HomeMy WebLinkAboutNC0085812_Draft Permit_20220111ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
S. DANIEL SMITH NORTH CAROLINA
Director Environmental Quality
January 11, 2022
Mark Watson, County Manager
Union County Public Works
500 N Main St, Ste 918
Monroe, NC 28112
Subject: Draft NPDES Permit NC0085812
Grassy Branch WRF
Grade II Biological WPCS
Union County
Dear Mr. Neff:
The Division has reviewed your request to modify the subject permit. Please review this draft carefully
to ensure a thorough understanding of the information, conditions, and requirements it contains.
The draft permit includes the following significant changes from the existing permit:
• The permit was modified for flow expansion from 0.050 MGD to 0.120 MGD. A second effluent
table is included for the flow modification. See Condition A. (2.).
• The limit for dissolved oxygen is changed to Daily Average > 6.0 mg/L. See Conditions A. (1.)
and (2.). This change is in accordance with flow design criteria for new and expanding
discharges to zero flow streams (7Q10 = 0 and 30Q2 > 0) [15A NCAC 02B .0206]. The original
wasteload allocation in 1996 indicated this limitation as well.
• The electronic reporting permit special condition A. (4.) was updated.
• The permit map was updated.
The NPDES standard conditions (Parts II, III, and IV) that are a part of the permit are not included in
this draft document (cover, map, and Part I). The conditions are the same as in your current permit
except that agency and division names have been updated. The latest version is available at
https://bit.ly/2BZ4xxx and can be viewed online or downloaded as a PDF file.
With this notification, the Division will solicit public comment on this draft permit by publishing a
notice in newspapers having circulation in the general Union County area, per EPA requirements. Please
provide your comments, if any, to me at the address below no later than 30 days after receiving
this draft permit.
Following the 30-day public comment period, the Division will review all pertinent comments and take
appropriate action prior to issuing a final permit.
NORTH CAROLINA
Department of Environmental Quality
North Carolina Department of Environmental Quality I Division of Water Resources
512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
919.707.9000
If you have questions concerning the draft, please contact me at 919-707-3618, or via e-mail at
derek.denard@ncdenr.gov.
Sincerely,
Derek C. Denard, Environmental Specialist
Division of Water Resources, NCDEQ
ec: NPDES Files [Laserfiche]
Union County / William M. Watson[Mark.Watson@unioncountync.gov]; Andy Neff, P.E., [andy.neff@unioncountync.gov];
Bart Farmer[bart.farmergunioncountync.gov]
DWR/MRO Corey Basinger [corey.basinger@ncdenr.gov]; Roberto Scheller [roberto.scheller@ncdenr.gov]
NPDES Permit NC0085812
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions of North Carolina G
and regulations promulgated and adopted by
Commission, and the Federal Wa
r
tatute 143-215.1, other lawful standards
Carolina Environmental Management
ution Control Act, as amended,
Union County • lic orks
are hereby authorized to discharwastewate a facility located at the
GrasiBranch WW
1629 Old Fis oad (off NCS , onroe, NC
Union County
to receiving waters designated as Crooked Creek with e Yadkin -Pee Dee River Basin in accordance
with effluent limitations, monitoring requirements, and r conditions set forth in Parts I, II, III, and
IV hereof.
The permit sliall bjcome effecti
This permit and the authorization
Signed this day
ischarge shall expire at midnight on October 31, 2023.
S. Daniel Smith, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 9
NPDES Permit NC0085812
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of
this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the
exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements,
terms, and provisions included herein.
Union County Public Works
is hereby authorized to:
1. Continue to operate an existing 0.05 MGD wastewaent that includes the following
wastewater treatment components:
• an influent pump station
• a manual bar screen
• two (2) flow equalization basins
• two (2) aeration basins
• two (2) secondary clarifi
• aerated sludge digester
• two (2) tertiary filters
• ultraviolet disinfection
• backup chlorination/dechlorinati
• continuous flow measurement
• standbpower
located at the Grassy WWTP (1629 Old Fish l(ad,
2. after receipt ohn Authoriz ion to Construct and submittal
0.120 GD, operate tewater treatment plant consisting
an influent station
two (2) manua screens
ee (3) flow equalization basins
(3) aeration basins
• th secondary clarifiers
• three -rated sludge iligesters
• three (3) fi ters
• a disc filter
• ultraviolet disco econ
• backup chlorination/dechlorination
• continuous flow measurement
• standby power
Monroe) in Union County; and
of an Engineers Certification for expansion to
of the following components:
3. discharge from said treatment works, via Outfall 001, at a location specified on the attached map, into
Crooked Creek [Stream Index 13-17-20], currently Class C waters within Subbasin 03-07-12 [HUC
030401050702] of the Yadkin -Pee Dee River Basin.
Page 2 of 9
NPDES Permit NC0085812
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 15A NCAC 02B .0500 et seq.]
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
During the period beginning on the effective date of this permit and lasting until expansion above 0.050 MGD or
expiration, the Permittee is authorized to discharge treated wastewater from Outfall 001. Such discharges shall be
limited and monitored) by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
[PARAMETER CODES]
LIMITS
MONITORING REQUIREMENTS1
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location2
Flow (MGD)50050
0.050 MGD
Continuous
RecordingInfluent
or
Effluent
BOD, 5-day, 20°C (mg/L) 3
(April 1 — October 31)
C0310
5.0 mg/L
7.5 mg/L
Weekly
Composite
Effluent,
Influent
BOD, 5-day, 20°C (mg/L) 3
(November 1—March 31)
C0310
10.0 mg/L
15.0
Weekly
omposite
Effluent,
Influent
Total Suspended Solids 3
(TSS) (mg/L)
C0530
45.0 mg/L
Weekly
Composite
Effluent,
Influent
NH3 as N (mg/L)
(April 1 — October 31)
C0610
2.0
L
Weekly
Composite
Effluent
NH3 as N (mg/L)
(November 1 —March 31)
C0610
4.0 mg
12.0 m
Weekly
Composite
Effluent
Dissolved Oxygen (DO)
0030
Daily Average > 6.0 mg/L 4
Weekly
Grab
Effluent
Fecal Coliform (#/100 ml)
(geometric mean)
31616
0/100 ml
4 0 ml
Weekly
Grab
Effluent
Temperatur
itorin eport
Weekly
Grab
Effluent
Total Chlorine
(TRC)
50060
17 µg/L5
2/Week
Grab
Effluent
pH (su)
00400
and
< 9.0 standard units
Weekly
Grab
Effluent
6
Mercury, Total (n
COMER
6
Once Per Permit Cycle
Once per
permit cycle
Grab
Effluent
Dissolved Oxygen (D L)
00300
Monitor & Report
Variable2
Grab
U, D
Temperature (°C)
00010
Monitor & Report
Variable2
Grab
U, D
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the Division's eDMR system
[see A. (4)].
2. Sample locations: U- Upstream 50 feet above discharge point, D- Downstream at NC 218 bridge.
Upstream/downstream samples shall be collected 3/Week during June, July, August, September, and Weekly
during the remaining months of the year.
Instream monitoring requirements shall be provisionally waived so long as the permittee remains a member of
the Yadkin Pee Dee River Basin Association and the Association continues to function as approved by the
Division and Environmental Management Commission.
Page 3 of 9
NPDES Permit NC0085812
3. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
4. Total Residual Chlorine monitoring is required only if chlorine is added to the effluent.
5. The Division shall consider all effluent TRC values reported below 50 gg/1 to be in compliance with the
permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina
certified laboratory (including field certified), even if these values fall below 50 gg/L.
6. Compliance with this limit shall be determined in accordance with A. (3).
Conditions:
• There shall be no discharge of floating solids or visible foam in others trace amounts.
Page 4 of 9
NPDES Permit NC0085812
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 15A NCAC 02B .0500 et seq.]
Grade II Biological Water Pollution Control System [15A NCAC 08G.0302]
During the period beginning upon receipt of an Engineer's Certification for completion of the 0.120 MGD expansion
and lasting until expiration, the Permittee is authorized to discharge treated wastewater from Outfall 001. Such
discharges shall be limited and monitored) by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
[PARAMETER CODES]
LIMITS
MONITORING REQUIREMENTS1
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location2
Flow (MGD)50050
0.120 MGD
Continuous
RecordingInfluent
or
Effluent
BOD, 5-day, 20°C (mg/L) 3
(April 1 — October 31)
C0310
5.0 mg/L
7.5 mg/L
Weekly
Composite
Effluent,
Influent
BOD, 5-day, 20°C (mg/L) 3
(November 1—March 31)
C0310
10.0 mg/L
.0 mg/L
Composite
Effluent,
Influent
Total Suspended Solids 3
(TSS) (mg/L)
C0530
30.0 mg/L
45.0 m
Week
Composite
Effluent,
Influent
NH3 as N (mg/L)
(April 1 — October 31)
C0610
L
6.0 mg/
Weekly
omposite
Effluent
NH3 as N (mg/L)
(November 1 — March 31)
C0610
4.
0 mg/L
Weekly
Composite
Effluent
Dissolved Oxygen (DO) (mg/L)
00300
► y
Aver 4 mg/L
Weekly
Grab
Effluent
Fecal Coliform (#/100 ml)
(geometric mean)
200/100 ml
400/100 m
Weekly
Grab
Effluent
Temperature (°C)
00010
'
Monitoring & Report
Weekly
Grab
Effluent
Total Residual Chlorine 4'5 141
(TRC) (µg/
50060
17 µg/L5
2/Week
Grab
Effluent
pH (su)
00400
> 6.0 standard units
Weekly
Grab
Effluent
6
Mercury, (ng/L)
OMER
6
Once Per Permit Cycle
Once per
permit cycle
Grab
Effluent
Dissolved Oxy O) (mg/L)
onitor & Report
Variable2
Grab
U, D
Temperature (°C)
000
Monitor & Report
Variable2
Grab
U, D
Footnotes:
1. The permittee shall submiu. arge monitoring reports electronically using the Division's eDMR system
[see A. (4)].
2. Sample locations: U- Upstream 50 feet above discharge point, D- Downstream at NC 218 bridge.
Upstream/downstream samples shall be collected 3/Week during June, July, August, September, and Weekly
during the remaining months of the year.
Instream monitoring requirements shall be provisionally waived so long as the permittee remains a member of
the Yadkin Pee Dee River Basin Association and the Association continues to function as approved by the
Division and Environmental Management Commission.
3. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent
value (85% removal).
Page 5 of 9
NPDES Permit NC0085812
4. Total Residual Chlorine monitoring is required only if chlorine is added to the effluent.
5. The Division shall consider all effluent TRC values reported below 50 µg/1 to be in compliance with the
permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina
certified laboratory (including field certified), even if these values fall below 50 µg/L.
6. Compliance with this limit shall be determined in accordance with A. (3).
Conditions:
• There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (3.) EFFLUENT MERCURY ANALYSIS [G.S. 143-2
The Permittee shall provide one effluent mercury sis, using EPA Method 1631E, in conjunction
with the next permit renewal application. The analysis should be taken within 12 months prior to the
application date. Any additional mercu effluent mercury measurement conducted from the effective
date of this permit and up to the applicate shall be submitted with the renewal application.
If the result of the mercury analysis is iii i provided with the application, the application may be
returned as incomplete and the Permittee considered non -compliant.
Page 6 of 9
NPDES Permit NC0085812
A. (4.) ELECTRONIC REPORTING - DISCHARGE MONITORING REPORTS
[G.S. 143-215.1 (b)]
Federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and program
reports. The final NPDES Electronic Reporting Rule was adopted and became effective on December
21, 2015.
NOTE: This special condition supplements or supersedes the following sections within Part II of this
permit (Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
1. Re , ortin Re i uirements Su s ersedes Section D. 2. and Section E. 5.
The permittee shall report discharge monitoring data electronic 11y using the DWR's Electronic
Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained duringthe previous month(s) 1 be summarized for each month and
submitted electronically using eDMR. The eDMR system al s permitted facilities to enter
monitoring data and submit DMRs electronically using the internet. The eDMR system may be
accessed at: https://deq.nc.gov/about/divisions/water-resources/edmr�
If a permittee is ultble to use the eDMR system due to a demonstrated hardship or due to the facility
being physically 1 cated in an area where less than 10 percent oftfie households have broadband
access, then a temporary waiver from the NPDLS electronic reporting requirements may be granted
and discharge monitoring data may be submitted on paper DMR forms (MR 1, 1.1, 2, 3) or
alternative forms approved by the Director. Duplicate signed copies shall be submitted to the
following address:
NC D Division of Water Resources / Water Quality Permitting Section
ATTEN : Central Files
1617 Mail e Center w
Raleigh, Nort . slim 276917
See "How to Reque' om Electronic Reporting" section below.
Monitoring results obtained during the previous month(s) shall be summarized for each month and
reported via the eDMR system no later than the last calendar day of the month following the
completed reporting period. Regardless of the submission method, the first DMR is due on the last
day of the month following the issuance of the permit or in the case of a new facility, on the last day
of the month following the commencement of discharge.
Starting on December 21, 2025, the permittee must electronically report the following compliance
monitoring data and reports, when applicable:
Page 7 of 9
NPDES Permit NC0085812
• Sewer Overflow/Bypass Event Reports;
• Pretreatment Program Annual Reports; and
• Clean Water Act (CWA) Section 316(b) Annual Reports.
The permittee may seek an electronic reporting waiver from the Division (see "How to Request a
Waiver from Electronic Reporting" section below).
2. Electronic Submissions
In accordance with 40 CFR 122.41(1)(9), the permittee must identthe initial recipient at the time
of each electronic submission. The permittee should use the EPA s website resources to identify the
initial recipient for the electronic submission.
Initial recipient of electronic NPDES information from 1lPDES-regulated facilities means the entity
(EPA or the state authorized by EPA to implement the NPDES program) that is the designated entity
for receiving electronic NPDES data [see 40 CFR 127.2(b)].
EPA plans to establish a website that will also link to the appropriate electro • orting tool for
each type of electronic submission and for each state. Instructions on how to a . i d use the
appropriate electronic reporting toil will be available as well. Information on EP NPDES
Electronic Reporting Rule is found at: https://www.federilregister.gov/documents/2015/10/22/2015-
24954/nati onal-pollutant-discharge-elimination-system-npdes-electronic-reporting-rule
Electronic submissions must start by the dates listed in the "Reporting Requirements" section above.
3. How to Request a Waiver from Electronic Reporting
The permittee may seek a temporary electronic reporting waiver from the Division. To obtain an
electronic reporting waiver, a permittee must first su•mit an electronic reporting waiver request to
the Division. Requests for temporary electronic re • s g waivers must be submitted in writing to
the Division for written approval at least six d. s prior to the date the facility would be
required under this permit to begin submitting m toring data and reports. The duration of a
temporary waiver shall not exceed 5 years and shall thereupon expire. At such time, monitoring data
and repo all be submits electronically to the Division unless the permittee re -applies for and is
granted a n: porary electronic reporting waiver by the Division. Approved electronic reporting
waivers are n r . sferrable. Only permittees with an approved reporting waiver request may
submit monitorin, . and repo+ on paper to the Division for the period that the approved
reporting waiver re • s effective.
Information on eDMR an
the following web page:
e application for a temporary electronic reporting waiver are found on
http://deq.nc.gov/about/divisions/water-resources/edmr
Page 8 of 9
NPDES Permit NC0085812
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II,
Section B. (11.)(a) or by a duly authorized representative of that person as described in Part II,
Section B. (11.)(b). A person, and not a position, must be delegated signatory authority for eDMR
reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user
account and login credentials to access the eDMR system. For more information on North
Carolina's eDMR system, registering for eDMR and obtaining a DMR user account, please visit
the following web page:
http://deq.nc.gov/about/divisions/water-resources/edmr
Certification. Any person submitting an electroni
the following certification [40 CFR 122.22].
WILL BE ACCEPTED:
using the state's eDMR system shall make
ER STATEMENTS OF CERTIFICATION
"I certify, under penalty of law, that this document and all at
ents were prepared under my
direction or supervision in accorda ce with a systesignec'assure that qualified personnel
properly gather and evaluate the iormation submitted. Based on my inquiry of the person or
persons who manage the system, or those per s directly responsible for gathering the information,
the information submitted is, to the besmy edge and belief true, accurate, and complete. I
am aware that there are significant pen s for mitting false inf rmation, including the
possibility of fines an imprisonment for knowing violations "
5. Records Retention [Supplements Section D. (6.)1
The permittshall retain records of all Discharge M nitoring Reports, including eDMR
submissions. These records or copies shall be main ed for a period of at least 3 years from the
date of the report. This period may be extend r uest of the Director at any time [40 CFR
122.41].
Page 9 of 9
Outfall 001
tut ot, fin% crh°
Union County Public Works
Grassy Branch WWTP
NPDES Permit NC0085812
1629 Old Fish Road, Monroe, NC
Receiving Stream: Crooked Creek
Stream Segment: 13-17-20
River Basin: Yadkin -Pee Dee
County: Union
Stream Class: C
Sub -Basin #: 03-07-12
HUC: 030401050702
SCALE
1:24,000
1:14,000,000VeSVIIII
sir-NWPAit����
ram,
Outfall 001: 35° 07' 50" N, -80° 29' 40" W
USGS Quad: Stanfield, NC