NC0026611_Technical Correction_20071130

NPDES DOCYNENT :SCANNING; COVER SHEET
NPDES
Permit:
NC0026611
Morehead City WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
'Technical Correction
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
November 30, 2007
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Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
November 30, 2007
Mr. Stephen C. Hamilton
Town of Morehead City
706 Arendell St.
Morehead City; North Carolina 28557
Subject: Correction of NPDES Permit
Permit no. NC0026611
Morehead City WWTP
Carteret County
Dear Mr. Hamilton:
The Division rFceived your letter of November 2, 2007 concerning the permit issued on October
12, 2007, specifically questioning the appropriate sample type for mercury. The issued permit
required a composite sample but in the past the requirement was a grab sample. The Division
agrees that this was an error and the sample type for mercury should be grab instead of
composite. Enclosed find a corrected page for the Effluent Limitations and Monitoring
Requirements Please replace this page in your permit.
You also inquired about the water quality standards or limits the facility would be aiming for
when testing for cyanide, mercury, copper, and zinc. Since the facility discharges into tidal
waters the standards are applied without dilution. The applicable standards are 1 µg/1 for
cyanide, 0.025 µg/1 for mercury, 6 µg/1 for copper, and 67 µg/1 for zinc.
If any parts, measurement frequencies or sampling requirements contained in this permit 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 (6714 Mail Service Center, Raleigh, North Carolina 27699-
6714). Unless such demand is made, this decision shall be final and binding.
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 Quality or permits required by the Division of Land Resources, the Coastal Area
Management Act or any other Federal or Local governmental permit that may be required.
NorthCaro ina
Naturally
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]

Permit No. NC0026611
Town of Morehead City
Page 2
If you have any questions concerning this permit, please contact Teresa Rodriguez at telephone
number [phone], extension 553.
Sincerely,
/il
_Cr
Coleen H. Sullins
Cc: NPDES Files
Central Files
U.S. EPA Region 4
Wilmington Regional Office
Aquatic Toxicology Unit
PERCS Unit

Permit No. NC0026611
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning on the effective date of this permit and lasting until expiration or expansion above 1.7
MGD, the Permittee is authorized to discharge treated wastewater from Outfall 001. Such
discharges shall be limited and monitored by the Permittee as specified below:
PARAMETER
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample
p 1
Location
Flow (MGD)
1.7
Continuous
Recording
I or E
BOD5 (Summer)2,3
20.0 mg/L
30.0 mg/L
3/Week
Composite
I, E
BOD5 (Winter)2,3
30.0 mg/L
45.0 mg/L
3/Week
Composite
I, E
Total Suspended Solids2
30.0 mg/L
45.0 mg/L
3/Week
Composite
I, E
NH3 as N
Weekly
Composite
E
Dissolved Oxygen
Daily average not less than 5.0 mg/L
3/Week
Grab
E
Fecal Coliform
86/100 ml
172/100 ml
3/Week
Grab
E
Total Residual Chloiine4
13 ug/L
3/Week
Grab
E
Enterococci (geometric
mean)
35/100 ml
276/100 ml
3/Week
Grab
E
Temperature
Daily
Grab
E
Total Nitrogen
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
pH
Between 6.8 and 8.5 Standard Units
3/Week
Grab
E
Total Cyanide5.6
Quarterly
Composite
E
Total Mercury6
Quarterly
Grab
E
Total Copper
2/Month
Composite
E
Total Zinc
2/Month
Composite
E
Acute Toxicity?
Quarterly
Composite
E
Footnotes:
1. I: Influent. E: Effluent. See condition A. (3) of this permit for instream monitoring requirements.
2. The monthly average BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. Summer shall l?e defined as April 1 — October 31 with winter defined as the balance of the year.
4. See Condition �.(4.)
5. The Division shall consider all cyanide values reported below 10 µg/1 to be "zero" for compliance
purposes. Hovever, Discharge Monitoring Reports (DMRs) shall record all values reported by a North
Carolina-certif ed laboratory (even if these values fall below 10 µg/1.)
6. Effluent moni oring may be deleted in the future upon written notification of the Division, if the
permittee pro des updated effluent data (at least 12 data points) that shows no reasonable potential to
exceed applica b le state water quality standards.
7. Acute Toxicity (Mysidopsis bahia) P/F, February, May, August and November; see special condition A.
(5.) of this permit.
THERE SHALL BE
AMOUNTS.
NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE
Page 4

DEMOS L. THOMPSON, Mayor Pro-Tem
Council
GEORGE W. BALLOU
PAUL W. CORDOVA
DAVID HORTON
JOHN F. NELSON
November 2, 2007
MOREHEAD CI
NORTH CAROLINA
Ms. Teresa Rodriguez
NPDES Unit / NCDWQ
1617 Mail Service Center
Raleigh, NC 27699-1617
706 Arendell Street
Morehead City, North Carolina 28557-4234
TEL [phone]
FAX [phone]
www.townofmorehead.com
GERALDA. JONES, JR., Mayor
R. RANDY MARTIN
City Manager
[
DF?4R • Yir"•.T'R QUALITY
Re: NPDES Permit Number NC0026611 / Morehead City WWTP / Carteret County
Dear Ms. Rodriguez,
We have one comment concerning the recently issued permit and would like some
additional information concerning some of the parameters.
First, in the past, the low-level mercury testing was done on a grab sample; the new
permit specifies a composite sample, is this correct?
Second, can you provide us with the water quality standards, goals or limits we are
aiming for with the cyanide, mercury, copper and zinc testing? This information will be
helpful in assuring compliance in the future.
Thank you in advance for your help.
Yours truly,
Stephen C. Hamilton
Director of Public Utilities
ADA/EOE/P Equal Opportunity Employee Provider