NC0086762_Permit (Modification)_20110510

NPDES DOCIMENT SCANNING COVER SHEET
NPDES Permit:
NC0086762
P. W. Swann WTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File
- Historical
Engineering Alternatives (EAA)
Staff Report
Instream Assessment (67b)
Speculative Limits
Environmental
Assessment (EA)
Permit
History
Document Date:
May 10, 2011
This document is printed on reuse paper - ignore arty
content 011 the reizerse 'side

ATA
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
May 10, 2011
David K. Saunders
City of Winston-Salem / Forsyth County Utilities
P. O. Box 2511
Winston-Salem, North Carolina 25111
Subject: Permit Correction
NPDES Permit NC0086762
Northwest WTP
Forsyth County
Dear Mr. Saunders:
Dee Freeman
Secretary
Division personnel have reviewed and corrected parts of your existing NPDES Permit to address the Monitoring
Frequency for Ammonia Nitrogen. The Monitoring Frequency indicates "2/Month" and should have read "Quarterly".
We apologize for any inconvenience this may have caused.
A new corrected Effluent page with the Monitoring Frequency for Ammonia Nitrogen noted as "Quarterly" is attached. You
should discard the Effluent page you have and replace it with this corrected Effluent 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 you have any questions concerning this permit, please contact Bob Guerra at telephone number [phone].
Sincerely,
fit_
iColeen H. Sullin
Atta: NC0086762 Corrected Effluent Page
cc: Mooresville Regional Office/Surface Water Protection
Central Files
NPDES General Permit Files
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.ncwaterquality.org
An Equal Opportunity 1 Affirmative Action Employer
One
NorthCarolina
Naturally

Set �F-Q2ac.
4 D. S
-et /OAC:
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expiration, the
Permittee is authorized to discharge filter backwash from outfall 001. Such discharges shall be
and monitored by the Permittee as specified below:
OO
limited
EFFLUENT
CHARACTERISTICS
/ LIMITS
MONITORING REQUIREMENTS
Monthly
ge
Weekly
Average
Daily
Maximum
Measurement
Frequency
Sample
Type
Sample
Location
Flow
35.0 GD
Continuous
Recording
Effluent
TSS
86 mg/L
45 mgJL
Weekly
Grab
Effluent
pH
6.0 — 9.0 s.u.
Weekly
Grab
Effluent
Total Residual
Chlorine 1,2
17 µg/L
Weekly
Grab
Effluent
Total Zinc
2/Month
Grab
Effluent
Total Copper
2/Month
Grab
Effluent
Fluoride
2/Month
Grab
Effluent
Total Phosphorus
(TP)
Monthly
Grab
Effluent
Total Nitrogen (TN)
Monthly
Grab
Effluent
Aluminum
Quarterly3
Grab
Effluent
Calcium
Quarterly3
Grab
Effluent
Magnesium
Quarterly3
Grab
Effluent
Manganese
Quarterly3
Grab
Effluent
Ammonia Nitrogen4
Quarterly3
Grab
Effluent
Total Iron
Quarterly3
Grab
Effluent
Whole Effluent
Toxicity Monitoring5
Quarterly
Grab
Effluent
Notes:
1. Limit and monitor only if the facility adds chlorine to water that is eventually discharged.
2. The Division shall consider all effluent TRC values reported below 50 ug/I 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/I.
3. Parameters should be monitored in conjunction with toxicity test.
4. Facilities using Chloramination are required to monitor ammonia nitrogen on a quarterly basis.
5. See Attachment A (3.).
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.

Guerra, Bob
From:
Sent:
To:
Cc:
Subject:
Bob,
Hennessy, John
Wednesday, April 20, 2011 10:48 AM
Guerra, Bob
Boone, Ron; Basinger, Corey; Weaver, Charles
FW: Chloramination and WS WTPs
believe this is your permit. Please modify the permit to incorporate the necessary corrections. Also, please
coordinate with the RO to ensure they are comfortable with the changes. Let me know if you have any questions.
Thanks.
From: Weaver, Charles
Sent: Friday, April 15, 2011 10:48 AM
To: Hennessy, John
Subject: FW: Chloramination and WS WTPs
Forgot to add you on the cc list
From: Weaver, Charles
Sent: Friday, April 15, 2011 10:13 AM
To: Boone, Ron; Basinger, Corey
Subject: RE: Chloramination and WS WTPs
Ron / Corey - I set the NH3 monitoring in the Swann permit to Optional.
doesn't reflect the situation at the plant, so we don't need BIMS cluttered
John — a permit correction should be issued for NC0086762, to rectify the
CHW
The confusion generated by the permit
with false violations.
problems Ron found.
From: Boone, Ron
Sent: Friday, April 15, 2011 9:45 AM
To: Weaver, Charles; Basinger, Corey
Subject: Chloramination and WS WTPs
Charles/Corey,
Happy Friday...hope you are well!
The city of WS has tt e water treatment plants (WTP), Northwest Plant, now known as Swann (NC0086762), Neilson
plant (NC0086011), and RA Thomas plant (NC0079821). All three plants are required to monitor Ammonia Nitrogen,
however one of them has a different footnote from the other two that confuses the situation and will continue to
cause monthly monitoring violations until we fix it, somehow. None of the plants have a limit, just a monitoring
requirement.
Both the RA Thomas and Neilson plants are required to monitor Ammonia Nitrogen quarterly and include the following
footnote: "Facilities using chloramination will be required to monitor ammonia nitrogen on a quarterly basis. Ammonia
nitrogen monitoring only applies if the facility chloraminates." Makes sense, just a bit redundant. And neither plant
Chloraminates so they don't have to monitor.
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However, the Swann Plant, generates a monthly monitoring violation for Ammonia Nitrogen because they're required
to monitor twice per month, but they don't because the permit's footnote says, "Facilities using Chloramination are
required to monitor Ammonia Nitrogen on a quarterly basis." Firstly, the plant doesn't use Chloramination at all and
according to my conversations with Bill Brewer, the superintendent, it most likely never will...therefore this particular
footnote does not apply at all because they don't use it. However, it is contradictory of the monitoring requirement in
the table. Also, technically they should be monitoring Ammonia Nitrogen twice per month because it says so in the
table and the footnote lacks the following exclusion "Ammonia nitrogen monitoring only applies if the facility
chloraminates", which is included in the RA Thomas and Neilson permits.
So, what now? I can BPJ them every month...doesn't bother me cause I have the common sense that BIMS doesn't. But
technically they're generating monthly violations until the permit is modified or they start monitoring Ammonia
Nitrogen twice per month.
Whatcha y'all think of that?
Thanks, Ron
Ron Boone
NC DENR Winston-Salem Regional Office
Division of Water Quality, Surface Water Protection
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
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.
From: Basinger, Corey
Sent: Thursday, April 14, 2011 2:48 PM
To: Boone, Ron
Subject: RE: Chloramination
Will definitely be something to consider upon permit renewal.
Might be able to have the limits changed in BIMS to reflect the fact that this particular parameter (Ammonia -Nitrogen)
would never be monitored since they don't currently use chloramination and don't plan to in the future.
Corey Basinger
Interim Regional Supervisor
Surface Water Protection Section
[e-mail]
NC DENR Division of Water Quality
585 Waughtown Street
Winston-Salem, NC 27107
[phone]
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.
From: Boone, Ron
Sent: Thursday, April 14, 2011 2:42 PM
2

To: Basinger, Corey
Subject: FW: Chloramination
Corey, why don't we just remove the parameter from the permit?
Ron Boone
NC DENR Winston-Salem Regional Office
Division of Water Quality, Surface Water Protection
585 Waughtown Street
Winston-Salem, NC 27107
Voice: [phone]
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.
From: William Brewer [mailto:[e-mail]]
Sent: Thursday, April 14, 2011 2:15 PM
To: Boone, Ron
Subject: Re: Chloramination
Hey Ron,
We wouldn't use chloramination. That clause was put in by Division of Water Quality as a catch all for water plants that
do chloraminate. In order for us to start chloraminating we would have to give public notice and go through a pretty
extensive public relations campaign.
Thanks,
Bill Brewer
Water Treatment Superintendent
City of Winston-Salem
2800 River Ridge Road
Pfafftown, NC 27040-8600
IR 336.945.1179 (OFFICE)
IN 336.399.5047 (MOBILE)
336.747.9224 (FAX)
billbn.citvofws.org
Please consider the environment before printing this e-mail.
»> "Boone, Ron" <[e-mail]> 4/14/2011 2:11 PM »>
Bill,
I was just going over our monthly violations report and came upon another monitoring violation for total ammonia on
your Jan 2011 DMR. Under what circumstances exactly would you use chloramination at NW WTP?
Ron
Ron Boone
NC DENR Winston-Salem Regional Office
Division of Water Quality, Surface Water Protection
585 Waughtown Street
Winston-Salem, NC 27107
3

a
Voice: [phone]
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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