NC0062855_Technical Correction_20050610

Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
June 10, 2005
Mr. James R. Britt, Jr.
Town Administrator
Town of Robbins
P.O. Box 296
Robbins, North Carolina 27325
Subject: NPDES Permit Correction
Permit Number NCO062855
Robbins WWTP
Moore County
Dear Mr. Britt:
The Division issued an NPDES permit modification for NCO062855 to the Town Of Robbins on May 6,
2005. It has come to our attention that the issued permit contains an error in the omission of a footnote indicating
when Method 1631 must be used for analyses of total mercury. This method must be used only when the Town
begins discharging at the 1.3 MGD flow. As long as the W WTP is operating under the 0.5 MGD effluent limitations
and monitoring requirements, Method 1631 is not required.
In accordance with our review, the Division is forwarding herewith a correction to the subject permit.
Enclosed please find the modified effluent permit page. This page should be inserted into youf 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 May 9, 1994 (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 concerning this permit, please contact Mrs. Dawn Jeffries at telephone number
[phone], extension 595.
Sincerely
� o
Alan W. Klimek P.E.
Enclosure: Permit Correction
cc: Fayetteville Regional Office, Water Quality
Aquatic Toxicology Unit
Central Files
NPDES Permit File
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
VISIT US ON THE WEB AT http://h2o.enr.state.nc.us/NPDES

Permit NO0062855
A. (2.� EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - FINAL
During the period beginning upon written authorization by the Division of Water Quality to increase flow
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:
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Flow
1.3 MGD
Continuous
Recording
Influent or Effluent
BOD, 5 day, 20°C2
21.0 mg/L
31.0 mg/L
3/Week
Composite
Influent and Effluent
Total Suspended Solids2
21.0 mg/L
31.0 mg/L
3/Week
Composite
Influent and Effluent
NH3 as N
6.0 mg/L
18.0 mg/L
3/Week
Composite
Effluent
Dissolved Oxygen3
3/Week
Grab
Effluent,
Upstream & Downstream
pH4
3/Week
Grab
Effluent
Temperature °C
Daily
Grab
Effluent,
Up stream & Downstream
Fecal Coliform
(geometric mean
200/ 100 ml
400/100 ml
3/Week
Grab
Effluent
Total Residual Chlorine
28 Ng/I
3Meek
Grab
Effluent
Conductivity
3/Week
Grab
Effluent
Oil & Grease
30.0 mg/L
Weekly
Grab
Effluent
Total Nitrogen .
(NO2+NO3+TKN)
Monthly
Composite
Effluent
Total Phos horus5
1.0 mg/L
Weekly
Composite
Effluent
Total Mercu 6
2/Month
Composite
Effluent
Total Cyanide
Monthly
Grab
Effluent
Total Copper
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
Chronic Toxicity,
Quarterly
Composite
Effluent
Notes:
1. Upstream = at NCSR 1456. Downstream = at High Falls Dam (above NC Highway 22 bridge). Upstream and
downstream samples shall be grab samples collected 3/week during June, July, August and September, and weekly
during the rest of the year.
2. The monthly average effluent BODS and Total Suspended Residue concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/L
4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
5. Compliance shall be based upon a quarterly average of weekly samples.
6- Analyses for total mercurymtut be performed using EPA Method 1631.
Z- Chronic Toxicity (Cer�) limit at 10% with testing in January, April, July and October (see A. (4)).
There shall be no discharge of floating solids or visible foam in other than trace amounts.