NCS000580_MONITORING INFO_20200128

ICU
STORMWATER DIVISION CODING SHEET
NCS PERMITS
PERMIT NO.
n I L 5 V �( v
I"
DOC TYPE
❑FINAL PERMIT
�k MONITORING REPORTS
❑ APPLICATION
❑ COMPLIANCE
❑ OTHER
DOC DATE
❑ �L� �% L� � � v
YYYYMMDD

DUKEMayo
Steam Plant
ENERGY,
PROGRESS
Duke Energy Progress
10660 Boston Road
Roxboro, NC 27574
File: Mayo 12520-R January 20, 2020
NC Department of Environmental Quality RECEIVED
Division of Water Quality f QN 2 $ 2420
ATTENTION: Central Files
1617 Mail Service Center CEN I NAL FILES)
Raleigh, North Carolina 27699-1617 DWR SE ;TlpN
Subject: 15A N. C. Admin. Code 213 .0506
Mayo Electric Generating Plant
National Pollutant Discharge Elimination System Stormwater Permit NCS000580
Stormwater Discharge Outfalls 002 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, December 2019 Stormwater Discharge monitoring report for Outfalls 002 and 010 for Duke
Energy Progress, LLC. - NPDES Stormwater Permit Number NCS000580. To note, OUtfidIS 002 and 010
are in tiered status.
I certify, under penalrY of law, that this document wid all attachments were prepared under m ' y direction or
supervision in accordance with a s,1'stem designed to assure that qualified personnel properlsy garher and ei,aluate
the information subnritled. Based on my inquiry of the person or persons who manage the system, or rhose persons
directh° responsible fur gathering the information, the information submitted is, to the best of nu}y knowledge and
belief; true, accurate, and complete. I a m aware that there are significant penalties for submitting folse information,
including the possibility q fines and imprisonment fur knowing rlolations.
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
Enclosures
LPW/Ipw

Semi-annual Stormwater Discharge Monitoring Report
for -North Carolina Division of Water _Quality General Permit No. NCG120000
Date submitted fir✓ yoga
CERTIFICATE OF COVERAGE NO. NCG120101
FACILITY NAME Mayo Steam Plant Monofill
COUNTY Person ^
PERSON COLLECTING SAMPLES Heath Slade
LABORATORY Duke. Shealy, Mayo Lab Lab Cert. # Duke: 248, Shealy:
329, Mayo: 5064 Comments.on sample collection or analysis:_COC:,
does not require fecal sampling.
Part A: Stormwater Benchmarks and Monitoring Results
SAMPLE COLLECTION YEAR 2019
SAMPLE PERIOD ❑ 1an-June ® July -Dec
or ❑ Monthly) month
DISCHARGING TO CLASS ❑ORW ❑HQW []Trout ❑PNA
❑Zero -flow ❑Water Supply ❑SA
® Other Bowes Branch Class C
PLEASE REMEMBER TO SIGN ON THE REVERSE 4
❑ No discharge this period?Z
Outfall No.
Date Sample
a Collected)
,(mo/dd/yr)
24-hour rainfall
amount,
Inches;
Chemical Oxygen Demand
Fecal Coliform
Total Suspended Solids
P
Benchmarks =__> ,
_
-
120 mg/L
1000 count per 100 mL
100 mg/L
001
002
12/17/19 @ 11:05
0.25
ND <20.0
See comment
9.5
003
1 Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
Z For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
3The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
4 See General Permit text, Table 3, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example, do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -
numerical format. When results are below the applicable limits, they must be reported in the format "<XX mg/L", where XX is the numerical value of the
detection limit, reporting limit, etc. in mg/L. Conversely, where fecal coliform results exceed the dilution upper limit, report the result as ">XX".
Note: if you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See Genera! Permit text.
Permit Date: 11/1/2018-05/31/2021 SWU-248, last revised 10/25/2012
Page 1 of 5

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Water Quality General__Permit No. NCG120000
Date submitted
CERTIFICATE OF COVERAGE NO. NCG120101 SAMPLE COLLECTION YEAR 2019
FACILITY NAME Mayo Steam Plant Monofill SAMPLE PERIOD ❑ Jan -June ® July -Dec
COUNTY Person i or ❑ Monthly) (month)
PERSON COLLECTING SAMPLES Heath Slade DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
LABORATORY Duke. Shealy, Mayo Lab Lab Cert. # Duke: 248 Shealy' ❑Zero -flow ❑Water Supply []SA
329, Mayo:_5064 Comments on sample collection or analysis: ® Other Bowes Branch Class C
Part A: Stormwater Benchmarks and Monitoring Results
PLEASE REMEMBER TO SIGN ON THE REVERSE 4
❑ No discharge this period?2
Outfall No.
Date Sample
Collected)
(mo/ddlYrl
24-hour rainfall
amount,
Inches3
Arsenic
Selenium
Boron
Benchmarks =__>
i _
-
mg/L
mg/L
mg/L
001
002
12/17/19 @ 11:05
0.25
<0.001 6
<0.001
<0.05 '
003
a Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
z For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
3The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
4 See General Permit text, Table 3, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example, do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -
numerical format. When results are below the applicable limits, they must be reported in the format, "<XX mg/L", where XX is the numerical value of the
detection limit, reporting limit, etc. in mg/L. Conversely, where fecal coliform results exceed the dilution upper limit, report the result as ">XX".
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Permit Date: 11/1/2018-05/31/2021' SWU-248, last revised 10/25/2012
Page 2 of 5

Semi-annual Stormwater Discharge Monitoring Report
forlNorth Carolina Division of Water Quality General Permit No. NCG120000
Date submitted
I
CERTIFICATE OF COVERAGE NO. NCG120101
FACILITY NAME Mayo Steam Plarit Monofill
COUNTY Person
PERSON COLLECTING SAMPLES Heath Slade
L LABORATORY Duke, Shealy, Mayo Lab Lab Cert. ## Duke: 248, Shealy:
329, Mayo: 5064 Comments on'sample collection or analysis:
i
Part A: Stormwater Benchmarks and Monitoring Results
SAMPLE COLLECTION YEAR 2019
SAMPLE PERIOD ❑ Jan -June ® July -Dec
or ❑ Monthly' (month)
DISCHARGING TO CLASS ❑ORW ❑HQW [-]Trout ❑PNA
❑Zero -flow ❑Water Supply [:]SA
® Other Bowes Branch Class C
PLEASE REMEMBERJO SIGN ON THE REVERSE 4
❑ No discharge this period?'
Outfall No.
Date Sample
( Collected'
i(mo/dd/yr)
24-hour rainfall
amount,
Inches
pH
Conductivity
Benchmarks =__>
-
-
S.U.
S/m
001
t
i
002
12/17/19 @ 11:05
0.25
7.40 a
0.00629 f
003
i
i
i
i
i
e
' Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
Z For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
3The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
"See General Permit text, Table 31 identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
i
Note: Results must be reported in numerical format. For example, do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -
numerical format. When results are below the applicable limits, they must be reported in the format, "<XX mg/L", where XX is the numerical value of the
detection limit; reporting limit, etc. in mg/L. Conversely, where fecal coliform results exceed the dilution upper limit, report the result as '`>xx".
Permit Date: 11/1/2018-05/31/2021 ; SWU-248, last revised 10/25/2012
Page 3 of 5

Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
i
i Semi-annual Stormwater Discharge Monitoring Report
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Part B: Vehicle Maintenance Area Monitoring Results: only for facilities averaging > 55 gal of new oil per month.
,
❑ No discharge this period?2
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches'
Non -polar O&G/TPH by
EPA 1664 (SGT-HEM)
Total Suspended Solids
pH
Benchmarks ==_>
_
-
15 mg/L
100 mg/L or 50 mg/L°
6.0 — 9.0 SU
{
a
I
Footnotes from Part A also apply {to this Part B
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
i
4
FOR PART A AND PART B MONITORING RESULTS:
• A BENCHMARK EXCEEDANCE TRIGGERS TIER 1 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• 2 EXCEEDANCES IN A ROW FOR THE SAME PARAMETER AT THE SAME OUTFALL TRIGGER TIER 2 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• TIER 3: HAS YOUR FACILITYIHAD 4 OR MORE BENCHMARK EXCEEDENCES FOR THE SAME PARAMETER AT ANYONE OUTFALL? YES ❑ NO
IF YES, HAVE YOU CONTACTED THE DWQ REGIONAL OFFICE? YES ❑ NO ❑
REGIONAL OFFICE CONTACT NAME: I
Mail an original and one copy of this DMR, includinq all "No Discharqe" reports, within 30 days of receipt of the lab results (or at end of monitoring period
in the case of "No Discharge" reports) to:
Division of Water Quality i
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617 1
fi
Permit Date: 11/1/2018-05/31/2021 E
SWU-248, last revised 10/25/2012
Page 4 of 5

Comment:
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 Permittee)
1
1
i
I
I
01110a-a
(Date)
Permit Date
11/1/2018-05/31/2021
t
SWU-248, last revised 10/25/2012
Page 5 of 5

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
January 20, 2020
Mayo Steam Plant
Duke Energy Progress
10660 Boston Road
Roxboro, NC 27574
Subject: 15A N. C. Admin. Code 213.0506
Mavo Electric Generating Plant
National Pollutant Discharge Elimination System Stormwatcr Permit NCS000580
Stormwater Discharge Outfalls 002 and 010 Monitoring Report
Dear Sir or Madam:
In accordance with Part III. Section E2 of NPI)ES Stormwater Permit Number NCS000580, enclosed is
the year 3, December 2019 Stormwater Discharge monitoring report for Outfalls 002 and 010 for Duke
Energy Progress, LLC. - NI UES Stormwater Permit Number NCS000580. To note, Outfalls 002 and 010
are in tiered status,
l c•ertifti', tuuler penaltX. of•law, that this docament and all attachnrews were prepared under mY direction or
sriperr•isiorr in ac•crrrdanc:e with a system designed to assicre that qualified personnel propedJ•gather-and evaluate
tha infor-rnation Submitted, Based on mY inquir-r of the person or parsons who manage the system, or those persons
direct!)' raspeuts'ible for gcrthc ring the irrforrrtatiotr, the infi)rntcrtion srthmitted is, to the hest of ins• knowlet,ge and
belie , true, accurate, and complete. 1 am awao, that there are significant penallies for snhntitting false ill )rrrtcrtiorr,
including the possihilitY of fines and imprisonment for knowing violations.
Please contact iv1s. Lori Tollic at [phone] iF there arc any questions concerning the data in this
Submittal.
Sincerely.
Tom Copolo- Manager
Mayo Electric Generating Plant
Enclosures
LPWIIp,A'

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Water Quality General Permit No. NCG120000
Date submitted ( j !)0 /a 0_:Z0
CERTIFICATE OF COVERAGE NO. NCG120101
FACILITY NAME Mayo Steam Plant Monofill
COUNTY Person
PERSON COLLECTING SAMPLES Heath Slade
LABORATORY Duke, Shealy. Mayo Lab Lab Cert. # Duke: 248, Shealy:
329, Mayo: 5064 Comments on sample collection or analysis: COC:
does not require fecal sampling.
Part A: Stormwater Benchmarks and Monitoring Results
SAMPLE COLLECTION YEAR 2019
SAMPLE PERIOD ❑ Jan -June ® July -Dec
or ❑ Monthly' month
DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
❑Zero -flow [:]WaterSupply ❑SA
® Other Bowes Branch Class C
PLEASE REMEMBER TO SIGN ON THE REVERSE -->
❑ No discharge this period?z
Outfall No.
Date Sample
Collected)
(ma/dd/yrj
24-hour rainfall
amount,
Inches3
Chemical Oxygen Demand
yg
Fecal Coliform
Total Suspended Solids
P
Benchmarks =__>
_
-
120 mg/L
1000 count per 100 mL
100 mg/L
001
002
12/17/19 @ 11:05
0.25
ND <20.0
See Comment
9.5
003
1 Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
z For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
'The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
4 See General Permit text, Table 3, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example, do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -
numerical format. When results are below the applicable limits, they must be reported in the format, "<XX mg/L", where XX is the numerical value of the
detection limit, reporting limit, etc. in mg/L. Conversely, where fecal coliform results exceed the dilution upper limit, report the result as ">XX".
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Permit Date: 11/1/2018-05/31/2021 SWU-248, last revised 10/25/2012
Page 1 of 5

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Water Quality General Permit No. NCG120000
Date submitted
CERTIFICATE OF COVERAGE NO. NCG120101
FACILITY NAME Mayo Steam Plant Monufill _
COUNTY Person
PERSON COLLECTING SAMPLES Heath Slade
LABORATORY Duke —Shealy, Mayo Lab Lab Cert. # Duke: 248, Shealy:
329, Mayo: 5064 Comments on sample collection or analysis:
Part A: Stormwater Benchmarks and Monitoring Results
SAMPLE COLLECTION YEAR 2019
SAMPLE PERIOD ❑ Jan -June ® July -Dec
or ❑ Monthly' (month)
DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
❑Zero -flow ❑Water Supply []SA
® Other Bowes Branch Class C
PLEASE REMEMBER TO SIGN ON THE REVERSE 4
❑ No discharge this period?'
Clutfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
inches'
Arsenic
Selenium
Boron
Benchmarks =__>
-
-
mg/L
mg/L
mg/L
001
002
12/17/19 @ 11:05
0.25
<0.001 0
<0.001
<0.05 '
003
1 Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
z For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
'The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
k See General Permit text, Table 3, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example, do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -
numerical format. When results are below the applicable limits, they must be reported in the format, "<XX mg/L", where XX is the numerical value of the
detection limit, reporting limit, etc. in mg/L. Conversely, where fecal coliform results exceed the dilution upper limit, report the result as ">XX".
1dote: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Permit Date: 11/1/2018-05/31/2021 SWU-248, last revised 10/25/2012
Page 2 of 5

Semi-annual Stormwater Discharge Monitoring Report
for -North Carolina Division of Water Quality General Permit No. NCG120000
Date submitted
CERTIFICATE OF COVERAGE NO. NCG120101 SAMPLE COLLECTION YEAR 2019
FACILITY NAME Mayo Steam Plant Monofill SAMPLE PERIOD ❑ Jan -June ® July -Dec
COUNTY Person or ❑ Monthly' [month)
PERSON COLLECTING SAMPLES Heath Slade DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
L LABORATORY Duke, Shealy, Mayo Lab Lab Cert. # Duke: 248 Shealy.. ❑Zero -flow ❑Water Supply []SA
329, Mayo: 5064 Comments on sample collection or analysis: ® Other Bowes Branch Class C
Part A: Stormwater Benchmarks and Monitoring Results
PLEASE REMEMBER TO SIGN ON THE REVERSE 4
❑ No discharge this period?z
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches;
pH
Conductivity
Benchmarks
S.U.
S/m
001
002
12/17/19 @ 11:05
0.25
7.40
0.00629 +
003
1 Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
z For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
'The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites may be eligible for a waiver of the rain gauge requirement.
"See General Permit text, Table 3, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example, do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -
numerical format. When results are below the applicable limits, they must be reported in the format, "<XX mg/L", where XX is the numerical value of the
detection limit, reporting limit, etc. in mg/L. Conversely, where fecal coliform results exceed the dilution upper limit, report the result as ">XX".
Permit Date: 11/1/2018-05/31/2021 SWU-248, last revised 10/25/2012
Page 3 of 5

Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Semi-annual Stormwater Discharge Monitoring Report
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Part B: Vehicle Maintenance Area Monitoring Results: only for facilities averaging > 55 gal of new oil per month.
❑ No discharge this period ?2
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches3
Non -polar O&G/TPH by
EPA 1664 SGT HEM
{ )
Total Suspended Solids
pH
Benchmarks ===>
_
-
15 mg/L
100 mg/L or 50 mg/L°
6.0 — 9.0 SU
Footnotes from Part A also apply,to this Part B
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
FOR PART A AND PART B MONITORING RESULTS:
• A BENCHMARK EXCEEDANCE TRIGGERS TIER 1 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• 2 EXCEEDANCES IN A ROW FOR THE SAME PARAMETER AT THE SAME OUTFALL TRIGGER TIER 2 REQUIREMENTS. SEE PERMIT PART 11 SECTION B.
• TIER 3: HAS YOUR FACILITYHAD 4 OR MORE BENCHMARK EXCEEDENCES FOR THE SAME PARAMETER AT ANY ONE OUTFALL? YES ❑ NO
IF YES, HAVE YOU CONTACTED THE DWQ REGIONAL OFFICE? YES ❑ NO ❑
REGIONAL OFFICE CONTACT NAME:
Mail an original and one copy of this DMR, including all "No Discharge" reports, within 30 days of receipt of the lab results for at end of monitorina Period
in the case of "No Discharge" revortsl to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Permit Date: 11/1/2018-05/31/2021 SWU-248, last revised 10/25/2012
Page 4 of 5

Comment:
YOU MUST SIGN THIS CERTIFICATION FOR ANY INFORMATION REPORTED:
"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 Permittee)
1 &
(Date)
Permit Date: 11/1/2018-05/31/2021 SWU-248, last revised 10/25/2012
Page 5 of 5