HomeMy WebLinkAboutNC0058505_Draft Permit_20180220Water Resources
ENVIRONMENTAL QUALITY
ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Interim Director
February 20, 2018
Mr. Shannon V. Becker
Aqua North Carolina, Inc.
202 Mackenan Court
Cary, NC 27511
Subject: Draft NPDES Permit NCO058505
Mallard Crossing WWTP
Wake County
Class WW -2
Dear Permittee:
The Division has reviewed your request to renew the subject permit. Please review this draft
carefully to ensure your thorough understanding of the information, conditions, and
requirements it contains.
The draft permit includes the following significant changes from the existing permit:
➢ Section A. (8.) has been added to require electronic submission of effluent data.
Federal regulations require electronic submittal of all discharge monitoring
reports (DMRs).
➢ An updated outfall map has been included.
With this notification, the Division will solicit public comment on this draft permit by
publishing a notice in newspapers having circulation in the general Wake County area, per
EPA requirements. Please provide your comments, if any, to me 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. If you have any questions
concerning this permit, please contact Emily Phillips at (919) 807-6479.
cc: NPDES files
Sinc 74
5
Emily Phillips
Compliance and Expedited Permitting Unit
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center I Raleigh, NC 27699-1617
919 807 6300 919-807-6389 FAX
https //deq nc gov/about/divisions/water-resources/water-resources-permits/wastewater-branch/npdes-wastewater-permits
Permit NCO058505
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 General Statute 143-215.1, other lawful
standards and regulations promulgated and adopted by the North Carolina Environmental
Management Commission, and the Federal Water Pollution Control Act, as amended,
Aqua North Carolina, Inc.
is hereby authorized to discharge wastewater from a facility located at the
Mallard Crossing WWTP
off Old Milburnie Road (NCSR 2217) north of Knightdale
Wake County
to receiving waters designated as an unnamed tributary to Hodges Mill Creek in the Neuse
River Basin in accordance with effluent limitations, monitoring requirements, and other
conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective
This permit and authorization to discharge shall expire at midnight on March 31, 2023.
Signed this day
Linda Culpepper
Interum Director, Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 9
Permit NCO058505
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked,
and 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.
Aqua North Carolina, Inc.
is hereby authorized to:
Continue to operate an existing 0.100 MGD wastewater treatment system with the
following components:
One influent lift station
One 0.050 MGD extended aeration plant with:
➢ Aeration tank
➢ Sludge holding tank
➢ Dual hopper clarifiers
➢ Diffused post -aeration
➢ Dual blowers
One 0.050 MGD extended aeration plant with:
➢ Aeration tank
➢ Equalizations basin with 150 CFM blower
A Sludge holding tank
> Phosphorus reduction system
> Clarifier
➢ Post -aeration
➢ Dual blowers
➢ Ultraviolet disinfection
The facility is located north of Knightdale at the Mallards Crossing Subdivision WWTP on
NCSR 2217 in Wake County.
2. Continue to introduce ion exchange WTP wastewater and greensand filter WTP backwash
wastewater at maximum of 1,000 gallons per day to the headworks via the manual drip
system.
i
2. Discharge from said treatment works via Outfall 001, at the location specified on the ;
attached map into an unnamed tributary to Hodges Mill Creek, [stream segment 27-26-1-
(2)], a waterbody classified C; NSW waters within sub -basin 03-04-02 [HUC: 030202011 in i
the Neuse River Basin.
i
Page 2 of 9
i
i
i
Permit NCO058505
Part I.
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 et seq.]
During the period beginning on the effective date of this permit and lasting until expiration,
the Permittee is authorized to treat domestic wastewater in combination with 1,000 gpd of ion
exchange WTP wastewater and greensand filter WTP backwash wastewater, and to discharge
treated wastewater from Outfall 001. Such discharges shall be limited, monitored and
reported' by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
Parameter Codes
LIMITS
MONITORING REQUIREMENTS
Monthly Daily
Average Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow (MGD)
50050
01 MGD
Continuous
Recording 2
E
Total Monthly Flow (TMF) 3 (MGM)
82220
Monitor & Report
Monthly
Calculated 2
E
BOD, 5 -day (200C) (mg/L)
C0310
30 0 mg/L
45.0 mg/L
Weekly
Composite
E
Total Suspended Solids (TSS)
C0530
30 0 mg/L
45.0 mg/L
Weekly
Composite
E
NH3 as N (mg/L)
(April 1— October 31
C0610
2.0 mg/L
10.0 mg/L
Weekly
Composite
E
NH3 as N (mg/L)
November 1 — March 31
C0610
4 0 mg/L
20.0 mg/L
Weekly
Composite
E
Dissolved Oxygen (DO) (mg/L)
00300
Daily average not < 5 0 mg/L
Weekly
Grab
E
Temperature (°C)
00010
Daily
Grab
E
Fecal Coliform (#/100m1) 4
31616
200 / 100 ml
400 / 100 ml
Weekly
Grab
E
Total Residual Chlorine (TRC) 5 (Ng/L)
50060
25 Ng/L
2/Week
Grab
E
Dissolved Oxygen (DO) (mg/L)
00300
Weekly
Grab
U & D 8
Temperature (°C)
00010
Weekly
Grab
U & D 8
Total Kjeldahl Nitrogen (TKN) I (mg/L)
00625
Monitor & Report
2/Month
Composite
E
Nitrite/Nitrate Nitrogen 7 (mg/L)
00630
Monitor & Report
2/Month
Composite
E
Total Nitrogen (TN) 7 (mg/L)
C0600
Monitor & Report
2/Month
Calculated
E
TN Load 3,7 (Ib/mo)
TN = TMF x TN x 8.34 (Ib/yr)
QM600
QY600
Monitor & Report
Monthly
Calculated
E
Monitor & Report
Annually
Calculated
E
Total Phosphorus (TP) 8 (mg/L)
C0665
2.0 mg/.L (quarterly average)
2/Month
Composite
E
pH (su)
00400
> 6.0 and < 9.0 standard
— units
Weekly
Grab
E
Combined radium -226 and radium -228 9,10
Ci/L
11503
5 pCdL (annual average)
Quarterly
Grab
E
Alpha emitters, excluding radon
and uranium 9,10 Ci/L
82077
15 pCi/L (annual average)
Quarterly
Grab
E
Beta emitters, excluding potassium -40 and
other naturally occurring radionuclides 9,1°
Ci/L
03520
50 pCi/L (annual average)
Quarterly
Grab
E
Strontium -90 9,10 (pCi/L)
13501
8 pCi/L (annual average)
Quarterly
Grab
E
Tritium 9,10 (pCi/L)
82126
20,000 pCi/L
annual average)
Quarterly
Grab
E
Uranium 9,11(Ng/L)
1 22708
30 pg/IL (weekly average)
I Quarterly
I Grab
I E
Page 3 of 9
Permit NCO058505
Footnotes:
1 The Permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR
application system. See Special Condition A. (7.).
2 The daily flow is measured by two recorders, one on each unit, added together and reported on the
discharge monitoring report (DMR). A calculated monthly average of the reported daily rate based
only on the days a flow is reported on the DMR. The summation of the reported daily flows in a given
month (TMF) is reported on the DMR.
3. TN Load is the mass load of Total Nitrogen discharged in a given period of time. See condition A. (3.),
Calculation of TN Load. Compliance with this allocation shall be determined in accordance with
condition A. (4.) and A. (5.).
4. Fecal Coll -form shall be calculated using the geometric mean, according to the procedure detailed in
Part II. Section A.
5. Limits and monitoring for Total Residual Chlorine will apply only if chlorine or a chlorine derivative
is added to the waste stream during the treatment process. See Condition A. (6.) for instructions
should the facility's permitted UV system fail and an alternate means of disinfection is required.
When chlorine or a chlorine derivative are added the facility shall report all effluent TRC values
reported by a NC certified laboratory including field certified. However, effluent values below 50 pg/L
will be treated as zero for compliance purposes.
6. Upstream = at least 100 feet upstream from the outfall. Downstream = 0.3 mile downstream from
the outfall
7. For a given wastewater sample, TN = TKN + (NO2-N + NO3-N), where TN is Total Nitrogen and TKN is
Total Kjeldahl Nitrogen, and (NO2-N + NO3-N) is Nitrite/Nitrate Nitrogen.
8. The quarterly average for total phosphorus shall be the average of all composite samples collected
twice a month for each calendar quarter (January -March, Apnl-June, July -September, October -
December).
9. All quarterly samples shall be taken 72 to 80 hours after the introduction of offsite wastewater into
the equalization tank.
10. If the quarterly value exceeds 4 times the annual average limit then (a) the sampling frequency shall
increase to monthly and (b) a written notification shall be sent to the Wastewater Permitting Branch
of the Water Quality Permitting Section and the Raleigh Regional Office.
11. A quarterly value can be determined from one quarterly sample or it can be determined from the
average of multiple samples taken in a period not to exceed 7 consecutive days during the quarter.
Conditions•
• All samples collected should be from a representative discharge event.
• There shall be no discharge of floating solids or visible foam in other than trace amounts.
A. (2.) CALCULATION OF TOTAL NITROGEN LOADS
[G.S. 143-215.1(b)]
a. The Permittee shall calculate monthly and annual TN Loads as follows:
i. Monthly TN Load (pounds/month) = TN x TMF x 8.34
Where:
TN = average TN concentration (mg/L) of the composite samples collected
during the month
TMF = Total Monthly Flow of wastewater discharged during the month
(MG/month)
8.34 = conversion factor, from (mg/L x MG) to pounds
ii. Annual TN Load (pounds/year) = Sum of the 12 Monthly TN Loads for the
calendar year
Page 4 of 9
Permit NC0058505
b. The Permittee shall report monthly Total Nitrogen results (mg/L and
pounds/month) in the discharge monitoring report for that month and shall report
each year's annual results (pounds/year) in the December report for that year.
A. (3.) ANNUAL LIMITS FOR TOTAL NITROGEN
[G.S. 143-215.1(b)]
a. Total Nitrogen (TN) allocations and TN Load limits for NPDES dischargers in the
Neuse River basin are annual limits and are applied for the calendar year.
b. For any given calendar year, the Permittee shall be in compliance with the annual
TN Load limit in this Permit if:
i. the Permittee's annual TN Load is less than or equal to said limit, or
ii. the Permittee is a Co -Permittee Member of a compliance association.
c. The TN Load limit in this Permit (if any) may be modified as the result of allowable
changes in the Permittee's TN allocation.
i. Allowable changes include those resulting from purchase of TN allocation from
the Wetlands Restoration Fund; purchase, sale, trade, or lease of allocation
between the Permittee and other dischargers; regionalization; and other
transactions approved by the Division.
ii. The Permittee may request a modification of the TN Load limit in this Permit to
reflect allowable changes in its TN allocation. Upon receipt of timely and proper
application, the Division will modify the permit as appropriate and in accordance
with state and federal program requirements.
iii. Changes in TN limits become effective on January 1 of the year following permit
modification. The Division must receive application no later than August 31 for
changes proposed for the following calendar year.
iv. Application shall be sent to:
NCDWR / NPDES Programs
Attn: Neuse River Basin Coordinator
1617 Mail Service Center
Raleigh, NC 27699-1617
d. If the Permittee is a member and co -permittee of an approved compliance
association, its TN discharge during that year is governed by that association's
group NPDES permit and the TN limits therein.
i. The Permittee shall be considered a Co -Permittee Member for any given calendar
year in which it is identified as such in Appendix A of the association's group
NPDES permit.
ii. Association roster(s) and members' TN allocations will be updated annually and
in accordance with state and federal program requirements.
iii. If the Permittee intends to join or leave a compliance association, the Division
must be notified of the proposed action in accordance with the procedures
defined in the association's NPDES permit.
(1) Upon receipt of timely and proper notification, the Division will modify the
permit as appropriate and in accordance with state and federal program
requirements.
Page 5 of 9
Permit NCO058505
(2) Membership changes in a compliance association become effective on
January 1 of the year following modification of the association's permit.
e. The TN monitoring and reporting requirements in this Permit remain in effect until
expiration of this Permit and are not affected by the Permittee's membership in a
compliance association.
A. (4.) TOTAL NITROGEN ALLOCATIONS
[G.S. 143-215.1(b)]
a. The following table lists the Total Nitrogen (TN) allocation(s) assigned to, acquired by, or
transferred to the Permittee in accordance with the Neuse River nutrient management
rule (T15A NCAC 02B .0234) and the status of each as of permit issuance. The allocations
listed here do not constitute a discharge limit; any such limit is as established in the
Effluent Limitations and Monitoring Requirements of this permit. For compliance
purposes, this table does not supercede any TN limit(s) established elsewhere in this
permit or in the NPDES permit of a compliance association of which the Permittee is a Co-
Permiitee Member.
ALLOCATION
ALLOCATION AMOUNT (1)
TYPE
SOURCE
DATE
STATUS
Estuary (Ib/yr)
Discharge (Ib/yr)
Base
Assigned by Rule
12/7/97;
1,011
2,022
Active
(T1 5A NCAC 02B 0234)
4/1/03
TOTAL
1,011
2,022
Active
Footnote:
(1) Transport Factor = 50%
b. Any addition, deletion, or modification of the listed allocation(s) (other than to correct
typographical errors) or any change in status of any of the listed allocations shall be
considered a major modification of this permit and shall be subject to the public review
process afforded such modifications under state and federal rules.
A. (5.) TEMPORARY MEANS OF DISINFECTION
[G.S. 143-215.1(a)]
In the event that the wastewater treatment plant's ultraviolet (UV) disinfection system should
fail, underperform, or otherwise be removed from effective service, the permittee or his agent
should immediately inform the Surface Water Protection Section staff of the Raleigh Regional
Office of this development and discuss temporary, alternate means for disinfection of the
effluent.
If chlorine compounds are used as temporary means of disinfection, the total residual
chlorine (TRC) concentration of the effluent must be monitored daily while this method of
disinfection is in use and TRC values must be reported on the discharge monitoring report.
TRC in the effluent may not exceed the permit limit; therefore, dechlorination methods may
also be necessary to ensure protection of water quality in the receiving stream.
Page 6 of 9
Permit NCO058505
Use of a disinfection system other than the permitted UV system during circumstances not
deemed as emergency and/or temporary (replacement of lamps, lamp cleaning or
maintenance, etc.) will be considered a violation of the terms of this permit.
A. (6.) REOPENER CLAUSE
[G.S. 143-215.1(b)]
The Division of Water Resources may reopen this permit to increase monitoring, add
additional parameters of concern, and/or implement additional limits should effluent data or
surface water data indicate potential impacts, or should further information on radiological
components become available.
A. (7.) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
[NCGS 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. Reporting Requirements [Supersedes Section D. 12.1 and Section E. (5.) (a)1
The permittee shall report discharge monitoring data electronically using the NC DWR's
Electronic Discharge Monitoring Report (eDMR) internet application.
Monitoring results obtained during the previous month(s) shall be summarized for each
month and submitted electronically using eDMR. The eDMR system allows permitted
facilities to enter monitoring data and submit DMRs electronically using the internet.
Until such time that the state's eDMR application is compliant with EPA's Cross -Media
Electronic Reporting Regulation (CROMERR), permittees will be required to submit all
discharge monitoring data to the state electronically using eDMR and will be required to
complete the eDMR submission by printing, signing, and submitting one signed original
and a copy of the computer printed eDMR to the following address:
NC DENR / Division of Water Resources / Water Quality Permitting Section
ATTENTION: Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to
the facility being physically located in an area where less than 10 percent of the
households have broadband access, then a temporary waiver from the NPDES electronic
reporting requirements may be granted and discharge monitoring data may be submitted
Page 7 of 9
Permit NCO058505
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 mailing address above. See "How to
Request a Waiver from Electronic Reporting" section below.
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, 2020, the permittee must electronically report the following
compliance monitoring data and reports, when applicable:
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(1'1(9), the permittee must identify the 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 NPDES-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 electronic reporting tool
for each type of electronic submission and for each state. Instructions on how to access and
use the appropriate electronic reporting tool will be available as well. Information on EPA's
NPDES Electronic Reporting Rule is found at:
https:/ /www.federalregister.gov/documents/2015/ 10/22/2015-24954/national-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 submit an electronic reporting
waiver request to the Division. Requests for temporary electronic reporting waivers must
be submitted in writing to the Division for written approval at least sixty (60) days prior to
the date the facility would be required under this permit to begin submitting monitoring
data and reports. The duration of a temporary waiver shall not exceed 5 years and shall
thereupon expire. At such time, monitoring data and reports shall be submitted
electronically to the Division unless the permittee re -applies for and is granted a new
temporary electronic reporting waiver by the Division. Approved electronic reporting
waivers are not transferrable. Only permittees with an approved reporting waiver request
Page 8 of 9
Permit NC0058505
may submit monitoring data and reports on paper to the Division for the period that the
approved reporting waiver request is effective.
Information on eDMR and the application for a temporary electronic reporting waiver are
found on the following web page:
http: / / deg.nc. gov /about/ divisions/water-resources / edmr
4. Signatory Requirements [Supplements Section B. (11.) (b) and Supersedes Section B.
(11.) (d)]
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 an
eDMR user account, please visit the following web page:
http: / / deg.nc. gov /about/ divisions/water-resources / edmr
Certification. Any person submitting an electronic DMR using the state's eDMR system
shall make the following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF
CERTIFICATION WILL BE ACCEPTED:
7 certify, under penalty of law, that this document and all attachments were prepared under
my direction or supervision in accordance with a system designed to assure that qualified
personnel properly gather and evaluate the information submitted. Based on my inquiry of
the person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and
belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing
violations. "
5. Records Retention [Supplements Section D. (6.)1
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR
submissions. These records or copies shall be maintained for a period of at least 3 years
from the date of the report. This period may be extended by request of the Director at any
time [40 CFR 122.411.
Page 9 of 9
Outfall 001
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Aqua North Carolina, Inc.
Mallards Crossing WWTP
Receiving Stream: Neuse River
Latitude: 352 50' 58" N Stream Class: C, NSW
Longitude: 782 29' 45" W Sub -basin: 03-04-02
Facility
Location
(not to scale)
NPDES Permit NC0058505
North Wake County