NC0026611_Technical Correction_20080624 (2)

F vvH/F
' \O�� 9QG Michael F.Easley,Governor
r William G.Ross Jr.,Secretary
North Carolina Department of Environment and Natural Resources
—i
Coleen H.Sullins,Director
Division of Water Quality
June 24,2008
Mr.Stephen C.Hamilton
Town of Morehead City
706 Arendell Street
Morehead City,North Carolina 28557
Subject: NPDES Permit Correction
Permit Number NCO026611
Morehead City WWTP
Carteret County
Dear Mr.Hamilton:
The Division issued NPDES permit NCO026611 to the Town on October 12,2007. It has come to our
attention the sample type for cyanide should be changed to grab from composite. This permit correction revises the
sample type for cyanide.
Enclosed please find the revised permit pages. These pages should be inserted into your permit and the old
ones discarded.This permit modification is issued pursuant to the requirements of North Carolina General Statute
143-215.1 and the Memorandum of Agreement between North Carolina and the U.S.Environmental Protection
Agency dated October 15,2007(or as subsequently amended).
Please take notice that this permit is not transferable. This permit does not affect the legal requirement to
obtain other permits which may be required by the Division of Water Quality or permits required by the Division of
Land Resources,Coastal Area Management Act or any other Federal or Local government permit that may be
required.
If you have any questions,please contact Karen Rust at telephone number(919)733-5083,extension 361.
Sincerely,
Coleen H. Sullins
cc: Wilmington Regional Office/Surface Water Protection
Central Files
NPDES Files
US.EPA Region 4
Aquatic Toxicology Unit
PERCS Unit
NPorthCarolina
Naftimilil
N.C.Division of Water Quality 1617 Mail Service Center Raleigh,North Carolina 27699-1617 Phone: [phone] Customer Service
Intemet: httpJ/h2o.enr state.nc,us 512 N.Salisbury St. Raleigh,NC 27604 Fax: [phone] 1-877-623-6748
An Equal Opportunity/AHinmative Action Employer

Permit No.NCO026611
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:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER Monthly Weekly. Daily Measurement Sample
Average Average Maximum Frequency. Sample Type Location 1
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)21 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 1721100 ml 3/Week Grab E
Total Residual Chlorine4 13 pg/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 Cyanides,6 Quarterly Grab E
Total Mercuryb 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 be defined as April 1—October 31 with winter defined as the balance of the year.
4. See Condition A.(4)
5. The Division shall consider all cyanide values reported below 10 µg/l to be "zero" for compliance
purposes.However,Discharge Monitoring Reports (DMRs) shall record all values reported by a North
Carolina-certified laboratory(even if these values fall below 10 µg/l.)
6. Effluent monitoring may be deleted in the future upon written notification of the Division, if the
permittee provides updated effluent data(at least 12 data points) that shows no reasonable potential to
exceed applicable 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 NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE
AMOUNTS.
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Permit No.Na026611
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Beginning upon expansion above 1.7 MGD, and lasting until expiration, the Permittee is
authorized to discharge treated wastewater from Outfall 001. Such discharges shall be limited and
monitored by the Permittee as specified below:
EFFLUENT LIMITATIONS MONITORING REQUIREMENTS
PARAMETER Monthly Weekly Daily Measurement Sample
Average Average Maximum FrequencySample Type 1
mg Location
Flow(MGD) 2.5 Continuous Recording I or E
BOD3(Summer)2,3 5.0 mg/L T5 mg/L Daily Composite I,E
BOD5(Wmter)2-3 10.0 mg/L 15.0 mg/L Daily Composite I,E
Total Suspended Solids2 10.0 mg/L 15.0 mg/L Daily Composite I,E
NH3 as N(Summer),3 1.0 mg/L 3.0 mg/L 3/Week Composite E
NK as N(Wmter)3 2.0 mg/L 6.0 mg/L 3/Week Composite E
Dissolved Oxygen Daily average not less than 6.0 mg/L Daily Grab E
Fecal Colifonn 14/100 ml 28/100 ml Daily Grab E
Total Residual Chlorine4 13 µg/L Daily Grab E
Entemcocci(geometric mean) 35/100 ml 276/100 ml 3/Week Grab E
Temperature Daily Grab E
Total Nitrogen 41,856 lb/yr Weekly Composite E
Total Phosphorus5 7,610 lb/yr Weekly Composite E
pH Between 6.8 and 8.5 Standard Units Daily Grab E
Total Cyanide6>7 Quarterly Grab E
Total Mercuiy7 Quarterly Grab E
Total Copper 2/Month Composite E
Total Zinc 2/Month Composite E
Acute Toxicitys 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% removai).
3. Summer shall be defined as April 1—October 31 with winter defined as the balance of the year.
4. See Condition A.(4.)
5. Total nitrogen and total phosphorus limits will become effective one year after the expansion to 2.5 mgd
becomes effective.
6. The Division shall consider all cyanide values reported below 10 µg/1 to be "zero for compliance
purposes.However,Discharge Monitoring Reports (DMRs) shall record all values reported by a North
Carolina-certified laboratory(even if these values fall below 10 µg/L)
7. Effluent monitoring may be deleted in the future upon written notification of the Division, if the
permittee provides updated effluent data(at least 12 data points)that shows no reasonable potential to
exceed applicable state water quality standards. .
8. Acute Toxicity(Mysidopsis bahia)P/F,February,May,August and November,see special condition A.
(5) of this permit.
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