NC0086762_Permit (Modification)_20120127

NPDES DOCIMENT SCANNING COVER SHEET
NPDES Permit:
NC0086762
P. W. Swann WTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization
Permit Modification
to Construct (AtC)
--
Complete File - Historical
Engineering Alternatives (EAA)
Staff Report
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Permit
History
Document Date:
January 27, 2012
This document is printed on reuse paper - ignore any
content on the reYerse aside

AIM
RbENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Charles Wakild, P.E. Dee Freeman
Governor Director Secretary
January 27, 2012
William C. Brewer, Water Treatment Superintendent
City of Winston-Salem — Forsyth County Utilities
2800 River Ridge Road
Pfafflown, North Carolina 27040
Subject:
Dear Mr. Brewer:
Issuance of Permit Modification
NPDES NC0086762 — Class 2
P.W. Swann WTP
Forsyth County
The Division of Water Quality (the Division or DWQ) hereby issues the attached NPDES permit
for the subject facility. We issue this permit 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.
In addition to addressing your modification requests, the Division has addressed errors in your
current permit. We offer the following changes with justification in response to your letter request
of April 29, 2011:
1. Total Aluminum — monitoring quarterly is consistent with WTP permits statewide, and
must continue, given your use of conventional water -treatment technology. Your data do
not show reasonable potential to exceed North Carolina's standard for Human Health
(8,000 µg/L), therefore there is no permit limit at this time.
2. Total Calcium — deleted from permit - inappropriate for conventional technology.
3. Total Magnesium — deleted from permit - inappropriate for conventional technology.
4. Total Manganese — no request for change - no change to permit.
5. Total Fluoride — because this facility backwashes its filters with fluoridated finish water,
there is potential to concentrate fluoride. However, your database shows no reasonable
potential to exceed the fluoride standard. Therefore, the Division has reduced monitoring
frequency from 2/Month to Quarterly, in accord with current WTP Guidance.
6. Total Zinc — Because your backwash water contains zinc orthophosphate, there is potential
to concentrate zinc. Moreover, your database shows reasonable potential to exceed both
acute and chronic zinc standards. However, because this is a state action -level parameter,
the Division will add no limit, and monitoring has been relaxed from 2/Month to Monthly,
consistent with current WTP permitting procedures.
7. Total Copper — monitoring required, however not detected at concentrations above test
method minimum levels; reduced monitoring from 2/Month to Quarterly; no permit limit.
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
Noe Carolina
�tura!!ff

8. Total Iron — while data show reasonable potential to exceed the aquatic -life standard of
1,000µg/L, the Division does not limit action level parameters in the absence of toxicity
failure. We have therefore reduced the frequency from 2/Month to Quarterly (no limit).
9. Total Phosphorus -- monitoring is required of conventional water -treatment technology;
monitoring frequency reduced from 2/Month to Quarterly in accord with WTP Guidance.
10. Total Nitrogen —required for WTP conventional technology; monitoring frequency reduced
from 2/Month to Quarterly in accord with current WTP Guidance.
11. Chronic Toxicity — monitoring only for conventional technology; Quarterly monitoring
revised to Annually, as requested. However, if an annual test "Fails," monitoring shall
immediately revert to Quarterly for the duration of the permit.
Finally, the Division has removed your flow limit (35 MGD) as it is inconsistent with the 2009
WTP guidance. We have also updated your site map and facility description [see Supplement to
Cover Sheet], and have included effluent parameters codes for your convenience [see § A. (1.)].
If any parts, measurement frequencies, or sampling requirements contained in this permit
modification are unacceptable, you have the right to an adjudicatory hearing, upon written request
submitted within thirty (30) days after receiving this letter. Your request must take the form of a
written petition conforming to Chapter 150B of the North Carolina General Statutes, and you must
file it with the office of Administrative Hearings, 6714 Mail Service Center, Raleigh, North
Carolina 27699-6714. Unless such a demand is made, this permit shall be final and binding.
This permit is not transferable except after notifying the Division of Water Quality. The Division
may require permit modification, or revocation and re -issuance. Please note that this permit does
not affect your legal obligation to obtain other permits requiredby the Division of Water Quality,
the Division of Land Resources, the Coastal Area Management Act, or other federal or local
governments.
If you have questions, or if we can further assist you, please contact Joe Corporon at
[[e-mail]] or call [phone].
Enclosure: NPDES Permit NC0086762 (Final);
he: Central Files
WSRO, Attn: Ron Boone (SWPS)
NPDES Program Files f
ec: Aquatic Toxicology Unit, Attn: Susan Meadows
CG&L, Attn: Kim Colson
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service: 1-677-623-6748
Internet: www.ncwaterquality.ong
An Equal Opportunity \ Affirmative Action Employer
NonrthCarolina
Naturally

Permit NC0086762
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
(NPDES)
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
City of Winston-Salem —Forsyth County Utilities
is hereby authorized to discharge wastewater from a facility located at the
P.W. Swann Water Treatment Plant (WTP)
2800 River Ridge Road, Pfafftown
Forsyth County
to receiving waters designated unnamed tributary (UT) to Bashavia Creek within the Yadkin -Pee Dee
River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set
forth in Parts I, II, III, and IV hereof.
The permit modification shall become effective on March 1, 2012.
This permit and the authorization to discharge shall expire at midnight on January 31, 2014.
Signed this day January 27, 2012.
Ch • - akild, P. E., Director
Di on of Water Quality
By Authority of the Environmental Management Commission

Permit NC0086762
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked, and as of this issuance, any previously issued permit bearing this number is no longer effective.
Therefore, the exclusive authority to operate and discharge from this facility arises under the permit
conditions, requirements, terms, and provisions described herein.
City of Winston-Salem —Forsyth County Utilities
is hereby authorized to:
1. continue to operate a wastewater treatment system employing Conventional water -treatment
technology in support of the production of potable water, utilizing:
• one (1) equalization basin [0.489 MG w/ flow meter to residuals lagoons]
• one (1) tank [150-gallon for sodium bisulfite]
• two (2) metering pumps [for sodium bisulfite]
• two (2) residuals lagoons [each 4.3 MG]
• one (1) flume flow meter [final discharge]
o Chemicals - Potable Water Treatment
• aluminum sulfate [flocculation]
■ sodium hypochlorite [disinfection]
• sodium hydroxide [pH adjustment]
■ zinc orthophosphate [corrosion inhibition; added prior to
filter backwashing]
• hexafluorosilicic acid [fluoridation; added prior to filter
backwashing]
o Chemicals - Wastewater Treatment
• sodium bisulfite [dechlorination]
at facilities located at the P.W. Swann WTP, 2800 River Ridge Road, Forsyth County; and
2. discharge from said treatment works, at the location specified on the attached map, to a UT to
Bashavia Creek [stream segment 12-81], a waterbody currently classified C within Subbasin
03-07-02 of the Yadkin -Pee Dee River Basin.

Latitude:
Longitude:
Drainage Basin:
Receiving Stream:
Outfall 001
(flows southwest)
City of Winston-Salem — Forsyth Co. Utilities
P.W. Swann WTP
USGS Quad/State Grid: Vienna,NC/C17NW Stream Class: C
Sub -Basin: 03-07-02
HUC: 03040101
N36°08'40"
W 80° 25' 18"
Yadkin Pee -Pee River Basin
UT to Bashavia Creek [stream segment 12-81]
North
•
NPDES Permit NC0086762
Forsyth County

Permit NC0086762
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
For the period beginning on the effective date and lasting until permit expiration, or until relocation of Outfall
001 to the Yeopim River, the Permittee is authorized to discharge treated wastewater from Outfall 001 into a UT
to Bashavia Creek. Such discharges shall be limited and monitored by the Permittee as specified below:
'IBC•
.. ._ pem t °L mits �.
..� S Monitoring Requirements
■/'AeEFF%UD1T
CH R aOTERISTICS
•[Parameter; Codes]
Monthly
,Average'
4i 1
' Whek7y
Average'
14 4 .
°' Daily
Maximum
is i.•
Measurement
°Frequency '
;. 'S.0 '
Sample
• . 2Typer.�'
j . l i
Sample
. `Locatioin
Flow (MGD)
50050
Continuous
Recording
Effluent
Total Suspended Solids
C0530
30 mg/L
45 Mg/L
Weekly
Grab
Effluent
TRC 1
50060
17 µg/L 1
Weekly
Grab
Effluent
pH
00400
Not < 6.0 nor > 9.0 standard units
Weekly
Grab
Effluent
Total Zinc
01092
Monthly
Grab
Effluent
Total Iron
01045
Quarterly 2
Grab
Effluent
Total Aluminum
01105
Quarterly 2
Grab
Effluent
Total Copper
01042
Quarterly 2
Grab
Effluent
Total Manganese
01055
Quarterly 2
Grab
Effluent
Total Fluoride
00951
Quarterly 2
Grab
Effluent
Total Nitrogen (TN)
C0600
Quarterly
Grab
Effluent
Ammonia Nitrogen 3
C0610
Quarterly
Grab
Effluent
Total Phosphorus (TP)
C0665
Quarterly
Grab
Effluent
WET Testing 4
TGP3B
Annually
Grab
Effluent
Footnotes:
1) TRC (Total Residual Chlorine) monitor only if chlorine is used to disinfect. All TRC
concentrations reported below 50 µg/L by a NC -Certified test method (including field -certified),
shall be considered compliant with this permit. However, the Permittee shall submit all lab -
reported concentrations, even if detected below 50µg/L.
2) To be sampled concurrently with WET testing.
3) Ammonia nitrogen monitoring is required only if chloramination is used to disinfect.
4) WET (Whole Effluent Toxicity) Testing; CHRONIC, monitoring only - Annually using species
Ceriodaphnia dubia; effluent @ 90 % concentration [See § A. (2.)]. If any WET test fails, the
monitoring frequency shall revert immediately to Quarterly for the duration of the permit, during
the months of February, May, August, and November.
Conditions:
• The Permittee shall discharge no floating solids or foam.

Permit NC0086762
A. (2.) CHRONIC TOXICITY MONITORING -- ANNUALLY
The Permittee shall conduct quarterly chronic toxicity tests using test procedures outlined in the "North Carolina
Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions.
The effluent concentration defined as treatment two in the procedure document is 90%. The permit holder
shall perform quarterly monitoring using this procedure to establish compliance with the permit condition.
Tests will be performed Annually. If any WET test fails, the monitoring frequency shall revert immediately
to Quarterly for the duration of the permit, during the months of February, May, August, and November.
Effluent sampling for this testing shall be performed at the NPDES-permitted final effluent discharged 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, DWQ Form AT-1 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Quality
Environmental Sciences Section
1621 Mail Service Center
Raleigh, N.C. 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental 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 Environmental 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 Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to
include alternate monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism
survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an
invalid test and will require immediate follow-up testing to be completed no later than the last day of the month
following the month of the initial monitoring.

Left de:
BIMS Tracking Slip
NPDES PERMIT RENEWAL
DRAFT & FI\AL
CHECK L ST
CF)tf\Niri(Ok)A,L--
FILE CONTENTS: Facility Grry6 I O oY Vt
W T
Right side:
❑ Streamline Package Sheet
CY Draft Permit Cover Letter.
1117 Draft Permit
EK Facility Map
CZ/ Fact Sheet
E9' Permit Writer's Notes
❑ Staff Report from Region
Old Permit
111-1 Permit Application.
Acknowledgement Letter
❑ Permittee Responses
El Waste Load Allocation
Permit No. y
NPDES Permit Writer:
Joe R. Cjbrporotj
(to region, only if streamlined)
(add new policy text; summarize major changes to perrflit)
(order: cover, supplement, map, effluent sheets, special conditions)
(E-Map: include facility Outfalls; U and D sample locations)
(documents permit writer's issues and re -issue logic)
(if not in Facts Sheet -- chronology, strategy, DMR Review, RPA, etc.)
(as appropriate -- not needed if streamlined)
(Text, Effluent Sheets and Special Conditions)
(New Permit or Renewal; any additional permittee correspondence)
(NPDES Unit written response to Renewal Application)
(to acknowledgement letter, if any)
(reference date; notes if recalculated for current action)
Note: Italics inate special not always required or applicable.
Submitted to 'Z9 ((=A S
t1 Peer Review completed by
❑ Updated Public Notice System [date]
UV Submitted for Public Notice on
for Peer Review: Date ID kiV
Admin cutoff date V47
'IJSZ Date v -E N\O\b-b[.
Updated BIMS Events: [date] A?AlbJ
. ewspap e Received . Actual Notice date(s)
arrDraft Permit [Mailed / -Maile o (Regional Staff)
❑ Regional Office Reviewed /Approved by
EH] j0st'W Ni Eti hbt l: S:
VAdditional Review by
by - Date N0+o t
. Received on [Date]
initiated by Date
❑ Additional Review/Approval by Date
❑ EPA Review - Draft sent to
❑ EPA Reviewed /Approved [mail / E-mail] by
3 FINAL to
initiated by
Jeff / Mike / Matt / for signature on [date]
❑ Additional Review [other]
Date
Date Received
Letter Dated
rZ
IB' Final Files transferred to Server (Permits Folder) .)BIMS Final Updates: Events Limits
❑ Emailed FINAL to Kim Colson (CG&L) [Date]
Version 25May2011

Winston-Salem Journal
Advertising Affidavit
Account Number
Winston-Salem Journal
P.O Box 3159
Winston-Salem, NC 27102
NCDENR/DWQ/POINT SOURCE BRANCH
ATTN: DINA SPRINKLE
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
3376309
Date
December 13, 2011
Date
Category
Description
Ad Size
Total Cost
12/13/2011
Legal Notices
PUBLIC NOTICE
North Carolina Environmental
Management Commission/NPDES Unit
1617 Mail Service Center
Raleigh, NC 27699-1617
Notice of Intent to Issue a
NPDES Wastewater Permit
The North Carolina Environmental Management
Commission proposes to issue a NPDES wastewa-
ter discharge permit to the person(s) listed below.
Written comments regarding the proposed permit
will be accepted until 30 days after the publish
date of this notice. The Director of the NC•Division
of Water Quality (DWQ) may hold a public hearing
should there be a significant degree of public in-
terest. Please mall comments and/or information
requests to DWQ at the above address. .Interested
persons may visit the DWQ at 512 N. Salisbury
Street, Raleigh, NC to review information on file.
Additional information on NPDES permits and this
notice may be found on our website: http://portal
ncdenr.org/web/wq/swp/ps/npdes/calendar, or
by calling [phone].
Stokes County Schools requested renewal of per-
mit NC0087980/Pine Hall Elementary School
WWTP. Facility discharges to Eurins Creek/ Roa-
noke River Basin. Currently, fecal coliform is wa-
ter quality limited.
Stokes County Schools requested renewal of per-
mit NC0044962/North Stokes High School WWTP.
Facility discharges treated wastewater to an un-
named tributary to the Dan River/Roanoke River
Basin. Currently, total residual chlorine and fecal
coliform are water quality limited.
Stokes County Schools requested renewal of
NPDES perrnit NC0044954/South Stokes High
School WWTP. Facility discharges to Little Neat -
man Creek/Roanoke River Basin. Currently, fecal
coliform and total residual chlorine are water
quality limited.
City of Winston-Salem, Forsyth County,has ap-
plied to renew permit NC0086762 for PSwain
WTP, Riper Ridge Road, discharging filter -back-
wash to UT Bashavia Creek, Yadkin River Basin.
Carolina Water Service, Inc. NC requested renewal
of permit NC0060461 for Abington Subdivision
WWTP in Forsyth County; this permitted discharge
is treated domestic wastewater to Belews Creek,
Roanoke River Basin.
Horizons Residential Care Center applied for re-
newal of NPDES permit NC0056791 for the Hori-
zons Residential Care Center WWTP in Forsyth
County; this permitted discharge is treated do-
mestic wastewater to Buffalo Creek in the Roa-
noke River Basin.
Allegiance Healthcare Investors, LLC requested re-
newal of permit NC0037311/Creekside Manor Rest
Home/Forsyth County. Facility discharges to an
unnamed tributary. to Belews Creek/Roanoke
River Basin. Currently dissolved oxygen, ammonia
nitrogen, fecal 'coliform and total residual chlorine
are water quality limited.
PUBLIC NOTICE North Carolina Environmental Managem
1 x 75 L
543.00
Media General Operations, Inc.
Publisher of the
Winston-Salem Journal
Forsyth County
Before the undersigned, a Notary Public of Forsyth County, North Carolina, duly
commissioned, qualified, and authorized by law to administer oaths, personally appeared S.
A. Bragman, who by being duly swom deposes and says: that she is the Assistant Controller
of the Winston-Salem Journal, engaged in the publishing of a newspaper known as
Winston-Salem Journal, published, issued and entered as second class mail in the City of
Winston-Salem, in said County and State: that she is authorized to make this affidavit and
sworn statement: that the notice or other legal advertisement, a true copy of which is
attached hereto, was published in the Winston-Salem Journal on the following dates:
12/13/2011
and that the said newspaper in which such notice, paper document, oriegal advertisement
was published was, at the time of each and every such publication, a newspaper meeting all
the requirements and qualifications of Section 1-597 of the General Statutes of North
Carolina and was a qualified newspaper within the meaning of Section 1-597 of the General
Statutes of North Carolina.
This l3th day of December, 2011
(signature of son making affidavit)
Sworn to and subscribed before me, this l3th day of December, 2011
My Commission expiresS . Z 201 C
i
KIMALEY JOHNSON
NOTARY PUBLIC
FORSYTH COUNTY
STATE OF NORTH CARQLI
MY COMMISSION EXPIREG"r-Zr1
THIS IS NOT A BILL.
PLEASE PAY FROM INVOICE.
THANK YOU

DENR/DWQ/NMPDES
FACT SHEET
PERMIT MODICATION AT PERMITTEE'S REQUEST
NC0086762
Facility Information
Applicant/Facility Name:
City of Winston-Salem - Forsyth County Utilities
P.W. Swann Water Treatment Plant (WTP)
Applicant Address:
P.O. Box 2511, Winston-Salem, NC 27102
Facility Address:
2800 River Ridge Road
Permitted Flow
Not limited [removed previous error - 35 MGD]
Type of Waste:
100% Industrial (potable water production & treatment)
Conventional water -treatment technology
Facility Class/Permit Status:
Class 2 / Modification (requested 29Apr2011)
County:
Forsyth
Miscellaneous
Receiving Stream:
UT to Bashavia Creek
Regional Office:
Winston-Salem
Stream Classification:
C
State Grid / USGS Quad:
C17NW/Vienna
303(d) Listed?
No
Permit Writer:
Joe R. Corpor.;
Subbasin:
03-07-02
Date:
31 Oct2.'.0-
Drainage Area (mi2):
a
^;: • ""
a:
Lat. N 36° 08' 40" Long. W 80° 25' 18"
Summer 7Q10 (cfs)
0.0
Winter 7Q10 (cfs):
0.0
30Q2 (cfs)
0.0
Average Flow (cfs):
0.0
IWC (%):
100%
Background —
The Permittee presented a list of parameters requesting removal, and the Division applied the latest 2009 WTP
permitting Guidance for Conventional water -treatment technology and updated the permit (see permit cover
letter for changes to the previous permit and justifications).
Modifications Summary -
• Parameters of concern evaluated by reasonable potential analysis (RPA) — data and results attached
• Verified outfall location; updated facility map; revised `Bashavia Creek" to "UT of Bashavia Creek"
• Previous permits list receiving -stream flow as "not applicable" to WTP; assumed zero -flow conditions
based on outfall topographically above the receiving UT;
• Consulted with Julie Grzyb (NPDES) on WTP 2009 Strategy and aluminum standard (NC's 8,000 µg/L
vs. EPA's 87 gg/L as soluble Al standard); concluded not to limit aluminum; 360 µg/L effluent average;
• Updated permit Supplement to Cover Sheet, site map, and effluent pages;
• Submitted PDF draft to region and Permittee for review prior to issuance (01Nov2011). Received
comments on draft from Permittee and Region 04Nov2011); updated Supplement to Cover Sheet.
Fact Sheet
NPDES NC0078000
Renewal 20l I
Page 1

Forsyth County - P.W. Swann WTP
NC0086762
REASONABLE POTENTIAL ANALYSIS
Qw (MGD) = 2.37
1Q1OS (cfs) = 0.00
7Q 10S (cfs)=- 0.00
7QIOW (cfs)= 0.00
30Q2 (cfs) = 0.00
Avg. Stream Flow, QA (cfs) = 0.00
Receiving Stream: UT to Bashavia Creek
WWTP/WTP Class: 1
IWC @ 1Q10S = 100.00%
IWC @ 7Q 1OS = 100.00%
IWC @ 7Q l OW = 100.00%
IWC @ 30Q2 = 100.00%
IWC @ QA = 100.00%
Stream Class: C
Outfall 001
Qw = 2.373 MGD
CHRONIC TEST CONCENTRATION = DEFAULT %
=90%
PARAMETER
TYPE
(1)
STANDARDS & CRITERIA (2)
-a
g
N
F.
z
REASONABLE POTENTIAL RESULTS
RECOMMENDED ACTION
NC WQS /
Chronic
Applied
Standard
,
'IA FAV /
Acute
ri
# Det. Max Pred Allowable Cw
Cw
Total Copper (AL)
NC
7
FW(7Q 10s)
7
10
ug/L
59
0
5
Acute: 7.3
- _ _ _ _ _ _ _ -
Chronic: 7.0
No value > Allowable Cw
Not Detected
Not Detected
Total Fluoride
NC
1,800
FW(7Q 10s)
500
ug/L
58
58
315
Acute: NO WQS
_ ---- _ _ _
Chronic: 1,800
No value > Allowable Cw
_ _
RP = NO-------------_-_-----
Total Zinc (AL)
NC
50
FW(7Q10s)
67
10
ug/L
59
48
106
Acute: 67
_ _ _ _ _ _ _ _ _ _ _
Chronic: 50
7 value(s) > Allowable Cw
RP = YES
RP = YES
Total Iron
NC
1,000
FW(7Q10s)
20
ug/L
135
135
2,069
Acute: NO WQS
_ _ ----- _ _ __
Chronic:1,000
1 value(s) > Allowable Cw
_ _
RP =YES--------------_----.
Total Aluminum
NC
8,000
FW(7Q10s)
30
ug/L
135
135
1,451
Acute: NO WQS
- _-_-_-_- _ _-
Chronic: 8,000
No value > Allowable Cw
_______________________
RP = NO
Turbiidity
NC
50
FW(7Q10s)
ntu
116
116
13
Acute: NO WQS
_ _
Chronic: 50 ---
No value > Allowable Cw
_ RP = NO _ -----_-----------_--.
88782 RPA W-S WTP - MOD Oct2011, rpa
11/21/2011
Page 1 of 1

Freshwater RPA
y REQUIRED DATA ENTRY
Table 1. Project Information
❑ CHECK if HOW or ORW only
Facility Name
WWTP/WTP Class
NPDES Permit
Outfall
Flow, Qw (MGD)
Receiving Stream
Stream Class
7Q10s (cfs)
7Q10w (cfs)
30Q2 (cfs)
QA (cfs)
1Q10s (cfs)
Data Source(s)
❑ CHECK for MODEL
Forsyth County - P.W. Swann WTP
NC0086762
001
2.373
UT to Bashavia Creek
C
0.00
0.00
0.00
0.00
0.00
BIMS DMRs
Follow directions for data entry. In some cases a
comment menu list the available choices or a
dropdown menu will provide a list you may select
from. Error message occur if data entry does not
meet input criteria.
Table 2. Parameters of Concern
Par01
Par02
Par03
Par04
v"�' Par05
Par06
Par07
Par08
Par09
Par10
Par11
Par12
Par13
Par14
Par15
Par16
Par17
Par18
Par19
Par20
Par21
Par22
Name
Type Chronic Modifier Acute
PQL Units
Total Copper (AL)
NC
7
FW
7.3
10
ua/L
Total Fluoride
NC
1,800
FW
500
ug/L
Total Zinc (AL)
NC
50
FW
67
10
ug/L
Total Iron
NC
1000
FW
20
ug/L
Total Aluminum
NC
8000
FW
30
ug/L
Turbiidity
NC
50
FW
ntu
86762 RPA W-S WTP - MOD Oct2011, input
11/21/2011

REASONABLE POTENTIAL ANALYSIS
Total Copper (AL)
Date Data BDL=1/2DL Results
1 2009 < 10. 5 Std Dev.
2 2009 < 10. 5 Mean
3 2009 < 10. 5 C.V.
4 2009 < 10. 5 n
5 2009 < 10. 5
6 2009 < 10. 5 Mull Factor=
7 2009 < 10. 5 Max. Value
8 2009 < 10. 5 Max. Pred Cw
9 2009 < 10. 5
10 2009 < 10. 5
11 2009 < 10. 5
12 2009 < 10. 5
13 2009 < 10. 5
14 2009 < 10. 5
15 2009 < 10. 5
16 2009 < 10. 5
17 2009 < 10. 5
18 2009 < 10. 5
19 2010 < 10. 5
20 2010 < 10. 5
21 2010
22 2010
23 2010 < 10. 5
24 2010 < 10. 5
25 2010 < 10. 5
26 2010 < 10. 5
27 2010 < 10. 5
28 2010 < 10. 5
29 2010 < 10. 5
30 2010 < 10. 5
31 2010 < 10. 5
32 2010 < 10. 5
33 2010 < 10. 5
34 2010 < 10. 5
35 2010
36 2010 < 10. 5
37 2010 < 10. 5
38 2010 < 10. 5
39 2010 < 10. 5
40 2010 < 10. 5
41 2010 < 10. 5
42 2010 < 10. 5
43 2010 < 10. 5
44 2010 < 10. 5
45 2010 < 10. 5
46 2011 < 10. 5
47 2011 < 10. 5
48 2011 < 10. 5
49 2011 < 10. 5
50 2011 < 10. 5
51 2011 < 10. 5
52 2011 < 10, 5
53 2011 < 10. 5
54 2011 < 10. 5
55 2011 < 10. 5
56 2011 < 10. 5
57 2011 < 10. 5
58 2011 < 10. 5
59 2011 < 10. 5
60 2011 < 10. 5
61 2011 < 10. 5
62 2011 < 10. 5
63
64
65
66
67
68
69
70
SPECIAL, -
Values" WITH ,
' COPr _ :'
0.0
5.0
0.0
59
1.00
5.0 ug/L
5.0 ug/L
Total Fluoride
Date Data BDL=1/2DL Results
1 2009 100 100 Std Dev.
2 2009 170 170 Mean
3 2009 100 too C.V.
4 2009 130 130 n
5 2009 100 100
6 2009 100 100 Mult Factor =
7 2009 110 110 Max. Value
8 2009 100 100 Max. Pred Cw
9 2009 160 160
10 2009 100 too
11 2009 130 130
12 2009 110 110
13 2009 120 120
14 2009 150 150
15 2009 100 100
16 2009 100 100
17 2009 100 100
18 2009 120 120
19 2010 110 110
20 2010 200 200
21 2010
22 2010
23 2010 120 120
24 2010 140 140
25 2010 110 110
26 2010 140 140
27 2010 120 120
28 2010 150 150
29 2010 140 140
30 2010 130 130
31 2010 160 160
32 2010 150 150
33 2010 170 170
34 2010 120 120
35 2010
36 2010 160 160
37 2010
38 2010 200 200
39 2010 230 230
40 2010 190 190
41 2010 150 150
42 2010 170 170
43 2010 250 250
44 2010 170 170
45 2010 220 220
46 2011 190 190
47 2011 180 180
48 2011 120 120
49 2011 240 240
50 2011 210 210
51 2011 150 150
52 2011 160 166
53 2011 200 200
54 2011 190 190
55 2011 180 180
56 2011 170 170
57 2011 170 170
58 2011 190 190
59 2011 180 180
60 2011 160 160
61 2011 180 180
62 2011 200 200
63
64
65
66
67
68
69
70
Outlire / lab error?
40
153
0
58
1.26
250 ug/L
315 ug/L
-4-
86762 RPA W-S WTP - MOD Oct2011, data
11/21/2011

REASONABLE POTENTIAL ANALYSIS
Total Zinc (AL)
Date Data BDL=1/2DL
1 2009 < 23. 11.5
2 2009 < 38.
3 2009 24.
4 2009 26.
5 2009 22.
6 2009 22.
7 2009 11.
8 2009 32.
9 2009 12.
10 2009 < 10.
11 2009 14.
12 2009 < 10.
13 2009 < 10.
14 2009 18.
15 2009 17.
16 2009 18.
17 2009 20.
18 2009 48.
19 2010 53.
20 2010 53.
21 2010
22 2010
23 2010 40. 40
24 2010 56. 56
25 2010 43. 43
26 2010 41. 41
27 2010 27. 27
28 2010 20. 20
29 2010 11. 11
30 2010 18. 18
31 2010 26. 26
32 2010 20. 20
33 2010 10. 10
34 2010 22. 22
35 2010
36 2010 < 10. 5
37 2010 27. 27
38 2010 15. 15
39 2010 11. 11
40 2010 13. 13
41 2010 25. 25
42 2010 < 10. 5
43 2010 31. 31
44 2010 10. 10
45 2010 52. 52
46 2011 55. 55
47 2011 50. 50
48 2011 38. 38
49 2011 53. 53
50 2011 62. 62
51 2011 45. 45
52 2011 34. 34
53 2011 34. 34
54 2011 17. 17
55 2011 22. 22
56 2011 15. 15
57 2011 15. 15
58 2011 14. 14
59 2011 < 10. 5
60 2011 < 10. 5
61 2011 < 10. 5
62 2011 < 10. 5
63
64
65
66
67
68
69
70
19
24
26
22
22
11
32
12
5
14
5
5
18
17
18
20
48
53
53
Results
Std Dev.
Mean
C.V.
n
Mult Factor =
Max. Value
Max. Pred Cw
SPECIAL -
Values" WITH
"COPY"
Total Iron
16
24
1
59
1.71
62 ug/L
106 uglL
Date Data BDL=1/2DL Results
1 2007 324 324 Std Dev.
2 2007 332 332 Mean
3 2007 341 341 C.V.
4 2007 352 352 n
5 2007 281 281
6 2007 151 151 MuIt Factor = 1.37
7 2007 205 205 Max. Value 1510
8 2007 169 169 Max. Pred Cw 2069
Values" WI
"COPY"
COMMAN
9 2007 254 254
10 2007 248 248
11 2007 335 335
12 2007 349 349
13 2007 419 419
14 2007 323 323
15 2007 270 270
16 2007 315 315
17 2007 216 216
18 2007 586 586
19 2007
20 2007
21 2007
22 2007
23 2007
24 2007
25 2007
26 2007
27 2007
28 2007
29 2007
30 2007
31 2007
32 2007 142 142
33 2007 202 202
34 2007 83 83
35 2007 54 54
36 2007 66 66
37 2007 82 82
38 2007 83 83
39 2007 120 120
40 2007 176 176
41 2007 230 230
42 2007 266 266
43 2007 184 184
44 2007 115 115
45 2007 144 144
46 2007 124 124
47 2007 215 215
48 2007 158 158
49 2007 122 122
50 2007 303 303
51 2007 185 185
52 2007 210 210
53 2007 178 178
54 2007 133 133
55 2007 196 196
56 2007 266 266
57 2007 589 589
58 2007 280 280
59 2007 219 219
60 2007 232 232
61 2007 208 208
62 2007 190 190
63 2007 220 220
64 2007 199 199
65 2007 208 208
66 2008 138 138
67 2008 290 290
68 2008 245 245
69 2008 274 274
70 2008 216 216
178
255
1
135
-7-
86762 RPA W-S WTP - MOD Oct2011, data
11/21/2011

REASONABLE POTENTIAL ANALYSIS
71 2008 396 396
72 2008 323 323
73 2008 314 314
74 2008 260 260
75 2008 350 350
76 2008 404 404
77 2008 528 528
78 2008 682 682
79 2008 849 849
80 2008 618 618
81 2008 529 529
82 2008 405 405
83 2008 304 304
84 2008 359 359
85 2008 543 543
86 2008 260 260
87 2008 257 257
88 2008 213 213
89 2008 218 218
90 2008 246 246
91 2008 213 213
92 2008 451 451
93 2008 363 363
94 2008 289 289
95 2008 243 243
96 2008 254 254
97 2008 343 343
98 2008 186 186
99 2008
100 2008
101 2008
102 2008
103 2008
104 2008
105 2008
106 2008
107 2008
108 2008 53 53
109 2008 65 65
110 2008 199 199
111 2008 247 247
112 2008 88 88
113 2008 100 100
114 2008 99 99
115 2008 150 150
116 2008 116 116
117 2008 88 88
118 2008 63 63
119 2008 81 81
120 2008 90 90
121 2008 50 50
122 2008 52 52
123 2008 118 118
124 2008 126 126
125 2009 115 115
126 2009 90 90
127 2009 143 143
128 2009 135 135
129 2009 122 122
130 2009 152 152
131 2009 455 455
132 2009 113 113
133 2009 339 339
134 2009 162 162
135 2009 225 225
136 2009 183 183
137 2009 247 247
138 2009 291 291
139 2009 190 190
140 2009 272 272
141 2009 277 277
142 2010 239 239
143 2010 158 158
144 2010
-8-
86762 RPA W-S WTP - MOD Oct2011, data
11 /21 /2011

REASONABLE POTENTIAL ANALYSIS
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
145 2010 336 336
146 2010 343 343
147 2010 497 497
148 2010 251 251
149 2010
150 2010 180 180
151 2010 180 180
152 2011 115 115
153 2011 1510 1510
154 2011 107 107
155 2011 100 100
156 2011 614 614
157 2011 284 284
158 2011 406 406
159 2011 354 354
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
-9-
86762 RPA W-S WTP - MOD Oc12011, data
11/21/2011

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0._--S/CO”'/(11
)6Th?
Latitude = 36.144511
Longitude =-80.421702
cc t3RLt_w
Forsyth
County,
NC
Vlap Scale
1 inch =
512 feet
Disclaimer.
Forsyth
County
cannot
guarantee the
accuracy of
this
information,
and the
County
hereby
disclaims all
warranties,
including
warranties as
to the
accuracy of
this
information.
http://maps2.co.forsyth.nc.us/geodata_08/printPreview.aspx?PrintOptData=Forsyth Coun... 10/25/2011

50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow. in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow. in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
50050 - Flow, in Flow
Recorder
Recorder
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Recorder
Recorder
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
mgd
0.398
0.388
0.382
0.399
0.41
0.391
0.383
0.384
0.379
0.386
0.377
0.397
0.392
0.373
0.378
0.488
0.541
0.398
0.388
0.395
0.374
0.442
0.466
0.396
0.368
0.403
0.351
0.368
0.36
0.37
0.347
0.365
0.773
0.564
0.323
0.377
0.813
cTG.Lvi�
4
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
DLYVALUE
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
Effluent
03-07-02
03-07-02
03-07-02
03-07-02
03-07-02
03-07-02
03-07-02
03-07-02
03-07-02
03-07-02
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03-07-02
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03-07-02
03-07-02
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03-07-02
03-07-02
03-07-02
03-07-02
03-07-02
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03-07-02
03-07-02
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03-07-02
03-07-02
03-07-02
03-07-02

Corporon, Joe
From:
Sent:
To:
Cc:
Subject:
Joe,
I have discussed all of Bill's comments with him and fully agree with all of them.
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]
Boone, Ron
Thursday, November 03, 2011 7:43 AM
Corporon, Joe; Bill Brewer
Basinger, Corey
RE: NC0086762 Permit Modification - DRAFT Review of W-S / Forsyth County's Swann WTP
"D/ °-(NA(ft4-(-t7s- 6)0
-*((\c) b6Cir,
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: Corporon, Joe
Sent: Thursday, November 03, 2011 7:37 AM
To: Bill Brewer
Cc: Boone, Ron
Subject: RE: NC0086762 Permit Modification - DRAFT Review of W-S / Forsyth County's Swann WTP
Thanks for your quick response, Bill. We'll get back to you:
From: Bill Brewer [mailto:[e-mail]]
Sent: Thursday, November 03, 2011 7:29 AM
To: Corporon, Joe
Cc: Basinger, Corey; Meadows, Susan; Hennessy, John; Ron Hargrove; Boone, Ron
Subject: RE: NC0086762 Permit Modification - DRAFT Review of W-S / Forsyth County's Swann WTP
Joe,
Below are my comments:
1. The name of the facility should be listed as follows: P.W. Swann WTP. Please remove all references to Northwest.
2. On the "Supplement to Permit Cover Sheet" I would propose the following description under Item 141 as per
conversations with Ron Boone in our Winston-Salem Regional Office:
1. Continue to operate a wastewater treatment system employing Conventional Treatment Technology in
support of the production of potable water, utilizing:
• One (1) 0.489 MG equalization basin
1

• One (1) magnetic flow meter metering discharge from EQ basin to residuals lagoons
• One (1) 150-gallon 38% sodium bisulfite tank
• Two (2) 38% sodium bisulfite metering pumps
• Two (2) 4.3 MG residuals lagoons
• One (1) Palmer Bowlus Flume for metering NPDES discharge to creek
• Water Treatment Chemicals
• 17% aluminum sulfate - primary coagulant
• 10% sodium hypochlorite - disinfection
• 50% sodium hydroxide - pH adjustment
• zinc orthophosphate - corrosion inhibitor
• 23% fluorisilicic acid - dental health
• Wastewater Chemicals
• 38% sodium bisulfite for dechlorination of NPDES effluent
3. The last time we went through a permit review turbidity was removed from our list of parameters. Can we have it
removed from our sampling requirements?
4. Does the Division of Water Quality require a certification for turbidity?
5. If turbidity cannot be removed are there any other restrictions regarding the sample collection other than 2 per
month (i.e. do they have to be collected at least 14 days apart, etc.)? If so, please add to the footnotes.
6. Please explain what is meant under Footnote #2 by the phrase "sampling shall include all lagoon maintenance
discharges". If this is referring to our water plant basin cleanings I would request that no special sampling be required
during these periods. The increased discharge is clarified water and does not affect the quality of our discharge. I
believe the process that you intended to cover is our basin cleanings. During these we slowly drain our sedimentation
basins through our EQ basin and lagoons. Because we carefully regulate the flow and there are buffering devices (EQ
basin and lagoon volume) there is no shock to the system and no impact on our discharge. Therefore we request that
no special sampling requirements be required for this process. I have discuss this with Ron Boone in our Regional Office
and based on this conversation I believe he concurs that no special sampling is warranted.
7. Can language be added to the footnotes stating that ammonia nitrogen is only required if chloramination is used for
disinfection?
8. On the "Supplement to Permit Cover Sheet" item #2 reads as follows; "discharge from a said treatment works,
to a UT to Bashavia Creek[stream segment 12-81]....". Under A.(1.) Effluent Limitations and Monitoring Requirements it
reads as follows; "For the period beginning treated wastewater from Outfall 001 into Bethel Creek ". It is also
listed as an UT of Bashavia Creek on the bottom of the site map. Should it be listed here as an UT of Bashavia Creek or
Bethel Creek?
9. We respectfully request to have our WET testing reduced to once per year. As you can see from our history we have
passed all WET completed to date.
Feel free to contact me if you have any questions regarding my comments. I'm looking forward to hearing back from
you regarding this permit modification request.
From: Corporon, Joe [mailto:[e-mail]]
Sent: Tuesday, November 01, 2011 12:55 PM
To: Bill Brewer
Cc: Basinger, Corey; Meadows, Susan; Hennessy, John
Subject: NC0086762 Permit Modification - DRAFT Review of W-S / Forsyth County's Swann WTP
2

Corporon, Joe
From: Bill Brewer [[e-mail]]
Sent: Monday, October 31, 2011 7:38 AM
To: Corporon, Joe
Cc: Hennessy, John
Subject: RE: Review of WTP Flow data - NC0086762
Joe,
My comments are below in red. Let me know if there is anything else you need.
From: Corporon, Joe fmailto:joe.corporon(ancdenr.govl
Sent: Monday, October 31, 2011 7:32 AM
To: Bill Brewer
Cc: Hennessy, John
Subject: RE: Review of WTP Flow data - NC0086762
Bill - A few Questions about your processes:
1) Elow do you disinfect/products used? We disinfect with 10% sodium hypochlorite liquid.
2) Use of Chloramines? We use free chlorine (we do not add ammonia).
3) Backwash with fluoridated finish water? Yes.
From: Bill Brewer fmailto:[e-mail]
Sent: Monday, October 24, 2011 12:47 PM
To: Corporon, Joe
Subject: RE: Review of WTP Flow data - NC0086762
Are we going to be given input into any flow rate modifications? There are process considerations that need to be taken
into consideration also that we can provide input on.
From: Corporon, Joe f mailto:[e-mail]
Sent: Monday, October 24, 2011 11:32 AM
To: Bill Brewer
Subject: RE: Review of WTP Flow data - NC0086762
Thanks Bill, for your quick response.
To answer your query, many of your required parameters of concern have limits and flow -dependent monitoring
frequencies. Your current flow rate of 35 MGD is not correct [likely our misinterpretation at last issuance of your
production flow rate verses your wastewater flow], to be corrected with this MOD. We regret any confusion this has
caused.
More later.
From: Bill Brewer fmailto:[e-mail]
Sent: Monday, October 24, 2011 10:59 AM
To: Corporon, Joe
Subject: RE: Review of WTP Flow data - NC0086762
Hey Joe,
i

I have reviewed all of the dates and flow data below and they are correct. Each year we drain our basins to clean them
and inspect the automatic residuals removal chains and flights for maintenance purposes. That's why you see these
elevated flows at those times each fall.
How is this critical to our permit modification? Our current permit is for an average daily discharge not to exceed 35
MGD for the month.
From: Corporon, Joe[mailto:[e-mail]1
Sent: Monday, October 24, 2011 10:44 AM
To: Bill Brewer
Subject: Review of WTP Flow data - NC0086762
Bill - started your permit MOD request — reviewing your waste -discharge data.
Question: Will you please confirm the following are wastewater flows:
2.373 MGD 04Sep2010
2.053 MGD 18Sep2009
2.11 MGD 060ct2009
1.837 MGD 070ct2009
1.2 MGD 080ct2009
Considering your average without these events is —0.438 MGD, these flow records seem inordinately high [n = 883
samples, 2009-2011]. This issue is critical to your permit modification.
Respectfully,
Joe R. Corporon, L.G.
Environmental Specialist
NPDES Program
NCDENR/Division of Water Quality (DWQ)
Surface Water Protection Section
919-807-6394; 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.
2

Guerra, Bob
From: William Brewer [BILLB©cityofws.org]
Sent: Friday, April 29, 2011 4:19 PM
To: Guerra, Bob
Subject: Swann WTP Sampling Reduction Request
Attachments: NCDENR-Swann WTP NPDES Sampling Reduction Request 042911.pdf; William Brewer.vcf
Bob,
I hope this finds you doing well. I have attached for your review a sampling reduction request for the Swann WTP
(NPDES Permit # = NC86762). We have completed the acquired at least 12 sampling results for each analyte I'm
requesting a reduction for with the exception of chronic toxicity. Since we have been through 10 sampling events and
we collect 2 grab samples each time on different days we have actually collected 20 different samples for this test which
is why I'm including a request for elimination of this sampling requirement at this time.
Please call me if you have any questions regarding this data. Thanks in advance for you review of this matter/
Thanks,
Bill Brewer
Water Treatment Superintendent
City of Winston-Salem
2800 River Ridge Road
Pfafftown, NC 27040-8600
ft 336.945.1179 (OFFICE)
lir 336.399.5047 (MOBILE)
r3 336.747.9224 (FAX)
® bilibna citvofws.org
Please consider the environment before printing this e-mail.
APR 29 2011
DENR-WATER QUALITY
POINT SOURCE BRANCH
1

Winston-Salem • Forsyth County
City/County Utilities
Water • Sewer • Solid Waste Disposal
P.W. Swann WTP • 2800 River Ridge Road • Pfaffown, NC 27040 • Tel [phone] • Fax [phone]
April 29, 2011
Mr. Bob Guerra
1617 Mail Service Center
Raleigh, NC 27699-1617
Dear Mr. Guerra,
The City of Winston-Salem formally requests the following changes in monitoring
frequencies as outlined below as per your letter dated February 26, 2009. For all of these
parameters, except chronic toxicity, we have sampled in excess of the 12 times as
outlined in your letter.
1. Aluminum — Request elimination of this sampling requirement.
2. Calcium - Request elimination of this sampling requirement. —
3. Magnesium - Request elimination of this sampling requirement.
4. Manganese — No change requested.
5. Fluoride — Request elimination of this sampling requirement.*
6. Total Zinc - Request elimination of this sampling requirement.
7. Total Copper — Request sampling requirement for this parameter only when
water plant is feeding copper into raw water reservoirs for algae control.
8. Total Iron - Request elimination of this sampling requirement.
9. Total Phosphorus - Request elimination of this sampling requirement.
10. Total Nitrogen - Request elimination of this sampling requirement.
11. Chronic Toxicity - Request elimination of this sampling requirement.**
*We had one fluoride sample that measured 2.0 mg/L that we suspect the testing lab
mixed up samples in their laboratory because the data from this one sample was 2 times
higher than the dosage we feed at the water plant.
** Although we have not completed 12 sampling events for chronic toxicity we are
requesting elimination of this sampling requirement at this time due to the fact that the
sampling completed to date is represents samples collected on 20 separate days, we have
passed all chronic toxicity tests to date, and the tests demonstrate very low mortality of
organisms in the data collected.
Also attached for your review is data collected by our laboratory from the Yadkin River
upstream of the tributary that Outfall 001 discharges into. This shows the concentrations
of the analytes we are requesting a reduction for in the river naturally. As you can see
Page 1 of 2

from the data, our discharge is lower than or equal to the average concentrations in the
river for most of the analytes we are requesting a elimination or reduction for.
If you have question regarding this data after your review, please call me at (336) 945-
1179 if you wish to discuss our request.
Sincerely,
William C. Brewer
Water Treatment Superintendent
Page 2 of 2

P.W. Swann WTP NPDES Discharge Data - Outfall 001
Permit # NC086762
NPDES Sampling History
Date
Aluminum
mg/L
Calcium
mg/L
Magnesium
mg/L
Manganese
mg/L
Fluoride
mg/L
Total Zinc
ug/L
Total Copper
ug/L
Total Iron
mg/L
Total - P
mg/L
Total - N
mg/L
Toxicity
P/F
4/6/2009
<0.10
23.0
<10
<0.040
1.53
4/14/2009
0.111
4.45
1.45
0.341
P
4/17/2009
0.254
4.50
1.63
0.359
0.291
P
4/18/2009
<0.020
4/20/2009
0.17
33.0
<10
5/4/2009
<0.10
24.0
<10
<0.040
0.74
5/18/2009
0.13
26.0
<10
6/1/2009
<0.10
22.0
<10
<0.040
1.25
6/15/2009
<0.10
22.0
<10
7/6/2009
0.11
11.0
<10
<0.040
1.02
7/14/2009
0.145
4.66
1.60
0.533
0.190
P
7/17/2009
P
7/20/2009
0.10
32.0
<10
8/3/2009
0.16
12.0
<10
0.080
1.11
8/17/2009
<0.10
<10.0
<10
9/8/2009
0.13
14.0
<10
0.140
1.32
9/21/2009
0.11
<10.0
<10
10/5/2009
0.12
<10.0
<10
0.060
1.38
10/13/2009
0.341
4.68
1.42
0.149
0.272
P
10/15/2009
0.352
4.53
1.40
0.156
0.277
P
10/19/2009
0.15
13.0
<10
11/2/2009
<0.10
17.0
<10
0.050
0.78
11/16/2009
<0.10
18.0
<10
12/7/2009
<0.10
20.0
<10
0.060
1.12
12/21/2009
0.12
48.0
<10
1/4/2010
0.11
53.0
<10
<0.140
0.98
1/20/2010
0.396
4.52
1.51
0.097
0.20
53.0
<10
0.239
P
1/22/2010
0.317
4.51
1.50
0.083
0.158
P
2/1/2010
0.12
40.0
<10
0.060
1.30
2/15/2010
0.14
56.0
<10
3/1/2010
0.11
43.0
<10
0.060
1.10
3/15/2010
0.14
41.0
<10
4/5/2010
0.12
27.0
<10
<0.040
1.04
4/19/2010
0.118
3.95
1.33
0.327
0.15
20.0
<10
0.336
P
4/21/2010
0.133
4.10
1.39
0.316
0.343
P
5/3/2010
0.14
11.0
<10
0.040
1.13
5/17/2010
0.13
18.0
<10
6/2/2010
0.16
26.0
<10
0.050
1.25
6/14/2010
0.15
20.0
<10
7/7/2010
0.17
10.0
<10
0.070
1.93
7/14/2010
0.950
4.34
1.63
0.473
0.497
P
7/16/2010
0.307
4A3
1.66
0.397
0.251
P
7/19/2010
0.12
22.0
<10
8/2/2010
0.16
<10.0
<10
0.070
2.03
8/16/2010
2.00
27.0
<10
9/8/2010
0.20
15.0
<10
0.050
0.29
9/20/2010
0.23
11.0
<10
10/4/2010
0.19
13.0
<10
<0.040
0.44
10/13/2010
0.460
4.63
1.61
0.070
0.180
P
10/15/2010
0.310
4.55
1.66
0.100
0.180
P
10/18/2010
0.15
25.0
<10
11/1/2010
0.17
<10.0
<10
0.050
0.63
11/15/2010
0.25
31.0
<10
12/6/2010
0.17
10.0
<10
0.060
0.51
12/20/2010
0.22
52.0
<10
1/3/2011
0.19
55.0
<10
0.050
0.95
1/11/2011
0.298
4.56
1.52
0.034
0.115
P
1/13/2011
0.328
4.72
0.04
0.047
1.510
P
1/19/2011
0.18
50.0
<10
2/14/2011
0.24
53.0
<10
2/21/2011
0.21
62.0
<10
0.050
1.07
3/7/2011
0.15
45.0
<10
0.060
0.78
3/8/2011
0.240
4.80
1.62
0.118
0.107
P
3/10/2011
0.224
4.39
1.45
0.082
0.100
P
3/21/2011
0.16
34.0
<10
4/4/2011
0.20
34.0
<10
0.070
1.21
4/5/2011
0.879
4.01
1.30
0.262
0.614
P
4/7/2011
0.379
4.42
1.35
0.145
0.284
P
Min
Max
Average
0.111
3.950
0.042
0.034
0.100
10.000
<10
0.100
0.040
0.290
0.950
4.800
1.660
0.533
2.000
62.000
<10
1.510
0.341
2.030
0.344
4.461
1.425
0.208
0.203
29591
<10
0.330
0.077
1.076
Page 1 of 2

P.W. Swann WTP Yadkin River Raw Water Data
Permit # NC086762
Swann Raw Water Data - Yadkin River
Date
Aluminum
mg/1
Calcium
mg/L
Magnesium
mg/L
Manganese
mg/L
Fluoride
mg/L
Total Zinc
ug/L
Total Copper
ug/L
Total Iron
mg/L
Total - P
mg/L
Total - N
mg/L
Nitrate-N
mg/L
Nitrite-N
mg/L
4/6/2009
4/14/2009
4/17/2009
4/18/2009
4/20/2009
5/4/2009
5/18/2009
6/1/2009
6/15/2009
7/6/2009
0.172
4.0
1.7
0.022
<0.1
<10.0
4.0
0.38
0.215
0.53
0.008
7/14/2009
7/17/2009
7/20/2009
8/3/2009
4.428
4.0
1.8
0.091
<0.10
17.000
7.0
2.694
0.210
0.66
0.010
8/17/2009
9/8/2009
9/21/2009
10/5/2009
10/13/2009
10/15/2009
10/19/2009
11/2/2009
11/16/2009
12/7/2009
12/21/2009
1/4/2010
1/20/2010
1/22/2010
2/1/2010
2/15/2010
3/1/2010
3/15/2010
4/5/2010
4/19/2010
0.100
3.4
1.7
0.032
<0.1
<10.0
2.0
0.219
0.220
0.39
0.003
4/21/2010
5/3/2010
5/17/2010
2.173
3.2
1.9
0.112
<0.1
18.00
8.0
1.91
0.890
0.9
0.067
6/2/2010
6/14/2010
0.536
3.3
1.7
0.052
<0.1
<10.0
4.0
0.786
0.250
0.6
0.005
7/7/2010
7/14/2010
7/16/2010
7/19/2010
8/2/2010
8/16/2010
0.645
2.7
1.4
0.013
<0.1
5.000
2.0
1.084
0.080
0.93
0.005
9/8/2010
9/20/2010
10/4/2010
10/13/2010
10/15/2010
10/18/2010
11/1/2010
11/15/2010
12/6/2010
0.468
2.4
1.3
0.051
<0.1
<10.0
1.0
0.975
0.120
0.64
<0.001
12/20/2010
1/3/2011
1/11/2011
1/13/2011
1/19/2011
2/14/2011
0.099
5.8
1.9
0.040
<0.1
<10.0
1.0
0.35
0.180
0.48
0.005
2/21/2011
3/7/2011
3/8/2011
3/10/2011
3/21/2011
4/4/2011
4/5/2011
4/7/2011
Min
Max
Average
0.099
2.400
1.300
0.013
0.000
5.000
1.0
0.219
0.080
0.390
0.003
4.428
5.800
1.900
0.112
0.000
18.000
8.0
2.694
0.890
0.930
0.067
1.078
3.600
1.675
0.052
3DIV/0!
13.333
3.6
1050
0.271
0.641
0.015