NCG120101_MONITORING INFO_20190731

ZZb
STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO.
DOC TYPE
❑ HISTORICAL FILE
MONITORING REPORTS
DOC DATE
❑ �e15073)
YYYYMMDD

J _b
STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO.
/VCG I a L12b
DOC TYPE
1❑..II HISTORICAL FILE
1� MONITORING REPORTS
DOC DATE
❑ aO 0
YYYYMMDD

WE
DUKE
ENERGY®
PROGRESS
File: Mayo 12520-R
Mayo Steam Plant
Duke Energy Progress
10660 Boston Road
Roxboro, NC 27574
NC Division of ater Resources July 5, 2019
ATTENTION: qentral Files
1617 Mail Servic Center
Raleigh, North C rolina 27699-1617
Subject: 15A N. C. Admin. Code 213.0506
Mayo Electric Generating Plant
National Pollutant Discharge Elimination System (NPDES) Number NCG 120101
Monofill Stonnwater Discharge Outfall Monitoring Report
Dear Sir or Madam:
Please find enclosed the January through July 2019 Mayo Monofill Stormwater Discharge Monitoring
Report, with comments, for Permit Number NCG120I0L SDO 001, SDO 002 & SDO 003, for Duke
Energy Progress, LLC. The Mayo Electric Generating Plant Monofill became operational November 7,
2014.
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 ant aware that there are significant penalties for submitting false information,
including the possibility of fines and intprisonment for knowing violations.
Please contact Mr. Lori Tollie at [phone], if there are any questions concerning the data in this
submittal.
Sincerely,
Tom Copolo - Manager
RECEIVE![)Mayo
Electric Generating Plant
JUL 31 2019
CEN I"RAL FILES
DWR SECTION
Enclosures

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Water Quality General Permit No. NCG120000
Date submitted n 1,Zl 119
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: CDC:
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 dischorge this period?z
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches'
Chemical Oxygen Demand
Fecal Coliform
Total Suspended Solids
Benchmarks =__>
-
-
120mg/L
1000 count per 100 mL
100 mg/L
001
06/18/19@18:50
1.89
20 mg/I
See Comment
110 mg/I
002
06/18/19@18:40
1.89
29 mg/I
See Comment
44 mg/I
003
06/18/19@18:25
1.89 -
< 20 mg/I
See Comment
150 mg/I
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 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
LABORATORY Duke. Shealy, Mayo Lab Lab Cert. # Duke: 248, Shealy: [_]zero -flow []Watersupply ❑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 -->
n No discharge this period ?2
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches;
Arsenic
Selenium
Boron
Benchmarks =__>
-
-
mg/L
mg/L
mg/L
001
06/18/19@18:50
1.89
< 0.001 mg/I
< 0.001 mg/I
0.140 mg/I
002
06/18/19@18:40
1.89
0.00103 mg/I
<0.001 mg/I
<0.05 mg/1
003
06/18/19@18:2S
1.89
0.00343 mg/I
<0.001 mg/I
<0.05 mg/1
Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
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
for North Carolina Division of Water Quality General Permit No. NCG120000
Date submitted
CERTIFICATE OF COVERAGE NO. NCG120101
FACILITY NAME Mayo Steam Plant 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:
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 4
n 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
06/18/19@18:50
1.89
6.21
0.00879
002
06/18/19@18:40
1.89
6.34
0.00546
003
06/18/19@18:25
1.89
6.65
0.00556
Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall:
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".
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,
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/L4
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 1, 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 II SECTION B.
• TIER 3: HAS YOUR FACILITY HAD 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 oriainal and one copy of this DMR, including all "No Discharae" 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
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

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
o7/aSIM
(Date)
Permit Date:11/1/2018-05/31/2021 5WU-248,last revised 10/25/2012
Page 5 of 5

DUKE
C ENERGY
PROGRESS
File: Mayo 12520-R
Mayo Steam Plant
Duke Energy Progress
10660 Boston Road
Roxboro, NC 27574
I I
NC ivision of ater Resources July 5, 2019
A ENTION: entral Files
161 Mail Set Center
Ral igh, North C rolina 27699-1617
Subject: 15A N. C. Admin. Code 2B .0506
Mayo Electric Generating Plant
National Pollutant Discharge Elimination System (NPDES) Number NCG120101
Monofill Stormwater Discharge Outfall Monitoring Report
Dear Sir or Madam:
Please find enclosed the January through July 2019 Mayo Monofill Stormwater Discharge Monitoring
Report, with comments, for Permit Number-NCG120101, SDO 001, SDO 002 & SDO 003, for Duke
Energy Progress, LLC. The Mayo Electric Generating Plant Monofill became operational November 7,
2014.
I certify, under penalty of law, that this domunent and all attachments were prepared under nq• direction or
supen•ision in accordance with a s}•stern designed to assume that qualified personnel properly gather and evaluate
the information submitted. Based on my ingnirc of the person or persons who manage the systent, or those persons
directly responsible for gathering the information, the information submitted is, to the best of air knowledge and
belief, true, accurate, and complete. I ant aware that there are significant penalties for submitting false information,
including the possibility of fines and imprisonment for knowing violations.
Please contact Mr. Lori Tollie at [phone], if there are any questions concerning the data in this
submittal.
Sincerely.,,
Tom Copolo - Manager
Mayo Electric Generating Plant
Enclosures

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Water Quality General Permit No. NCG120000
Date submitted 1 11�g llq
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: CDC:
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 —EJMQW ❑Trout ❑PNA
❑Zero -flow [:]WaterSupply ❑SA
® Other Bowes Branch Class C
PLEASE REMEMBER TO SIGN ON THE REVERSE 4
❑ No discharge this period?'
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches
Chemical Oxygen Demand
Fecal Coliform
Total Suspended Solids
Benchmarks =__>
-
-
120 mg/L
1000 count per. 100 mL
100 mg/L
001
06/18/19@18:50
1.89
20 mg/I
See Comment
110 mg/I
002
06/18/19@18:40
1.89
29 mg/I
See Comment
44 mg/1
003
06/18/19@18:25
1.89
< 20 mg/I
See Comment
150 mg/I
' 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".
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. NCG 120101 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?'
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches'
Arsenic
Selenium
Boron
Benchmarks ===>
_
-
mg/L
mg/L
mg/L
001
06/18/19@18:50
1.89
< 0.001 mg/I
< 0.001 mg/I
0.140 mg/I
002
06/18/19@18:40
1.89
0.00103 mg/I
< 0.001 mg/I
< 0.05 mg/I
003
06/18/19@18:25
1.89
0.00343 mg/I
< 0.001 mg/I
< 0.05 mg/I
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 c eTi crmark here.
3 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".
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
for North Carolina Division of Water Quality General Permit No. NCG120000
Date submitted
CERTIFICATE OF COVERAGE NO. NCG120101
FACILITY NAME Mayo Steam Plant 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:
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 Tn SIGN ON THE REVERSE-4
❑ No discharge this period?'
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches'
pH
Conductivity
Benchmarks===>
_
-
S.U.
S/m
001
06/18/19@18:50
1.89
6.21
0.00879
002
06/18/19@18:40
1.89
6.34
0.00546
003
06/18/19@18:25
1.89
6.65
0.00556
' Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outfall.
2 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 protec ive enchmark 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 me/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/L4
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 II SECTION B.
• TIER 3: HAS YOUR FACILITY HAD 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 Discharae" reports) to
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Permit Date: 11/1/2018-05731/2021 SWU-248, last revised 10/25/2012
Page 4 of 5

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 Perm
0705111
(Date)
Permit Date: 11/1/2018-05/31/2021 SWt 1-248, last revised 10/25/2012
Page 5 of 5