WQ0031506_Response NOV-2023-MV-0016_20230717

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IIWIIA
July 13, 2023
Orange Water and Sewer Authority
OWASA is Carrboro-Chapel Hill's not -for -profit public service agency
delivering high quality water, wastewater, and reclaimed water services.
Vanessa E. Manuel
Assistant Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NCDEQ
1628 Mail Service Center
Raleigh, NC 27699-1628
NC Dept of Environmental Quality
JUL 17 2023
Raleigh Regional Office
Re: Notice of Violation
Tracking Number: NOV-2023-MV-0116
OWASA Mason Farm WWTP Non -discharge Permit No. WQ0031506
Dear Ms. Manuel:
The Orange Water and Sewer Authority (OWASA) is in receipt of the subject Notice of Violation
(NOV) dated June 26, 2023 and received on July 3, 2023, concerning a monitoring frequency
violation for Total Ammonia Nitrogen (00610) (See Attachment 1).
We performed the required total ammonia nitrogen monitoring frequency for the week of
October 30, 2022 through November 5, 2022 (See Attachment 2). However, during the submittal
of the October 2022 NDMR, there was an oversight and we failed to report the October 31, 2022,
Total Ammonia Nitrogen value.
Confirmed by your guidance received during a phone call on July 10, 2023, we had revised and
resubmitted our October 2022 NDMR on July 6, 2023 (See Attachment 3) with total ammonia
nitrogen value of <0.10 mg/L on October 31, 2023. We have attached the corresponding OWASA
WWTP Laboratory Ammonia -Nitrogen Bench Sheet as additional documentation (see Attachment
2).
To prevent this from happening again, we have changed our review method by including an end of
the month review meeting with all parties who input data to reduce the risk of any clerical errors.
Thank you for your guidance and support working through this process. We respectfully request
NOV-2023-MV-0116 be rescinded in consideration of the information we have provided including
(1) monitoring was completed at the required frequency, we had a clerical error omitting one
sample result; (2) we submitted the revised NDMR, which includes the missing sample result as
soon as we were notified of the issue and received guidance on how to correct it; and (3) we have
taken corrective action to prevent reoccurrence on future NDMRs.
400 Jones Ferry Road, Carrboro, NC 27510 0 919-968-4421 C) [e-mail]
© @OWASA_NC
Q www.owasa.org

Response to Notice of Violation (NOV-2023-MV-0116)
Non -discharge Permit No. WQ0031506
July 13, 2023
Page 2
If you have any questions or need any additional information, please do not hesitate to contact me
or Wilmer Lawson, Wastewater Treatment and Biosolids Recycling Manager, at
[e-mail] or [phone].
Sincerely,
Todd Taylor,
Executive Director
Attachments:
1. NOV-2023-MV-0116
2. WWTP Laboratory NH3-N Bench Sheet
3. Revised October 2022 NDMR
CC: Mary Darr, P.E., General Manager of Operations
Wilmer Lawson, Wastewater Treatment and Biosolids Recycling Manager
Travis Rich, Operations Supervisor
Ronnie Weed, Laboratory Supervisor

Attachment 1
DocuSign Envelope ID: 45387DA2.0325-4909-8F78-Fl9B4D3BC15B
Certified Mail # 7020 3160 0000 2219 4928
Return Receipt Requested
June 26, 2023
Todd Taylor
Orange Water and Sewer Authority
400 Jones Ferry Rd
Carrboro, NC 27510-2001
SUBJECT: NOTICE OF VIOLATION
Tracking Number: NOV-2023-MV-0116
Permit No. WQ0031506
Mason Farm WWTP
Orange County
Dear Permittee:
mm�u g �I
JUL — 3 2023
NC Dept of Environmental Quality
JUL. 17 ?V'l
Raleigh Regional Office
A review of the November 2022 Non -Discharge Monitoring Report (NDMR) for the subject facility revealed the
violation(s) indicated below:
Monitoring Violation(s):
Sample Monitoring
Location Parameter Date Frequency Type of Violation
001 Nitrogen, Ammonia Total (as N) 11/5/2022 2 X week Frequency Violation
(00610)
Remedial actions, if not already implemented, should be taken to correct any noted problems. The Division of
Water Resources may pursue enforcement actions for this and any additional violations. If the violations are of a
continuing nature, not related to operation and/or maintenance problems, and you anticipate remedial
construction activities, then you may wish to consider applying for a Special Order by Consent (SOC).
If you have any questions concerning this matter or to apply for an SOC, please contact Dorothy Robson of
the Raleigh Regional Office at 919-791-4200.
Sincerely,
CD«usien4a by:
Ua{nd,SSa A, f. A AW L
B2916EW 32144F.
Vanessa E Manuel, Assistant Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NCDEQ
Cc: NON -DISCHARGE Laserfiche
DEQ1

Attachment 2
IFA
V
NH3-N BENCH SHEET
OWASA WWTP Laboratory (NC Conincate a 154)
Standard Methods 4500 NHa•D•20111(Ammonla
Selective Electrode Method), m9a. Reporting Llmll: 0.1 m91L
Date of Analysis
1111141122
Calibration Standard Reference A: S•1680
Time of Analysis
14AS
Check Standard (CCV) Reference N: S-1599
Analyst:
PM
ION RION(Suppliemol 11): JT Baker/2ZA'196200I
Instrument: Mercer Toloo, Seven MOU SN1228245267
PH test ships Lot N: Rlc"16112011
Spike Reference N:
Known(ICV) Reference N: K1341.7
Known True Value 1'I: 13.1
Known Range l�'• 110.6 117
Date
of
Sample
Calibration,
Sample, or QC
Standard ID
Dilution
Factor
10N NADH
volumeused
(mLs)
(C, D)
PH
-IISU
(yasln0)
Concentration
(from meter)
(myL)
(a)
Reported
Result"
ImglLl
(Cora. KOd F)
Quality Control
mLa Of
sample
Dilution
factor
(A)
a
Element
AccePlance
Crllene
Calculated
Value
Pass or
Fall
I111112022
0.1. 1.0. 10.0. 100 myL al standards
100
1
1
Y
slope (from mets):
90.102%
911.4
PASS
1111 W022
2nd Source Know(ICV)
100
1
1
V
12.11111
Ize
2nd Sours%Recovery:
PASS
111111J022
6"On. CCV (Range 46-65)
IN
1
1
Y
47.62
7.6
tPB%Recovey:
110%
PASS
fOD112029
'Influent Comp
IN
1
f
Y
36A66.9
11N130]]
'Influent Comp
f00
1
1
Y
47.917.9
r43.4
119=U
'influent Comp
100
1
1
Y
448t4.9
failrsOx]
'Al Comp
100
1
1
Y
3&918.9
fa]1rs022
-At Camp
100
1
1
Y
4144
11RD022
-At Comp
IN
1
1
Y
37.82
37.8
11R2oo2
-Al Camp
100
1
1
Y
46.75
4"
1111112012
"Mean Drab
IN
1
1
Y
0.770
0.77
IW31UC22
Effluent Comp
too
1
1
Y
0.060
-0.10
/1N2022
Effluent Comp
IN
I
1
Y
0.115
0.12
1191:1022
Effluent Comp
100
1
1
Y
0.047
0.10
LFM Dup RPD:
s26%
0.0%
PASS
111FrsOxx
Effluent Comp 0.2 mglL Spike"'
100
1
1
Y
2.M
234
LFM%Recovery:
80-IN%
114.6%
PASS
1/RROx2
0.2 myL
EffluentComp S Ike Du m
100
1
1
Y
2.343
2]4
LFMD % Recovery:
80.120 %
114.8%
PASS
IIHI12022
60myLCCV (Range 46.66)
100
1
1
Y
4%97
49.7
US%Recovery:
110%
PASS
111111112012
6.OmgR.CCV (Range4445)
100
1
1
Y
4.162
4.ae
LFB%Recovery:
t10%
PASS
11H1rso23
0.6mgIL CCV (Range 0.46.0.56)
IN
1
I
Y
OA66
OAS
LFB%Recovery;
t10%
PASS
1111112022
Method Blank (01 avatar)14
100
1
1
1
-0.05
c0.06 m91L
PASS
(1) 2nd Source Knovms- True value and rarl9es based an Cendicale of Analysis provided by suppler
(2) RemgiLN1%-N-Alwlalian=
mplL NIIrW A %B X ( )fact+D) I (IN +C) 1, wiwro
•1
APP oved-
A= 6lregn lade S A
oWi',
Dale.
B= sample anantasuan fran maser readnw(mgA)
C= volume of ION NaOH added to alibra0m standards (mL
D = volumo a 10N Na0H added to sample (mL)
S'.1WMP LebZomh SbaanVunmon1aVo22 dauW H1111122
aw,wa
Sample vacs n, must total IOOML
All non-0C samples ere preserved to PH<2 at we of allecion
Time of Analysis represents when the lost aldarabon slantlard H kddalirod.
W:P NPDES: NCD025241 WIP NPDES: NOODS2210
NYJIPRetlalmod: NOOD315O5 PWSID03S8010(WIPRecyded Wale)

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FORM: NDMR 03-12 NON -DISCHARGE MONITORING REPORT (NDMR) Pagc 3of--7
Sampling Person(s) Certified Laboratories
Name: Lab and Operator Staff Name: OWASA
Name: Wilmer Anthony Lawson Name: PACE Analytical, LLC
Does all monitoring data and sampling frequencies meet the requirements in Attachment A of your permit? CaaplWnt Noncompliant
If the facility is non -compliant, please explain In the space below the reason(s) the facility was not In compliance. Provide in your explanation the date(s) of the non-compliance and describe the corrective action(s) taken.
Attach additional sheets If necessary.
Operator In Responsible Charge (ORC) Certification Permlttee Certification
ORC: Travis Wayne Rich Permittee: Orange Water and Sewer Authority
Certification No.: 999730 Signing Official: Wilmer Anthony Lawson
Grade: IV Phone Number: 919-537-4354 Signing Official's Title: Wastewater Treatment & Biosolids Recycling Manager
Has the ORC changed since the previous NDMR? E] yes [ No Phone Number: 919-537-4351 Permit Expiration: 11/30/2027
Signature I Date
By the signature, I carry Nat one roped Is aocomato and complete to the Oast of my kno.Nodgo.
Signature Date
I wrtlly, under penalty of law, that title docoment and all aaacrand te wpro prepared under my direobon or supordslm In accohnco
Will, a system designed to a6sum Net all qualified personnel propody gathoro l and evaluated No Information submibed, Haw on my
Inquiry of No parson or persons "a manage the system, or gesso persons dimclly maporaftae for gelhadng fee Information. old
Information submitted le, b the Oust of my, knmdodge and bollol. We, sadness, and complete. I am award pal Vera are aignlbeent
ponaflas for submitting raise Infoma0on, Inducing No possibility of finds and Impdsonmonl for Wmrdng violations.
Mail Original and Two CDples to:
Division of Water Quality
Information Processing Unit
1617 Mall Service Center
Raleigh, North Carolina 27699-1617