NC0043176_Site Visit_20160411

State of North Carolina
Division of Water Resources
Water Quality Regional Operations Section
Environmental Staff Report
(,duality
To: ®NPDES Unit ❑Non-Discharge Unit Application No.: NCO043176
Attn: Tom Belnick Facility name: City of Dunn WWTP
(Black River WWTP)
From: Mark Brantley,Environmental Program Consultant
Fayetteville Regional Office
Note: This form has been adapted from the non-discharge facility staff report to document the review of both non-
discharge and NPDES permit applications and/or renewals. Please complete all sections as they are applicable.
I. GENERAL AND SITE VISIT INFORMATION RECEIVEDUDEWWR
1. Was a site visit conducted? ® Yes or❑No APR 1 112016
a. Date of site visit: 3-16-2016 Water Quality
b. Site visit conducted by: Mark Brantley Permitting Section
c. Inspection report attached? ® Yes or❑No
d. Person contacted: Donrie Dukes and their contact information: (910) 892 - 2935
e. Driving directions: Facility is located at 580 JW Edwards Lane, Dunn,NC 28334
2. Discharge Point(s):
Latitude: Longitude:
Latitude: Longitude:
3. Receiving stream or affected surface waters:
Classification: Class WS-V
River Basin and Subbasin No. Cape Fear River Basisn 03-06-13
Describe receiving stream features and pertinent downstream uses:
• The main stem of the Cape Fear River at this point is used primarily for fish and wildlife
propagation, fishing and boating. The City of Fayetteville has a water intake
approximately 20 miles downstream. Access to this stretch of the river is limited.
H. PROPOSED FACILITIES: NEW APPLICATIONS
1. Facility Classification: (Please attach completed rating sheet to be attached to issued permit)
Proposed flow:
Current permitted flow:
2. Are the new treatment facilities adequate for the type of waste and disposal system? ❑ Yes or❑No
If no, explain:
3. Are site conditions(soils, depth to water table, etc) consistent with the submitted reports? ❑ Yes ❑No ❑N/A
If no, please explain:
FORM: WQROSSR 04-14 Page 1 of 4

,r
4. Do the plans and site map represent the actual site(property lines, wells, etc.)? ❑ Yes ❑No ❑N1A
If no, please explain:
5. Is the proposed residuals management plan adequate? ❑ Yes ❑No ❑N/A
If no, please explain:
6. Are the proposed application rates(e.g., hydraulic, nutrient)acceptable? ❑ Yes ❑No ❑N/A
If no, please explain:
7. Are there any setback conflicts for proposed treatment, storage and disposal sites? ❑ Yes or❑No
If yes, attach a map showing conflict areas.
8. Is the proposed or existing groundwater monitoring program adequate? ❑ Yes ❑No ❑N/A
If no, explain and recommend any changes to the groundwater monitoring program:
9. For residuals, will seasonal or other restrictions be required? ❑ Yes ❑No ❑N/A
If yes, attach list of sites with restrictions(Certification B)
Describe the residuals handling and utilization scheme:
10. Possible toxic impacts to surface waters:
11. Pretreatment Program (POTWs only):
III.EXISTING FACILITIES: MODIFICATION AND RENEWAL APPLICATIONS
1. Are there appropriately,certified Operators in Charge (ORCs) for the facility? ® Yes ❑No ❑N/A
ORC: Donrie Dukes Certificate#: 990418 Backup ORC: Dishon Allen Certificate#:991135
2. Are the design, maintenance and operation of the treatment facilities adequate for the type of waste and disposal
system? ® Yes or❑No
If no, please explain: *Please see inspection report comment on the need to begin planning,for upgrades to
existing system.
Description of existing facilities: Please see attached narrative describing the facility. Narrative was provided by
City of Dunn.
Proposed flow:
Current permitted flow: 3.75 MGD
Explain anything observed during the site visit that needs to be addressed by the permit, or that may be important
for the permit writer to know(i.e., equipment condition, function, maintenance, a change in facility ownership,
etc.)
3. Are the site conditions (e.g., soils,topography, depth to water table, etc)maintained appropriately and adequately
assimilating the waste? ❑ Yes or❑No
If no, please explain:
4. Has the site changed in any way that may affect the permit(e.g., drainage added, new wells inside the compliance
boundary, new development, etc.)? ❑ Yes or®No
If yes, please explain:
5. Is the residuals management plan adequate? ® Yes or❑No
If no, please explain:
6. Are the existing application rates(e.g., hydraulic, nutrient) still acceptable? ❑ Yes or❑No
If no, please explain:
7. Is the existing groundwater monitoring program adequate? ❑ Yes ❑No ®N/A
If no, explain and recommend any changes to the groundwater monitoring program:
8. Are there any setback conflicts for existing treatment, storage and disposal sites? ❑ Yes or®No
If yes, attach a map showing conflict areas.
FORM: WQROSSR 04-14 Page 2 of 4

9. 'Is the description of the facilities as written in the existing permit correct? ® Yes or❑No
If no, please explain:
10. Were monitoring wells properly constructed and located? ❑ Yes ❑No ®N/A
If no, please explain:
11. Are the monitoring well coordinates correct in BIMS? ❑ Yes ❑No ®N/A
If no, please complete the following(expand table if necessary):
Monitoring Well Latitude Longitude
O I 11 O I II
O I „ O I II
12. Has a review of all self-monitoring data been conducted(e.g., DMR,NDMR,NDAR, GW)? ® Yes or❑No
Please summarize any findings resulting from this review:
• In 2014: Two Flow violations that resulted in NOD's
• In 2015: Three Flow violations that resulted in NOV's and
• In 2016 (thru March): Two Flow Violations that have not been addressed. It appears to
be 1 NOV and 1 Civil penalty case.
Provide input to help the permit writer evaluate any requests for reduced monitoring, if applicable.
13. Are there any permit changes needed in order to address ongoing BIMS violations? ❑ Yes or®No
If yes, please explain:
14. Check all that apply:
❑No compliance issues ❑ Current enforcement action(s) ❑ Currently under JOC
®Notice(s) of violation ❑ Currently under SOC ❑ Currently under moratorium
Please explain and attach any documents that may help clarify answer/comments (i.e.,NOV,NOD, etc.)
If the facility has had compliance problems during the permit cycle, please explain the status. Has the RO been
working with the Permittee? Is a solution underway or in place?
Have all compliance dates/conditions in the existing permit been satisfied? ❑ Yes ❑No ®N/A
If no, please explain:
15. Are there any issues related to compliance/enforcement that should be resolved before issuing this permit?
❑ Yes ❑No ®N/A
If yes, please explain:
16. Possible toxic impacts to surface waters:
17. Pretreatment Program(POTWs only):
FORM: WQROSSR 04-14 Page 3 of 4

IV. REGIONAL OFFICE RECOMMENDATIONS '
1. Do you foresee any problems with issuance/renewal of this permit? ❑ Yes or®No
If yes, please explain:
2. List any items that you would like the NPDES Unit or Non-Discharge Unit Central Office to obtain through an
additional information request:
Item Reason
3. List specific permit conditions recommended to be removed from the permit when issued:
Condition Reason
4. List specific special conditions or compliance schedules recommended to be included in the permit when issued:
Condition Reason
5. Recommendation: ❑ Hold, pending receipt and review of additional information by regional office
❑ Hold,pending review of draft permit by regional office
❑ Issue upon receipt of needed additional information
® Issue
❑ Deny(Please state reasons:
6. Signature of report preparer:
Signature of regional supervisor:
Date: 11 114,2
V. ADDITIONAL REGIONAL STAFF REVIEW ITEMS
FORM: WQROSSR 04-14 Page 4 of 4

PAT MCCRORY
Governor
%na
DONALD R. VAN DER VAART
Secretary
WaterResources S. JAY ZIMMERMAN
ENVIRONMENTAL QUALITY
Director
March 29, 2016
Ronald D Autry
City of Dunn
PO Box 1065
Dunn,'NC 28335
RECEIVEDINCDEWNR
SUBJECT: 3/16/2016 Compliance Evaluation Inspection
City of Dunn APR 1 i 2016
Dunn WWTP Water Quality
Permit No: NC0043176, Permitting Section
Harnett County
Dear Mr. Autry:
Enclosed please find a copy of the Compliance Evaluation Inspection form from the inspection
conducted on 3/16/2016. The Compliance Evaluation Inspection was conducted by Mark Brantley,
Environmental Program Consultant, of the Fayetteville Regional Office.The cooperation of Mrs. Donrie
Dukes, Grade IV ORC,was greatly appreciated. The facility was found to be in Compliance with permit
NC0043176. As a reminder, preservation of the Waters of,the State can only be achieved through
consistent NPDES Permit compliance.
Comments
• Facility was clean and neat in appearance at the time of the inspection.
• Maintenance records, ORC log, and operators log were up to date.
• The aeration basin has a significant number of air leaks in the air distribution system. Facility
staff stated that when an air leak was repaired a new leak would be created at the next weakest
spot in the airline. Having a significant amount of air leaks in the system reduces the amount
of air that is delivered to the aeration basin which in turn reduces the efficiency of this
treatment unit. Reduced treatment efficiency can result in a NPDES permit limit violations such
as (but not limited to) Ammonia and BOD. Please remember NPDES permit violations can result
in Notices of Violation and/or Civil Penalty assessments with fines up to$25,000 per day per
.-violation. Significant air leaks can also increase power operating costs because the blower units
will have to work harder to supply the required air to the aeration basins. By having the blower
units working harder this will increase wear and tear on these units which could cause major
repairs to these units. Please consult the town's engineering firm to determine the life
expectancy of the air distribution system since these units were constructed in 1979 and have
had no major repairs or upgrades. The Division of Water Resources strongly encourages the
City of Dunn to begin studying ways to repair or replace the air distribution system. By studying
the system the City would be able to determine how to fund a replacement/repair project and
Fayetteville Regional Office
225 Green Street,Suite 714,Fayetteville,North Carolina 28301-5095
Main Phone: [phone] Internet: hfp:/Avww.ncdenr.gov
An Equal Opportunity 1 Affirmative Action Employer—Made in part by Recycled Paper

r •
Mr.Autry
Page 2
March 29, 2016
also select the best technology to replace the existing air distribution system. Please note
increased flow also increases the demand for air in the aeration basin.
® The Division of Water Resources recognizes that the city has done a lot of work on the City's
Inflow and Infiltration (1/1) problem. However, a records review revealed flow violations for the
months of January, March, November 2015 and January 2106. These violations were caused by
wet weather periods which indicates more work needs to be done to correct the City's 1/1
problem.
o The November 2015 eDMR was compared to the monthly laboratory bench sheets and no
transcription errors were found.
Please refer to the enclosed inspection report for additional observations and comments. If you or your
staff have any questions, please call me at 910-433-3327.
Sincerely,
Mark Brantley,
Environmental Program Consultant
Division of Water Resources
Water Quality Regional Operations Section
cc: Donrie Eldridge Dukes, ORC
Central Files
ayettevil,le�Files

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 1s l 3 I N00043176 I11 12 16/03/16 17 18 ICI 19 1 s 20I
211 II 1 1 1 1 1 1 1 II I I LI I I I I I I I I I I I I I. I I I I I I II I I I I 1166
Inspection Work Days Facility Self-Monitoring Evaluation Rating B1 QA -Reserved —
67 70 1, 1 71
LJ 1it72 J 73 • 74 751 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 Entry Time/Date Permit Effective Date
POTW name and NPDES permit Number) 09 30AM 16/03/16 12/08/01
Dunn WWTP
Susan Tart Rd Exit Time/Date Permit Expiration Date
12-30PM 16/03/16 16/09/30
Dunn NC 28335
Name(s)of Onsite RepresentaLve(s)/Titles(s)/Phone and Fax Number(s) Other Facility Data
Donrie Eldridge Dukes/ORC/910-892-8162/
Name,Address of Responsible Official/Title/Phone and Fax Number
Contacted
Ronald D Autry,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&Maintenance Records/Reports
Self-Monitoring Program Sludge Handling Disposal Facility Site Review 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
Mark Brantley FRO WQ//910-433-3300 Ext.727/
1%"4 '0,4` -
Signature of Management Q A Reviewer Agency/Office/Phone and Fax Numbers Date
li a,S Henson 1 G RO WQ//910-433-3300 Ext.72E 3
ti •J �✓RJC E
EPA Form 3560-3(Rev 9-94)Previous editions are obsolete.
Page# 1

s
NPDES yr/mo/day Inspection Type (Cont.)
31 N00043176 I11 121 16/03/16 117 18 1 C
Section D:Summary of Finding/Comments(Attach additional sheets of narrative and checklists as necessary)
Comments
-Facility was clean and neat in appearance at the time of the inspection.
-Maintenance records, ORC log, and operators log were up to date.
-The aeration basin has a significant number of air leaks in the air distribution system. Facility staff
stated that when an air leak was repaired a new leak would be created at the next weakest spot in the
air line. Having a significant amount of air leaks in the system reduces the amount of air that is
delivered to the aeration basin which in turn reduces the efficiency of this treatment unit. Reduced
treatment efficiency can result in a NPDES permit limit violations such as(but not limited to)Ammonia
and BOD. Please remember NPDES permit violations can result in Notices of Violation and/or Civil
Penalty assessments with fines up to$25,000 per day per violation. Significant air leaks can also
increase power operating costs because the blower units will have to work harder to supply the
required air to the aeration basins.-By having the blower units working harder this will increase wear
and tear on these units which could cause major repairs to these units. Please consult the town's
engineering firm to determine the life expectancy of the air distribution system since these units were
constructed in 1979 and have had no major repairs or upgrades. The Division of Water Resources
strongly encourages the City of Dunn to begin studying ways to repair or replace the air distribution
system. By studying the system the City would be able to determine how to fund a replacement/repair
project and also select the best technology to replace the existing air distribution system. Please note
increased flow also increases the demand for air in the aeration basin.
-The Division of Water Resources recognizes that the city has done a lot of work on the City's Inflow.
and Infiltration (1/1) problem. However, a records review revealed flow violations for the months of
January, March, November 2015 and January 2106. These violations were caused by wet weather
periods which indicates more work needs to be done to correct the City's III problem.
-The November 2015 eDMR was compared to the monthly laboratory bench sheets and no
transcription errors were found.
Page# 2

Permit: NCO043176 Owner-Facility: Dunn WWTP
Inspection Date: 03/16/2016 Inspection Type: Compliance Evaluation
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, MCRT, Settleable M ❑ ❑ ❑
Solids, pH, DO, Sludge 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 0 ❑ ❑ ❑
application?
Is the facility as described in the permit? M ❑ ❑ ❑
#Are there any special conditions for the permit? ❑ ❑ M ❑
Is access to the plant site restricted to the general public? M. ❑ ❑ ❑
Is the inspector granted access to all areas for inspection? 0 ❑ ❑ ❑
Comment:
Record Keeping Yes No NA NE
Are records kept and maintained as required by the permit? R ❑ ❑ ❑
Is all required information readily available, complete and current? M ❑ ❑ ❑
Are all records maintained for 3 years(lab. reg. required 5 years)? ❑ ❑ ❑
Are analytical results consistent with data reported on DMRs? M, ❑ ❑ ❑
Is the chain-of-custody completes M ❑ ❑ ❑
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 CDCs
Are DMRs complete:do they include all permit parameters? 0 ❑ ❑ ❑
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 ❑ ❑ M El
on each shift?
Is the ORC visitation log available and current? M ❑ ❑ ❑
Is the ORC certified at grade equal to or higher than the facility classification? M ❑ ❑ ❑
Is the backup operator certified at one grade less or greater than the facility classification? M ❑ ❑ ❑
Is a copy of the current NPDES permit available on sites 0 ❑ ❑ ❑
Page# 3

� a
Permit: NC0043176 Owner-Facility: DunnWwTP
Inspection Date: 03/16/2016 Inspection Type: Compliance Evaluation
Record Keeping Yes No NA NE
Facility has copy of previous year's Annual Report on file for review? ❑ ❑ ❑
Comment:
Flow Measurement-Effluent Yes No NA NE
#Is flow meter used for reporting? M ❑ ❑ ❑
Is flow meter calibrated annually? M ❑ ❑ ❑
Is the flow meter operational? M ❑ ❑ ❑
(If units are separated)Does the chart recorder match the flow meter? ❑ ❑ ❑
Comment:
Aerobic Digester Yes No NA NE
Is the capacity adequate? M ❑ ❑ ❑
Is the mixing adequate? ❑ ❑ ❑
Is the site free of excessive foaming in the tank? M ❑ ❑ ❑
#Is the odor-acceptable? M ❑ ❑ ❑
#Is tankage available for properly waste sludge? M ❑ ❑ ❑
Comment:
Solids Handling Equipment Yes No NA NE
Is the equipment operational? ❑ ❑ ❑
Is the chemical feed equipment operational? ❑ ❑ ❑
Is storage adequate? H ❑ ❑ ❑
Is the site free of high level of solids in filtrate from filter presses or vacuum filters? ❑ ❑ M ❑
Is the site free of sludge buildup on belts and/or rollers of filter press? ❑ ❑ M ❑
Is the site free of excessive moisture in belt filter press sludge cake? ❑ ❑ M ❑
The facility has an approved sludge management plan? M ❑" ❑ ❑
Comment: - -
Pump Station -Effluent Yes No NA NE
Is the pump wet well free of bypass lines or structures? M ❑ ❑ ❑
Are all pumps present? M ❑ ❑ ❑
Are all pumps operable? M ❑ ❑ ❑
Are float controls operable? 0 ❑ ❑ ❑
Page# 4

Permit: NC0043176 Owner-Facility: Dunn WWTP
Inspection Date: 03/16/2016 Inspection Type: Compliance Evaluation
Pump Station -Effluent Yes No NA NE
Is SCADA telemetry available and operational? M ❑ ❑ ❑
Is audible and visual alarm available and operational? M ❑ ❑ ❑
Comment:
Pump Station -Influent Yes No NA NE
Is the pump wet well free of bypass lines or structures? M ❑ ❑ ❑
Is the wet well free of excessive grease? M ❑ ❑ ❑
Are all pumps present? M ❑ ❑ ❑
Are all pumps operable? ❑ ❑ ❑
Are float controls operable? ❑ ❑ ❑
Is SCADA telemetry available and operational? N ❑- ❑ 0-
Is audible and visual alarm available and operational? M ❑ ❑ ❑
Comment:
Bar Screens Yes No NA NE
Type of bar screen
a.Manual ❑
b.Mechanical
Are the bars adequately screening debris? M ❑ ❑ ❑
Is the screen free of excessive debris? M :❑ ❑ ❑
Is disposal of screening in compliance? ® ❑ ❑ ❑
Is the unit in good condition?, 0 ❑ ❑ '❑
Comment:
Grit Removal Yes No NA NE
Type of grit removal -
a.Manual ❑
b.Mechanlcal M - '
Is the grit free of excessive organic matter? M ❑ ❑ ❑
Is the grit free of excessive odor? ❑ ❑ ❑
#Is disposal of grit In compliance? M ❑ ❑ ❑
Comment:
Page# 5

Permit: NCO043176 Owner-Facility. Dunn VVV fP
Inspection Date: 03/16/2016 Inspection Type: Compliance Evaluation
Equalization Basins Yes No NA NE
Is the basin aerated? ❑ ❑ ❑
Is the basin free of bypass lines or structures to the natural environment? M ❑ ❑ ❑
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? ❑ ❑ ❑
Comment:
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? E ❑- ❑ ❑
Are weirs level? ® ❑ ❑ ❑
Is the site free of weir blockage? ❑ ❑ ❑
Is the site free of evidence of short-circuiting? 0 ❑ ❑ ❑
Is scum removal adequate? 0 ❑ ,❑ ❑
Is the site free of excessive floating sludge? N ❑ ❑ ❑
Is the drive unit operational? H ❑ ❑ ❑
Is the return rate acceptable(low turbulence)? ❑ ❑ ❑
Is the overflow clear-of excessive solids/pin floc? S ❑ ❑ ❑
Is the sludge blanket level acceptable?(Approximately'/<of the sidewall depth) M ❑ ❑ ❑
Comment:
Aeration Basins Yes No NA NE
Mode of operation Ext.Air
Type of aeration system Diffused
Is the basin free of dead spots? E ❑ ❑ ❑
Are surface aerators and mixers operational? ❑ ❑ 0 ❑
Are the diffusers operational? ❑ ❑ ❑
Is the foam,the proper color for the treatment process? E ❑ ❑ ❑
Does the foam cover less than 25%of the basin's.surface? M ❑ ❑ ❑
Is the DO level acceptable? M ❑ ❑ ❑
Page# 6

Permit: NCO043176 Owner-Facility: Dunn VVWrP
Inspection Date: 03/16/2016 Inspection Type: Compliance Evaluation
Aeration Basins Yes No NA NE
Is the DO level acceptable?(1.0 to 3.0 mg/I) M ❑ ❑ ❑
Comment:
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? ❑ ❑ M ❑
#Is de-chlorination substance stored away from chlorine containers? M ❑ ❑ ❑
Comment:
Are the tablets the proper size and type? ❑ ❑ M ❑
Are tablet de-chlorinators operational? ❑. ❑ M ❑
Number of tubes in use?
Comment:
Standby Power Yes No NA NE
Is automatically activated standby power available? M ❑ ❑ ❑
Is the generator tested by interrupting primary power source? M1, ❑ ❑ ❑
Is the generator tested under load? 0 ❑ ❑ ❑
Was generator tested&operational during the Inspection? ❑ ❑ ❑
Do the generator(s)have adequate capacity to operate the entire wastewater site? M, ❑ ❑ ❑
Is there an emergency agreement with a fuel vendor for extended run on back-up power'? ❑ ❑ ❑
Is the generator fuel level monitored? M ❑ ❑ ❑
Comment:-
Pumps-RAS-WAS Yes No NA NE
Are pumps in place? ' ❑ ❑ ❑
-Are pumps operational?
Are there adequate spare parts and supplies on site? ❑ ❑ ❑
Comment:
Laboratory Yes No NA NE
Are field parameters performed by certified personnel or laboratory? M ❑ ❑ ❑
Are all other parameters(excluding field parameters)performed by a certified lab? M ❑ ❑ ❑
Page# .7

Permit: NCO043176 Owner-Facility: Dunn VVVVrP
Inspection Date: 03/16/2016 Inspection Type: Compliance Evaluation
Laboratory Yes No NA NE
#Is the facility using a contract lab? 0 ❑ ❑ ❑
#Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees M ❑ ❑ ❑
Celsius)?
Incubator(Fecal Coliform)set to 44.5 degrees Celsius+/-0.2 degrees? M ❑ ❑ ❑
Incubator(BOD)set to 20.0 degrees Celsius+/- 1.0 degrees? ❑ ❑ M ❑
Comment:
Disinfection-Liquid Yes No NA NE
Is there adequate reserve supply of disinfectant? ❑ ❑ ❑
(Sodium Hypochlorite) Is pump feed system operational? M ❑ ❑ ❑
Is bulk storage tank containment area adequate?(free of leaks/open drains) 0 ❑ ❑ ❑
Is the level of chlorine residual acceptable? M ❑ ❑ ❑
Is the contact chamber free of growth, or sludge buildup? ❑ ❑ ❑
Is there chlorine residual prior to de-chlorination? M ❑ ❑ .❑
Comment:
Influent Sampling Yes No NA NE
#Is composite sampling flow proportional? ❑ • ❑ M ❑
Is sample collected above side streams? ❑ ❑ ❑
Is proper volume collected? M ❑ ❑ ❑
Is the tubing clean? M ❑ ❑ ❑
#Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees 11 ❑ ❑ ❑
Celsius)?
Is sampling performed according to the permit? 0 ❑ ❑ ❑
Comment:
Effluent Sampling Yes No NA NE
Is composite sampling flow proportional? IM El El El
Is sample collected below all treatment units? M ❑ ❑ ❑
Is proper volume collected? 0 ❑ ❑ ❑
Is the tubing clean? N ❑ ❑ ❑
#Is proper temperature set for sample storage(kept at less than or equal to 6.0 degrees M ❑ ❑ ❑
Celsius)'?
Is the facility sampling performed as required by the permit(frequency,sampling type M ❑ ❑ ❑
representative)?
Page# 8

Permit: NC0043176 Owner-Facility: Dunn VVWrP
Inspection Date: 03/16/2016 Inspection Type: Compliance Evaluation
Effluent Sampling Yes No NA NE
Comment:
Upstream/ Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit(frequency,sampling type,and ❑ ❑ N ❑
sampling location)?
Comment: Facility is a member of the Middle Cape Fear River Basin Association.
Page# 9

PF
,r
The City of Dunn has one wastewater treatment plant, located at 580 J.W. Edwards Lane. This plant is
known as the Blackriver Wastewater Treatment Plant. The first plant at this site was constructed in the
1920's and has been upgraded and expanded several times since. In 1995, the plant was expanded and
was permitted to a capacity of 3.75 MGD with a plant peak hydraulic capacity of 7.5 MGD. In 2010 the
latest upgrade began with the Influent Pump station, Influent screening, grit removal, a flow
equalization tank and fine bubble diffused aeration in digester. These improvements have optimized
the plant operations and capabilities.
The WWTP includes the following individual processes.
Table 2-1
Summary of Processes
Process Description
Influent Pumping Two 2,100 GPM suction lift pumps
Two 3,500 GPM suction lift pumps
Influent Screening Two mechanically cleaned bar screens with 1/4" bar
spacing and screenings compactor
One manually cleaned bypass bar screen with 1/2" bar
s acin
iGrit Removal One grit concentrator
! One grit washing unit — I
One grit dewatering escalator
j Fbva Equalization One 3.0 MG tank
I
Two 2,100 GPM suction lift pumps
Acisvated Sludge Basin One aeration basin with coarse bubble diff asee
aeration.
Three 3150 SUM centrifugal blowers
Clarifiers Three 60 foot circular bottom scraper clarifiers
Chlorine Disinfection 12.50/a Sodium Hypochlorite
40% Sodium Bisulfate
Sludge Thickening One 150 GPM rotary drum thickener
Aerated Sludge Digestion One 125,000 gallon basin with fine bubble diffused
aeration
Three 375 SC FM positive displacement blowers
Sludge Holding One 500,000 gallon sludge holding tank with aeration
" suent Pumping Three 4,600 GPM vertical turbine pumps

r
The Dunn Wastewater Collection system consists of approximately 75 miles of sewer lines and seven
liftstations. Wastewater enters the site by gravity from the collection system and flows into the influent
Wet Well, located within the Influent Pump Station(IPS). Here it is pumped approximately 14 feet
upwards by suction lift pumps and discharged into the Primary Treatment Facility. The wastewater is
then diverted into either one or both Mechanical Bar Screens where debris is removed. Screenings are
compacted and conveyed to a dumpster for disposal in a solid waste facility.
Before leaving the primary treatment facility,the wastewater flows through a 24" parshall flume so that
accurate process flow measurements can be recorded.
During high flow periods, part of the wastewater can be diverted into the Equalization Wet Well,where
it is then pumped to the 3 million gallon Equalization Basin. The wastewater can remain in the basin
until peak flows have subsided and the influent flow is below the plant capacity. At this point
wastewater held in the Equalization Basin can be directed to the Aeration Basin and continue
processing.
The influent wastewater coming from the Primary Treatment Facility and any return wastewater from
the Equalization Basin then meet in the Aeration Basin Junction Box. Return activated sludge (RAS) and
supernatant from the Rotary Drum Thickener are also piped into this box. The flow leaves via two 24"
pipes and enters the Aeration Basin.
Once the wastewater has entered the aeration Basin, coarse bubble diffused air agitates the water,
introducing oxygen and allowing the wastewater to be consumed by the bacteria present in the
activated sludge mixed liquor. The basin has a detention time of 15 hours before the water exits the
basin via overflow weirs and is distributed to the three Clarifiers.
The Clarifiers are conventional circular center feed, peripheral overflow devices. Each unit is equipped
with a center feedwell, sludge suction tubes, and effluent v-notch weir plates. Each unit also has a drive
motor attached to a mechanical scraper for solids removal.
The low surface overflow rates in the clarifiers allows the sludge to settle to the bottom, while clarified
water exits each clarifier basin over a effluent v-notch weir, where it is then piped to a junction box.l
From there, the treated water enters the Chlorine contact basin.
As water enters the Contact Basin, it is mixed with a sodium hypochlorite solution (chlorine)to disinfect
any organisms present. The Contact Basin provides a contect time of at least 30 minutes before the
effluent exits and flows through a parshall flume. After leaving the parshall flume, the effluent is
injected with sodium bisulfate to neutralize the chlorine. Effluent then travels to the Effluent Pump
Station Wet Well, where it is pumped to the Cape Fear River and discharged.
The Sludge Pump Station Wet Well receives RAS flow from all three clarifiers. RAS is pumped via suction
lift pumps to a sludge control vault, where electrically actuated valves are provided to control flow rate

and to divert waste activated sludge (WAS)to the Rotary Drum Thickener. Each sludge line is equipped
with a magnetic flow meter to provide an indication of flow rate and volume of sludge.
Once the thickened sludge leaves the Rotary Drum Thickener, it is pumped via Vertical Plunger Sludge
Pumps to the Digester. The Digester includes a sludge feed line, floating decanter, sludge withdrawal
line, and aeration diffusers.
Digested sludge can be pumped from the Digester to the Sludge Holding Tank. The holding tank has a
floating mixer and also has aeration capabilities, to keep solids suspended and prevent septic conditions.
Three positive displacement blowers provide air to both the digester and the holding tank.
Several times a year, sludge from the Sludge Holding Tank is loaded onto trucks and taken offsite for
land application.

. 1
-----------------r-----
.�.-�'' ; SLIGE
DIGESTER 1 LOAQING
SLUDGE
HOLDING — —
ABANDONED DIGESTER TANK
BLOWERS --- '
DRYING BEDS
EFFLUENT
PUMP
STATION
INFLUENT
1 PUMP p — AERATION 1 }( II
STATION r M�BLOWERS RDT II II II
I PTF
o DRAIN PS CHEM i II
ril
El® F] _ _ FEED II
/GEN Q ° II S F115CHLORINE
I I
CONTACT
ADMIN. JB-1 II BASIN
BLDG. CLARIFIER CLARIFIER !
/ 1 I E❑❑❑❑❑❑❑ N0. 1 NO 2
1 I
GEN
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AERATION II
3 FLOW X X--X -- BASINS CLARIFIER
EQUALIZATION I IVO. :5 �I
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1

`
MONITORING REPORTxxnVVIOLATIONS for: Report Date 0405/10 Page 1of1
VP
Vo at
10 ctidn:
psnMIr wuoo*xro pAnmry City mDunn'Dunn vmwTp noumry Harnett nsomw. Fayetteville
Limit Violation
wow/ron/ws oormLu vmu«/ow UNIT OF u*Loomrsu m
psronr p,/ Loo^nom p^p^wsrsn DATE meuvswo, msa»ons um/r v«ms Over VIOLATION TYPE . vmwTmw*vnow
08'201e 001 Effluent Chlorine,Total Residual 08/30/12 5xweek uo// 28 uu 71 Daily Max/mum woAction,apJ
sxuoouou
06'2013 001 Effluent Flow,mconduit v,mm 06m013 Continuous muu oro 4061 8 Monthly Average wuAction,om
treatment plant Exceeded
07'e013 001 Effluent Flow,mconduit v,mm 07/31/13 Continuous mou ors 6.297 mo Monthly Average wuAction,apJ
treatment plant sxveeuoo
ou'uow 001 emuom Flow,mconduit mmm 02m81* Continuous mou ors usso 5.6 Monthly Average Proceed to NOD
treatment plant Exceeded
05'201* 001 Effluent Flow,mconduit o,mm 05/31/14 Continuous muu 3.75 ursu 0.1 Monthly Average Proceed mNOD
treatment plant Exceeded
01'2015 001 Effluent Flow,mconduit vrm,u 01/31/15 Continuous mou 375 ^s11 euu Monthly Average Proceed mNOV
treatment plant smmeueo
03-2015 001 Effluent Flow,mconduit o,mm 03/31/15 Continuous muu orx 4 102 9.4 Monthly Average Proceed mNOV
treatment plant smmouon
11'2015 001 Effluent Flow,mconduit u,mm 11/30/15 Continuous mou urs 3895 so Monthly Average Proceed mNOV
treatment plant smmoueu
01'2016 001 onuom Flow,mconduit mmm 01m1/16 Continuous muu urs omo uu Monthly Average None
treatment plant Exceeded
02'2016 001 Effluent Flow,.nconduit o,mm 02oe16 Continuous mou uru 5107 oou Monthly Average munu
treatment plant smmaaeu
—