NC0069841_Technical Correction_20091015

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0069841
Crooked Creek WWTP
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:
October 15, 2009
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A7rA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
October 15, 2010
Mr. Mark Tye
Union County Public Works
500 North Main Street, Suite 500
Monroe, NC 28112
Subject: Permit Correction for Crooked Creek WWTP #2
NPDES Permit NC0069841
Union County
Dear Mr. Tye:
Division personnel have reviewed and corrected the effluent limitations and monitoring requirements of
your existing NPDES Permit to address an error. The permit correction is cited below:
> The sample type for tetrachloroethylene on the Effluent Limitations and Monitoring Requirements
under Section A.(1.) has been changed from composite to grab. Since TCE is a volatile, the sample
type should be a grab sample.
We are forwarding you the new Section A. (1.) Effluent Limitations and Monitoring Requirements page.
You should replace your existing Effluent Limitations and Monitoring Requirements sheet with this revised page.
This permit correction 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).
If any parts, measurement frequencies or sampling requirements contained in this permit correction 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 in the form of a written petition, conforming to Chapter
150B of the North Carolina General Statutes, and 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.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-877-623-6748
Internet www.ncwaterqualq.org
An Equal Opportunity 1 Affirmative Action Employer
Noe Carolina
• �tura!!y

Please note that this permit is not transferable except after notice to the Division. The Division may
require modification or revocation and reissuance of the permit. This permit does not affect the legal
requirements to obtain other permits which may be required by the Division of Water Quality or permits required
by the Division of Land Resources, the Coastal Area Management Act or any other Federal or Local
governmental permit that may be required.
If you have any questions concerning this permit, please contact Julie Grzyb at telephone number [phone].
Sincerely,
een H. ullins
Enclosure NC0069841 Modified page
cc: NPDES Unit
Central Files
Mooresville Regional Office/Surface Water Protection
e-copy:
Aquatic Toxicology
ESS, Carrie Ruhlman
EPA Region IV
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service:1-877-6i23-6748
Internet: www.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer
NorthCarolina
;Vaturattj

Permit NC0069841
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
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
•
LIMITS
MONITORING REQUIREMENTS
EFFLUENT
CHARACTERISTICS
Monthly'
Average
Weekly ,
Average
Daily
Average
Measlxrement
Frequency
Sample
Type
' Sample
Location1
Flow
1.9 MGD
Continuous
Recording
I or E
BOD, 5-day, 20 °C2
(April 1- October 31)
5.0 mg/1
7.5 mg/1
3/Week
Composite
I,E
BOD, 5-day, 20 °C2
(November 1- March 31)
10.0 mg/1
15.0 mg/1
3/Week
Composite
I,E
Total Suspended Solids2
30.0 mg/1
45.0 mg/1
3/Week
Composite
I,E
NH3-N
(April 1- October 31)
2.0 mg/1
6.0 mg/L
3/Week
Composite
E
I-N
(November 1- March 31)
.4.0 mg/1
12.0 mg/L
3/Week
Composite
E
Total Residual Chlorine3
17 µg/L
28.0 µg/L
3/Week
Grab
E
Total Nitrogen
(NO2 + NO3 + TKN)
Monthly
Composite
E
Total Phosphorus
Monthly
Composite
E
Total Copper
Monthly
Composite
E
Total Zinc
Monthly
Composite
E
Tetrachloroethylene4
18.0 g L
Monthly
Grab
E
Chronic Toxicity5
Quarterly
Composite
E
Effluent Pollutant Scan6
Annually
Composite
E
pH
Between 6.0 to 9.0 standard units
3/Week
Grab
E
Dissolved Oxygen
3/Week
Grab
E,U, D
Fecal Coliform (ge°mebic "1ea")
200/100 ml
400/100 ml
3/Week
Grab
E,U, D
Temperature
Daily
Grab
E, U,D
Conductivity
3/Week
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. TRC limit and monitoring requirement only apply if chlorine is used for disinfection.
4. The tetrachloroethylene limit will take effect 18 months after the permit becomes effective. If 12 months of samples are below
the detection limit, the facility may request to have the limit and monitoring requirements removed from the permit.
5. Chronic Toxicity (Ceriodaphnia) P/F at 90%: February, May, August, and November (see Section A. (2.)).
6. Effluent Pollutant Scan annually for all parameters listed in Section A. (3.).
7. The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/ I.
There shall be no discharge of floating solids or foam visible 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, auarterlq 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, and 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. If reporting pass/fail results using the parameter code
TGP3B, DWQ Form AT-1 (original) is sent to the below address. If reporting Chronic Value results using the
parameter code THP3B, DWQ Form AT-3 (original) is to be sent to the following address:
Attention: NC DENR / Division of Water Quality
Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section 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 Section 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.
If the Permittee monitors any pollutant more frequently then required by this permit, the results of such monitoring
shall be included in the calculation and reporting of the data submitted on the DMR and all AT Forms submitted.
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.

.0
Grzyb, Julie
From: Grzyb, Julie
Sent: Thursday, September 23, 2010 4:04 PM
To: Bell, Wes
Subject: RE: Union County/Crooked Creek #2 WWTP
Wes,
You are correct - my mistake, I'll have to issue a corrected effluent sheet. I can do it next week.
Thanks for catching that.
Julie
From: Bell, Wes
Sent: Thursday, September 23, 2010 3:50 PM
To: Grzyb, Julie
Subject: Union County/Crooked Creek #2 WWTP
Hello Julie, hope everything is going good. Quick question, I reviewed the Union County/Crooked Creek NPDES Permit
(NC0069841) and found that tetrachloroethylene is to be collected as a composite sample. Since TCE is a volatile, would
it be a grab sample instead? Thanks for your time.
Wes
Wes Bell - [e-mail]
North Carolina Dept. of Environment & Natural Resources
Div. of Water Quality
610 E. Center Ave., Suite 301
Mooresville, NC 28115
Ph: 704.663.1699 Fax: [phone]
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
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