NC0084387_technical Correction_20150427

NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
Mr. John C. Huber, Chef of Operations
Charlotte Water
7980 Babe Stillwell Farm Rd
Huntersville, NC 28078
Dear Mr. Huber:
Donald R. van der Vaart
Secretary
April 27, 2015
Subject: Change -Page to Correct Error
NPDES Permit NCO084387
Lee S. Dukes, Jr. Water Treatment Plant (WTP)
Mecklenburg County
The Division of Water Resources (the Division) became aware of an error in your recently issued permit (March
16, 2015). Total Iron monitoring was inadvertently left in the effluent limits and monitoring page (Condition
A.I:). The parameter was removed because there was not a reasonable potential to exceed the allowable
concentration.
Accordingly, we hereby forward the modified permit pages to amend your permit removing monitoring for Total
Iron as was indicated in March 16, 2015 the cover letter. Please insert these change pages into your existing permit
and discard the old pages. We regret any inconvenience this causes your organization.
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 Resources or any other Federal, State, or
Local governmental permits that may be required.
If you have questions, or if we can be of further service, please contact Derek Denard at
[[e-mail]] or call [phone].
spec Ily� ,
rn
Jay Zimmerman, Due
Division of Water Resources, NCDENR
Enclosure: NPDES Permit NC0007552 (Corrected Pages)
he: Central Files
NPDES Program Files
MRO Files/ Alin: Michael Parker
ec: Aquatic Toxicology Unit, Susan Meadows [[e-mail]]
Jack Jarrell [[e-mail]]
Randy Hawkins [[e-mail]]
Gabe Sasser [[e-mail]]
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Phone: [phone] k Internet: www.ncwaterquality.org
An Equal Opportunity1 Afirmative Action Employer —Made In part by recycled paper

�- NPDES Permit NC00
PART I
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 02B .0400 et seq., 02B .0500 seq.]
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge filter backwash via Outfa11001.. Such discharges shall be limited
and monitored by the Permittee as specified below:
_�QiG
12E _ME
:
U�T_.-.-77
..
77 -77
G'4D%
IYlo�gthly
Daily
lxeasuir�eime t
Sampi_e
y r
�Sairiple
Average
Maximum
Frequency;
ape'
X°ocao
_
Flow (MGD)
50050
Continuous
Recording
Effluent
Total Suspended Solids (mg/L)
C0530
30.0 mg/L
45.0 mg/L
Weekly
Grab
Effluent
pH (su)
00400
Not < 6.0 or > 9.0
standard units
Weekly
Grab
Effluent
Total Residual Chlorine 2 (µg/L)
50060
28 µg/L 2
Weekly
Grab
Effluent
Turbidity (NTU)
00070
Weekly
Grab
Effluent
Total Aluminum 3 (µg/L)
01105
Quarterly
Grab
Effluent
Total Fluoride 3 (µg/L)
00951
Quarterly
Grab
Effluent
Total Phosphorous (TP) (mg/L)
C0665
Quarterly
Grab
Effluent
TKN 4 (mom)
NO3-N
00625
Quarterly
Grab
Effluent
+ NO2 N (mg/L)
00630
Quarterly
Grab
Effluent
TN 4 (MA)
C0600
Quarterly
Grab
Effluent
Chronic WET Testing 5
TGP3B
--]—Quarterly
j
Grab
Effluent
Footnotes:
1. No later than 270 days from the effective date of this permit, begin submitting discharge monitoring
reports electronically using NC DWR's eDMR application system. See Special Condition A. (3.).
2. The Division shall consider TRC effluent values reported below 50 µg/L to be compliant with the
permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina -certified laboratory method (including field certified), even if these values fall below 50µg/L.
3. Samples shall be collected concurrently with WET -test samples.
4. For a given wastewater sample, TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total
Kjeldahl Nitrogen, and NO3-N and NO2 N are Nitrate and Nitrite Nitrogen, respectively
5. Whole Effluent Toxicity (WET) testing - testing of Ceriodaphnia dubia shall be performed as 7-day pass/fail
test at 37% effluent concentration, during January, April, July and October [See A. (2)].
Comments:
Samples shall be taken at the outfall but prior to mixing with the receiving waters.
There shall be no discharge of floating solids or foam in other than trace amounts.
Page 3 of 6

NPDES Permit NCO084387
A. (2.) CHRONIC TOXICITY PASS/FAIL MONITORING (QUARTERLY)
[15A NCAC 02B .0500 et seq.]
The permittee shall conduct quarterl chronic toxicity tests using test procedures outlined in the "North
Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent
versions.
The effluent concentration defined as treatment two in the procedure document is 37%. The testing shall
be performed as a Ceriodaphnia dubia 7-day pass/fail test. The tests will be performed during the
months_ of January, April, July and October. These months signify the first month of each three
month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be
obtained during representative effluent discharge and shall be performed at the NPDES permitted final
effluent discharge below all treatment processes.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the month in which it was performed, using the parameter code
TGP3B. Additionally, DWR Form AT-1 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Water 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 and accurate and include all supporting chemical/physical measurements
performed in association with the toxicity tests, as well as all dose/response data. 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
Water Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required, then
monthly monitoring will begin immediately. Upon submission of a valid test, this monthly test
requirement will revert to quarterly in the months specified above.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division
of Water Resources indicate potential impacts to the receiving stream, this permit may be re -opened and
modified to include alternate monitoring requirements or limits.
Page 4 of 6