NC0069841_Technical Correction_20000508

NPDES DOCYNENT SCANNING COVER SHEET
NC0069841
Crooked Creek WWTP
NPDES Permit:
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Technical Correction
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
May 8, 2000
Thus document is printed on reuse paper - ignore any
content on the reYerse side

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
May 8, 2000
Mr. Charles P. O'Cain
Interim Public Works Director
P.O. Box 987
Monroe, North Carolina 28111-0987
AwirA
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: NPDES Permit Correction
Permit No. NC0069841
Crooked Creek WWTP #2
Union County
Dear Mr. O'Cain:
The Division issued NPDES permit number NC0069841 for the above referenced
facility on March 13, 2000. A review of the permit has revealed an error. Specifically,
chronic toxicity, the effluent limitations and monitoring requirements page incorrectly
indicates that chronic toxicity testing should be conducted in January, April, July,
October. This permit correction is intended to correct that oversight. Chronic toxicity
testing should be conducted February, May, August, November.
The attached corrected permit page should be inserted into your permit and the
old one discarded. If you have any questions or need additional information, please
contact Michael Myers, telephone number [phone], extension 508.
Sincerely,
foi
err T. Stevens
cc: Central Files
Mr. Roosevelt Childress, EPA
Mooresville Regional Office, Water Quality
NPDES Unit, Permit File
Aquatic toxicology Unit
Point Source Compliance/Enforcement Unit
1 61 7 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1 61 7; TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 10% POST -CONSUMER PAPER
VISIT US ON THE INTERNET @ http://h20.enr.State.nc.US/NPDES

Permit NC0069841
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - Final
During the period beginning on the effective date of the permit and lasting until expiration, the
Permittee is authorized to discharge treated wastewater from outfall(s) 001. Such discharges shall be
limited and monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS : "
MONITORING REQUIREMENTS
Monthly
Average :
: Weekly
Average
Daily
Average
9 .
Measurement
Fre uenc ,
. q ... Y
Sample Type
' . ,
Sample
i 1.:.:
Locatson
Row
1.9 MGD
Continuous
Recording
I or E
BOD, 5-day, 20 °C2 (Summer)3
5.0 mg/1
7.5 mg/I
3NVeek
Composite
I,E
BOD, 5-day, 20 °C2 (Winter)3
10.0 mg/I
15.0 mg/I
3/Week
Composite
I,E
Total Suspended Residue2 .
30.0 mg/1
45.0 mg/I
3/Week
Composite
1,E
NH3-N (Summer)3
2.0 mg/I
3/Week
Composite
E
NH3-N (Winter)3
4.0 mg/I
_
3/Week
Composite
E
Total Residual Chlorine
17 ug/L
28.0 ug/L
3/Week
Grab
E
Total Nitrogen
(NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
Copper
Monthly
Composite
E
Chronic Toxicity's
Quarterly
Composite
E
PHs
3NVeek
Grab
E
Dissolved 0xygens
3/Week
Grab
E,U, D
Fecal Coliform 7
200/100 ml
400/100 ml
3NVeek
Grab
E,U, D
Temperature
Daily
Grab
E, U,D
Conductivity
_
3NVeek
Grab
U,D
Footnotes:
1. Sample Location: E — Effluent, I — Influent, U — Upstream 50 feet from the outfall, D — Downstream
1/4 mile below discharge and at SR 1514. Upstream and Downstream samples shall be grab
samples. In -stream samples shall be collected three times per week during June, July , august,
and September and once per week during the rest of the calendar year. Instream monitoring is
provisionally waived in light of the permittee's participation in the Yadkin -Pee Dee River Basin
Association. Instream monitoring will be immediately reinstated should the permittee end its
participation in the Association.
2. The monthly average effluent BOD5 and Total Suspended Residue concentrations shall not exceed
15% of the respective influent value (85% removal).
3. Summer is defined as the period from April 1 through October 31, while winter is defined as
November 1 through March 31.
4. Chronic Toxicity (Ceriodaphnia) P/F at 90%: February, May, August, November (see Part I. A. (2.)).
5. The pH of the effluent shall not be less than 6.0 nor greater than 9.0 (on the standard units scale)
6. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/1.
7. Fecal Coliform shall be calculated using the geometric mean, according to the procedure detailed in
Part II. Section A, Paragraph 9b.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NC0069841
A. (2) CHRONIC TOXICITY PERMIT LIMIT (QRTRLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia
dubia at an effluent concentration of 90%.
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 February, May, August, November. 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: North Carolina Division of Water Quality
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 permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required
during the following month.
Should 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.