NC0083551_Change Page to Correct Error_20171222

Water Resources
ENVIRONMENTAL QUALITY
ROY COOPER
corernot
MICHAEL S REGAN
Sect etaq
LINDA CULPEPPER
Into rm Du ectot
December 22, 2017
Mr. Jeffrey L. Hudson, Executive Director
Onslow Water and Sewer Authority
228 Georgetown Road
Jacksonville, NC 28540
Subject: Change -Page to Correct Error
NPDES Permit NCO083551
Onslow Water and Sewer Authority
Dixon Water Treatment Plant (WTP)
Onslow County
Dear Mr. Hudson.
The Division of Water Resources (the Division) became aware of an error in your recently issued permit
(effective January 1, 2018). A review of North Carolina Statute 15A NCAC 02B .0505(c)(3)(A) noted that
instream monitoring should utilize grab samples while effluent samples should consist of composite
samples.
Accordingly, we hereby forward the modified permit pages to amend your permit changing sample type to
grab for upstream and downstream monitoring for salinity and conductivity and have removed the
compliance schedule, formerly footnote #3 Please insert these change pages into your existing permit and
discard the old pages We regret any inconvenience this causes your organization.
Please note that this permit is not transferable except after notice to the Division. The Division may require
modification or revocation and reissuance of the permit. This permit does not affect the legal requirements
to obtain other permits which may be required by the Division of Water Resources or any other Federal,
State, or Local governmental permits that may be required.
If you have questions, or if we can be of further service, please contact Bnanna Young at
[e-mail] or call [phone].
Res ct lly,
nda Culpe er, Interim Director
ll Division of Water Resources, NCDEQ
Enclosure NPDES Permit NCO083551 (Corrected Pages)
he Central Files
NPDES Program Files
Wilmington Regional Office
ec Aquatic Toxicology Unit, Susan Meadows [susan meadows@ncdenr gov]
David Mohr, ONWASA [dmohr@onwasa com]
Edward Caron, ONWASA [ecaron@onwasa com]
James McDonnel, ONWASA Dmcdonnel@onwasa com]
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 NC0083551
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 discharge from outfall 001. Such discharges shall be limited and monitored'
by the Permittee as specified below:
EFFLUENT CHARACTERISTICS
(Parameter Codes)
LIMITS
Monthly Daily
Average Maximum
MONITORING REQUIREMENTS
Measurement Type Sample T e Sample
Frequency p Location2
Flow
(50050)
Continuous
Recording
E
Salim
00480
Monthly
Composite
E
Salinity
00480
Monthly
Grab
U, D
Conductivity
00094
Monthly
Composite
E
Conductivity
00094
Monthly
Grab
U, D
Total Dissolved Solids
70295
Monthly
Composite
E
Dissolved Oxygen
00300
Monthly
Grab
E, U, D
H
00400
6.8 s.0:5 H <_ 8.5 s.u.
2/Month
Grab
E
H
00400
Monthly
Grab
U, D
Total Residual Chlorine 3
50060
13 /L
2/Month
Grab
E
Total Suspended Solids
C0530
10.0 m /L 15.0 m /L
2/Month
Composite
E
Turbidity
00070
2/Month
Grab
E
Total Arsenic
01002
5 /L 34.5 /L
Monthly
Grab
E
Total Chloride
00940
Monthly
Composite
E
Total Manganese
01055
Monthly
Composite
E
Total Zinc
01092
42.8 /L 47.6 /L
Monthly
Composite
E
Total Copper
01042
Quarterly
Composite
E
Total Lead
01051
Quarterly
Composite
E
Total Nitrogen
C0600
Quarterly
Composite
E
Total Phosphorus
C0665
Quarterly
Composite
E
Ammonia Nitrogen a
C0610
Monthly
Composite
E
Whole Effluent Toxicity
Monitoring s
(TGE3E)
Monitor & Report
Quarterly
Composite
E
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using the Division's eDMR
application system [see A. (4)].
2. E = Effluent; U = Upstream at least 100 feet upstream from the outfall; D = Downstream at least 100 feet
downstream from the outfall.
3. Limit and monitor only if the facility adds chlorine or chlorine derivatives to water that is eventually
discharged. The Division shall consider all effluent TRC values reported below 50 µg/L 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 µg2.
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Permit NC0083551
4 Ammonia Nitrogen should be monitored if the Permittee uses chloramines (adds ammoma to chlorinated
water) for secondary disinfection prior to backwashing.
5 Acute Toxicity 24 -hr Pass/fail Monitoring: January, April, July, and October. Permittee shall use mysid
shrimp as the test organism unless another organism of equal or greater sensitivity is deemed more
appropriate based on the characteristics of the discharge and receiving stream. See Special condition A.
(2) for details.
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.
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