NC0073539_Inspection_20191015

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
Mr. Shannon V. Becker, President
Aqua North Carolina, Inc.
202 Mackenan Court
Cary, North Carolina 27511
Dear Mr. Becker:
NORTH CAROLINA
Environmental Quality
October 15, 2019
Subject: Compliance Evaluation Inspection
Willowbrook Subdivision WWTP
NPDES Permit No. NCO073539
Mecklenburg County
Enclosed is a copy of the Compliance Evaluation Inspection Report for the inspection conducted at the subject facility on
September 25, 2019, by Mr. Wes Bell of this Office. Please inform the facility's Operator -in -Responsible Charge (ORC) of
our findings by forwarding a copy of the enclosed report.
It is requested that a written response be submitted to this Office by November 6, 2019, addressing the concerns regarding
the old bar screen and V-notch weir angle, as discussed further in the Bar Screen and Flow Measurement — Effluent
Sections in the attached report. The response must include a copy of the third parry evaluation of the V-notch weir and any
corrective actions. Please address your response to the attention of Mr. Bell.
The report should be self-explanatory; however, should you have any questions concerning this report, please do
not hesitate to contact Mr. Bell at [phone] or at wes.bell(cr�,ncdenr.gov.
Sincerely,
Docu Signed by:
F161FB69A2D84A3... for
W. Corey Basinger, Regional Supervisor
Water Quality Regional Operations Section
Division of Water Resources, NCDEQ
Enclosure: Inspection Report
D Q
� North Carolina Department of Environmental Quality I Division of Water Resources
Mooresville Regional Office 1 610 East Center Avenue, Suite 301 1 Mooresville, North Carolina 28115
NORTH CAROLINA
Da"MoM a enWmn�bl mwnq 704,663.1699

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 I 2 IF I 3 I NCO073539 111 12 I 19/09/25 I17 18 I S i 19 i G i 201 I
211111 I I I I I I II I I I I I I I I I I I I I I I I I I I I I I I II I I I I I f6
Inspection
Work Days Facility Self -Monitoring Evaluation Rating B1 QA ---------------------- Reserved -------------------
67
2.0 70 Id I 71 [.. I 72 73 L_LJ74 751 I I I I I I I80
I —I u
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 oermit Number)
01:00PM 19/09/25
19/02/01
Willowbrook Subdivision WWTP
12309 Ramah Creek Ct
Exit Time/Date
Permit Expiration Date
Huntersville NC 28078
03:15PM 19/09/25
23/11/30
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Daniel G Wimpey/ORC/704-572-6472/
Keith Alan Shattuck//704-489-9404 /
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Shannon V Becker,202 Mackenan Ct Cary NC 27511/President/919-653-5570/
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 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
by: DWR/MRO WQ/704-663-1699 Ext.2192/ 10/14/2019
2 Ge,a
Wes Bell E�:O,,�6')96ID90=437-
entsignedd
Signature of Manage ��`Au}.�view i Agency/Office/Phone and Fax Numbers Date
10.14.19
Andrew PitnerLt1`1369A21D84A3.�H /MRO WQ/704-663-1699 Ext.2180/
161 ..
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type (Cont.)
NCO073539 I11 121 19/09/25 117 18 JCJ
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
FLOW MEASUREMENT — EFFLUENT SECTION cont'd:
The V-notch weir angle was measured at approximately 83 degrees during the inspection; however,
the flow meter was programmed to measure flows for a 90 degree V-notch weir. The Permittee must
contract a third party experienced in flow meter calibrations to verify the V-notch weir angle and the
calibration procedures. Please be advised that the NPDES Permit requires the flow measurement
device be installed, calibrated, and maintained to ensure that the accuracy of the measurements is
consistent with the accepted capability of the type of device and shall be capable of measuring flows
with a maximum deviation of less than 10% from the true discharge rates throughout the range of
expected discharge volumes (Permit Condition Reference: Part II, Section D.3 Flow Measurements).
Page#

Permit: NCO073539 Owner - Facility:
Willowbrook Subdivision WWTP
Inspection Date: 09/25/2019 Inspection Type:
Compliance Evaluation
Permit
Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new ❑
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0
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application?
Is the facility as described in the permit?
0
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# Are there any special conditions for the permit?
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0
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Is access to the plant site restricted to the general public?
0
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Is the inspector granted access to all areas for inspection?
0
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Comment: The last compliance evaluation inspection by DWR staff was performed
on 7/21/16.
Overall, the facility is adequately described in the Permit; however, the facility's aerated
equalization tank (surge tank) was not included. The facility description will need to be
updated during the next Permit renewal process.
Record Keeping
Yes No NA NE
Are records kept and maintained as required by the permit?
0
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Is all required information readily available, complete and current?
0
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Are all records maintained for 3 years (lab. reg. required 5 years)?
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Are analytical results consistent with data reported on DMRs?
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Is the chain -of -custody complete?
0
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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?
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Has the facility submitted its annual compliance report to users and DWQ?
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(If the facility is = or > 5 MGD permitted flow) Do they operate 24/7 with a certified operator
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on each shift?
Is the ORC visitation log available and current?
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Is the ORC certified at grade equal to or higher than the facility classification?
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Is the backup operator certified at one grade less or greater than the facility classification?
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Is a copy of the current NPDES permit available on site?
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Facility has copy of previous year's Annual Report on file for review?
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Page# 3

Permit: NCO073539
Inspection Date: 09/25/2019
Record Keeping
Owner - Facility: Willowbrook Subdivision WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
Comment: The records reviewed durina the inspection were oraanized and well maintained. Discharae
Monitoring Reports (eDMRs) were reviewed for the period August 2018 through July 2019.
No effluent limit violations were reported and all monitoring frequencies were correct.
The ORC and staff must ensure not to report (on edmrs) effluent total residual chlorine
(TRC) values below the lowest standard verified on the TRC meter (annual curve
verification).
Laboratory
Yes No NA NE
Are field parameters performed by certified personnel or laboratory?
0
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Are all other parameters(excluding field parameters) performed by a certified lab?
M
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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 degrees
0
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Celsius)?
Incubator (Fecal Coliform) set to 44.5 degrees Celsius+/- 0.2 degrees?
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0
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Incubator (BOD) set to 20.0 degrees Celsius +/- 1.0 degrees?
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0
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Comment: On -site field analvses (dissolved oxvaen. DH. temperature. total residual chlorine) are
performed under Aqua NC's laboratory certification #5035. Water Tech Labs (all permit
parameters except field) has also been contracted to provide analytical support.
The ORC and staff must ensure that the pH check standard is performed/documented
following the initial pH meter calibration.
Effluent Sampling
Yes No NA NE
Is composite sampling flow proportional?
0
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Is sample collected below all treatment units?
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Is proper volume collected?
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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 degrees
0
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Celsius)?
Is the facility sampling performed as required by the permit (frequency, sampling type
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representative)?
Comment: The subiect Dermit requires composite and arab effluent samples. The sampler
temperature was less than one degree Celsius and collecting 120 ml. aliquots at the time of
the inspection.
The ORC and staff must ensure that all effluent fecal coliform samples are collected directly
into a sterilized container.
Upstream / Downstream Sampling Yes No NA NE
Is the facility sampling performed as required by the permit (frequency, sampling type, and 0 ❑ ❑ ❑
sampling location)?
Page# 4

Permit: NCO073539 Owner - Facility: Willowbrook Subdivision WWTP
Inspection Date: 09/25/2019 Inspection Type: Compliance Evaluation
Upstream / Downstream Sampling Yes No NA NE
Comment:
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 ❑ ❑ ❑
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: The wastewater treatment facility appeared to be properly operated and well maintained.
Process control measurements were being documented and maintained on -site.
The facility's telemetry -type alarm system functioned properly during the on -site test.
Equalization Basins
Yes No NA NE
Is the basin aerated?
N
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Is the basin free of bypass lines or structures to the natural environment?
0
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Is the basin free of excessive grease?
0
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Are all pumps present?
0
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Are all pumps operable?
0
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Are float controls operable?
0
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Are audible and visual alarms operable?
0
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# Is basin size/volume adequate?
0
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Comment:
Bar Screens
Yes No NA NE
Type of bar screen
a.Manual
b.Mechanical
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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: The old coarse bar screen had oartiallv separated from the WWTP structure and was bein
held in place with a rope (in aeration basin). The old bar screen should be removed as soon
as possible to prevent this structure from breaking off into the aeration basin and potentially
damaging the aeration system (diffusers, air headers, etc.).
Aeration Basins Yes No NA NE
Mode of operation Ext. Air
Page# 5

Permit: NCO073539
Inspection Date: 09/25/2019
Aeration Basins
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)
Owner - Facility: Willowbrook Subdivision WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
Diffused
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Comment: Soda ash and lime are added on an as -needed basis to maintain appropriate alkalinity/pH
levels.
Secondary Clarifier
Yes No NA NE
Is the clarifier free of black and odorous wastewater?
0
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Is the site free of excessive buildup of solids in center well of circular clarifier?
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0
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Are weirs level?
0
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Is the site free of weir blockage?
0
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Is the site free of evidence of short-circuiting?
0
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Is scum removal adequate?
0
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Is the site free of excessive floating sludge?
0
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Is the drive unit operational?
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0
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Is the return rate acceptable (low turbulence)?
0
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Is the overflow clear of excessive solids/pin floc?
0
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Is the sludge blanket level acceptable? (Approximately'/4 of the sidewall depth)
0
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Comment:
Disinfection -Tablet
Yes No NA NE
Are tablet chlorinators operational?
0
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Are the tablets the proper size and type?
0
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Number of tubes in use?
4
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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Page# 6

Permit: NC0073539
Inspection Date: 09/25/2019
Owner - Facility: Willowbrook Subdivision WWTP
Inspection Type: Compliance Evaluation
Disinfection -Tablet Yes No NA NE
Comment: The tablet chlorinator was properly secured following the previous inspection; however, the
metal supports did appear to be severely corroded and deteriorated. The Permittee should
investigate the installation of an improved support structure within the near future.
Flow Measurement - Effluent
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: The flow meter was last calibrated/verified by Aqua NC staff on 2/12/19. See "Summary"
Section for additional comments.
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?
Comment:
Are the tablets the proper size and type?
Are tablet de -chlorinators operational?
Number of tubes in use?
Comment:
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?
Yes No NA NE
Tablet
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■
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4
Yes No NA NE
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Comment: The effluent appeared clear with no floatable solids or foam. The receiving stream did not
appear to be negatively impacted.
Aerobic Digester
Yes No NA NE
Is the capacity adequate?
0
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Is the mixing adequate?
0
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Is the site free of excessive foaming in the tank?
0
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# Is the odor acceptable?
0
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Page# 7

Permit: NC0073539
Inspection Date: 09/25/2019
Aerobic Digester
# Is tankage available for properly waste sludge?
Owner - Facility: Willowbrook Subdivision WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
■ ❑ ❑ ❑
Comment: Wastewater solids are removed on an as -needed basis by a contracted company (currently
L&L Environmental).
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?
Comment: A new backup generator had been recently installed prior to the insr
switch had to be ordered and will be installed within the near future.
Yes No NA NE
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A new transfer
Page# 8