NC0086690_Permit Modification_20120208

ALT,M�
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P.E. Dee Freeman
Governor Director Secretary
February 8, 2012
Mr. Thomas J. Roberts
Aqua North Carolina, Inc.
202 MacKenan Ct
Cary, N.C. 27511
Subject: Modification of NPDES Permit NC0086690
Stansted Subdivision Well #2 WTP
Wake County
Dear Mr. Roberts:
The Division has reviewed the modification request you submitted on January 27, 2012. The
Division has no objection to your request. 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).
This modified permit includes the following changes from your current permit:
➢ The Flow limit has been deleted.
➢ Monitoring for Total Iron has been reduced to Quarterly.
If any parts, measurement frequencies or sampling requirements contained in this modification 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.
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 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 matter, please contact Charles H. Weaver at (919)
807-6391 or via e-mail [charles.weaverpncdenr.gov].
S' cer y,
hazles Waluld, P.E.
cc: Central Files
Raleigh Regional Office / Surface Water Protection
NPDES Unit i
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
512 North Salisbury Street, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: www.ncwaterquality.org
An Equal Opportunity/Atrirmative Action Employer —50% Recyded/l0% Post Consumer Paper
No�rthCarolina
Naturldy

Permit NCO086690
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on February 1, 2012 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 for each outfall:
LJ11`5
IA Yrx �r
*NTR)f,G >. UFEI�lENTS
-PARAMETER
.F Y
Monthly
xy
:EPOS Code]
Fl ow
Monthly
Estimate
Effluent
[50050 ]
Total Suspended Solids (TSS)
30.0 mg/L
45.0 mg/L
2/Month
Grab
Effluent
[00310]
Total Iron (Ng/L)
Quarterly
Grab
Effluent
[01045]
Total Residual Chlorine (TRC) 2
17 Ng/L
2/Month
Grab
Effluent
[50060]
pH
> 6.0 and < 9.0 standard units
2/Month
Grab
Effluent
[00400]
— —
Nitrate/Nitrite Nitrogen
Monitor & Report (mg/L)
Semi-annually
Grab
Effluent
(NO2 - N + NO3- N) [00630]
Total Kjeldahl Nitrogen (TKN)
Monitor & Report (mg/L)
Semi-annually
Grab
Effluent
[00625]
Total Nitrogen (TN) 3
Monitor & Report (mg/L)
Semi-annually
Calculated
Effluent
[00600]
Total Phosphorus (TP)
Monitor & Report (mg/L)
Semi-annually
Grab
Effluent
[00665]
Footnotes:
1. Daily flow estimates are determined by the number and duration of backwash/rinse events.
2. Limit and monitoring requirements apply only if chlorine or a chlorine derivative is used for
disinfection. The facility shall report all effluent TRC values reported by a NC certified laboratory
including field certified. However, effluent values below 50 µg/ L will be treated as zero for
compliance purposes.
3. For a given wastewater sample, TN = (NO2-N + NO3-N) + TKN, where TN is Total Nitrogen, (NO2-N +
NO3-N) is Nitrite/ Nitrate Nitrogen, and TKN is Total Kjeldahl Nitrogen.
All samples collected should be from a representative discharge event.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

AO UA_
January 25, 2012
Mr. Tom Belnick
[e-mail]
NPDES Unit Supervisor
NCDENR
1601 Mail Service Center
Raleigh, NC 27699-1601
RE: NPDES Permit NCO086690
Stansted Subdivision Well #2 WTP
Dear Mr. Belnick,
Aqua North Carolina, Inc. Thomas J. Roberts
202 MacKenan Court President and Chief Operating Officer
Cary, NC 27511
T: 919.653.5770
F: 919.460.1788
[e-mail]
www.aq u a north ca rol i na.com
- -- - -
i-
-----
JAN 2 7 2012
In accordance with the attached Changes to Water Treatment Plant Strategy (October 2009), Aqua North
Carolina, Inc. (Aqua) requests the following permit modifications be made to NPDES Permit
NCO086690:
Remove flow limits as noted in Chances to Water Treatment Plant Strategy (October 2009), item
I. When this permit was initially issued, there were no flow limits. However, when the permit
was renewed in 2008 a flow limit of 0.0025 MGD was instituted. Due to changing raw water
quality, requiring more frequent backwash requirements, Aqua North Carolina, Inc. respectfully
requests that this flow limit be removed.
• Change the total iron monitoring requirement from monthly to quarterly monitoring requirement
as noted in Changes to Water Treatment Plant Strategy (October 2009), item III.
Thank you very much for your consideration in this matter. If you need any further information from
me, please don't hesitate to contact me.
Si r y,
Thomas J. R/COO
President an
!ms
Attachments
cc: Central Operations Supervisor
Stansted WTP File
An Aqua America Company