NC0038377_Low level Hg - lab cross contamination_20201001

Action History (UTC-05:00) Eastern Time (US & Canada)
Subrrit by Anonymous User 10/1/2020 6:48:43 AM (Supplemental Submittal)
Submit by Bennett, Tilman B 5/16/2021 8:49:34 PM (Supplemental Info Submittal)
p Lowlevel Hg results issues - lab cross contamination - reported on eDMR in comments
• Bennett, Tilman B assigned the task to Bennett, Tilman B 5/16/2021 8:48 PM
• The task was assigned to Thedford, Wren, Bennett, Bradley 10/1/2020 6:48 AM

Initial Review Information
Updated ID#:* IWORTANf:FEVIBAERSl-IOLLDVERFYand revise here ifnecessary.
NC0038377
How should this project be handled?*
r File r Discard
Information Submitted on 10/1/2020
Submitter Information
Name: Joseph Heath Slade
Who is subrritting the information?
Email Address:* [e-mail]
Submittal Information
The Division of Water Resources (DWR) is providing this site to allow for the upload of required supplemental
information associated with discharge monitoring reports (DMR). All DMR data is required to be submitted
electronically through the eDMR system and should not be submitted here. Division staff will reviewall
uploaded documents and will only maintain required information. Documents such as laboratory reports are not required
to be submitted and will not be maintained in the system.
Project Information:
Rease SUDDly the Dernit number for this
Existing ID#* PerrritNunber
NC0038377
Examples: NOKxxxxxx or NO&xxxxx
Facility Name:* Mayo Steam Electric Power Plant
County: Person
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submited. *
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Mayo Electric Generating Plant NC 0038377 August
64.31 KB
2020 Low Level Hg.pdf
Only pdf files are accepted.
Comments about the attachments:
* W By checking the box and signing box below, I certify that:
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- I IICIVC IY.IVCII II UC, Cll.l.UI CIIC, CII IU I.VI I IF/ICLC II IIVI I I ICIIIVI I VII LI IIJ IVI II I,
• I agree that submission of this Supplemental Information form is a "transaction" subject to Chapter 66, Article 40 of the
NC General Statutes (the "Uniform Electronic Transactions Act)
• I agree to conduct this transaction by electronic means pursuant to Chapter 66, Article 40 of the NC General Statutes
(the "Uniform Electronic Transactions Act');
• I understand that an electronic signature has the same legal effect and can be enforced in the same way as a written
signature; AND
• I intend to electronically sign and submit the Supplemental Information form."
Full Name: Joseph Heath Slade
Signature:
Date Submitted: 10/01/2020

& DUKE
';PENERGY,
PROGRESS
File: Mayo 12520-B
Attn: Vanessa Manuel
Division of Water Quality
1617 Mail Service Center
Raleigh NC 27699-1617
Duke Energy Progress, LLC.
Mayo Steam Plant
10660 Boson Rd.
Roxboro, NC 27574
September 30, 2020
Subject: 15A NC Admin. Code 213.0506
Duke Energy Progress, LLC.
Mayo EIectric Generating Plant
National Pollutant Discharge Elimination System (NPDES) NCO038377
Ms. Manuel:
Please find attached the letter referenced in the comments section of the Mayo Steam Plant's August eDMR
and submitted via file upload to NCDEQ's NPDES Wastewater EDMR Supplemental Information Upload
site on September 30, 2020.
Instream low level mercury samples taken August It, 2020 on Mayo Reservoir were contaminated
during sample storage at Pace Analytical Lab. The sample result for 002 Downstream was reported
by Pace Analytical at 8.13 ng1L. This analytical result has been left blank after receiving
documentation of contamination from Pace Analytical and after consultation with the RRO. Duke
Energy will also use another laboratory going forward until we have assurance that any sample
storage/contamination issues are resolved.
Please contact Ms. Lori TolIie at [phone], if there are any questions concerning the information in
this submittal.
I certify, tinder penalty of law, that this document and all attachments ivere 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 far submitting false information, including the possibility of fines and imprisonment
for knowing violations.
Enclosures
3Scerel
m op o
Plant Manager

aceAnalytical
September 17, 2020
Duke Energy
3932 New Hill Holleman Rd., New Hill, NC 27562
Dear Richard Smith,
Pace Analytical Services, LLC is committed to providing high quality results and exemplary customer service to
our clients. Pace acknowledges the failure on our behalf to deliver accurate low-level mercury results for the
Duke Energy Mayo facility samples listed below. The issue was traced to sample cross -contamination in the
sample storage location.
Mayo
Proisct 1D
Lab Sam le ID
I Customer Sample ID
Collection
Result
Unit
Field Blank
MAY_INST
92490929002
MAY_INST_WC_B_1_ON_INST_028
8/11/2020
7.87
ng/L
X
MAY_INST
92490929001
MAY_INST_WC_B_ -DN_INST_021
8/11/2020
8.13
ng/L
Sample collection, bottle kits, sample digestion, and sample analysis were all ruled out as the source of
contamination. A different Pace customer started a new low-level mercury project that started June 23, 2020.
There were non -Duke Energy samples stored with the Duke Energy samples that had mercury concentrations
as high as 18,000 ng/L
Pace Analytical put in several corrective actions to help reduce the chance of sample cross contamination.
• Pace segregated non -Duke Energy samples from Duke Energy samples.
• We implemented a low-level mercury storage blank system to test for storage sample cross -
contamination issues.
• Bottle kits will now include a "trip blank" to travel with the samples from the collection point to the lab
and then will go through sample receiving to the storage location.
[01 828-417-6052
[e-mail]
9800 Kincey Avenue, Suite 100, Nuntersville. NC 28078
PACELABS.COM

aceAnalytical`
We apologize for any inconvenience or interruptions caused by this and appreciate the opportunity to support
your analytical needs.
Please do not hesitate to contact me or Kevin Herring if you have any questions or require additional
information.
Sincerely,
Barry Johnson
Sr. Quality Assurance Manager
101 828-417-6052
[e-mail]
9800 Kincey Avenue, Suite 100, Huntersville, NC 28078
PACELABS.COM