NC0020834_NOV-2022-LV-0713 Response_20221017

Robinson, Jason
From: pu bl icworksdi rector warrenton.nc.gov <[e-mail]>
Sent: Monday. October 17, 2022 9:44 AM
To: Robinson, Jason
Cc: Manuel, Vanessa; townadministrator warrenton.nc.gov; Harris, Teresa
Subject: [External] RE: NOV-2022-LV-0713 - Warrenton WWTP - Permit NCO020834
Attachments: Warren County WWTP July 2022 EDMR.pdf; Meritech Lab Results 7-12-22, 7-14-22,
7-19-22-pdf, July 2022 TOW WWTP Daily Flow & Rainfall Data.pdf; S02 & CL2 Daily
Usage 6-7-22 - 8-8-22.pdf
Importance: High
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Good morning Mr. Robinson,
I am forwarding to you the communication email with original attachments that I sent Alys Hannum on Tuesday August
23, 2022 regarding being over the BOD5-day weekly average limit for Permit NC0020834.
The Town's opinion and explanation for what may have occurred is included in this forwarded email. We appreciate any
consideration that your office may be able to give us in connection with this violation. The Town's top priority is to be a
good steward of the plant, to always be in compliance with our permit, and to communicate properly with your
office. We appreciate the reminder regarding verbally notifying the Regional Office within 24 hours when our facility
has a limit violation.
Please advise me if this email is sufficient as an official response to the NOV-2022-LV-0713. I will be glad to provide
additional information and a copy of this response via USPS if needed.
Thank you for your direction and assistance with this matter.
Sincerely,
Bill Perkinson,
Public Works Director
Town of Warrenton
PO Box 281
Warrenton, NC_27589
Phone [phone]
Fax [phone]
Mobile [phone]
Email [e-mail]
From: publicworksdirector warrenton.nc.gov
Sent: Tuesday, August 23, 2022 3:41 PM
To: Hannum, Alys K <[e-mail]>
Cc: townadministrator warrenton.nc.gov <[e-mail]>; publicworksadmin warrenton.nc.gov
<[e-mail]>

Subject: Warren County WWTP Permit NC0020834 -July 2022 EDMR
Importance: High
Good afternoon Ms. Hannum,
I am contacting you to communicate that our July Monitoring report for Permit NCO020834 has a weekly average BODS
that is over our permit limit. Our weekly limit for BODS during summer months is 13.5 MG/L. Our average for the week
(week #i3, July) with the high result is 23.4 MG/L. Our monthly average BOD5 complies at 8.725 MG/L. We are
submitting our July EDMR this afternoon.
It is infrequent, but occasionally, we receive lab results from our contract lab that we question, and feel are incorrect.
Our BODS effluent results for July 14, 2022 was >42.1 MG/L. We have never had a result like that even when we
sampled during a rain event with an extremely high plant effluent flow. Our effluent flow rate for July 14, 2022 was
normal at 0.405 MGD. Also, the rest of the lab results for the effluent that day were nearly perfect...Ammonia Nitrogen -
<0.1 MG/L, Total Suspended Residue - <2.5 MG/L. It appears that we had perfect nitrification that day in our oxidation
ditch, the high BODS is illogical from a biological standpoint. We contacted our contract lab (Meritech) after receiving
the results and they stated that they knew it was high and out of character for our plant and that they rechecked the
sample and they feel it is correct. We can only conclude that Meritech must have mistakenly gotten our sample mixed
up with another facility's sample or had some other quality control issue in their laboratory when the samples were
tested. Our influent BODS results for samples pulled on the same day, July 14, 2022 were also uncharacteristically high
at >681 MG/L. We don't ever recall having a > result.
Our plant uses sulfur dioxide for dechlorination. It is my understanding that excessive dosing can contribute to a high
BOD5 result. We checked our records and usage was normal at approximately 10 LBS/Day during that period.
We would greatly appreciate any consideration that you can give us regarding this matter.
I have attached a copy of the July EDMR, Contract Lab Results for July 12th, 14th, and 191", July Rainfall and Flow Data,
and the CL2 S02 usage record during the period in question.
Sincerely,
Bill Perkinson,
Public Works Director
Town of Warrenton
PO Box 281
Warrenton, NC 27589
Phone [phone]
Fax [phone]
Mobile [phone]
Email publicworksdirectorPwarrenton.nc.gov
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized
state official.

Meritech, Inc.
Environmental Laboratory
Als-
Ami,
Laboratory Certification No. 165
Contact: 'Teresa
Report Date:
7/28/2022
Client: Warrenton, Town of�"VTP
NPDES#:
NCO020834
738 US Hwy 401 South
Warrenton, NC 27589
Date Sample Rcvd:
7/12/2022
Meritech Work Order # 07122 2251 Sample: Influent Composite
7/ 11-12/22
Parameters
Results Analysis Date Reporting
Limit
Method
BOD, 5 day
345 nng/L 7/13/22
2.0 mg/l.
SM 5210 B
'rota] Suspended Solids
303 mg/L 7/13/22
2.5 mg/L
SM 2540 D
Meritech Work Order it 071222252 Sample: Effluent Composite
7/1 1-12/22
Parameters
Results
Analysis Date
R&norting Limit
Method
BOD, 5 day
4.7 mg/L
7/13/22
2.0 nig/L
SM 5210 B
Total Suspended Solids
<2.5 mg/l.
7/13/22
2.5 prig/L
SM 2540 D
Ammnnia, Nitrogen
0.2 mg/L
7/13/22
0.1 mg/L
EPA 350.1
'rKN
0.56 mg/L
7/21/22
0.20 rng/L
EPA 351.1
Nitrate/Nitrite, Nitrogen
8.79 mg/l.
7/14/22
0.10 mg/L
EPA 353.2
Nitrogen, total
9.35 mg/L
7/21/22
0.20 rng/L
EPA 3S3.2
Phosphorus, total
3.42 mg/L
7/27/22
0.020 rng/L
EPA 200.7
1 hereby certify that I have reviewed and approve these data.
Laboratory Representative
642 Tamco Road, Reidsville, North Carolina 27320
tel.[phone]fax.[phone]

Contact: Teresa
Client: Warrenton, Town of W`VVTP
738 US Hwy 401 South
Warrenton, NC 27589
Meritech, Inc.
Environmental Laboratory
Laboratory Certification No. 165
Report Date: 7/25/2022
NPDES#: NCO020834
Date Sample ltcud: 7/14/2022
Meritech Work Order # 071422182 Sample: Influent Composite
Parameters Rgsult AnalyAs-Dj
Lig. Reporting Li1nit
BOD, 5 day >681 nig/L 7/1S/22 1.0 ing/L
'Total suspended Solids 212 ing/L 7/1 ii/22 2.5 rng/L
Meritech Work Order # 071422183 Sample- Effluent Comf;osite
Parameter Result Analysis Date Reporting Limit
BOD, 5 day >4:'.1 rnVL 7/15/22 2.0 mg/L
Total Suspended Solids < 2.5 mg/L 7/19/22 2.5 mg/I,
:lmmonra. Nitrogen �fi.l mg/l. 7t,9,'22 0 1 mg/L
7/13-14/22
Method Qualifier
SM 5210 B G7
SM 2540 D
7/13-14/22
Method uali r
SM 5210 B G7
SM 2540 D
EPA 150.1
G7 Less thair i mg/_. 00 n°nnained for all dilutions set. The reported x.alue is an estimated greater than va!ue
and is calculated i ;r the dilution using the least amount o sarnple.
1 hereby certify that 1 hone reviewed and approve these data. r
Laboratory Represe ive
642 Tamco Road, Reidsville, North Carolina 27320
tel.[phone] fax.[phone]

Meritech, Inc.
Environmental Laboratory
Laboratory Certification No. 165
Ccntact: Teresa Report Date: 8/1/2022
Client: Warrenton. Town of WWTP NPDES#. LNC0020834
738 US H%vy 401 South
Warrenton, NC 27589 Date Sample Rcvd- 7/19/2022
Meritech %'York Order # 071922104 Sample- Influent Composite 7/ 18-19/22
parameters Results Analysis Date Reporting Limit Method
BOD, 5 day 169 mg/L 7/20/22 2.0 rng/i. SM 5210 B
Total Suspended Solids 321 !ng,'L -0/20/22 2.S mg/3- SIM 2540 D
Meritech Work Order, 0 071922105 Sample- Effluent Composite 7/ 18-19/22
Parameters Results Analysis -Date Reporting Limit Method
BOD, 5 day
4.5 mg!L
+/20/22
2.0 rng/L
SM 5210 B
Fatal Suspended Sours
3 mgi L
7/20/22
2.5 mg/L
S,IM 2540 D
Ammonia, Nitrogen
<0 1 rng/L
+ ? 22/22
0.1 mg/ L
EPA 350.1
TKN
0.t.0 mpil,
7/26/22
0.20 mg/L
EPA351.1
Nitrate/Nitrite. Nrtrogr. n
13.6 rng,' L
7/20/22
0.10 rng/l.
EPA 353.2
i;iitrogen, totai
1.3.6 rng/L
7/26/22
0.20 mg/l,
EPA 353.2
Phosphorus, total
2-70 rng; L
7/30/22
0.020 rng/L
rPA 200.7
I herebv certify that I have reviewed and approve these data.
Laboratoty Repres tative
642 Tarnco Road, Reidsville, North Carolina 27320
te,,.f336,342-4748 fax [phone]

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Date
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1
WWTP
310423400
3104511000.
310488800Q
31115173011
310557600
310593300
310630000
310665600_
3105937
3107321
3107652000
3108124000
310852900
310896100
I 310951700D
310991600
311029
1 311067
311094300
311205700
311244
311278
311310500
311357103
311400
311449
3114917000
31153240DO
31.E 5667000
Monthly Total
Average
July-22
ITTT
Flow Rate - MGD
0.311
0.292
0.277
0.377
0.285
0.403
0.357
0.367
0.356
0.281
0.384
0.331
0.472
0.405
0.432
0.556
0.399
0.383
0.372
0.272
1.114
0.389
0.343
0.316
0.466
0.432
0.490
0.424
0.407
0.343
0.669
12.705 4.81
0.398 0.16