NC0074268_Technical Correction_20170804

ROY COOPER
Governor
Water Resources
ENVIRONMENTAL QUALITY
August 4, 2017
Ms. Stephanie Scheringer, Division Manager, Wastewater Treatment
Two Rivers Utilities
P.O. Box 1748
Gastonia, North Carolina 28053
Dear Mr. Scheringer:
MICHAEL S. REGAN
Secretary
S. JAY ZIMMERMAN
Director
Subject: Technical Correction NPDES Permit
Permit NC0074268
Crowders Creek WWTP
Gaston County
Class IV Facility
The Division of Water Resources (the Division) is correcting an error in your issued permit. The
sample type for Total Cyanide should be a grab sample, not composite. Accordingly, we hereby
forward the modified permit page to amend your permit. Please insert these change pages into
your existing permit and discard the old pages.
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 Teresa Rodriguez at
[e-mail] or 919-807-6387.
Respectfully,
trdayZimmerman, Director
ision of Water Resources, NCDEQ
41-6 (‘-ye?'
Enclosure: Corrected Effluent Page
Copies: NPDES Files
Central Files
DWR/Mooresville Regional Office / Water Quality Program
Ecopy: US EPA Region 4
DWR/Aquatic Toxicology Branch/Susan Meadows
State of North Carolina I Environmental Quality I Water Resources
1617 Mail Service Center Raleigh, North Carolina 27699-1617
919 807 6300

Permit NC0074268
PART I - MONITORING, CONTROLS, AND LIMITATIONS FOR PERMITTED DISCHARGES
A.(1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS [15A NCAC 02B
.0400 et seq., 02B .0500 et seq.]
(a.) During the period beginning on the effective date of the 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
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow
6.0 MGD
Continuous
Recording
Influent or Effluent
Total Monthly Flow
Monitor and Report
Monthly
Recorded or
Calculated
Influent or Effluent
BOD, 5-day, 20°C 2
13.0 mg/L
19.5 mg/L
2/Week
Composite
Influent & Effluent
Total Suspended Solids 2
30.0 mg/L
45.0 mg/L
2/Week
Composite
Influent & Effluent
NH3 as N
(April 1 - October 31)
2.0 mg/L
6.0 mg/L
2/Week
Composite
Effluent
NH3 as N
(November 1 — March 31)
10.0 mg/L
30.0 mg/L
2/Week
Composite
Effluent
Dissolved Oxygen
Daily average >_ 6.0 mg/L
Daily
Grab
Effluent
Fecal Coliform
(geometric mean)
200/100 mL
400/100 mL
2/Week
Grab
Effluent
Temperature
Daily
Grab
Effluent
Hardness [CaCO3 or (Ca +
Mg)] mg/L
Quarterly
Composite
Effluent
Total Cyanide (pg/I)
Quarterly
Grab
Effluent
pH
?. 6.0 and <_ 9.0 standard units
Daily
Grab
Effluent
Total Residual Chlorine3
28 pg/L
Daily
Grab
Effluent
TKN (mg/L) 6
Monitor and Report
Weekly
Composite
Effluent
NO3-N + NO2-N (mg/L) 6
Monitor and Report
Weekly
Composite
Effluent
TN 4
Monitor and Report
Weekly
Composite
Effluent
TN Load 5-6
Monitor & Report (Ib/mo)
64,251 lb/summer (eff. 4/1/17)
90,672 lb/winter (eff. 11/1/17)
Monthly
Seasonally
Seasonally
Calculated
Calculated
Calculated
Effluent
TP (mg/L) 4
1 mg/L (monthly average)
(effective through 12/31/17)
Weekly
Composite
Effluent
TP Load 5 6
Monitor & Report (Ib/mo)
18,265 Ib/yr (eff. 1/1/18)
Monthly
Annually
Calculated
Calculated
Effluent
Chronic Toxicity'
Quarterly
Composite
Effluent
Effluent Pollutant Scan 8
Monitor and Report
Footnote 8
Footnote 8
Effluent
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR application
system. See Special Condition A.(8.).
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. Facility shall report all effluent TRC values reported by a NC certified laboratory including field certified.
However, effluent values below 50 pg /L will be treated as zero for compliance purposes.
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. TP is Total
Phosphorus. See Condition A.(3.) Total Nitrogen and Total Phosphorus Limits.
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4 •- e
Permit NC0074268
5. TN or TP Load is the mass quantity of Total Nitrogen or Total Phosphorus discharged in a given period of
time. See Special Condition A.(4.), Calculation of TN or TP Loads.
6. Summer is defined as April 1- October 31; winter is defined as November 1- March 31. Annual means on a
calendar year basis, January 1- December 31.
7. Chronic Toxicity (Ceriodaphnia), P/F at 41 % with testing in March, June, September and December. See
Special Condition A.(6.).
8. See Special Condition A. (7.) Priority Pollutant Scan.
(b.) There shall be no discharge of floating solids or visible foam in other than trace amounts.
A.(2.) INSTREAM SAMPLING [15A NCAC 02B .0500 et seq.]
Instream monitoring is required for the following parameters at the locations specified:
z Parameter
Frequency .
Sagnple T ,pe
Locations -
Dissolved Oxygen
Footnote 2
Grab
U, Di, D2
Temperature
Footnote 2
Grab
U, Di, D2
Conductivity
Footnote 2
Grab
U, Di
Hardness
Quarterly
Grab
U
Footnotes:
1. U: upstream at Highway 1108 (Crawford Rd.); D1: downstream at NCSR 2424 (Thompson Road); D2:
downstream at SCSR 564 (Meek Rd).
2. Instream samples shall be grab samples taken 3/week (June -September) and 1/week (October -May).
A.(3.) TOTAL NITROGEN AND TOTAL PHOSPHORUS LIMITS [G.S. 143-215.1(b)]
(a.) Total Nitrogen (TN) allocations and load limits for NPDES dischargers in the Lake Wylie watershed
are seasonal (summer and winter) values. Summer is defined as April 1 through October 31, and
winter is defined as November 1 through March 31. Total Phosphorus (TP) allocations and load limits
are annual values and apply on a calendar year basis, January 1 through December 31.
(b.) The TN (or TP) Load limit in this Permit may be modified as the result of allowable changes in the
Permittee's allocation.
(i.) Allowable changes include those transfers resulting from the purchase, sale, trade, or lease of
allocation between the Permittee and other dischargers assigned allocation under the 1995 Lake
Wylie TMDL; regionalization (if both facilities were assigned allocation); and other transactions
approved by the Division.
(ii.) The Permittee may request a modification of the TN (or TP) Load limit in this Permit to reflect
allowable changes in its allocation.
(A) The request must include an analysis demonstrating that change in allocations and limits
does not have a reasonable potential to cause localized water quality impacts.
(B) Upon receipt of timely and proper application, the Division will propose to modify the
permit as appropriate and in accordance with state and federal program requirements.
(C) Changes in TN or TP limits become effective on the first January 1 (annual limit), the first
April 1 (summer limit), or the first November 1 (winter limit) following permit
modification. The Division must receive application no later than 180 days prior to the
requested effective date for any limit change.
(iii.) Any requests for modification should be sent to:
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