NC0021369_Permit Modification_20040116

NIMES DOCUHENT !;CANNINL COVER :SHEET
Permit:
NC0021369
Columbus WWTP
NPDES
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification `' >
f
Complete File - Historical
Engineering Alternatives (EAA)
Return
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
January 16, 2004
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G awn
NCDENR
Mr. Glenn M. Rhodes
Town Administrator
Post Office Box 146
Columbus, North Carolina 28722
Dear Mr. Rhodes:
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
January 16, 2004
Subject: Modification of NPDES Permit NC0021369
Columbus WWTP
Polk County
The Division issued the subject permit on November 12, 2003. That permit contained a requirement for
quarterly mercury monitoring. We received your request to change the mercury sample type from Composite to Grab
on December 5, 2003. The Division is granting your request.
This modification changes the sample type for Mercury to Grab. No other changes to the permit have been
made.
Please find enclosed the revised page, which should be inserted into your permit. The old page may then be
discarded. All other terms and conditions contained in the original permit remain unchanged and in full effect. This
permit modification is issued under 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 a written petition conforming to Chapter 150B of the North
Carolina General Statutes, 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.
If you have any questions concerning this permit modification, please contact Charles Weaver of the NPDES
Unit at [phone], extension 511.
cc: Central Files
Asheville Regional;:Office, Water Quality Section
NPDES Unit r
Aquatic Toxicology Unit
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Alan W. Klimek, P.E.
Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Visrr us ON THE iNTERNEr © http://h2o.enr.state.nc.us/NPDES

a.
Permit NC0021369
A. (1.) EFFLUENT LINIITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit 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:
EFFLUENT
CHARACTERISTICS
LIMIT S
MONITORING REQUIREMENTS
si�Q�nthly;
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Type
Sample L_acal{t
Flow
0.80 MGD
Continuous
Recording
Influent or Effluent
BOD, 5-day (20°C)'
30.0 mg/L
45.0 mg/L
Weekly
Composite
Effluent, Influent
Total Suspended Solids'
30.0 mg/L
45.0 mg/L
-
Weekly
Composite
Effluent, Influent
NH3 as N
Weekly
Composite
Effluent
Fecal Coliform
(geometric mean)
200 / 100 ml
400 / 100 ml
Weekly
Grab
Effluent
Dissolved Oxygen
Weekly
Grab
Effluent
Temperature (QC)
Weekly
Grab
Effluent
Total Residual Chlorine
28 µg/L2
2/Week
Grab
Effluent
pH
Between 6.0 and 9.0 standard units
Weekly
Grab
Effluent
Total Nitrogen (NO2 + NO3 + TKN)
2/Year
Composite
Effluent
Total Phosphorus
2/Year
Composite
Effluent
Total Copper
Monthly
Composite
Effluent
Total Silver
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
Total Cadmium
Quarterly
Composite
Effluent
Total Cyanide
Quarterly
Grab
Effluent
Total Lead
Quarterly
Composite
Effluent
Total Mercury
Quarterly
Grab
Effluent
Chronic Toxicity3
Quarterly
Composite
Effluent
Notes:
1. The monthly average effluent BOD and Total Suspended Solids concentrations shall not exceed
15% of the respective influent value (85% removal).
2. The limit for total residual chlorine takes effect June 1, 2005.
3. Chronic toxicity (Ceriodaphnia) P/F test at 37% shall be conducted in March, June, September
and December [see A. (2.) for more information].
There shall be no discharge of floating solids or visible foam in other than trace
amounts.

TOWN OF COLUMBUS IN
P.O. BOX 146
COLUMBUS, NORTH CAROLINA 28722
828-894-8236
FAX: [phone]
November 18, 2003
Ve----/
. Alan W. Klimeck, PE
.C. Department of Environment & Natural Resources
N.C. Division of Water Quality/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Mr. Klimeck:
200] D
Re: Permit NC0021369
Columbus WWTP, Polk County
I am writing to request that the above referenced permit be amended. We are requesting
authorization to use a grab sample instead of the composite sample for total mercury.
We feel this change will reduce the Town's cost, while maintaining the same standards.
Should you have questions, please call me at 828-894-8236.
Sincere y,
Glenn M. Rhodes
Town Administrator
GMR/db
DEC 5 2003