NC0038831_Permit Modification_20011019

V&
O� W A TF9 Michael F. Easley
�O� QGGovernor
0)r © ENR William G Ross, Jr, Secretary
North Carolina Department of Environment and Natural Resources
Gregory J. Thorpe, Ph D, Acting Director
Division of Water Quality
October 19, 2001
Mr. Carl Daniel
Carolina Trace Utilities, Inc.
P.O. Box 240705
Charlotte, North Carolina 28224
Subject: NPDES Permit Modification
Permit NC0038831
Carolina Trace WWTP
Lee County
Dear Mr. Daniel:
Division personnel were notified of typographical errors in the perrmt recently issued by the NPDES Unit.
Accordingly, the Division has modified the subject permit as follows:
The effluent pages have been reformatted for clarity.
Please be aware that the Chronic Toxicity test requirement at Part I. A. (3.) takes effect when the facility expands
to a permitted flow of 1.0 MGD. No toxicity testing is required at the current 0.325 MGD flow.
Please find enclosed the revised pages, which should be inserted into your permit. The old pages 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 Adriumstrative 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.
Sincerely,
6v el:got-
cc:
ryJ. Thorpe, Ph.D.
Central Files
Raleigh Regional Office, Water Quality Section
Point Source Compliance Enforcement Unit
NPDES Unit
Aquauc Toxicology Unit
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer VISIT us ON THE INTERNET @ http //h2o enr state nc us/NPDES

Permit NCO038831
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — 0.325 MGD
During the period beginning on the effective date of the permit and lasting until expansion above 0.325
MGD, the Permittee is authorized to discharge from outfall 001. Such discharges shall be limited and monitored by
the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample Locationl
Flow
0 325 MGD
Continuous
Recording
Influent or Effluent
BOD, 5 day (20°C)
(April 1 — October 31)
5 0 mg/L
7 5 mg/L
Weekly
Composite
Effluent
BOD, 5 day (20°C)
November 1 — March 31
10 0 mg/L
15 0 mg/L
Weekly
Composite
Effluent
Total Suspended Residue
30 0 mg/L
45 0 mg/L
Weekly
Composite
Effluent
NH3 as N
(April 1 — October 31
2 0 mg/L
Weekly
Composite
Effluent
NH3 as N
November 1 — March 31
4 0 mg/L
Weekly
Composite
Effluent
Dissolved Oxygen2
Weekly
Grab
Effluent,
Upstream & Downstream
Fecal Coliform
(geometric mean
200/100 ml
400/100 ml
Weekly
Grab
Effluent,
Upstream & Downstream
Total Residual Chlorine
2/Week
Grab
Effluent
Total Nitrogen
NO2+NO3+TKN
Quarterly
Composite
Effluent
Total Phosphorus
Quarterly
Composite
Effluent
Temperature (°C)
Daily
Grab
Effluent
Temperature (°C)
Weekly
Grab
Upstream & Downstream
pH3
Weekly
Grab
Effluent
Footnotes -
1 Upstream = at least 100 feet upstream from the outfall. Downstream = at NCSR 1222
2 The daily average dissolved oxygen effluent concentration shall not be less than 5 0 mg/L.
3 The pH shall not be less than 6 0 standard units nor greater than 9 0 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts

'Permit NCO038831
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS —1.0 MGD
During the period beginning after expansion above 1.0 MGD 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
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency
Sample Type
Sample Locationl
Flow
10 MGD
Continuous
Recording
Influent or Effluent
BOD, 5 day (20°C)
(April 1 — October 31
5 0 mg/L
7 5 mg/L
3/Week
Composite
Effluent
BOD, 5 day (20°C)
November 1 — March 31
10 0 mg/L
15 0 mg/L
3/Week
Composite
Effluent
Total Suspended Residue
30 0 mg/L
45 0 mg/L
3/Week
Composite
Influent & Effluent
NH3 as N
(April 1 — October 31
2 0 mg/L
3/Week
Composite
Effluent
NH3 as N
November 1 — March 31
4 0 mg/L
3/Week
Composite
Effluent
Dissolved Oxygen2
3/Week
Grab
Effluent
Upstream & Downstream
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
3/Week
Grab
Effluent
Upstream & Downstream
Total Residual Chlorine
22 0 pg/L
3/Week
Grab
Effluent
Total Nitrogen
NO2+NO3+TKN)
Monthly
Composite
Effluent
Total Phosphorus
Monthly
Composite
Effluent
Temperature (°C)
Daily
Grab
Effluent
Temperature (°C)
1
Grab
Upstream & Downstream
pH3
3Meek
Grab
Effluent
Chronic Toxicity4
Quarterly
Composite
Effluent
Footnotes -
1 Upstream = at least 100 feet upstream from the outfall Downstream = at NCSR 1222 Instream samples shall
be collected three times per week during June, July, August, and September and once per week during the
remaining months of the year.
2. The daily average dissolved oxygen effluent concentration shall not be less than 5 0 mg/L
3. The pH shall not be less than 6 0 standard units nor greater than 9 0 standard units
4. Chronic Toxicity (Ceriodaphnia, Pass/Fail @ 76%) January, April, July & October (see Parr A. (3 ))
There shall be no discharge of floating solids or visible foam in other than trace amounts

Permit NC0038831
A. (3.) CHRONIC TOXICITY PASS/FAIL PERMIT LIMIT (Quarterly)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to
Ceriodaphnia dubia at an effluent concentration of 76 Yo.
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or
"North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent
versions. The tests will be performed during the months of January, April, July and October. Effluent sampling
for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit,
then multiple -concentration testing shall be performed at a minimum, in each of the two following months as
described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or
subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest
concentration having no detectable impairment of reproduction or survival and the lowest concentration that does
have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection
methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic
Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge
Monitoring Form (MR -1) for the months in which tests were performed, using the parameter code TGP3B for the
pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT -3 (original) is to be sent to the
following address:
Attention: NC DENR / DWQ / Environmental Sciences Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 30
days after the end of the reporting period for which the report is made.
Test data shall be complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature.
Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for
disinfection of the waste stream. '
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the
permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility
name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the
comment area of the form. The report shall be submitted to the Environmental Sciences Branch at the address cited
above.
Should the pernuttee fail to monitor during a month in which toxicity monitoring is required, monitoring will be
required during the following month. Show -d any test data from this monitoring requirement or tests performed by
the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be
re -opened and modified to include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid
test and will require immediate follow-up testing to be completed no later than the last day of the month following
the month of the initial monitoring.