NC0020656_Compliance Report_20230207

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
Dixon Medlin
City of Laurinburg
PO Box 249
Laurinburg, NC 28353-0249
„E SfAIt o
a�M
NORTH CAROLINA
Environmental Quality
March 03, 2023
SUBJECT: Compliance Inspection Report
Leith Creek WWTP
NPDES WW Permit No. NCO020656
Scotland County
Dear Permittee:
The North Carolina Division of Water Resources conducted an inspection of the Leith Creek WWTP on
2/07/2023. This inspection was conducted to verify that the facility is operating in compliance with the
conditions and limitations specified in NPDES WW Permit No. NC0020656. 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.
A Whole Effluent Toxicity test was collected from the effluent, time -paced 24-hour composite equipment on
February 7 and 9, 2023 for use in a chronic Ceriodaphnia dubia pass/fail toxicity test. The Whole Effluent
Toxicity pass/fail test resulted in a "PASS" result.
The WWTP appeared well -maintained and had orderly housekeeping. The plant is not as currently described in
the permit: there are two digesters, drying beds that are used, as well as an equalization basin. The permit also
states a Copper Limitation Compliance, for which the WWTP has not submitted its report.
During review of eDMR from November 2022, one incorrect entry and three missing data points were found.
The COC reviewed did have the date and time of sample but was missing relinquishing information. Bench
sheets reviewed were completed, but it was noted that on many sheets, column labels and important
information was faded or non-existent. It was also noted that on some sheets the handwriting was difficult to
decipher. Additionally, samples that are not analyzed in the field require both a sampler and analyst initial on
the bench sheet. The WWTP did submit its annual compliance report, however it was noted that a list of all
violations from the previous year must be included in the report. There were multiple reagents that were found
to be past the expiration date. Staff also informed us that the notebook of their annual 5 standard calibration
reports, NIST traceability, and other documents were mistakenly thrown away. The Division recommends a
more careful approach in the future regarding documentation and bench sheets.
A new influent pump station was under construction during this inspection and staff believes it will be around
two years before it will be completed. The alarm system is activated by the float and transducer located further
North Carolina Department of Environmental Quality I Division of Water Resources
Fayetteville Regional Office 1225 Green Street. Suite 7141 Fayetteville, North Carolina 28301
910.433.3300

out. The alarm does not sound or alert at the influent station, but did alarm at the office, which was verified via
phone call. If there is no response at the office, the alarm is forwarded to the on -call work phone. The alarm is
tested once weekly and a testing log was available to review.
During the time of the inspection, the #4 aerator was out of service in the aeration basin. Some foam had
collected in an area where an aerator was not running but dispersed when the aerator turned on. Minimal
amount of foam had collected on edges, but the basin was free of visible dead spots. Aerators in the oxidation
ditches were operational and the ditch was free of foam. A float alarm had been installed to alert operators to
high water, which had happened previously due to a clogged pipe. The Division acknowledges the proactive
response of the operators.
Influent sampler is located in a refrigerated cabinet near the splitter box. The sampler is flow based and the
thermometer inside was N3 degrees C. The effluent sampler is located at the offsite outfall and at the time of
inspection, a temporary composite sampler was operating due to a malfunction of the main sampler. This
temporary sampler has been in place for approximately three weeks and is time based. The sampler did not
have a thermometer in place, which is required. Staff has been using ice in the bottom of the sampler to
maintain adequate temperature. Both influent and effluent flow meters were calibrated July 28, 2022 by J.S.
Dismuke Co Inc. They are scheduled to come every year to recalibrate. The facility also completes its own
upstream and downstream sampling.
The WWTP has an equalization basin used to store influent during times of high flow. At the time of inspection,
the basin was as low as the operators allow, with a small amount of water still in the bottom to protect
equipment. The basin has six surface aerators, one chosen at random did run when turned on. The float alarm,
which staff told us was brand new, sends an alarm to the office and then to the on -call cell phone. At the
Division's recommendation, staff agreed to begin a testing log to record tests for the float alarm at the
equalization basin. During the walk around, at least two small trees were noted on the burm that need to be
removed. There was also some evidence of erosion beginning in front of the control box for the pump nearest
the road and in the furthest back left corner. The Division recommends repairing these minor occurrences
before they create issues.
There are two digesters located at the WWTP. One is the plant's original, which is mostly used as the backup.
The main digester is on the newer side of the plant and is wasted to usually once a week. Staff informed us
that new blowers are scheduled to be installed but the current blowers were operating. The plant does accept
additional waste from a manhole location at Bridge Creek Rd.
If you should have any questions, please do not hesitate to contact Sharon Moran with the Water
Quality Regional Operations Section in the Fayetteville Regional Office at 910-916-3489 or via email at
[e-mail].
Sincerely,
EsDocuSigned by:
2BEVE499D6943D...
l�,vbw fit. rm.
Sharon Moran, Environmental Specialist
Water Quality Regional Operations Section
Fayetteville Regional Office
Division of Water Resources, NCDEQ
ATTACHMENTS
Cc: NPDES Laserfiche file
o.o.�e.�e�.•� D ��� North Carolina Department of Environmental Quality I Division of Water Resources
Fayetteville Regional Office 1225 Green Street. Suite 7141 Fayetteville, North Carolina 28301
910.433.3300

United States Environmental Protection Agency
Form Approved.
EPA Washington, D.C. 20460
OMB No. 2040-0057
Water Compliance Inspection Report
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 IN 1 2 u 3 I NCO020656 I11 121 23/02/07 I17 18I B I 19 I s I 201 I
211IIIII 111111III II III III1 I I IIIII IIIIIIIII II r6
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
70 I I 71 I n LI 72 I Lni I 71 I 74 79 I I I I I I I80
LJ -1 I I
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
Entry Time/Date
Permit Effective Date
POTW name and NPDES permit Number)
09:30AM 23/02/07
21/02/01
Leith Creek WWTP
Hall St Extension
Exit Time/Date
Permit Expiration Date
Laurinburg NC 28352
12:15PM 23/02/07
25/08/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Dixon Lee Medlin/ORC/910-291-1716/
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Robert A. EIIis,PO Box 249 Laurinburg NC 283530249H910-276-9374/9102773633
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit 0 Flow Measurement Operations & Maintenar Records/Reports
Self -Monitoring Progran 0 Sludge Handling Dispo: Facility Site Review Effluent/Receiving Wate
Laboratory
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
Sharon Moran Docusignedby: DWR/FRO WQ/910-433-3300/ 3/10/2023
LvDIn, I� 6rai .
52BE17E499D6943D...
Signature of Man q—FnF `tPtPAe1YK- iewer Agency/Office/Phone and Fax Numbers Date
Mark Brantle tt44 6raV kR/FRO WQ/910-433-3300 Ext.727/ 3/10/2023
E4E1A9691DB248E...
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type
NCO020656 I11 12I 23/02/07 117 18 IBI
(Cont.)
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
A Whole Effluent Toxicity test was collected from the effluent, time -paced 24-hour composite
equipment on February 7 and 9, 2023 for use in a chronic Ceriodaphnia dubia pass/fail toxicity test.
The Whole Effluent Toxicity pass/fail test resulted in a "PASS" result.
The WWTP appeared well -maintained and had orderly housekeeping. The plant is not as currently
described in the permit: there are two digesters, drying beds that are used, as well as an equalization
basin. The permit also states a Copper Limitation Compliance, for which the WWTP has not
submitted its report.
Records were available to review and were maintained as required by the permit. During review of
eDMR from November 2022, one incorrect entry and three missing data points were found. The COC
reviewed did have the date and time of sample but was missing relinquishing information. Bench
sheets reviewed were completed, but it was noted that on many sheets, column labels and important
information was faded or non-existent. It was also noted that on some sheets the handwriting was
difficult to decipher. Additionally, samples that are not analyzed in the field require both a sampler
and analyst initial on the bench sheet. The WWTP did submit its annual compliance report, however it
was noted that a list of all violations from the previous year must be included in the report. The ORC
log was available to review, in a bound notebook, and well organized.
During the lab review, equipment appeared to be in good repair and the lab was neatly organized.
There were multiple reagents that were found to be past the expiration date. Staff also informed us
that the notebook of their annual 5 standard calibration reports, NIST traceability, and other
documents were mistakenly thrown away. The Division recommends a more careful approach in the
future regarding documentation and bench sheets.
Two bar screens, one manual backup and one mechanical are located near the influent pump station.
The mechanical bar screen automatically operates as needed and was run during inspection.
Disposal of the waste removed occurs every Wednesday and is taken by the city of Laurinburg to the
landfill.
A new influent pump station was under construction during this inspection and staff believes it will be
around two years before it will be completed. It was observed that a downspout and trench were near
the influent pump station, but staff informed us that the downspout is not used and is closed off. The
trench ends in a pipe that is closed off, so any water that flows in during high water will run back into
the main system when water levels drop. There are four pumps in the wet well building. Pump one
and two, which operated during inspection, are variable speed which operate automatically to
maintain flow. Pump three and four are for higher flows. The float nearest the door appears to no
longer activate the alarm system. The alarm system is activated by the float and transducer located
further out. The alarm does not sound or alert at the influent station, but did alarm at the office, which
was verified via phone call. If there is no response at the office, the alarm is forwarded to the on -call
work phone. The alarm is tested once weekly and a testing log was available to review.
During the time of the inspection, the #4 aerator was out of service in the aeration basin. Some foam
had collected in an area where an aerator was not running but dispersed when the aerator turned on.
Minimal amount of foam had collected on edges, but the basin was free of visible dead spots.
Aerators in the oxidation ditches were operational and the ditch was free of foam. A float alarm had
been installed to alert operators to high water, which had happened previously due to a clogged pipe.
The Division acknowledges the proactive response of the operators.
All three secondary clarifiers were operating normally at the time of inspection and were free of
excessive foam and floating sludge. Effluent appeared clear and free of solids. Effluent weirs were
very clean. The sludge judge showed about two feet of sludge and two more feet of very cloudy
material.
The WWTP has three chlorination chambers, one selected at random had an approximately 1 ft
blanket of sludge. The site maintained an adequate supply of liquid disinfectant and the disinfectant
pumps were flow paced. The de -chlorination stage is located underground where the streams from
both sides of the plant meet. De -chlorination is gas based.
Influent sampler is located in a refrigerated cabinet near the splitter box. The sampler is flow based
and the thermometer inside was -3 degrees C. The effluent sampler is located at the offsite outfall
Page#

Permit: NCO020656
Inspection Date: 02/07/2023
Owner -Facility: Leith Creek WWTP
Inspection Type: Bioassay Compliance
and at the time of inspection, a temporary composite sampler was operating due to a malfunction of
the main sampler. This temporary sampler has been in place for approximately three weeks and is
time based. The sampler did not have a thermometer in place, which is required. Staff has been
using ice in the bottom of the sampler to maintain adequate temperature. Both influent and effluent
flow meters were calibrated July 28, 2022 by J.S. Dismuke Co Inc. They are scheduled to come every
year to recalibrate. The facility also completes its own upstream and downstream sampling.
The back up generator onsite is automatically tested under load and did not run at the time of this
inspection. A log is kept of the generator's running hours and was available for review. Quarterly
maintenance is scheduled for the generator. Cooper's Petroleum provides the fuel service.
The WWTP has an equalization basin used to store influent during times of high flow. At the time of
inspection, the basin was as low as the operators allow, with a small amount of water still in the
bottom to protect equipment. The basin has six surface aerators, one chosen at random did run when
turned on. The float alarm, which staff told us was brand new, sends an alarm to the office and then
to the on -call cell phone. At the Division's recommendation, staff agreed to begin a testing log to
record tests for the float alarm at the equalization basin. During the walk around, at least two small
trees were noted on the burm that need to be removed. There was also some evidence of erosion
beginning in front of the control box for the pump nearest the road and in the furthest back left
corner. The Division recommends repairing these minor occurrences before they create issues.
There are two digesters located at the WWTP. One is the plant's original, which is mostly used as the
backup. The main digester is on the newer side of the plant and is wasted to usually once a week.
Staff informed us that new blowers are scheduled to be installed but the current blowers were
operating. The plant does accept additional waste from a manhole location at Bridge Creek Rd.
Page#

Permit: NCO020656
Inspection Date: 02/07/2023
Owner -Facility: Leith Creek WWTP
Inspection Type: Bioassay Compliance
Record Keeping
Are records kept and maintained as required by the permit?
Is all required information readily available, complete and current?
Are all records maintained for 3 years (lab. reg. required 5 years)?
Are analytical results consistent with data reported on DMRs?
Is the chain -of -custody complete?
Dates, times and location of sampling
Name of individual performing the sampling
Results of analysis and calibration
Dates of analysis
Name of person performing analyses
Transported COCs
Are DMRs complete: do they include all permit parameters?
Has the facility submitted its annual compliance report to users and DWQ?
(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified
operator on each shift?
Is the ORC visitation log available and current?
Is the ORC certified at grade equal to or higher than the facility classification?
Is the backup operator certified at one grade less or greater than the facility
classification?
Is a copy of the current NPDES permit available on site?
Facility has copy of previous year's Annual Report on file for review?
Yes
No
NA
NE
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Comment: Effluent Pollutant Scan for 2022 not completed. WWTP must submit Copper Limitation
Compliance Report. COCs reviewed were mostly complete but some did lack
relinquishing information. We note that some sheets did not copy all required
information, including column names. The Division also suggests that more care be
taken with handwritten information to maintain clarity. The 2022 Annual Report had
been turned in but lacked the required section of violations.
Permit
Yes
No
NA
NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new
❑
❑
0
❑
application?
Is the facility as described in the permit?
❑
0
❑
❑
# Are there any special conditions for the permit?
M
❑
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❑
Is access to the plant site restricted to the general public?
0
❑
❑
❑
Is the inspector granted access to all areas for inspection?
■
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❑
Page# 4

Permit: NCO020656
Inspection Date: 02/07/2023
Permit
Owner -Facility: Leith Creek WWTP
Inspection Type: Bioassay Compliance
Yes No NA NE
Comment: The plant is not as described in the permit: there are two digesters present, drying
beds that are used, as well as an equalization basin. The permit also states a Copper
Limitation Compliance, for which the WWTP has not submitted its report.
Laboratory
Yes
No
NA NE
Are field parameters performed by certified personnel or laboratory?
0
❑
❑ ❑
Are all other parameters(excluding field parameters) performed by a certified lab?
0
❑
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# Is the facility using a contract lab?
0
❑
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# Is proper temperature set for sample storage (kept at less than or equal to 6.0
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❑
degrees Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
0
❑
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Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees?
0
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Comment: Two reagents found to be out of date. No calibration records for equipment,
calibration
curves, or NIST tracebility papers were available for review. PH calibrated with three
points but no additional check buffer used. Second source check standard not
analyzed when testing for specific conductivity. Incorrect standard value listed on
bench sheet for specific conductivity.
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? 0 ❑ ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, IVICRT, Settleable ❑ ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment:
Upstream / Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type, 0 ❑ ❑ ❑
and sampling location)?
Comment:
Standby Power
Yes
No
NA
NE
Is automatically activated standby power available?
0
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Is the generator tested by interrupting primary power source?
0
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Is the generator tested under load?
0
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Was generator tested & operational during the inspection?
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0
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Do the generator(s) have adequate capacity to operate the entire wastewater site?
■
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Is there an emergency agreement with a fuel vendor for extended run on back-up
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power?
Page# 5

Permit: NC0020656
Inspection Date: 02/07/2023
Standby Power
Is the generator fuel level monitored?
Owner -Facility: Leith Creek WWTP
Inspection Type: Bioassay Compliance
Yes No NA NE
■ ❑ ❑ ❑
Comment: A log is kept of the generator's running hours and was available for review. Quarterly
maintenance is scheduled for the generator. Cooper's Petroleum provides the fuel
Bar Screens
Type of bar screen
Yes No NA NE
a.Manual
b.Mechanical
Are the bars adequately screening debris?
0
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Is the screen free of excessive debris?
0
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Is disposal of screening in compliance?
0
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Is the unit in good condition?
0
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Comment: A mechanical bar screen in the main use, and a manual backup
exists. Waste collected
by city of Laurinburg weekly and transported to landfill.
Grit Removal
Yes
No
NA
NE
Type of grit removal
a.Manual
❑
b.Mechanical
Is the grit free of excessive organic matter?
0
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Is the grit free of excessive odor?
0
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# Is disposal of grit in compliance?
0
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Comment:
Flow Measurement - Influent
Yes
No
NA
NE
# Is flow meter used for reporting?
❑
0
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Is flow meter calibrated annually?
0
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Is the flow meter operational?
0
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(If units are separated) Does the chart recorder match the flow meter?
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0
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Comment:
Pump Station - Influent Yes No NA NE
Is the pump wet well free of bypass lines or structures? 0 ❑ ❑ ❑
Is the wet well free of excessive grease? 0 ❑ ❑ ❑
Page# 6

Permit: NCO020656 Owner -Facility: Leith Creek WWTP
Inspection Date: 02/07/2023 Inspection Type: Bioassay Compliance
Pump Station - Influent Yes No NA NE
Are all pumps present?
0
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Are all pumps operable?
■
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Are float controls operable?
0
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Is SCADA telemetry available and operational?
0
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Is audible and visual alarm available and operational?
0
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Comment: The float nearest the door appears to no longer activate the alarm system. The alarm
system is activated by the float and transducer located further out. The alarm does not
sound or alert at the influent station, but did alarm at the office, which was verified via
phone call. If there is no response at the office, the alarm is forwarded to the on -call
work phone. The alarm is tested once weekly and a testing log was available to review.
A new influent pump station was under construction at the time of inspection.
Equalization Basins
Is the basin aerated?
Is the basin free of bypass lines or structures to the natural environment?
Is the basin free of excessive grease?
Are all pumps present?
Are all pumps operable?
Are float controls operable?
Are audible and visual alarms operable?
# Is basin size/volume adequate?
Yes No NA NE
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Comment: Float controls were brand new. Did not test audio and visual alarms, should also send
alarm to cell phone. The Division suggests scheduled testing and a log of tests.
Influent Sampling
Yes
No
NA
NE
# Is composite sampling flow proportional?
0
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Is sample collected above side streams?
■
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Is proper volume collected?
0
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Is the tubing clean?
0
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# Is proper temperature set for sample storage (kept at less than or equal to 6.0
■
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degrees Celsius)?
Is sampling performed according to the permit?
■
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Comment:
Aeration Basins Yes No NA NE
Mode of operation Ext. Air
Page# 7

Permit: NCO020656
Inspection Date: 02/07/2023
Aeration Basins
Owner -Facility: Leith Creek WWTP
Inspection Type: Bioassay Compliance
Type of aeration system
Is the basin free of dead spots?
Are surface aerators and mixers operational?
Are the diffusers operational?
Is the foam the proper color for the treatment process?
Does the foam cover less than 25% of the basin's surface?
Is the DO level acceptable?
Is the DO level acceptable?(1.0 to 3.0 mg/1)
Comment: #4 Aerator was not operational.
Oxidation Ditches
Are the aerators operational?
Are the aerators free of excessive solids build up?
# Is the foam the proper color for the treatment process?
Does the foam cover less than 25% of the basin's surface?
Is the DO level acceptable?
Are settleometer results acceptable (> 30 minutes)?
Is the DO level acceptable?(1.0 to 3.0 mg/1)
Are settelometer results acceptable?(400 to 800 ml/I in 30 minutes)
Yes No NA NE
Surface
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Yes No NA NE
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Comment: No foam at the time of inspection. Float alarm had recently been installed at the time of
inspection.
Secondary Clarifier
Is the clarifier free of black and odorous wastewater?
Is the site free of excessive buildup of solids in center well of circular clarifier?
Are weirs level?
Is the site free of weir blockage?
Is the site free of evidence of short-circuiting?
Is scum removal adequate?
Is the site free of excessive floating sludge?
Is the drive unit operational?
Is the return rate acceptable (low turbulence)?
Is the overflow clear of excessive solids/pin floc?
Yes No NA NE
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Page# 8

Permit: NCO020656 Owner -Facility: Leith Creek WWTP
Inspection Date: 02/07/2023 Inspection Type: Bioassay Compliance
Secondary Clarifier Yes No NA NE
Is the sludge blanket level acceptable? (Approximately'/4 of the sidewall depth) 0 ❑ ❑ ❑
Comment:
Disinfection -Liquid
Yes
No
NA
NE
Is there adequate reserve supply of disinfectant?
0
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(Sodium Hypochlorite) Is pump feed system operational?
0
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Is bulk storage tank containment area adequate? (free of leaks/open drains)
0
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Is the level of chlorine residual acceptable?
0
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Is the contact chamber free of growth, or sludge buildup?
0
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Is there chlorine residual prior to de -chlorination?
0
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Comment: Flow based pump, -1ft of sludge in randomly selected contact chamber.
De -chlorination
Yes
No
NA
NE
Type of system ?
Gas
Is the feed ratio proportional to chlorine amount (1 to 1)?
0
❑
❑
❑
Is storage appropriate for cylinders?
■
❑
❑
❑
# Is de -chlorination substance stored away from chlorine containers?
0
❑
❑
❑
Are the tablets the proper size and type?
❑
❑
0
❑
Comment: Located underground, could not visually inspect.
Are tablet de -chlorinators operational? ❑ ❑ ❑
Number of tubes in use?
Comment:
Effluent Sampling
Yes
No
NA
NE
Is composite sampling flow proportional?
❑
■
❑
❑
Is sample collected below all treatment units?
0
❑
❑
❑
Is proper volume collected?
■
❑
❑
❑
Is the tubing clean?
0
❑
❑
❑
# Is proper temperature set for sample storage (kept at less than or equal to 6.0
❑
0
❑
❑
degrees Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
❑
0
❑
❑
representative)?
Comment: Composite sampler is not sampling at a flow based rate as required by the
permit. No
thermometer was located in composite sampler to inspect.
Page#
9

Permit: NC0020656
Inspection Date: 02/07/2023
Effluent Sampling
Flow Measurement - Effluent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Owner -Facility: Leith Creek WWTP
Inspection Type: Bioassay Compliance
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Comment:
Aerobic Digester
Is the capacity adequate?
Is the mixing adequate?
Is the site free of excessive foaming in the tank?
# Is the odor acceptable?
# Is tankage available for properly waste sludge?
Comment: New blowers for Digester had been ordered at the time of
Drying Beds
Is there adequate drying bed space?
Is the sludge distribution on drying beds appropriate?
Are the drying beds free of vegetation?
# Is the site free of dry sludge remaining in beds?
Is the site free of stockpiled sludge?
Is the filtrate from sludge drying beds returned to the front of the plant?
# Is the sludge disposed of through county landfill?
# Is the sludge land applied?
(Vacuum filters) Is polymer mixing adequate?
Comment: Some small vegetation visible in drying beds.
.TO
Yes No NA NE
Yes
No
NA
NE
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
Yes
No
NA
NE
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
Yes
No
NA
NE
❑
❑
❑
❑
❑
❑
❑
❑
❑
■
❑
❑
❑
■
❑
❑
❑
❑
❑
❑
■
■
❑
❑
❑
❑
■
❑
❑
❑
❑
■
❑
Page# 10

Regional Inspectors' Checklist for Field Parameters
[This checklist is to be completed during regional plant inspections for Field Laboratories denoted by certification numbers in the 5000s.]
Facility Name: Leith Creek WWTP
Regional Plant Inspector: Sharon Moran
Permit #: NC0020656
Regional Inspector Contact #: 910 916-3489
Field Lab Certification M 133
Region: FRO
Lab Contact:
Date: 2/7/23
I. Check the parameter(s) performed at this site for reporting purposes.
® Total Residual Chlorine (TRC) ® Temperature (TEMP) ® Specific Conductance (SC)
® pH ® Dissolved Oxygen (DO) ❑ Settleable Residue (SETT)
11. General Laboratory (note any exceptions in section XI)
Are instruments, meters, probes, photometric cells, etc. maintained in good condition?
® Yes ❑ No
Are standards, reagents and consumables used within manufacturer expiration dates?
[TRC gel standard is exempt.] Conductivity and pH 10 expired.
❑ Yes ® No
Are the following items documented (� where applicable): **pH meter used for temp
Item
TRC
pH
TEMP
DO
SC
SETT
Date of sample collection*
x
Time of sample collection*
x
Sample collector's initials or signature
x
Date of sample analysis*
Time of sample analysis*
Analyst initials or signature
N/A
N/A
N/A
Sample site i.e., facility name, location, ID, etc.
Instrument ID
x
x
x
x
Parameter
Data qualifiers, when required
*Date and time of sample collection and analysis may be the same for in situ or on -site measurements.
III. Total Residual Chlorine — reference method:
Total Residual Chlorine meter make and model:
HACH 1900
Is a check standard analyzed each day of use? Circle one: gel or liquid standard
® Yes
❑ No
Does the check standard recover within ±10% of the known value?
® Yes
❑ No
What is the assigned/observed value of the daily check standard? 300 u /1— 10u /1
Is a 5-standard calibration verification performed? Note date of last verification: Doc missing
® Yes
❑ No
Alternatively, does the lab construct a linear regression, using 5 standards, to calculate
results? Note date of last calibration curve constructed:
❑ Yes
❑ No
True values: ❑ pg/L ❑ mg/L
Obtained values: ❑ pg/L ❑ mg/L
What program are samples analyzed on?
Are results reported in proper units? Check one: ® /L ❑ m /L
® Yes
❑ No
Are results reported between the facility's permit limit and the compliance limit of 50 /L?
® Yes
❑ No
Are results less than the low standard reported as "<x", where x=low standard conc.?
® Yes
❑ No
Is DPD/buffer added within 15 minutes of collection?
® Yes
❑ No
Is a post -analysis check standard analyzed if samples are analyzed at multiple sites? N/A
❑ Yes
❑ No
IV. pH — reference method:
H meter manufacturer and model:
YSI Pro10
Is the pH meter calibrated with at least 2 buffers per mfg's instructions each day of use?
Note buffers used: 4,7,10
® Yes
❑ No
Is the pH meter calibration checked with an additional buffer prior to sample analysis?
Note check buffer used:
❑ Yes
® No
Does the check buffer read within ±0.1 S.U. of the known value?
® Yes
❑ No
Are the following items documented:
Meter calibration?
® Yes
❑ No
Check buffer readin s ?
® Yes
❑ No
Are samples analyzed within 15 minutes of collection?
® Yes
❑ No
Are sample results reported to 0.1 pH units on the eDMR?
❑ Yes
❑ No
Is a post -analysis check buffer analyzed if samples are analyzed at multiple sites? N/A
❑ Yes
❑ No

V. Temperature — reference method:
What instrument(s) is used to measure temperature? Check all that apply: ® pH meter
❑ DO meter ❑ Conductivity meter ❑ Digital thermometer ❑ Glass thermometer
Is the instrument/thermometer calibration checked at least annually against a NIST
traceable thermometer?
❑ Yes
® No
Is NIST traceability documentation maintained on site?
❑ Yes
® No
Are samples measured within 15 minutes?
❑ Yes
❑ No
Are sample results reported in degrees C?
❑ Yes
❑ No
VI. Dissolved Oxygen — reference method:
DO meter make and model:
YSI Pro Solo
Is the air calibration of the DO meter performed each day of use?
® Yes
❑ No
Is meter calibration documented?
® Yes
❑ No
Are samples analyzed within 15 minutes of collection?
® Yes
❑ No
Are results reported in mg/L?
® Yes
❑ No
If samples are analyzed at multiple sites, is the meter recalibrated at each site or a post-
analysis calibration verification performed? N/A
❑ Yes
❑ No
Does the post -analysis verification theoretical value agree within 0.5 mg/L of the meter
calibration reading? N/A
❑ Yes
❑ No
VII. Conductivity — reference method:
Conductivity meter make and model:
EcoSense
EC330a
Is the meter calibrated daily according to the manufacturer's instructions? Note standard
used this is generally a one -point calibration):
® Yes
❑ No
Is a daily check standard analyzed? Note value:
❑ Yes
® No
Is meter calibration documented?
❑ Yes
® No
Are samples analyzed within 28 days of collection?
® Yes
❑ No
Is a post -analysis check standard analyzed if multiple samples are analyzed?
Are results reported in pmhos/cm some meters display equivalent pS/cm units)?
® Yes
❑ No
Vill. Settleable Residue — reference method:
N/A
Does the laboratory have an Imhoff Cone in good condition?
❑ Yes
❑ No
Is the sample settled for 1 hour?
❑ Yes
❑ No
Is the sample agitated after 45 minutes?
❑ Yes
❑ No
Are the following items documented:
Volume of sample analyzed? Note volume analyzed (must use 1 L):
❑
Yes
❑
No
Date and time of sample analysis (settling start time)?
❑
Yes
❑
No
Time of agitation after 45 minutes of settling?
❑
Yes
❑
No
Sample analysis completion(settling end time)?
❑
Yes
❑
No
Are samples analyzed within 48 hours of collection?
❑
Yes
❑
No
Are results reported in ml/L?
❑
Yes
❑
No
IX. Was a paper trail (comparing contract lab and on -site data to DMRs)
performed? If so, list months reviewed: November 2022
® Yes
❑ No
X. Is follow-up by the Laboratory Certification program recommended?
® Yes
❑ No
XI. Additional comments:
Both sampler and analyst initials required for samples not analyzed in the field. Conductivity reagent (10/2022)
and pH 10 buffer (12/2021) expired. Documents for NIST and annual calibrations missing. After calibration
against three buffers, pH meter not checked against additional buffer before use. Specific conductivity requires
two sources for calibration, currently lab is only using one. TSS samples should be 1 L in volume.
Please submit a copy of this completed form to the Laboratory Certification program at:
DWR Lab Certification, Water Sciences Section, 1623 Mail Service Center, Raleigh NC, 27699-1623
Electronic copies may be emailed to Jennifer.seaver(a)ncdenr.gov.
Revision 3/2021