NC0007552_Permit (Modification)_20150410

NPDES DOCUNENT SCANNlNS COVER SHEET
NPDES Permit: NC0007552
Document Type: Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Staff Report
Instream Assessment (67B)
Environmental Assessment (EA)
Permit
History
Document Date: April 10, 2015
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NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory Donald R. van der Vaart
Governor Secretary
April 10, 2015
Ms. Anne-Marie Knighton,Town Manager
Town of Edenton
P.O. Box 300
Edenton,NC 27932
Subject: Change-Page to Correct Error
NPDES Permit NC0007552
Freemason WTP
Chowan County
Dear Ms. Knighton:
The Division of Water Resources(the Division)became aware of an error in your recently issued permit(October
15, 2014). According to our water treatment plant permitting strategy, Total Nitrogen(TN) and Total Phosphorous
(TP) monitoring is quarterly.
Accordingly, we hereby forward the modified permit pages to amend your permit changing TN and TP monitoring
to quarterly. 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 Derek Denard at
[[e-mail]] or call(919) 807-6307.
Respe tfully,
S. Jay Zimmerman, Diredtor
Division of Water Resources, NCDENR
Enclosure: NPDES Permit NCO007552 (Corrected Pages)
he: Central Files
NPDES Program Files
WaRQ Files/Attn: David May
ec: Aquatic Toxicology Unit,Susan Meadows[[e-mail]]
Robert Bullock[[e-mail]]
Scott,Vinson[[e-mail]]
1617 Mail Service Center,Raleigh,North Carolina 27699-1617
Phone:[phone] k Internet:www.rmaterqualily.org
An Equal Opporlunily 4 Affirmative Action Employer—Made in part by recycled paper

t NPDES Permit NCO007552
T PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge filter backwash via Outfall 001. Such discharges shall be limited
and monitored' by the Permittee as specified below:
7.
EFFLUENT., - _ LIMITS ,,MONITORING REQUIREMENTSI— _..
CHARACTERISTIC Monthly._ , Daily -Measurement Sample Sample
[PARAMETER CODES[ Average Maxirhum, Frequency Type Location Z
Flow 3 MGD 50050 2/Month Instantaneous E
Total Residual Chlorine 4 /L 50060 17 L 4 2/Month Grab E
Not<6.6or>9.0
PH(su) 00400 2/Month Grab E
standard units
Total Suspended Solids(TSS)(mg/L) C0530 30.0 mg/L 45.0 mg/L 2/Month Grab E
Total Dissolved Solids(TDS)(mg/L) 70295 Monthly Grab E
Turbidity(NTU) 00070 Monthly Grab E
Temperature(°C) 00010 Monthly Grab E
Dissolved Oxygen(DO)(mg/L) 00300 Monthly Grab E
Salinity(ppt) 00480 Monthly Grab E
Conductivity(umhos/cm) 00094 Monthly Grab E
Total Copper (µg/L) 01042 Monthly Grab E
Total Chloride(mg/L) 00940 Monthly Grab E
Total Manganese(µg/L) 01055 Monthly Grab E
Total Zinc(µg/L) 01092 Monthly Grab E
Total Fluoride(mg/L) 00951 Monthly Grab E
Ammonia Nitrogen(NH3)(mg/L) C0610 Monthly Grab E
Total Nitrogen(mg/L) C0600 Quarterly Grab E
Total Phosphorus(mg/L) C0665 Quarterly Grab E
Chronic WET Testing 5 TGP3B Quarterly Grab E
PH(su) 00400 Monthly Grab U&D
Temperature(°C) 00010 Monthly Grab U&D
Dissolved Oxygen(DO) (mg/L) 00300 Monthly Grab U&D
Salinity(ppt) 00480 Monthly Grab U&D
Conductivity(umhos/cm) 00094 Monthly Grab U&D
Footnotes:
1. No later than 270 days from the effective date of this permit, begin submitting discharge monitoring
reports electronically using NC DWR's eDMR application system. See Special Condition A. (3.).
2. E = Effluent; I = Influent; U=upstream at least 50 feet from the outfall; D =downstream at least
100 feet from the outfall.
3. For instantaneous flow monitoring, the duration of the discharge must be reported in addition to the
total flow.
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NPDES Permit NC0007552
4. The Division shall consider TRC effluent values reported below 50 µg/L to be compliant with the
permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina-certified test method (including field certified), even if these values fall below 50µg/L.
5. Whole Effluent Toxicity(WET) testing- testing of Ceriodaphnia dubia shall be performed as 7-day
pass/fail test at'90% effluent concentration, during January, April,July and October [See A. (2.)].
Samples shall be taken at the outfall but prior to mixing with the receiving waters.
There shall be no discharge of floating solids or foam in other than trace amounts.
Page 4 of 8