NC0043176_Biomonitoring Inspection_20080320

0 w H rF'9
OYK
March 20, 2008
Mr. Dean Gaster
Public Utilities Director
City of Dunn
P.O. Box 1065
Dunn, NC 28335
SUBJECT: Compliance Biomonitoring Inspection
City of Dunn Black River
Wastewater Treatment Plant (WWTP)
NPDES Permit No. NC0043176
Harnett County
Dear Mr. Gaster:
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sull'ins., Director
Division of Water Quality
Enclosed you will find a copy of the Compliance Biomonitoring Inspection report
for the inspection conducted the. week of February 25, 2008. The inspection included
the same objectives as that of a routine Compliance Inspection (conducted on. the same
day) plus an Aquatic Toxicity (AT) test to evaluate the biological effect of the facility's
discharge on test organisms. As part of the inspection, a tour of the Wastewater
Treatment Plant was .conducted. All observations and recommendations are in Part D.
Summary of Findings/Comments of this inspection report. A whole effluent sample was
collected at Outfall 001 from the 24-hour composite of February 26 and February 29 for
use in a chronic Ceriodaphnia dubia pass/fail toxicity test. This sample was sent to the
Division of Water Quality (AT) Laboratory (located on Reedy Creek Road in Raleigh).
The Whole Effluent Toxicity pass/fail test results using these samples resulted in a
"Pass". Test results for these samples indicate that the effluent would not be predicted
to have water quality impacts on receiving water. The plant\ effluent composite sample
that was taken by DWQ-FRO at the Dunn/Black River WWTP Outfall 001 during the
time period of 11:00 AM on February 25 to 11:00 AM on February 26 were analyzed for
the following parameters (which are currently in your NPDES Permit): Biochemical
Oxygen Demand (BOD), Ammonia Nitrogen, Total Nitrogen (Nitrate-N plus Nitrite-N
plus Total Kjeldahl-Nitrogen). The chemistry analyses were sent to the Division of
Water Quality Chemistry Laboratory, located on Reedy Creek Road in Raleigh. The
results of these chemistry parameters are as follows: Biochemical Oxygen Demand
(BOD) = 6.0 mg/L, Total Phosphorus = 0.95 mg/L, Ammonia Nitrogen = 3.3 mg/L, the
Nitrate-N plus Nitrite-N = 0.20 mg/L, and the Total Kjeldahl-Nitrogen = 3.8 mg/L).
One
North Carolina
Naturally
North Carolina Division of Water Quality 225 Green Street — Suite 714 Fayetteville, NC 28301-5043 Plione [phone] Customer Service
Internet: h2o.enr.state.nc.us FAX [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper

Mr. Gaster
March 20, 2008
Page 2 •
It is recommended that flow paced dosage of chlorine and sulfur dioxide be
installed at the wastewater treatment plant. There may be long-term cost savings
realized by the Dunn/Black River Wastewater Treatment Plant in the use of flow
proportional dosage equipment for chlorine and sulfur dioxide. The reason is that during
low flow conditions that occur during the evening hours, the dosage of the chlorine and
the sulfur dioxide would automatically be reduced, and the optimum dosage would be
maintained throughout the day and night.
Please sample for Fecal Coliforms at the Plant Outfall 001 Effluent rather than at
the end of the chlorine contact chamber, as presently being performed. It is
recommended that the pH electrode be reconditioned or replaced because the electrode is
now reading +28.2 mV when the electrode is in a 7.0 pH buffer. Please note that the pH
meter should be read close to zero millivolts when the electrode is in a 7 pH buffer. It is
recommended that the Dissolved Oxygen meter electrode be located inside of a water
saturated air chamber during calibration and that an altitude adjustment be implemented
(please compare the meter's readings to the enclosed chart that has been corrected for 157
feet elevation at the Dunn/Black River WWTP).
We appreciate the cooperation of Donrie Dukes (ORC) and your staff at the
WWTP.. The WWTP appears to be well maintained. Keep up the good work.
- If you have any questions or comments concerning this report or require
clarification on part(s) of this report, please contact me at [phone].
Dale Lopez
Environmental Speci� as 1st
/dl
Enclosure: EPA Water Compliance Inspection Report
Regional Field Inspectors Check List for Field Parameters
Dissolved Oxygen Table (adjusted to 157 feet for the Dunn/Black River WWTP)
cc: FRO Files

United States Environmental Protection Agency
Washington, D.C. 20460
EPA
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 NPDES yr/mo/day
1 INI 2 151 31 NC0043176 111 121 08/02/25 117
Inspection Type Inspector Fac Type
18181 191s1 201 11
I I I I I I I I I I I I I I I I66
Remarks
2.11 I I I I I) 1 I► I I I I I I I I I. I I I I I I I I I I I I
Inspection Work Days - Facility Self -Monitoring Evaluation Rating B1 QA - Reserved
671 4.0 1 69 701 41 711 DI 721 N I . 731 I 174 9 I I I I 1 I -I 80
_ Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
POTW name and NPDES permit Number)
Dunn WWTP
Susan Tart Rd
Dunn NC 28335
Entry Time/Date
10:30 AM 08/02/25
Permit Effective Date
07/02/01
Exit Time/Date
04:00 PM 08/02/25
Permit Expiration Date
11/09/30
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
///
Donrie Eldridge Dukes/ORC/9.10-892-8162/
Other facility Data
Name, Address of Responsible Official/Title/Phone and Fax Number
Ronald D Autry,PO Box 1065 Dunn NC 28335/7910-892-2633/ Contacted
No
Section C: Areas Evaluated During Inspection (Check only those areas evaluated)
Permit Flow Measurement 1 Operations & Maintenance Records/Reports
Self -Monitoring Program Facility Site Review Effluent/Receiving Waters 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
• ,'
Dale pe� FRO WQ//910-433-3300 Ext.712/ t.712/
a^�`p` C!dLf.
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
•
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page # 1

31
NPDES
NCO043176
11 121
yr/mo/day
08/02/25
17
Inspection Type
18IBI
(cont.) 1
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
Five days per week (on weekdays), the Dissolved Oxygen and the Temperature are performed at the last
manhole before the treated wastewater effluent reaches the Cape Fear River. It is recommended that flow
paced dosage of chlorine and sulfur dioxide be installed at the wastewater treatment plant. There may be
long-term cost savings realized by the Dunn/Black River Wastewater Treatment Plant in the use of flow
proportional dosage equipment for chlorine and sulfur dioxide. The reason for the savings is that during
low flow conditions that occur during the evening hours, the dosage of the chlorine and the sulfur dioxide
would automatically be reduced, and the optimum dosage would be maintained throughout the day and
night. Please sample for Fecal Coliforms at the Plant Outfall 001 instead of at the end of the chlorine
contact chamber (as is presently being sampled). An upgrade to the wastewater treatment plant is being
planned for the year 2013. The Fisher Scientific pH meter Model AR-50 millivolt reading of the electrode
with the 7 pH buffer was +28.2 mV. The 7.0 pH buffer should read zero mV (or close to zero mV). It is
recommended that the electrode be reconditioned or replaced with a new pH electrode. The Dissolved
Oxygen Meter was not calibrated using the altitude adjustment. It is recommended that the YSI model 52
Dissolved Oxygen meter be calibrated daily using the altitude adjustment (please see the enclosed
Dissolved Oxygen chart to be used for comparison between the Dissolved Oxygen meter reading on water
saturated air calibration as compared to the chart at the same temperature). It was observed that the
electrode is taken from the water saturated air bottle and placed upon the table top to exposed it to the
ambient air when calibrating the Dissolved Oxygen meter. Please calibrate the Dissolved Oxygen meter in a
water saturated air chamber (as according to the manufacturer's directions).
Page # 2

Permit: NC0043176 Owner- Facility: Dunn WWTP
Inspection Date: 02/25/2008 Inspection Type: Bioassay Compliance
Operations & Maintenance Yes No NA NE
Is the plant generally clean with acceptable housekeeping? ■ n n n
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable Solids, pH, DO, Sludge ■ n n n
Judge, and other that are applicable?
Comment:
Permit Yes No, NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new application? n n ■ n
Is the facility as described in the permit? 0 n n n
# Are there any special conditions for the permit? • n f 1 n '
Is access to the plant site restricted to the general public? ■ ❑ n ❑
Is the inspector granted access to all areas for inspection? ■ n n n
Comment:
Effluent Pipe Yes No NA NE
Is right of way to the outfall properly maintained? • ❑ ❑ - n
Are the receiving water free of foam other than trace amounts and other debris? ■ n n n
If effluent (diffuser pipes are required) are they operating properly? n n ■ n
Comment:
Flow Measurement - Effluent Yes No NA NE
# Is flow meter used for reporting? ■ n n n
Is flow meter calibrated annually? ■ n n ❑
Is the flow meter operational? - ■ ❑ ❑ ❑
(If units are separated) Does the chart recorder match the flow meter? ■ . ❑ n n
Comment:
Pump Station - Effluent Yes No NA NE
Is the pump wet well free of bypass lines or structures? ■ ❑ n ❑
Are all pumps present? ■ n n n
Are all pumps operable? ._ • n n n
Are float controls operable? ■ n n n
Is SCADA telemetry available and operational? - - ■ ❑ n ❑
Is audible and visual alarm available and operational? • ❑ ❑
Comment:
Page # 3

Permit: NC0043176 Owner - Facility: Dunn WWTP
Inspection Date: 02/25/2008 Inspection Type: Bioassay Compliance
Bar Screens
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:
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?
yIs the sludge blanket level acceptable? (Approximately'/< of the sidewall depth)
Comment: #2 Clarifier has two places that appears to have more flow than the rest of
the same clarifier.
Aeration Basins
Mode of operation
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?
Yes No NA NE
■
■
■ nnn
■ nnn
■ nnn
■ nnn
Yes No NA NE
■ nnn
■ nnn
■ nnn
■ nnn
n■nn
■ nnn.
■ nnn
■ nnn
■ nnn
■ nnn
■ nnn
Yes No NA NE
Ext. Air
Diffused
■ nnn
nn■n
■ n.nn
■ nnn
■ nnn
Page # 4

•
Permit: NC0043176 Owner- Facility: Dunn WWTP
Inspection Date: 02/25/2008 Inspection Type: Bioassay Compliance
Aeration Basins
Is the DO level acceptable?
Is the DO level acceptable?(1.0 to 3.0 mg/I)
Comment:
Disinfection -Gas
Are cylinders secured adequately?
• t
Are cylinders protected from direct sunlight?
Is there adequate reserve supply of disinfectant?
Is the level of chlorine residual acceptable?
r
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: The chlorine dosage rate is not based upon the flow.
De -chlorination
Type of system ?
Is the feed ratio proportional to chlorine amount (1 to 1)?
Is storage appropriate for cylinders?
# Is de -chlorination substance stored away from chlorine containers?
Are the tablets the proper size and type?
Comment: The sulfur dioxide gas dosage rate is not based on the effluent flow.
Are tablet de -chlorinators operational?
Number of tubes in use?
Comment:
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?
Yes No NA NE
n nri•
•nnn■
Yes No NA NE
n n■n
n n■n
■ nnn
■ nnn
■ nnn
n nn■
n nn■
n nn■
Yes No NA NE
Gas
n nn'■
.nnn
■ nnn
n n■n
n n■n
Yes No NA NE
■ nnn
■ nnn
■ nnn
n ■nn
Page # 5

Permit: NC0043176 Owner- Facility: Dunn WWTP
Inspection Date: 02/25/2008 Inspection Type: Bioassay Compliance
Standby Power
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?
Comment: The generator runs every Monday at approximately 1 PM for one hour.
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 1.0 to 4.4 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?
Comment: When calibrating the dissolved oxygen meter, the operator does not make
an adjustment for an altitude of 157 feet elevation. Included with this report is a chart
that has been corrected for elevation of 157 feet above sea -level.
Effluent Sampling
Is composite sampling Flow proportional?
Is sample collected below all treatment units?
Is proper volume collected?
Is the tubing clean?
Is proper temperature set for sample storage (kept at 1.0 to 4.4 degrees Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type representative)?
Comment: On the five weekdays, the Plant Effluent 001 Dissolved Oxygen and
Temperature are preformed at the manhole near the Cape Fear River. However, on
the weekends, the Temperature is performed at the designated Plant Effluent 001.
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
Yes No NA NE
■ nnn
n■nEl
■ nnn
Yes No NA NE
■ nnn
■ nnn
■nnn
■ nnn
■ nnn
nin■n
Yes No NA NE
■ nnn
▪ El El
■ nnn
■ nnn
■ nnn
■ nnn
Yes No NA NE
■ nnn
■ nnn
■ nnn
■ nnn
■ nnn
Page # 6

Permit: NC0043176 Owner -Facility: Dunn•WWTP
Inspection Date: 02/25/2008 Inspection Type: Bioassay Compliance
Record Keeping Yes No NA NE
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? snnn
Has the facility submitted its annual compliance report to users and DWQ? ■ . ❑ . n n
(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator on each shift? n n ■ n
Is the ORC visitation log available and current? ■ n ❑ ❑
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? ■ n n n
Is a copy of the current NPDES permit available on site? ■ ❑ n ❑.
Facility has copy of previous year's Annual Report on file for review? ■ n n n
Comment:
Flow Measurement - Influent Yes No NA NE
# Is flow meter used for reporting? n ■ n n
Is flow meter calibrated annually? ■ n n ❑
Is the flow meter operational?. ■ n ❑ ❑
(If units are separated) Does the chart recorder match the flow meter? ❑ ❑ •
Comment: The effluent flow. meter is used for the DMR reporting.
Page # 7

Regional Field Inspectors Check List for Field Parameters
Name of site to be Inspected: Dunn WWTP Date: 02/26/ ..,
Field certification # (if applicable): / ! 5 Inspector: Dale Lopez
NPDES #: NC0043176 Region: Fayetteville
I. Circle the parameter or parameters performed at this site.
Residual Chlorine
II. Instrumentation:
Settleable Solids, ®H, IDO, Conductivity,
Temperature
A. Does the facility have the equipment necessary to analyze field parameters as circled above?
1. A pH meter
Fischer AR 50
2. A Residual Chlorine meter
3. DO meter
4. A Cone for settleable solids
5. A thermometer or meter that measures temperature.
MACH DR-4000
[YSI 52
6. Conductivity meter
III. Calibration/Analysis:
1. Is the pH meter calibrated with 2 buffers and
checked with a third buffer each day of use?
2. For Total Residual Chlorine, is a check standard
analyzed each day of use?
3. Is the air calibration of the DO meter performed
each day of use?
4. For Settleable Solids, is 1 liter of sample
settled for 1 hour?
5. Is the temperature measuring device calibrated
annually against a certified thermometer?
[Yes
1Yes
[Yes
Yes
[Yes
No
No
No
No
No
Yes No
'Yes
Yes
Yes
Yes
[Yes
6. For Conductivity, is a calibration standard
analyzed each day of use? Yes
No
No
No
No
No

IV. Documentation:
1. Is the date and time that the sample was collected documented?
2. Is the sample site documented?
3. Is the sample collector documented?
4. Is the analysis date and time documented?
5. Did the analyst sign the documentation?
6. Is record of calibration documented?
7. For Settleable Solids, is sample volume and
1 hour time settling time documented?
8. For Temperature, is the annual calibration of
the measuring device documented?
Comments:
[Yes
fYes
Yes
IYes
Yes
IYes
Yes
Yes
Please submit a copy of this completed form to the Laboratory Certification Program.
DWQ Lab Certification
Chemistry Lab
Courier # 52-01-01
FIELD INSPECTOR CHECKLIST REV. 04/23/2002

, DNNNN/BN ACK RIVER WWffPDissolved Oxygen (D.O.) TABLE
'
Barometric Pressure (BP) =
755 nnmn Mg
Q
14.5
14.5
14,4
14.4
14.4
14.3
143
14.2
14.2
14.2 -
- -0
2
13.7
137
13.7
13.6
13.6
13.6
13.5
13.5
13.4
'1��4
-- - - -'
4
13.0
13.0
13.0
129
12.8
12.9
12.8
12.8
12.8
12.7
-' - 4- -
G
12/4
12.3
12.3
12.3
12.2
12.2
12.2
122
12.1
--
12.1
------
- -n--
8
11.8
11.7
11.7
117
11.7
11.6
11.6
11.6
11.5
11.5
10
11-2
112
112
11.111.1
11.1
11.111.0
11.0
11.0
'0 --
as
12
10.7
10.7
107
10.8
10.6
10.8
10.6
10.5
105
. 10.=
-'1 !
14
10-2
10.2
10.2
10.2
10]
10.1
10.1
10.1
10.1
10.0
14'' -
16
9.8
9.8
9.8
9.7
9.7
97
97
8.7
9.6
9.'
1- - -8' --
-18-''
18
9'4
9.4
8.4
8.3
9.3
9.3
9.3
9.3
9.3
9.2
%
20
9.0
9.0
9.0
9.0
9.0
8.9
8.9
8.8
8.9
8.9
20
22
87
8.7
8.7
8.6
8.6
8.0
8.0
8.0
8.6
8.5
22
24
8.4
8.3
8.3
8.3
8.3
8.3
8.3
8.3
'8.2
8.2
24
26
8.1
8.0
8.0
8.0
8.0
8.0
8.0
8.0
7.9
7.9
2
28
7.8
7.8
7.7
7.7
7.7
7.7
77
7.7
7.7
77
28
17
30
7.5
7.5
7.5
7.5
7.5
7.4
7'4
7.4
7'4
7.4
38
32
7.3
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.2
7.1
--2-
M---
34
7.0
7.0
7.0
7.0
7.0
7.0
0.9
0.9
8.9
6.9 -
- 34
Dunn/Black River mWr
oxmnc000

Mdlinteir 15-17-47.14--N 78-38-14.11- W eley' 157ft