NC0021326_Compliance Evaluation Inspection_20200213

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
Laura Neely, Town Manager
Town of Dobson
P.O. Box 351
Dobson, NC 27017
NORTH CAROLINA
Environmental Quality
February 13, 2020
Subject: Compliance Evaluation Inspection
Town of Dobson WWTP
NPDES Permit No. NCO021326
Surry County
Dear Ms. Neely:
A Compliance Evaluation Inspection was performed by North Carolina Division of Water
Resources (DWR) staff person, Justin Henderson on February 12, 2020. Mr. Michael Frazier,
Public Works Director & ORC was present during this inspection. This type of inspection consists
of two basic parts: an in -office review of the facility files and self -monitoring data and an on -site
inspection of the facility. While this inspection mostly reflects compliance with the subject permit,
the following items of concern warrant your attention and action:
1) Collection of composite sampling for required influent parameters is currently being
obtained via a constant time/constant volume method. Per Permit Condition Part II. Section
A. Composite Sampling (4), use of this method requires prior Approval by the Director
and may only be used in situations where effluent flow rates vary less than 15 percent. The
following restrictions also apply: influent and effluent grab samples shall be of equal size
and no less than 100 milliliters; influent samples shall not be collected more than once per
hour.
Future composite sample collection for required monitoring shall comply with collection
methods (1), (2), or (3) described herein.
2) Permit Condition Part II. Section D. (6) and 40 CFR 503 require that records related to the
Permittee's sewage sludge use and disposal activities be retained for a period of a least five
years. While, Mr. Frazier indicated that documentation for the subject facility's disposal
events did exist that it is not currently being maintained in an easily reviewable format.
3) Thermometers located in both the effluent and influent composite samplers indicated that
temperatures in each were above six degrees Celsius at the time of this inspection. While,
sample collection was not occurring during this inspection, samples must be refrigerated
to less than or equal to six degrees Celsius during the entire composting period per CFR
D � North Carolina Department of Environmental Quality I Division of Water Resources
Winston-Salem Regional Office [ 450 West Hanes Mill Road, Suite 300 I Winston-Salem, North Carolina 27105
NOh �HCARO UHA
^^ •^ �ku^m I u�•i` r 336.776.9800

part 136.3 Table II. Please ensure that the facility's automated composite samplers can
comply with this regulation when sample collection is occurring.
4) The subject permit contains a facility description that includes back-up chlorine
disinfection. While, this equipment may have been present at the time of permit issuance,
it has since been removed and is no longer available as part of "back-up" operations. As
such, the permitted facility description needs to be updated to accurately reflect the
facility's treatment equipment available for operations.
Please refer to the enclosed inspection report for additional observations and/or comments. If you
have questions concerning this correspondence,
776-9800.
Sincerely,
DocuSiiggned by:
L-4A, l l >mJtr
on'SMURFlbegional Supervisor
Water Quality Regional Operations Section
Division of Water Resource, NCDEQ-WSRO
enc: Inspection Report
please contact Justin Henderson or me at (336)
cc: Michael Frazier, Public Works Director- frazierm(kdobson-nc.com
Laserfiche Files (electronic copies)

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 15 I 3 I NC0021326 111 12 I 20/02/12 I17 18 I S J 19 L G] 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 -------------------
671
70 I I 71 I I 72 I r I 73 I I 174 751 I I I I I I I80
u ty I I i
Section B: Facility Data
Name and Location of Facility Inspected (For Industrial Users discharging to POTW, also include
Entry Time/Date
Permit Effective Date
POTW name and NPDES oermit Number)
09:30AM 20/02/12
19/01/01
Dobson WWTP
500 Nature Center Rd
Exit Time/Date
Permit Expiration Date
Dobson NC 27017
12:OOPM 20/02/12
23/12/31
Name(s) of Onsite Representative(s)/Titles(s)/Phone and Fax Number(s)
Other Facility Data
Michael Allen Frazier/ORC/336-356-9000/
Name, Address of Responsible Official/Title/Phone and Fax Number
Contacted
Laura H Neely,PO Box 351 Dobson NC 27017/Town
Manager/336-356-8962/3363564836 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
Justin L Henderson DouSigned by: DWR/WSRO WQ/336-776-9701/
t,tsh t, qt,IWt,k,V 6V' 2 / 13 /2 0 2 0
D51F3525961`8113496..
Signature of Management Q A Revie uSigned by: Agency/Office/Phone and Fax Numbers Date
'? Sti,Jcr 2/13/2020
L-L:RAC1P:
EPA Form 3560-3 (Rev 9-94) Previous editions are obsolete.
Page#

NPDES yr/mo/day Inspection Type (Cont.)
NCO021326 I11 121 20/02/12 117 18 ICI
Section D: Summary of Finding/Comments (Attach additional sheets of narrative and checklists as necessary)
A Compliance Evaluation Inspection was performed by North Carolina Division of Water Resources
(DWR) staff person, Justin Henderson on February 12, 2020. Mr. Michael Frazier, Public Works
Director & ORC was present during this inspection. This type of inspection consists of two basic parts:
an in -office review of the facility files and self -monitoring data and an on -site inspection of the facility.
While this inspection mostly reflects compliance with the subject permit, the following items of concern
warrant your attention and action:
1) Collection of composite sampling for required influent parameters is currently being obtained via a
constant time/constant volume method. Per Permit Condition Part II. Section A. Composite Sampling
(4.), use of this method requires prior Approval by the Director and may only be used in situations
where effluent flow rates vary less than 15 percent. The following restrictions also apply: influent and
effluent grab samples shall be of equal size and no less than 100 milliliters; influent samples shall not
be collected more than once per hour.
Future composite sample collection for required monitoring shall comply with collection methods (1),
(2), or (3) described herein.
2) Permit Condition Part II. Section D. (6) and 40 CFR 503 require that records related to the
Permittee's sewage sludge use and disposal activities be retained for a period of a least five years.
While, Mr. Frazier indicated that documentation for the subject facility's disposal events did exist that it
is not currently being maintained in an easily reviewable format.
3) Thermometers located in both the effluent and influent composite samplers indicated that
temperatures in each were above six degrees Celsius at the time of this inspection. While, sample
collection was not occurring during this inspection, samples must be refrigerated to less than or equal
to six degrees Celsius during the entire composting period per CFR part 136.3 Table II. Please ensure
that the facility's automated composite samplers can comply with this regulation when sample
collection is occurring.
4) The subject permit contains a facility description that includes back-up chlorine disinfection. While,
this equipment may have been present at the time of permit issuance, it has since been removed and
is no longer available as part of "back-up" operations. As such, the permitted facility description needs
to be updated to accurately reflect the facility's treatment equipment available for operations.
Please refer to the enclosed inspection report for additional observations and/or comments. If you have
questions concerning this correspondence, please contact Justin Henderson or me at (336)
Page#

Permit: NCO021326
Inspection Date: 02/12/2020
Owner - Facility: Dobson WWTP
Inspection Type: Compliance Evaluation
Operations & Maintenance
Is the plant generally clean with acceptable housekeeping?
Does the facility analyze process control parameters, for ex: MLSS, MCRT, Settleable
Solids, pH, DO, Sludge Judge, and other that are applicable?
Comment: reportedly NH3 is only anlysis analyzed as process control.
Permit
(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?
# 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?
Yes No NA NE
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Yes No NA NE
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• ❑ ❑ ❑
• ❑ ❑ ❑
Comment: The back-up chlorine disinfection equipment is no longer present or available at the facility.
Pump Station - Influent
Yes No NA NE
Is the pump wet well free of bypass lines or structures?
0
❑
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Is the wet well 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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Is SCADA telemetry available and operational?
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0
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Is audible and visual alarm available and operational?
❑
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Comment:
Bar Screens
Yes No NA NE
Type of bar screen
a.Manual
b.Mechanical
Are the bars adequately screening debris?
❑
❑
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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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Page# 3

Permit: NCO021326
Inspection Date: 02/12/2020
Owner - Facility: Dobson WWTP
Inspection Type: Compliance Evaluation
Bar Screens Yes No NA NE
Comment: Mechanical barscreen is primarily used but facility has a back-up manual barscreen
available for necessary maintenace or repairs related to the mechanical barscreen are
needed.
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?
Is the sludge blanket level acceptable? (Approximately'/ of the sidewall depth)
Yes No NA NE
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•
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•
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•
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Comment: Sludge blanket is maintained at approximately 50-60 percent of clarifier depth per the ORC
in each clarifier.
Aeration Basins
Yes No NA NE
Mode of operation
Ext. Air
Type of aeration system
Diffused
Is the basin free of dead spots?
0 ❑
❑
❑
Are surface aerators and mixers operational?
❑ ❑
0
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Are the diffusers operational?
0 ❑
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Is the foam the proper color for the treatment process?
0 ❑
❑
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Does the foam cover less than 25% of the basin's surface?
0 ❑
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Is the DO level acceptable?
❑ ❑
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Is the DO level acceptable?(1.0 to 3.0 mg/1)
❑ ❑
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Comment:
Disinfection - UV
Yes No NA NE
Are extra UV bulbs available on site?
0
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Are UV bulbs clean?
0
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Is UV intensity adequate?
0
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Page# 4

Permit: NCO021326
Inspection Date: 02/12/2020
Disinfection - UV
Is transmittance at or above designed level?
Is there a backup system on site?
Is effluent clear and free of solids?
Owner - Facility: Dobson WWTP
Inspection Type: Compliance Evaluation
Yes No NA NE
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Comment: Back-up generator is present should a power outage occur. Generate can operate entire
plant if necessary including UV disinfection.
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:
Influent Sampling
# Is composite sampling flow proportional?
Is sample collected above side streams?
Is proper volume collected?
Is the tubing clean?
# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
Celsius)?
Is sampling performed according to the permit?
Yes No NA NE
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Yes No NA NE
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Comment: Composite sampling is not collected in compliance with permit conditions. Composite
sampler temperature was 10 degrees Celsius at time inspection was conducted.
Effluent Sampling
Yes No NA NE
Is composite sampling flow proportional?
0
❑
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❑
Is sample collected below all treatment units?
0
❑
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Is proper volume collected?
0
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Is the tubing clean?
0
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# Is proper temperature set for sample storage (kept at less than or equal to 6.0 degrees
❑
0
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Celsius)?
Page# 5

Permit: NC0021326
Inspection Date: 02/12/2020
Effluent Sampling
Owner - Facility: Dobson WWTP
Inspection Type: Compliance Evaluation
Is the facility sampling performed as required by the permit (frequency, sampling type
representative)?
Comment: Composite sampler temperature was 13 degrees Celsius during this inspection.
Upstream / Downstream Sampling
Is the facility sampling performed as required by the permit (frequency, sampling type, and
sampling location)?
Comment:
Yes No NA NE
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Yes No NA NE
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Page# 6

Facility.. _
COMPLIANCE EVALUATION INSPECTION
NPDES:
Permit Effective Dates: to
Inspection Date:
12:00 PM
Inspection Time: am/pm
PERMIT
Complete copy of current NPDES permit
DMRs (Dates:
SELF -MONITORING PROGRAM
to
Yes
LABORATORY
Lab Data (per DMR dates) Available for review - matched DMR reporting
Laboratories used for analysis Statesville Analytical
Chain of Custody forms (per DMR dates) Available for review
-- Effluent is collected flow proportionally
Influent andlor effluent samplers
Influent re uired fl w proportional ASAP
Need to make influent collect flow proportionally
d
Field parameter certification #
N/A - UV disinfection
Nist calibrated 12/6/19
/ Per event cal records present FLOW MEASUREMENT
V Both monitored -reports highest (typicaly influent)
Flow meter calibration records
Calibrated all meters 2x/year - last done 5/1/19
Flow charts
SLUDGE HANDLING DISPOSAL
Sludge / Residuals hauling records
ORC current certificatio
Back Up certification-
OPERATION & MAINTENANCE
0

Process control data (includes field parameters tested and equipment calibrations)
NH3 is all
Generator Inspection I under load checks
Yes
Serviced 4x/year and tested weekly
RECORDS & REPORTS
Wastewater Annual Report (fiscal or calendar year -- if appficable)
Present and avaiable for review.
Daily Operator's log / ORC visitation log
Avaiable for review
Maintenance log Available for review
FACILITY SITE REVIEW
Plant visual inspection of treatment units
Made sure to mentioned this deadline
mission
Reportedely Mt. Airy is taking sluge at 4000 gallons of sludge
or every I uuuuu gallons bt potable water Dobson supplies tb Airy.
No SIUs users domestic flows only)
Planning to LA this March/April 2020
EFFLUENT/RECEIVING WATERS
Stream accessible for inspection (at effluent discharge pipe)
Clear w/ no evidence of solids or foam
Yes
None on -site and no chlorine
Back -back up onsite.
No back-up chlorine disinfection anymore
Must maintain residual/ sewage sluge
Removal disposal records for 5 years
Influent composite sampler temp was 10 at time of inspection
Effluent composite temp was 13 at time of inspection