and complete. I am aware their !here are signific.'am penalties for submining false irr formation,
irichuling the possibility of fines and imprisonment for knowing violations.
Please contact Ms. Lori "Collie at [phone], if there are any questions concerning the data in this
submittal.
Sincerely,
Tom Copolo - Manager
Mayo Electric Generating Plant
Enclosures

STORN-IWATER DISCHARGE OUTFALL (SDO)
MONITORING REPORT
Permit Number: NCS000580 SAIMPLES 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 COUNTY Person
PERSON COLLECTING SANIPLE(S) Heath Slade PHONE NO. [phone]
CERTIFIED LABORATORY(S) Duke, Shealv Lab# 248 & 329
Nlavo Plant Lab Lab # 5064
SIGNATURE OF PERMITTEE OR DESIGNEE
REQUIRED ON PAGE 3.
Part A: Specific Monitoring Requirements
Outfall
No.
Date
Sample Collected
410400
39516
01119
00981
71901
01092
00530
Total
} Rainfal14
i
pH
PCBs
Copper'
Total
Selenium
Total
Mercury'
Total
Zinc'
Total
TSS
Non -Polar
Oil & Grease
mo/dd/ r
inches
Standard
mo
mo
m
m
m
m
Benchmark
6-9
Detected
0.010
0.056
NIA'-
0.126
100
l5
002
No Flow
010
12/17/19 @ 11:45
0.25
6.14
Not Tested
0.00253
<11.001
7.85
O.Olo
<2.5
ND <5.0
Outfall
Additional Priority Pollutant Metals{
00999
01079
00978
00998
01113
(11118
01074
01114
01268
00982
No.
Boron
Ag'
As
Be
Cd'
Cr'
NO
Pb'
Sb
TI'
0.00000
mg/1
; mg/l
mg/I
mg/I
mg/I
mg/I
mg/I
mg/l
mg/1
mg/I.
Benchmark
NIA(monitor only)
0.0003
0.34
0.065
0.003
0.9
0.335
1 0.075
0.09
NIA (monitor only)
002
010
<0.05
<0.0002
<0.001
<0.001
<0.001
0.0017
0.00119
<0.001
<0.001
<0.0002
Donn SWU-217, hest revised 2212012
Pace I cal, 3

Footnotes: Permit # NCS000580 Part Il Paee 7 of 15
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 If Page 9 of 15 )
1. Hardness- dependent. Benchmark based on translation of dissolved value into total recoverable with
an assumed hardness of 25 mg/I and a total suspended solids (TSS) concentration of 10 mg/l.
2. Values above the North Carolina water quality standard for mercury (12 ng/l) should be noted on the
DM R 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 iTallons of new motor oil per month? _ yes _X_no
(if yes. complete Part B)
Part B: Vehicle iNlaintenance Activity Monitoring Requirements
Outfall
No.
Date
Sample
Collected
_
50050
00556
00530
00400
Total Flow
(iflapplicable)
F
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
mo/dd/ yr
MG
inches
mgA
m /l
unit
al/mo
Form SWU-247, last revised 2/2/2012
Paee 2 ol' 3

Conlnlents:
• Outfall 010: Tier One
• Outfall I102: Tier Two
STORM EVENT CHARACTFRISTICS:
Date:12/17/19
Total Event Precipitation (inches):0.25
Event Duration (hours): 8 hours dU minutes (only il' applicable — see permit.)
(if more than one storm event NA'as san)ple(l)
Date
Total Event Precipitation (inches):
Event Duration (hours): (only i l' applicable — sec permit.)
Nlail Original and one copy to:
Division of Water Quality
Aim: Central Files
1617 Mail Service Center,
Raleigh, North Carolina 27699-1617
"I certify, under penal", 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
hest 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
(Date)
Form SWU-247, last revised 212/2012
Page 3of 3