NCG500591_Compliance Evaluation Inspection_20210622

SENT VIA ELECTRONIC MAIL ONLY: NO HARD COPY WILL BE MAILED.

June 22, 2021

Preston H Pierce
Duke Energy Progress LLC
Email: [e-mail]

SUBJECT: Compliance Inspection Report
Marshall Hydroelectric Plant
NPDES WW Permit No. NCG500591
Madison County

Dear Permittee:

The North Carolina Division of Water Resources conducted an inspection of the Marshall Hydroelectric
Plant on 6/17/2021. This inspection was conducted to verify that the facility is operating in compliance
with the conditions and limitations specified in NPDES WW Permit No. NCG500591. The findings and
comments noted during this inspection are provided in the enclosed copy of the inspection report
entitled "Compliance Inspection Report".

There were no significant issues or findings noted during the inspection and therefore, a response to this
inspection report is not required.

If you should have any questions, please do not hesitate to contact me at 828-296-4500 or via email at
[e-mail].

Sincerely,

Stephanie Williams, Environmental Specialist
Water Quality Regional Operations Section
Asheville Regional Office
Division of Water Resources, NCDEQ

ATTACHMENTS: Inspection Report

Ec: Laserfiche

DocuSign Envelope ID: F6505FC1-B8EA-48AA-A38D-3AE4B32F5C66
EPA
United States Environmental Protection Agency
Washington, D.C. 20460
Water Compliance Inspection Report
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code NPDES yr/mo/day Inspection Type Inspector Fac Type
1 N 52 NCG500591 21/06/17 C S31112171819 20
21 66
Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 QA ----------------------Reserved-------------------
N67707172 73 74 75 80
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES permit Number)
Marshall Hydroelectric Plant
7602 Bear Creek Rd
Marshall NC 28753
Entry Time/Date Permit Effective Date
Exit Time/Date Permit Expiration Date
10:00AM 21/06/17 20/12/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Other Facility Data
11:30AM 21/06/17 25/11/30
Name, Address of Responsible Official/Title/Phone and Fax Number
Preston H Pierce,165 Bad Creek Rd Salem SC 29676/General Manager//Contacted
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Operations & Maintenance Records/Reports Self-Monitoring Program
Facility Site Review Effluent/Receiving Waters
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
(See attachment summary)
Name(s) and Signature(s) of Inspector(s)Agency/Office/Phone and Fax Numbers Date
Stephanie A Williams DWR/ARO WQ/828-296-4500/
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#1
DocuSign Envelope ID: F6505FC1-B8EA-48AA-A38D-3AE4B32F5C66
6/22/2021
6/22/2021
NPDES yr/mo/day
21/06/17
Inspection Type
C3111218
1
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Stephanie Williams, with the Asheville Regional Office, conducted a Compliance Evaluation Inspection
of the Marshall Hydroelectric Plant on June 17, 2021. The inspection was conducted to determine if
the system is being operated and maintained in compliance with General NPDES Permit No.
NCG500000. Marcus Pitts (Lead EHS Professional) was present during the inspection. No
deficiencies were noted during the inspection.
The Marshall Hydroelectric Plant consists of two Kaplan turbines. This facility is unique because the
turbines sit at a 45-degree angle. At the time of the inspection only one unit was operational; the
other unit was down for maintenance.
The water intake contains a rake which automatically rakes debris from the intake area and off the
bar screen.
There is one sump at the facility with a skimmer and oil detection. If oil is detected the system triggers
an alarm at the Duke operated Regulated Renewables Operations Center (RROC) and the pumps
automatically shut down to prevent discharge. The Spill Prevention, Control, and Countermeasure
(SPCC) Plan thoroughly outlines appropriate spill response. Drainage inside the powerhouse is
directed to the sump.
At the time of the inspection, the tailrace was free of foam and debris.
The transformer sits inside a containment area. When this containment fills with stormwater it is
checked for oil prior to being discharged into the river.
The sampling locations are appropriate and representative.
NCG500591 17 (Cont.)
Page#2
DocuSign Envelope ID: F6505FC1-B8EA-48AA-A38D-3AE4B32F5C66
Permit:NCG500591
Inspection Date:06/17/2021
Owner - Facility:
Inspection Type:
Marshall Hydroelectric Plant
Compliance Evaluation
Permit Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new
application?
Is the facility as described in the permit?
# Are there any special conditions for the permit?
Is access to the plant site restricted to the general public?
Is the inspector granted access to all areas for inspection?
The certificate of coverage took effect 12/31/2020 and expires 11/30/2025.Comment:
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping?
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment:
Effluent Pipe Yes No NA NE
Is right of way to the outfall properly maintained?
Are the receiving water free of foam other than trace amounts and other debris?
If effluent (diffuser pipes are required) are they operating properly?
Comment:
Effluent Sampling Yes No NA NE
Is composite sampling flow proportional?
Is sample collected below all treatment units?
Is proper volume collected?
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0
degrees Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
representative)?
Comment:
Upstream / Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type,
and sampling location)?
Page#3
DocuSign Envelope ID: F6505FC1-B8EA-48AA-A38D-3AE4B32F5C66
Permit:NCG500591
Inspection Date:06/17/2021
Owner - Facility:
Inspection Type:
Marshall Hydroelectric Plant
Compliance Evaluation
Upstream / Downstream Sampling Yes No NA NE
Comment:
Page#4
DocuSign Envelope ID: F6505FC1-B8EA-48AA-A38D-3AE4B32F5C66
arshall Hyrr
/j MMarshall H p I �NCG500591 '
y M NCG500591: (cooling water; oil & grease)
UPSTREAM EFFLUENT DOWNSTREAM Deita T
QT?)F
in French Broad River in French Broad River
(Station Tailrace) (After station discharge)
(Forebay- at the dam inlet)
Limit
fl. Trout Stream Limit Trout Stream Limit 20 mg/I Daily Max Trout StreamE Limit = WA 6.0-9.0 Limit= N/A 6.0-9.0 15 mg/I Mo. Avg. Limit= N/A 6.0-9.0Degree C
Sample Sample Sample
Time Time oil &Grease within Time o H s.u. 2-8 aC Max)
Degree °C pH (s.u.) Degrees °C pH (s.u.) (mGre Permit Degree C p ( )
Limit
3/4/2015 gal 2000 0915 8.70 N/A N 0910 8.80 6.74 <5.0 0842 8.80 N/A N
5/20/2015 gal 184 1108 17.40 N/A N 1046 18.10 6.81 <5.0 1056 18.40 N/A N
9/9/2915 gal 0 0834 24.30 N/A N 0831 24.30 7.01 <5.0 0839 23.90 N/A IN
12/10/2015 gal 1000 1143 8.20 N/A N 1135 8.20 6.90 <5.0 1148 8.20 N/A N
3/3/2016 gal 1000 1059 6.90 N/A N 1054 6.90 6.46 <5.0 1040 7.00 N/A N
6/1/2016 gal 1000 900 22.40 NA N 856 22.50 6.70 <5.0 912 22.80 N/A N
8/2/2016 gal 1000 1000 26.60 NA N 955 26.60 7.16 <5.0 1015 1 26.60 N/A N
12/8/2016 gal 1000 845 8.40 NA N 835 8.50 6.59 <5.0 852 8.50 N/A N
3/23/2017 CF No Flow 1100 10.60 NA N 1035 10.50 7.26 <5.0 1128 10.60 N/A N
5/25/2017 CF 1300 1136 16.60 NA N 1130 16.60 6.42 <5.0 1152 16.60 N/A N
9/14/2017 CF 1200 1442 17.40 NA N 1452 17.20 7.14 <5.0 1502 17.30 N/A N
12/19/2017 CF 1000 1602 5.20 NA N 1600 5.20 7.09 <5.0 1611 5.40 N/A N
1/26/2018 CF 950 1015 4.20 NA N 1009 4.10 6.11 <5.0 1039 4.30 N/A I N
4/1 to 6/30/18 No Units Operated this Quarter!
7/1 to 9/30/18 No Units Operated this Quarter!
10/1 to 12/31/18 No Units Operated this Quarter!
1/1 to 3/31/19 No Units Operated this Quarter!
411 to 6/30/19 No Units Operated this Quarter!* <5.0
9/30/2019 CF 1000 1108 24.00 NA N 1100 24.00 6.30 <5.0 1120 23.90 N/A N
10/16/2019 CF 1000 1120 16.66 NA N 1115 16.65 7.94 <5.0 1130 16.83 N/A N
3/30/2020 CF No Flow* 1450 16.30 NA N 1444 16.10 7.59 <5.0 1520 16.30 N/A N 1
W to 6/30/20 No Units Operated this Quarter!*
7/1 to 9/30/20 No Units Operated this Quarter!*
11/12/2020 1 CF 1 1000 F 1015 A16*54 NA N 1011 16.47 6.84 <5.0 1030 16.57 N/A N
3/2/2021 CF 850 1042 NA N 1034 9.22 7.10 <5.0 1131 9.25 N/A N
Green Y or Yes = within limit. Yellow N or Verify = against permit limit. Pagel

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