NCG120101_MONITORING INFO_20191204

STORMWATER DIVISION CODING SHEET
NCG PERMITS
PERMIT NO.
/u C
DOC TYPE
❑ HISTORICAL FILE
C)� MONITORING REPORTS
DOC DATE
❑ O % 7 %a
YYYYMMDD

(' DUKE
ENERGY®
PROGRESS
File: Mayo 12520-R
NC Division of Water Resources
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
DEC 0 y
CENTRAL FILt.
DWR SECTION
November 22, 2019
Mayo Steam Plant
Duke Energy Pro ress
10660 Boston Road
Roxboro, NC 27574
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 July through December 2019 Mayo Monofill Stornwater Discharge Monitoring
Report, with comments, for Permit Number NCG120101, SDO 001 & SDO 003, for Duke Energy
Progress, LLC. SDO 002 did not Flow during rain event and will be sent at a later date depending on
qualifying event. The Mayo Electric Generating Plant Monofill became operational November 7, 2014.
I certify, underpenalty of law, that this document and all attachments were prepared under my direction w
supervision in accordance with a system designed to assure that qualified personnel properly, gather and evaluate
the information submitted. Based on np' inquiry of the person or persons who manage the system, or those persons
directly, responsible for gathering the information, the info nation submitted is, to the best of my knowledge and
belief, true, accurate, and complete. d anh aware that there are significant penalties for submitting fi lse information,
including the possibility, offiner and imprisonment forknowing violations.
Please contact Mr. Lori Tollie at [phone], if there are any questions concerning the data in this
submittal.
Enclosures
Sincerely,
Tom Copolo - Manager
Mayo Electric Generating Plant
RECEIVED
DEC 0 4 2019
CENTR/-NL FILES
pNIR S1CTION

-Semi-annual-Stormi ater Dischari;e Mdriitoring Report
for North Carolina Division of Water Quality General Permit No. NCG120000
Datesubmitted i �I�aailq
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 Leanne Wilson r DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
LABORATORY Duke. Shealy, Mayo Lab Lab Cert. q Duke: 248. Shealy: § oi� CENED ❑Zero -flow ❑Water supply ❑SA
329. Mayo: 5064 Comments on sample collection or analysis: COC: ® Other Bowes Branch Class C
does not require fecal sampling. DEC 0 4 2019
ANTRAL FILES PLEASE REMEMBER TO SIGN ON THE REVERSE 4
DWR SECTION
Part A: Stormwater Benchmarks and Monitoring Results
n No discharge 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 =__>
-
-
120 mg/L
1000 count per 100 mL
100 mg/L
001
10/16/19 @1515
0.75
ND <20
See Comment
20
002
No Flow
0.75
See Comment
003
10/16/19 @ 1530
0.75
20
See Comment
95
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, reportthe-resnitas ">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 IVlonitoring Report
for North Carolina Division of Water Quality General Permit No. NCG120000
14:1S4&71161ulCi[3.]
CERTIFICATE OF COVERAGE NO. NCG120101
FACILITY NAME Mayo Steam Plant Monofill
COUNTY Person
PERSON COLLECTING SAMPLES Leanne Wilson
LABORATORY Duke, Shealy, Mayo Lab Lab Cert. # Duke: 248, Shealy:
329. Mavo: 5064 Comments on sample collection or analysis:
Part A: Stormwater Benchmarks and Monitoring Results
SAMPLE COLLECTION YEAR
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
n 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
10/16/19 @1515
0.75
<0.001
<0.001
<0.05
002
No Flow
0.75
003
10/16/19 @ 1530
0.75
0.0083
<0.001
0.192
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 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 ms/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. Se�o-�-^'Taermit text.
Permit Date:11/1/2018-05/31/2021 SWU-248, last revised 10/25/2012
Page 2 of 5

_ - - Semi-annual Stormwater'Discharge Monitorini 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 Leanne Wilson DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
L LABORATORY Duke, Shealy, Mayo Lab Lab Cert. # Duke: 248. Shealy: ❑Zero -flow [_]Watersupply [—]SA
329, Mayo: 5064 Comments on sample collection or analysis: M Other Bowes Branch Class C
Part A: Stormwater Benchmarks and Monitoring Results
PLEASE REMEMBER TO SIGN ON THE REVERSE -->
n No discharae this oeriod?z
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches;
PH
Conductivity
Benchmarks===>
-
-
S.U.
S/m
001
10/16/19 @1515
0.75
6.95
0.00796
002
No Flow
0.75
003
10/16/19 @ 1530
0.75
9.04 See Comment
0.0147
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".
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
n No dischorae this period?z
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
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 ANYONE OUTFALL?—�D
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 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

Comment:
Outfall 003: pH reading was out of the 6-9 ranee. Reading was a 9.04. No benchmark applies to this parameter, only requires it to be noted on report
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 managethe 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."
ttI Wo
(Date)
Permit Date: 11/1/2018-05/31/2021 SWU-248, last revised 10/25/2012
Page 5 of 5