#5203_2019_1105_TS_FINAL

Laboratory Cert. #:
5203
Laboratory Name:
Town of Parkton WWTP,
Inspection Type:
Field Municipal Maintenance
Inspector Name(s):
Tonja Springer
Inspection Date:
November 5, 2019
Date Forwarded for Initial
March 2, 2020
Review:
Initial Review by:
Tom Halvosa
Date Initial Review
March 3, 2020
Completed:
❑ Insp. Initial
❑ Insp. Reg
Cover Letter to use:
❑Insp. No Finding
❑Corrected
❑Insp. CP
(to use: rt click, properties, check)
®Insp. Reg. Delay
Unit Supervisor/Chemist II:
Todd Crawford
Date Received:
March 6, 2020
Date Forwarded to Admin.:
March 23, 2020
Date Mailed:
�
Special Mailing Instructions:
Send a copy to the Fayetteville Regional Office.

IZOY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIE.L SMITH
Director
5203
Mr. Roy Lowder
Town of Parkton WWTP
P.O. Box 55
Parkton, NC 28371
NORTH CAROLINA
Environmental Quality
March 23, 2020
Subject: North Carolina Wastewater/Groundwater Laboratory Certification (NC WW/GW
LC) Maintenance Inspection
Dear Mr. Lowder:
Enclosed is a report for the inspection performed on November 5, 2019 by Tonja Springer.
apologize for the delay in getting this report to you. Where Finding(s) are cited in this report, a
response is required. Within thirty days of receipt, please supply this office with a written item
for item description of how these Finding(s) were corrected. Please describe the steps taken to
prevent recurrence and include an implementation date for each corrective action. If the
Finding(s) cited in the enclosed report are not corrected, enforcement actions may be
recommended. For Certification maintenance, your laboratory must continue to carry out the
requirements set forth in 15A NCAC 2H .0800.
A copy of the laboratory's Certified Parameter List at the time of the audit is attached. This list
will reflect any changes made during the audit. Copies of the checklists completed during the
inspection may be requested from this office. Thank you for your cooperation during the
inspection. If wish to obtain an electronic copy of this report by email or if you have
questions or need additional information, please contact me at [phone] Ext. 259.
Sincerely
Todd Crawford
Technical Assistance & Compliance Specialist
Division of Water Resources
Attachment
cc: Tonja Springer, Dana Satterwhite,
Fayetteville Regional Office
North Carolina Department of Environmental Quality ; Division of Water Resources
4405 Reedy Creek Road 1 1623 Mail Service Center ! Raleigh, North Carolina 27699 1623
D."m&ma wk—w
919.733:3908

• It � b e 111
LABORATORY NAME: Town of Parkton WWTP
ADDRESS: 240 Sewer Plant Drive
Parkton, NC 28371
CERTIFICATE #: 5203
DATE OF INSPECTION: November 5, 2019
TYPE OF INSPECTION Field Municipal Maintenance
AUDITOR(S): Tonja Springer
I. INTRODUCTION:
This laboratory was inspected by a representative of the North Carolina Wastewater/Groundwater
Laboratory Certification (NC WW/GW LC) program to verify its compliance with the requirements
of 15A NCAC 02H .0800 for the analysis of compliance monitoring samples.
II. GENERAL COMMENTS:
The facility is neat and well organized and has all the equipment necessary to perform the
analyses. Staff was forthcoming and responded well to suggestions from the auditor.
All required Proficiency Testing (PT) Samples for the 2020 Calendar Year have not yet been
analyzed. The laboratory_ is reminded that results must be received by this office directly from the
vendor by September 30, 2020.
Contracted analyses are performed by Environmental Chemists, Inc. (Certification # 94).
Approved Procedure documents for the analysis of the facility's currently certified Field
Parameters were provided at the time of the inspection.
III. FINDINGS REQUIREMENTS COMMENTS AND RECOMMENDATIONS:
Documentation
Comment: The statement on the pH benchsheet for the effluent samples, "Samples measured in -
situ only time analyzed is recorded", does not reflect current laboratory protocol and must be
removed since samples are collected and brought back to the laboratory for analysis.

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#5203 Town of Parkton WWTP
A. Finding: The upstream/downstream notebook for Temperature and Dissolved Oxygen
(DO) is lacking required documentation: the method or Standard Operating Procedure, the
laboratory identification, the instrument identification, the sample collector, the signature or
initials of the analyst, permit number, parameter analyzed and the proper units of
measure.
Requirement: All laboratories shall use printable laboratory benchsheets. Certified Data
shall be traceable to the associated sample analyses and shall consist of: the method or
Standard Operating Procedure, the laboratory identification, the instrument identification,
the sample collector, signature or initials of the analyst, and the proper units of measure.
Each item shall be recorded each time samples are analyzed. Analyses shall conform to
methodologies found in Subparagraph (a)(1) of this Rule. Ref: 15A NCAC 02H .0805 (g)
(2) (A), (B), (C), (D), (E), and (Q.
Requirement: The following must be documented in indelible ink whenever sample
analysis is performed: Method reference, facility name, instrument identification (serial
number preferred), collector's/analyst's name or initials parameter analyzed, permit
number and units of measure. Ref: NC WW/GW LC Approved Procedure for the Analysis
of Dissolved Oxygen (DO) and NC WW/GW LC Approved Procedure for the Analysis of
Temperature.
Comment: The method reference, facility name, instrument identification, permit name
and proper units of measure can be recorded once inside the front cover of the notebook,
provided that any changes are clearly described and dated.
R. Finding: Only one time for sample collection and analysis is documented in the
upstream/downstream notebook for DO and Temperature without noting samples are
analyzed in -situ.
Requirement: Alternatively, one time may be documented for collection and analysis with
the notation that samples are measured in situ or immediately at the sampling site (i.e.,
immediately following collection at a location as near to the collection point as possible).
Ref: NC WW/GW LC Approved Procedure for the Analysis of Temperature; NC WW/GW
LC Approved Procedure for the Analysis of Dissolved Oxygen (DO).
Comment: When this 'one time' option is used, state that the documented time is both
collection and analysis time. This can be noted once inside the front cover of the
notebook, provided that -any -changes are clearly described and dated.
C. Finding: The DO meter calibration is not documented when upstream/downstream
monitoring is performed.
Requirement: The following must be documented in indelible ink whenever sample
analysis is performed: Meter calibration and/or verification date and time (s). Ref: NC
WW/GW LC Approved Procedure for the Analysis of Dissolved Oxygen (DO).
Requirement: The following must be documented in indelible ink whenever sample
analysis is performed: Calibration variables (temperature, elevation or barometric pressure
[in mmHg], and salinity). Ref: NC WW/GW LC Approved Procedure for the Analysis of
Dissolved Oxygen (DO).
Requirement: When performing analyses at multiple sample sites, the meter must be
calibrated at each sample site prior to analysis or a post -analysis calibration verification

Page 3
#5203 Town of Parkton WWTP
must be performed at the end of the run, regardless of meter type. The calculated
theoretical DO value must verify the meter reading within ±0.5 mg/L. If the meter
verification does not read within ±0.5 mg/L of the theoretical DO, corrective action must be
taken. Ref: NC WW/GW LC Approved Procedure for the Analysis of Dissolved Oxygen
(DO).
D. Finding: Documentation of the calibration variables for the DO meter does not include all
pertinent data.
Requirement: The following must be documented in indelible ink whenever sample
analysis is performed: Calibration variables (temperature, elevation or barometric pressure
[in mmHg], and salinity). Ref: NC WW/GW LC Approved Procedure for the Analysis of
Dissolved Oxygen (DO).
Comment: Only temperature is documented. Barometric pressure and salinity are
calibration variables that must be documented.
Comment: This Finding applies to the Effluent benchsheet.
E. Finding: The laboratory benchsheet for Total Residual Chlorine (TRC) is lacking pertinent
data: True value of the Daily Check Standard and percent recovery of the Daily Check
Standard,
Requirement: All laboratories shall use printable benchsheets. Certified Data shall be
traced to the associated sample analyses and shall consist of: the quality control
assessments. Each item shall be recorded each time samples are analyzed. Ref: 15A
NCAC 02H .0805 (g) (2) (0).
Requirement: The following must be documented in indelible ink whenever sample
analysis is performed: True value of the Daily Check Standard, percent recovery. Ref: NC
WW/GW LC Approved Procedure for the Analysis of Total Residual Chlorine (DPD
Colorimetric by SM 4500 Cl G-2011).
Comment: The benchsheet provides a space to document the true value of the Daily
Check Standard but it is not always utilized.
Comment: Percent Recovery of the Daily Check Standard must be documented to
demonstrate the analytical -process -is in control and the established acceptance criterion is being met
Quality Control
F. Finding: The laboratory is not calibrating mechanical volumetric liquid -dispensing devices
used for critical measurements at least once every 12 months.
Requirement: Mechanical volumetric liquid -dispensing devices (e.g., fixed and adjustable
auto-pipettors and bottle -top dispensers) shall be calibrated at least once every twelve
months. Ref: 15A NCAC 02H .0805 (g) (10).
Comment: The pipette is used in the TRC PT Sample preparation.
Chlorine, Total Residual — Standard Methods, 4500 Cl G-2011 (Aqueous)

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#5203 Town of Parkton WWTP
G. Finding: The laboratory is not analyzing a Method Blank when using laboratory -prepared
standards.
Requirement: Method Blanks would be required when using laboratory -prepared
standards [including Proficiency Testing (PT) Samples] and anytime sample dilutions are
performed. Ref: NC WW/GW LC Approved Procedure for the Analysis of Total Residual
Chlorine (DPD Colorimetric by SM 4500 Cl G-2011).
Requirement: The concentration of the Method Blank must not exceed 50% of the
reporting limit (i.e., the lowest calibration or calibration verification standard concentration),
unless otherwise specified by the reference method, or corrective action must be taken.
Method Blanks would be required when using laboratory -prepared standards [including
Proficiency Testing (PT) Samples] and anytime sample dilutions are performed. Ref: NC
WW/GW LC Approved Procedure for the Analysis of Total Residual Chlorine (DPD
Colorimetric by SM 4500 CI G-2011).
Comment: A Method Blank is not analyzed with the PT Sample. The prepared PT
Sample is considered a laboratory -prepared standard.
Comment: The Method Blank is deionized or distilled water from the same source used to
prepare the calibration verification standards or the PT Sample, and is analyzed like a
sample (i.e., with DPD/buffer added). The concentration of the Method Blank must not
exceed 50% of the reporting limit (i.e., the lowest calibration verification standard
concentration) or corrective action must be taken.
Reporting
H. Finding: Data qualifiers from the contract laboratory reports are not being transferred to
the Discharge Monitoring Report (DMR).
Requirement: Reported data associated with quality control failures, improper sample
collection, holding time exceedances, or improper preservation shall be qualified as such.
Ref: 15A NCAC 02H .0805 (e) (5).
Comment: This was noted for a Total Suspended Residue Effluent sample collected
January 15, 2019. Sample results reported by the contract laboratory included a qualifier
saying, "reporting limit elevated due to inadequate sample volume". The qualifier would be
documented in the comment section on the DMR.
Comment: The laboratory is reminded that Total Suspended Residue is a Method
Defined Parameter which must be followed exactly as written. Supplying the contract
laboratory with a full liter of sample is required to ensure compliance with this method.
I. Finding: The laboratory does not report all characteristics of the pollutants analyzed from
permitted locations.
Requirement: If the Permittee monitors any pollutant more frequently than required by
this permit using test procedures approved under 40 CFR Part 136 and at a sampling
location specified in this permit or other appropriate instrument governing the discharge,
the results of such monitoring shall be included in the calculation and reporting of the
data submitted on the DMR. Ref: Standard Conditions for NPDES Permits, Rev.
11/09/2011, Section E (5) (b).

Page 5
#5203 Town of Parkton WWTP
Comment: The laboratory is voluntarily measuring and documenting pH of the Influent.
The permit does not require Influent pH monitoring. The laboratory may discontinue
analyzing pH on the Influent or continue analyzing pH and report the results in the
comment section on the DMR.
The paper trail consisted of comparing original records (e.g., laboratory benchsheets, logbooks,
etc.) and contract laboratory reports to DMRs submitted to the North Carolina Division of Water
Resources. Data were reviewed for Town of Parkton WWTP (NPDES permit # NC0026921) for
January, June and September 2019. The following errors were noted:
Date
Parameter
Location
Contract Laboratory
Data
Value on DMR
1/8/2019
TSS
Influent
<5.3 mg/L
5.3 mg/L
1/8/2019
Fecal
Effluent
<2.0 colonies/100 mL
2.0 colonies/100 mL
1/15/2019
TSS
Influent
<5.4 m /L
5.4 m /L
1/22/2019
Fecal
Effluent
<1 MPN/100 mL
1 MPN/100 mL
1/29/2019
TSS
Influent
<5.6 mg/L
5.6 m /L
1/29/2019
Fecal
Effluent
1730 MPN/100 mL
Not reported
6/18/2019
Ammonia
Effluent
<0.2 m /L
0.2 m /L
6/25/2019
Ammonia
Effluent
<0.2 m /L
0.2 mg/L
6/25/2019
Fecal
Effluent
<1 MPN/100 mL
1 MPN/100 mL
9/3/2019
Ammonia
Effluent
<0.2 mg/L
0.2 m /L
9/3/2019
TSS
Effluent
<2.5 mg/L
2.5 m /L
9/3/2019
Fecal
Effluent
<1 MPN/100mL
1 MPN/100mL
9/10/2019
Ammonia
Effluent
<0.2 m /L
0.2 m /L
9/17/2019
Ammonia
Effluent
<0.2 m /L
0.2 m /L
9/17/2019
TSS
Effluent
<2.5 m /L
2.5 m /L
9/24/2019
Ammonia
Effluent
<0.2 m /L
0.2 m /L
9/24/2019
TSS
Effluent
<2.5 m /L
2.5 m /L
9/24/2019
BOD
Effluent
<2 m /L
2 m /L
The laboratory does not report undetected analytes as "less than" values. It is recommended that
the laboratory include the "<" sign when reporting undetected analytes in order for the monthly
average to be properly calculated. The NC DEQ document titled Directions for Completing
Monthly Discharge Monitoring Reports states: For calculation purposes only, recorded values of
less than a detectable limit (< #.##) may be considered to equal zero (0) for all parameters except
Fecal Coliform, for which values of 'less than" may be considered to be equal to one (1). Values
of results which are less than a detectable limit should be reported in the dailv cells usina the 'less
than" svmbol (<) and the detectable limit used durina the testina (or the value with appropriate unit
conversion). Please note there is never a case when an average would need to be recorded along
with a "less than" symbol.
Contract laboratory results for Ammonia (1.7 mg/L), BOD (4 mg/L), TSS (6.9 mg/L), Fecal
Coliform (62 colonies/ 100mQ and Conductivity (158 pmhos/cm) were reported on the DMR for
January 4, 2019 instead of January 3, 2019.
To avoid questions of legality, it is recommended that you contact the appropriate Regional Office
for guidance as to whether an amended DMR(s) will be required. A copy of this report will be
made available to the Regional Office.

Page 6
#5203 Town of Parkton WWTP
9NNEW •[aRIFyLORI
Correcting the above -cited Findings and implementing the Recommendations will help this
laboratory to produce quality data and meet Certification requirements. The inspector would like
to thank the staff for their assistance during the inspection and data review process. Please
respond to all Findings and include supporting documentation, implementation dates
and steps taken to prevent recurrence for each corrective action.
Report prepared by: Tonja Springer Date: March 2, 2020
Report reviewed by: Tom Halvosa Date: March 3, 2020

This document provides an approved procedure for the analysis of DO for compliance monitoring per 15A
NCAC 2H .0805 (a) (7) and (g) (4).
I. C•7ll7P►relk lZaA
® Samples must be analyzed within 15 minutes of collection (40 CFR Part 136 Table II); however, in situ or
immediate analysis is recommended due to the unstable nature of dissolved oxygen in samples.
RIAlk •- '.
• Types of probes:
a. Dissolved Oxygen Membrane Electrode
b. Luminescence Dissolved Oxygen (LDO) Sensor
® Instrument Warm-up Times: Galvanic sensors require no warm-up time. Polarographic sensors require
a 15-minute warm-up time. Optical sensors require no warm-up time.
® Movement of water across the membrane (for membrane electrode technologies) is important for
accurate readings. Some probes come with stirrers for this purpose. Measurements should be taken
while the stirrer is in use or by swirling the DO probe in the sample flow. Preferably, insert the probe into
flowing conditions. If analyzed in a container, stir gently with the probe or add a stir bar. Do not put the
probe on the sides or the bottom of the container.
• Movement across the sensor is not required for LDO probes.
• Follow the manufacturer's instructions for probe storage.
• Sample duplicates are not a required quality control element for Field parameters.
METER CALIBRATION:
® Instruments are to be calibrated according to the manufacturer's calibration procedure prior to analysis of
samples each day compliance monitoring is performed.
• The laboratory must use moist air for the air calibration. This is accomplished by calibrating the electrode
in an environment with a high relative humidity. Using dry air for the calibration can result in errant
readings.
• The laboratory must document each time that a calibration is performed. Calibration documentation must
include the instrument identification as well as the temperature, the elevation or barometric pressure (in
mmHg), and the salinity of the sample to be analyzed. After calibration, record the final DO reading in
mg/L or % saturation.
NOTE: Meters that also measure Conductivity may convert the Conductivity reading to Salinity to
use in the DO calibration. If the meter operates in that manner, it must be calibrated for Conductivity
before being calibrated for DO. If salinity is manually entered by the user during calibration and more
than one sample is analyzed, the meter must be recalibrated using the salinity of each new sample.
• For LDO sensors that cannot be calibrated by the user, the internal calibration must be verified each day
of use. This can be performed by back calculating the theoretical DO for the current air calibration
conditions (e.g., temperature, elevation, barometric pressure, etc.). The calculated DO value must verify
Rev. 12/06/2019

the meter reading within ±0.5 mg/L. Refer to the Dissolved Oxygen Meter Calibration Verification
handout at the end of this document. If the meter verification does not read within ±0.5 mg/L of the
theoretical DO, corrective action must be taken.
® When performing analyses at multiple sample sites, the meter must be calibrated at each sample site
prior to analysis or a post -analysis calibration verification must be performed at the end of the run,
regardless of meter type. The calculated theoretical DO value must verify the meter reading within ±0.5
mg/L. If the meter verification does not read within ±0.5 mg/L of the theoretical DO, corrective action
must be taken. If the meter is not calibrated at each sample site, it is recommended that a mid -day
calibration be performed when samples are extended over an extended period of time.
The following must be documented in indelible ink whenever sample analysis is performed.
1. Date and time of sample collection
2. Date and time of sample analysis to verify the 15-minute holding time is met. Alternatively, one time
may be documented for collection and analysis with the notation that samples are measured in situ
or immediately at the sample site
3. Facility name, sample site (ID or location), and permit number
4. Collector's/analyst's name or initials
5. Conductivity calibration standard and check standard values and check standard evaluation, if
applicable.
6. Calibration variables (temperature, elevation or barometric pressure [in mmHg], and salinity)
7. Meter calibration and/or verification date and time(s)
8. Final calibration information (final DO reading in mg/L or % saturation)
9. Theoretical value and DO meter reading for the calibration verification(s), where applicable
10. Units of measure
11. Instrument identification (serial number preferred)
12. Parameter analyzed
13. Method reference
14. Data qualifier(s), when applicable
15. Equipment maintenance (recommended)
Ref: Standard Methods 4500-0 G - 2011
Hach Method 10360, Rev. 1.2, October 2011
In Situ Method 1002-8-2009
ASTM Method D888-09 (B)
ASTM Method D888-09 (C)
Rev. 12/06/2019

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