NC0027103_NPDES Permit Mod_20140327

ATA
NCDENR
North Carolina Department of Environment and Natural Resources
Pat McCrory
Governor
March 27, 2014
Mr. Oryan D. Lowry, Town Manager
Town of Pembroke
P. O. Box 866
Pembroke, NC 28372
Subject: NPDES Permit Modification
Permit Number NC0027103
Town of Pembroke WWTP
Robeson County
Dear Mr. Lowry:
John E. Skvarla, III
DENR -W t
APR 21 2014
!WO
Division personnel have reviewed and approved your application for minor modification of the subject
permit. Accordingly we are forwarding the attached modified permit page. Please remove the existing
"Effluent Limitations and Monitoring Requirements" page and replace it with the one attached to this
letter.
This modification reduces the effluent monitoring frequencies for Biochemical Oxygen Demand
(BOD5), Total Suspended Solids (TSS), Ammonia Nitrogen (NH3-N) and Fecal Coliform from 3/week
to 2/week monitoring. The modification was based upon an evaluation of three years of facility effluent
monitoring data. The facility's performance satisfies the criteria established in the "DWQ Guidance
. Regarding the Reduction of Monitoring Frequencies in NPDES Permits for Exceptionally Performing
Facilities" as approved by the Director of the Division of Water Resources on October 22, 2012, and
justifies reduced monitoring for these parameters. The modified monitoring frequencies will become
effective on April 1, 2014.
This modification 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).
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
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.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Phone: [phone] Internet: www.ncwaterquality.org
• An Equal Opportunity \Affirmative Action Employer

Mr. Oryan D. Lowry
NC0027103 Monitoring Frequency Reduction 2014
p. 2
If you:have any questions concerning this permit, please contact Bob Sledge at telephone number (919)
807-6398 or via'e=mail at [e-mail].
omas A. Reeder
attachment
cc: Central Files
Fayette lIER- gioriaLOffice DWR/Water-Quahtyy�
NPDES Permit File -
ec: EPA Region 4 — Mark Nuhfer

Permit NC0027103
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning April 1, 2014 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
CiMITS :
• MONITORING.'REQUlREMENTS
' Monthly
. Average .:
` .Weekly
Average.
Daily " :.
. Mazimu'm ..
Measurement ';
. . Frequency.. •..
ample Type..
S...
Sample Location ,
Flow
1.33 MGD
Continuous
Recording
Influent or
Effluent
Temperature, °C
Daily
Grab
Effluent
Temperature, °C
(June 1 - September 30)
3/Week
Grab
Upstream a
Downstream 1
Temperature, °C
(October 1 - May 31)
Weekl y
Grab
Upstream Et
Downstream 1
BOD, 5-day, 20° C 2
18.0 mg/L
27.0 mg/L
2/Week
Composite
Influent >
Effluent
Total Suspended Solids (TSS) 2
20.0 mg/L
30.0 mg/L
2/Week
Composite
Influent Effluent
Ammonia as Nitrogen (NH3-N)
12.0 mg/L
35.0 mg/L
2/Week
Composite
Effluent
Dissolved Oxygen (DO)
Not less than 5.0 mg/L daily average
3/Week
Grab
Effluent
Dissolved Oxygen, mg/L (DO)
(June 1 - September 30)
3/Week
Grab
Upstream Ft
Downstream 1
Dissolved Oxygen, mg/L (DO)
(October 1 - May 31)
Weekly
Grab
Upstream a
Downstream 1
Fecal Coliform
(Geometric mean)
200/100 ml
400/100m1
2/Week
Grab
Effluent
pH
Not more than 9.0 S.U. nor less than
6.0 S.U.
3/Week
Grab
Effluent
Total Residual Chlorine 3
28 pg/L
3/Week
Grab
Effluent
Total Kjeldahl Nitrogen (TKN)
Monitor and Report, mg/L
Monthly
Composite
Effluent
Nitrite/Nitrate Nitrogen
(NOz-N + NO3-N)
Monitor and Report, mg/L
Monthly
Composite
Effluent
Total Nitrogen (TN)
TN = (NO2-N + NO3-N) + TKN
Monitor and Report, mg/L
Monthly
Calculated
Effluent
Total Phosphorus (TP)
Monitor and Report mg/L
Monthly
Composite
Effluent
Cadmium, pg/L 4
Monthly
Grab
Effluent
Chronic Toxicity 5
Quarterly
Composite
Effluent
Pollutant Analysis 6
Annually
Composite
Effluent
Footnotes:
1. Sample locations: Upstream = CSX R.R. Trestle (above plant), Downstream = at Bridge SR 1554.
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15 percent of
the respective monthly average influent value (85% removal).
3. Total Residual Chlorine compliance is required for chlorine or chlorine derivative used for disinfection. The
Division shall consider all effluent TRC values reported below 50 ug/l to be in compliance with the permit.
However, the Permittee shall continue to record and submit all values reported by a North Carolina certified
laboratory (including field certified), even if these values fall below 50 ug/l.
4. Cadmium measurement detection minimum of 1 pg/L.
5. Chronic Toxicity (Ceriodaphnia) P/F at 1.7%; January, April, July, and October. See Special Condition A.(2.) of
this permit. Quarterly sampling shall be conducted at the same time as metal and other effluent parameters
sampling is conducted.
6. See Condition A.(3.) of this permit.
There shall be no discharge of floating solids or visible foam in other than trace amounts.