NC0043176_Compliance Evaluation Inspection_20211222

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH
Director
Steven Neuschafer
City of Dunn
PO Box 1065
Dunn, NC 28335
NORTH CAROLINA
Environmental Quality
December 22, 2021
SUBJECT: Compliance Inspection Report
Dunn WWTP
NPDES WW Permit No. NC0043176
Harnett County
Dear Permittee:
The North Carolina Division of Water Resources conducted an inspection of the Dunn WWTP on
12/07/2021. This inspection was conducted to verify that the facility is operating in compliance with the
conditions and limitations specified in NPDES WW Permit No. NC0043176. 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.
Inspection Summary
All records, including an ORC log, were available at the time of the review and complete.
Facility grounds and laboratory were very well -maintained and orderly. Plant process controls include
MLSS, pH, DO, and sludge judge. The facilities permit expires in 2023. The plant continues to operate
under special permit conditions. Nutrient sampling continues monthly until the next permit cycle.
Additionally, the plant is on track to complete the requirement of monitoring for
Bis(2-Ethylhexyl)phthalate in Jan. 2022. Previous samples have all been non -detect. The plant analyses
fecal coliform, ammonia, and field parameters in-house. Other testing is contracted to Environment One.
DO temperature is calibrated with an NIST thermometer kept at the public water plant. Staff sent
documentation that the NIST thermometer was last calibrated in 2019 (valid for five years).
DMRs from Jan. 2020 and Feb. 2020 were reviewed during the inspection. Two errors were found for
flow —one in January and one in February. Staff will submit amended DMRs as soon as possible.
Effluent was collected from Dunn WWTP's 24-hour composite equipment on December 7th and December
9th, 2021, for chronic toxicity testing. The facility passed the chronic Ceriodaphnia dubia pass/fail test
performed by the DEQ Aquatic Toxicology Lab.
DEQ
North Carolina Deportment of Environmental Quality I Division of Water Resources
Fayetteville Regional ice 1225 Green Street Sure 714 I Fayetteville. North Carolina 25201
910.4333300

Dumpsters at the bar screen and grit chamber are emptied every Wednesday. Influent sampler tubing
contained a moderate amount of biofilm during the inspection. Wastewater pH is adjusted with soda ash
after wastewater leaves the aeration basin. Staff replaced the tubing by the end of the day. The sludge
blanket was measured at two of three secondary clarifiers. Sludge level was 0.5 ft. in the 10 ft. clarifier
and 3 ft. in the 12 ft. clarifier.
The plant has two back-up generators. The 500 kw powers disinfection and effleuent pump station. The
1000 kw can power the entire plant. Standby power is tested under load weekly. The facility keeps
records of testing and maintenance.
The aerobic digestor was empty at the time of inspection except for water sufficient enough to cover the
diffusers. The flow meter was calibrated on 1/26/2021. Solids handling equipment is torn down and
cleaned every 6 weeks. Sludge is hauled off by Granville Farms. As a member of the Cape Fear River
Basin Association the facility is exempt from performing their own upstream and downstream sampling.
If you should have any questions, please do not hesitate to contact Stephanie Zorio with the Water
Quality Regional Operations Section in the Fayetteville Regional Office at 910-433-3300 or via email at
[e-mail].
ATTACHMENTS
Cc: Laserflche
Sincerely,
p-DocuSigned by:
`-----A99704FAED5D494...
Dr. Stephanie D. Zorio, Environmental Specialist
Water Quality Regional Operations Section
Fayetteville Regional Office
Division of Water Resources, NCDEQ
D_Q
North Carolina Department of Environmental Quality I Division of Water Resources
Fayetteville Regional Office l 225 Green Street. Suite 1]4 I Fayetteville. North Carolina 25301
910.4333300

United States Environmental Protection Agency
E PA Washington, D.C. 20460
Water Compliance Inspection Report
Form Approved.
OMB No. 2040-0057
Approval expires 8-31-98
Section A: National Data System Coding (i.e., PCS)
Transaction Code
1 IN I 2 IL
21IIIIII
I
IIIIIIIIIII
NPDES yr/mo/day Inspection
3 I NC0043176 111 121 21/12/07 117
Type
181 R I
IIIIIIIIIII
Inspector Fac Type
191 S I 2011
IIIIIII I IIIIII
P6
Inspection Work Days
671
Facility Self -Monitoring Evaluation Rating B1 QA Reserved
I 70I I 711D 1 72 I N I 73I I 74 71
I I
I I I I I I 180
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES Dermit Number)
Dunn WWTP
Susan Tart Rd
Dunn NC 28335
Entry Time/Date
09:30AM 21/12/07
Permit Effective Date
19/04/01
Exit Time/Date
01:30PM 21/12/07
Permit Expiration Date
23/09/30
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Donrie Eldridge Dukes/ORC/910-892-8162/
Other Facility Data
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Steven Neuschafer,PO Box 1065 Dunn NC 28335//910-892-2633/
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Flow Measurement Operations & Maintenar Records/Reports
Self -Monitoring Progran Sludge Handling DispoFacility 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)
Stephanie Zorio
of Inspector(s) Agency/Office/Phone and Fax Numbers Date
a— DocuSigned by: DWR/FRO WQ/910-433-3322/
4. 12/22/2021
'-A99704FAED5D494...
Signature of Management
Mark Brantle
Q A Reviewer Agency/Office/Phone and Fax Numbers Date
DocuSigned by:
f hot fr R/FRO WQ/910-433-3300 Ext.727/ 12/22/2021
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page# 1

3I
NPDES yr/mo/day
NC0043176 111 121 21/12/07
17
Inspection Type
18 LB]
(Cont.)
1
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
All records, including an ORC log, were available at the time of the review and complete.
Facility grounds and laboratory were very well -maintained and orderly. Plant process controls include
MLSS, pH, DO, and sludge judge. The facilities permit expires in 2023. The plant continues to
operate under special permit conditions. Nutrient sampling continues monthly until the next permit
cycle. Additionally, the plant is on track to complete the requirement of monitoring for
Bis(2-Ethylhexyl)phthalate in Jan. 2022. Previous samples have all been non -detect. The plant
analyses fecal coliform, ammonia, and field parameters in-house. Other testing is contracted to
Environment One. DO temperature is calibrated with an NIST thermometer kept at the public water
plant. Staff sent documentation that the NIST thermometer was last calibrated in 2019 (valid for five
years).
DMRs from Jan. 2020 and Feb. 2020 were reviewed during the inspection. Two errors were found for
flow —one in January and one in February. Staff will submit amended DMRs as soon as possible.
Effluent was collected from Dunn WWTP's 24-hour composite equipment on December 7th and
December 9th, 2021, for chronic toxicity testing. The facility passed the chronic Ceriodaphnia dubia
pass/fail test performed by the DEQ Aquatic Toxicology Lab.
Dumpsters at the bar screen and grit chamber are emptied every Wednesday. Influent sampler
tubing contained a moderate amount of biofilm during the inspection. Wastewater pH is adjusted with
soda ash after wastewater leaves the aeration basin. Staff replaced the tubing by the end of the day.
The sludge blanket was measured at two of three secondary clarifiers. Sludge level was 0.5 ft. in the
10 ft. clarifier and 3 ft. in the 12 ft. clarifier.
The plant has two back-up generators. The 500 kw powers disinfection and effleuent pump station.
The 1000 kw can power the entire plant. Standby power is tested under load weekly. The facility
keeps records of testing and maintenance.
The aerobic digestor was empty at the time of inspection except for water sufficient enough to cover
the diffusers. The flow meter was calibrated on 1/26/2021. Solids handling equipment is torn down
and cleaned every 6 weeks. Sludge is hauled off by Granville Farms. As a member of the Cape Fear
River Basin Association the facility is exempt from performing their own upstream and downstream
sampling.
Page# 2

Permit: NC0043176
Inspection Date: 12/07/2021
Owner - Facility: Dunn 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?
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
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? MODE
(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? • ❑ ❑ El
Facility has copy of previous year's Annual Report on file for review? • ❑ El El
Comment: DMRs from Jan. 2020 and Feb. 2020 were reviewed during the inspection. Two errors
were found for flow —one in January and one in February. Staff will submit amended
DMRs as soon as possible.
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? • ❑ ❑ ❑
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable ▪ El El El
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: Plant process controls include MLSS, pH, DO, and sludge judge.
Permit Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new ❑ ❑ ❑
application?
Is the facility as described in the permit? • ❑ ❑ ❑
Page# 3

Permit: NC0043176
Inspection Date: 12/07/2021
Owner - Facility: Dunn WWTP
Inspection Type: Bioassay Compliance
Permit Yes No NA NE
# Are there any special conditions for the permit? • ❑ ❑ ❑
Is access to the plant site restricted to the general public? • ❑ ❑ ❑
Is the inspector granted access to all areas for inspection? • ❑ ❑ ❑
Comment: The facilities permit expires in 2023. The plant continues to operate under special
permit conditions. Nutrient sampling continues monthly until the next permit cycle.
Additionally, the plant is on track to complete the requirement of monitoring for
Bis(2-Ethylhexyl)phthalate in Jan. 2022. Previous samples have all been non -detect.
Standby Power
Is automatically activated standby power available?
Is the generator tested by interrupting primary power source?
Is the generator tested under load?
Was generator tested & operational during the inspection?
Do the generator(s) have adequate capacity to operate the entire wastewater site?
Is there an emergency agreement with a fuel vendor for extended run on back-up
power?
Is the generator fuel level monitored?
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
Comment: The plant has two back-up generators. The 500 kw powers disinfection and effleuent
pump station. The 1000 kw can power the entire plant. Standby power is tested under
load weekly. The facility keeps records of testing and maintenance.
Bar Screens Yes No NA NE
Type of bar screen
a.Manual ❑
b.Mechanical •
Are the bars adequately screening debris? • ❑ ❑ ❑
Is the screen free of excessive debris? ■ ❑ ❑ ❑
Is disposal of screening in compliance? ■ ❑ ❑ ❑
Is the unit in good condition? • ❑ ❑ ❑
Comment: Dumpsters at the bar screen and grit chamber are emptied every Wednesday.
Pump Station - Influent
Is the pump wet well free of bypass lines or structures?
Is the wet well free of excessive grease?
Are all pumps present?
Are all pumps operable?
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
▪ ❑ ❑ ❑
Page# 4

Permit: NC0043176
Inspection Date: 12/07/2021
Owner - Facility: Dunn WWTP
Inspection Type: Bioassay Compliance
Pump Station - Influent Yes No NA NE
Are float controls operable? • ❑ ❑ ❑
Is SCADA telemetry available and operational? • El El El
Is audible and visual alarm available and operational? ❑ ❑ • ❑
Comment:
Grit Removal Yes No NA NE
Type of grit removal
a.Manual ❑
b.Mechanical •
Is the grit free of excessive organic matter? ■ ❑ ❑ ❑
Is the grit free of excessive odor? • ❑ El ❑
# Is disposal of grit in compliance? • El El El
Comment: Dumpsters at the bar screen and grit chamber are emptied every Wednesday.
Flow Measurement - Influent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Comment: The flow meter was calibrated on 1/26/2021.
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ ❑ ❑ •
Secondary Clarifier Yes No NA NE
Is the clarifier free of black and odorous wastewater? • ❑ ❑ ❑
Is the site free of excessive buildup of solids in center well of circular clarifier? • El El El
Are weirs level? • ❑ El El
Is the site free of weir blockage? • El El El
Is the site free of evidence of short-circuiting? • El ❑ ❑
Is scum removal adequate? • El El El
Is the site free of excessive floating sludge? • ❑ El El
Is the drive unit operational? • El El El
Is the return rate acceptable (low turbulence)? • El ❑ ❑
Is the overflow clear of excessive solids/pin floc? • El El El
Is the sludge blanket level acceptable? (Approximately'/4 of the sidewall depth) • ❑ El El
Page# 5

Permit: NC0043176
Inspection Date: 12/07/2021
Owner - Facility: Dunn WWTP
Inspection Type: Bioassay Compliance
Secondary Clarifier Yes No NA NE
Comment: The sludge blanket was measured at two of three secondary clarifiers. Sludge level
was 0.5 ft. in the 10 ft. clarifier and 3 ft. in the 12 ft. clarifier.
Aerobic Digester Yes No NA NE
Is the capacity adequate? ■ ❑ ❑ El
Is the mixing adequate? El El • El
Is the site free of excessive foaming in the tank? ❑ El • ❑
# Is the odor acceptable? • El El El
# Is tankage available for properly waste sludge? • El ❑ ❑
Comment: The aerobic digestor was empty at the time of inspection except for water sufficient
enough to cover the diffusers.
Solids Handling Equipment Yes No NA NE
Is the equipment operational? • El El El
Is the chemical feed equipment operational? • El El El
Is storage adequate? • El El El
Is the site free of high level of solids in filtrate from filter presses or vacuum filters? • ❑ ❑ ❑
Is the site free of sludge buildup on belts and/or rollers of filter press? ■ ❑ ❑ ❑
Is the site free of excessive moisture in belt filter press sludge cake? • El El ❑
The facility has an approved sludge management plan? • El El El
Comment: Solids handling equipment is torn down and cleaned every 6 weeks. Sludge is hauled
off by Granville Farms.
Dryinq 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: The drying beds have not been used for several years.
Yes No NA NE
❑ ❑ • ❑
❑ ❑ • ❑
❑ ❑ • ❑
Page# 6

Permit: NC0043176
Inspection Date: 12/07/2021
Owner - Facility: Dunn WWTP
Inspection Type: Bioassay Compliance
Disinfection -Gas
Are cylinders secured adequately?
Are cylinders protected from direct sunlight?
Is there adequate reserve supply of disinfectant?
Is the level of chlorine residual acceptable?
Is the contact chamber free of growth, or sludge buildup?
Is there chlorine residual prior to de -chlorination?
Does the Stationary Source have more than 2500 Ibs of Chlorine (CAS No.
7782-50-5)?
If yes, then is there a Risk Management Plan on site?
If yes, then what is the EPA twelve digit ID Number? (1000- - )
If yes, then when was the RMP last updated?
Comment:
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
❑ ❑ • ❑
De -chlorination Yes No NA NE
Type of system ? Liquid
Is the feed ratio proportional to chlorine amount (1 to 1)? • ❑ ❑ ❑
Is storage appropriate for cylinders? • El El El
# Is de -chlorination substance stored away from chlorine containers? • ❑ ❑ ❑
Comment:
Are the tablets the proper size and type?
Are tablet de -chlorinators operational?
Number of tubes in use?
Comment:
• ❑ ❑ ❑
Pump Station - Effluent Yes No NA NE
Is the pump wet well free of bypass lines or structures? • ❑ ❑ ❑
Are all pumps present? • ❑ ❑ ❑
Are all pumps operable? ■ ❑ ❑ ❑
Are float controls operable? • ❑ ❑ ❑
Is SCADA telemetry available and operational? • ❑ ❑ ❑
Is audible and visual alarm available and operational? ❑ El • El
Comment:
Page# 7

Permit: NC0043176
Inspection Date: 12/07/2021
Owner - Facility: Dunn WWTP
Inspection Type: Bioassay Compliance
Effluent Pipe
Is right of way to the outfall properly maintained?
Are the receiving water free of foam other than trace amounts and other debris?
If effluent (diffuser pipes are required) are they operating properly?
Comment:
Flow Measurement - Effluent
# Is flow meter used for reporting?
Is flow meter calibrated annually?
Is the flow meter operational?
(If units are separated) Does the chart recorder match the flow meter?
Comment:
Laboratory
Are field parameters performed by certified personnel or laboratory?
Are all other parameters(excluding field parameters) performed by a certified lab?
# Is the facility using a contract lab?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0
degrees Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees?
Yes No NA NE
• ❑ ❑ ❑
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
Yes No NA NE
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
• ❑ ❑ ❑
▪ El El El
Comment: The plant analyses fecal coliform, ammonia, and field parameters in-house. Other
testing is contracted to Environment One.
Page# 8

DocuSign Envelope ID: 2668A044-AA8B-40A4-9D65-5B747FD2E910
Division of Water Resources
December 21, 2021
MEMORANDUM
To: Mark Brantley
Water Quality Regional Operations, FRO
Through: Cindy A. Moor CM
Supervisor, Aqua lc o&cology Branch (ATB)
From: Lorimar S. Hennin Pik
Environmental Specia is II, Aquatic Toxicology Branch (ATB)
Subject: Whole effluent toxicity test results
Dunn/Blackriver WWTP
NPDES Permit # NC0043176/001
Harnett County
The aquatic toxicity test using constant time/constant volume composite samples of effluent
discharged from the Dunn/Blackriver WWTP has been completed. Dunn/Blackriver WWTP has a
permitted effluent discharge of 3.75 million gallons per day (MGD) entering Cape Fear River
(7010 of 586.6 CFS). Whole effluent samples were collected on December 7 and December 9 by
Stephanie Zorio for use in a chronic Ceriodaphnia dubia pass -fail toxicity test. The test passed.
Toxicity test information follows.
Test Type 3-Brood Ceriodaphnia dubia chronic pass -fail
Test Result Pass
Test Concentrations 1%
Control Survival 100%
Control Mean Reproduction 33.4 neonates
Test Treatment Survival 100%
Treatment Mean Reproduction 32.6 neonates
First Sample pH 6.52 SU
First Sample Conductivity 493 micromhos/cm
First Sample Total Residual Chlorine <0.2 mg/L
Second Sample pH 6.38 SU
Second Sample Conductivity 448 micromhos/cm
Second Sample Total Residual Chlorine <0.2 mg/L
Test results for the above samples indicate that the effluent would not be predicted to have
water quality impacts. These samples were split and tested by Environmental Testing Solutions,
Inc. (ETS). The chronic Ceriodaphnia dubia pass/fail test run by ETS resulted in a pass. Please
contact us if you have any questions or if further effluent toxicity monitoring is desired. We may
be reached at [e-mail] and [e-mail].
Basin: Cape Fear
cc: Stephanie Zorio (FRO)

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: Dunn WWTP
Regional Plant Inspector: Stephanie Zorio
Permit #: NC0043176
Regional Inspector Contact #: 919-368-6077
Field Lab Certification #: 115
Region:FRO
Lab Contact: Donrie Dukes
Date: 12/7/2021
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)
General Laboratory (note any exceptions in section XI
Are instruments, meters, probes, photometric cells, etc. maintained in good condition?
/1 Yes ❑ No
Are standards, reagents and consumables used within manufacturer expiration dates?
[TRC gel standard is exempt.]
Yes
❑ No
Are the following items documented ( \I where applicable):
Item
TRC
pH
TEMP
DO
SC
SETT
Date of sample collection*
X
X
X
X
NA
NA
Time of sample collection*
X
X
X
X
NA
NA
Sample collector's initials or signature
X
X
X
X
NA
NA
Date of sample analysis*
X
X
X
X
NA
NA
Time of sample analysis*
X
X
X
X
NA
NA
Analyst initials or signature
X
X
X
X
NA
NA
Sample site (i.e., facility name, location, ID, etc.)
X
X
X
X
NA
NA
Instrument ID
X
X
X
X
NA
NA
Parameter
X
X
X
X
NA
NA
Data qualifiers, when required
NA
NA
NA
NA
NA
NA
*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 DR4000V
Is a check standard analyzed each day of use? (Circle one: gel or liquid standard)
r Yes
❑ No
Does the check standard recover within ±10% of the known value?
r Yes
❑ No
What is the assigned/observed value of the daily check standard? 185
Is a 5-standard calibration verification performed? Note date of last verification:
❑ Yes
r No
Alternatively, does the lab construct a linear regression, using 5 standards, to calculate
results? Note date of last calibration curve constructed: 6/29/2021
❑ No
r Yes
True values: r pg/L ❑ mg/L 20 100 50 200 400
Obtained values: r pg/L ❑ mg/L 18 98 52 203 405
What program are samples analyzed on? 1490
Are results reported in proper units? Check one: r pg/L ❑ mg/L
/1 Yes
❑ No
Are results reported between the facility's permit limit and the compliance limit of 50 pg/L?
/1 Yes
❑ No
Are results less than the low standard reported as "<x", where x=low standard conc.?
/1 Yes
❑ No
Is DPD/buffer added within 15 minutes of collection?
/1 Yes
❑ No
Is a post -analysis check standard analyzed if samples are analyzed at multiple sites? NA
❑ Yes
❑ No
IV. pH — reference method:
pH meter manufacturer and model: Orion 01929 Accumet pH probe
Is the pH meter calibrated with at least 2 buffers per mfg's instructions each day of use?
Note buffers used: 4, 7, 10
❑ No
Yes
Is the pH meter calibration checked with an additional buffer prior to sample analysis?
Note check buffer used: 7
❑ No
Yes
Does the check buffer read within ±0.1 S.U. of the known value?
r Yes
❑ No
Are the following items documented:
Meter calibration?
/1 Yes
❑ No
Check buffer reading(s)?
r Yes
❑ No
Are samples analyzed within 15 minutes of collection?
/1 Yes
❑ No

Are sample results reported to 0.1 pH units on the eDMR?
/1 Yes
❑ No
Is a post -analysis check buffer analyzed if samples are analyzed at multiple sites? NA
❑ Yes
❑ No
V. Temperature — reference method:
What instrument(s) is used to measure temperature? Check all that apply: /1 pH meter
DO meter Conductivity meter ❑ Digital thermometer ❑ Glass thermometer
Is the instrument/thermometer calibration checked at least annually against a NIST
traceable thermometer?
❑ No
r Yes
Is NIST traceability documentation maintained on site? *see comments
❑ Yes
r No
Are samples measured within 15 minutes?
r Yes
❑ No
Are sample results reported in degrees C?
r Yes
❑ No
VI. Dissolved Oxygen — reference method:
DO meter make and model: Hach 10360-2011
Is the air calibration of the DO meter performed each day of use?
r Yes
❑ No
Is meter calibration documented?
r Yes
❑ No
Are samples analyzed within 15 minutes of collection?
/1 Yes
❑ No
Are results reported in mg/L?
/1 Yes
❑ No
If samples are analyzed at multiple sites, is the meter recalibrated at each site or a post -
analysis calibration verification performed? NA
Yes
❑ No
Does the post -analysis verification theoretical value agree within 0.5 mg/L of the meter
calibration reading? NA
❑ Yes
❑ No
VII. Conductivity — reference method:
NA
Conductivity meter make and model:
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
VIII. Settleable Residue — reference method:
NA
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: Jan., Feb. 2020
r Yes
❑ No
X. Is follow-up by the Laboratory Certification program recommended?
❑ Yes
XI. Additional comments: DO temperature is calibrated with an NIST thermometer kept at the public water
plant. Staff sent documentation that the NIST thermometer was last calibrated in 2019.
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 [e-mail].
Revision 3/2021