NC0023965_Modification_19960909

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
September 9. 1996
Mr. Hugh T. Caldwell
Director of Public Utilities
P.O. Box 1810
Wilmington. North Carolina 28402
Subject: NPDES Permit Modification
Permit No. NC0023965
James A. Loughlin Plant
New Hanover County
Dear Mr. Calchvell:
On July S. 1996 the Division of Water Quality issued NPDES Permit No. NC0023965 to the City of
Wilmington for their Northside Wastewater Treatment Plant. A review of the permit file has indicated that an error
was inadvertently made in the permit. Accordingly. mve are forwarding herewith modifications to the subject permit
to correct the error. This permit modification is to the effluent page. The modification changes the effluent mercury
sample type from grab to composite.
Please find enclosed an amended effluent pave which should be inserted into your permit. The old page should be
discarded. All other terms and conditions contained in the original permit remain unchanged and in full effect. These
permit modifications are issued pursuant to the requirements of North Carolina General Statutes 143-215.1 and the
Memorandum of Agreement between North Carolina and the U. S. Environmental Protection Agency.
If any parts, measurement frequencies or sampling requirements contained in this permit modification are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days
following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B
of the North Carolina General Statutes. and filed with the Office of Administrative Hearings, Post Office Drawer
27447. Raleigh. North Carolina 27611-747. Unless such demand is made. this decision shall be final and binding.
If you have any questions concerning this permit modification. please contact Mr. Mark McIntire at telephone
number [phone]. extension 553.
Sincerely,
Preston Howard. Jr., P.E.
t�
cc. Mooresville Regional Office / Water Quality Section
Central Files _
Pernuts and EneineerineUnit / PermitFile
Facility Assessment Unit
Aquatic Survey and Toxicology Unit
P.O. Box 29535. Raleigh. North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% Recycled/ 10% post -consumer paper

A. O. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL
Permit No. NCO023965
During the period beginning on the effective date of the pencil :md lasting until expiration, the Permittce is authorized to discharge from
outfall(s) serial number 001. Such discharges shall he limilcd and monitored by the permittcc as specified below:
E(tluent Characteristics
Flow
BOD, 5 day, 20°C"
Total Suspended Residue"
NH3 as N
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Total Nitrogen (NO2 + NO3 + TKN)
Total Phosphorus
Acute Toxicity —
Copper
Discharge— Umitation5
Monthly Av -.
8.0 MIGD
30.0 mg/I
30.0 mg/I
200.01100 ml
Weekly Avg_
45.0 mg/I
45.0 mg/I
400.0 /100 ml
Monitoring Requirements
Measurement
Sample
'Sample
Daily Max Frequency
Type
Location
Continuous
Recording
I or E
Daily
Composite
E, I
Daily
Composite
E, I
Weekly
Composite
E
Daily
Grab
E
Daily
Grab
E
Daily
Grab
E
Monthly
Composite
E
Monthly
Composite
E
Quarterly
Composite
E
Monthly
Composite
E
'J:Sample locations: E - Effluent, I - Influent, U - Upstream (U I - Upstream in the NE Cape Fear River at HWY 421 crossing, U2 - Upstream
al Muddy Point), D - Downstream at Poll Authority. The penniuce has the option of contracting with the Cape Fear River Program to perform
the instream monitoring regime.
**The monthly average effluent BODS concentration shall not exceed 18%of the respective influent value (82% removal) and the monthly
average Total Suspended Residue concentration shall not exceed 27 %, of the respective influent value (73 % removal).
** Acute Toxicity (Daphnia Pulex) PIF at 90%; February, May, August and November; See Part 111, Condition G.
The pl-I shall not be less than 6.0 standard units nor greater than 8.5 standard units and shall he monitored daily at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. O. IiI-f'LUGN'I' LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO023965
During the period heginning on the effective date of the permit and lasting until expiration, the Permiltce is authorized to discharge from
oulfall(s) serial numher 001. (Continued)
_Effluent_ Characteri_$it tcs.
Cyanide
Mercury
Silver
Dissolved Oxygen
Dissolved Oxygen
Temperature
Mercury
Disc harge_Limitations Monitoring Requirements
Units_(specifyd Measurement Sample 'Sample
Monthly Avg. Weekly --Avg, Daily Max Frequency Type Location
Monthly Grab E
Monthly Composite E
Monthly Composite E
Weekly Grab E
Weekly Grab U,D
Weekly Grab U,D
Monthly Grab U,D