NC0026441_Nutrient Reopener Condition_20161209

December 9, 2016
Tom Belnick, Supervisor
Division of Water Resources
WQ Permitting Section NDPES Unit
5I2 N. Salisbury Street (91h Floor Archdale Bldg)
Raleigh, North Carolina 27604
RE: NPDES Permit No. NC0026441
Nutrient Reopener Condition
Town of Siler City, North Carolina
Dear Mr. Belnick:
As previously discussed, Mountaire Farms is locating a new poultry processing facility in
the Town of Siler City. The Town has been in discussions with Mountaire Farms regarding the
wastewater effluent from the facility and is considering acceptance of flow with nutrient
concentrations above typical domestic wastewater concentrations.
In accordance with the terms of NPDES Permit No. NCO026441 we are providing the
attached report prepared by McGill Associates, P.A. to address Part I Permit Condition A. (3). We
trust that the information provided in this report meets the intent of the required notification,
however, if any additional information is needed please don't hesitate to contact me at 919-742-
4731 or David Honeycutt, P.E.. with McGill Associates at 910-295-3159.
We appreciate your consideration of this information. The Town is eager to address any
concerns.and we look forward to working with you and your staff to promptly fulfill necessary
requirements of the permit.
Sincerely,
Bryan Thompson
Town Manager
Enclosures
Cc: Jeff Poupart, NCDEQ Water Resources
Terry Green, Public Works Director 0a V 17
Chris McCorquodale, WWTP Operator �/ D
Mike Apke, P.E. McGill Associates I
David Honeycutt, P.E. McGill Associates DEC
1':� ZO,16

MOUNTAIRE FARMS INDUSTRIAL
PROCESS WASTEWATER TREATABILITY
EVALUATION
TOWN OF SILER CITY
CHATHAM COUNTY, NORTH CAROLINA
s -
_�
034999
David Honeycutt, P.E.
E
McGill -
A S S O C I A T E S
Engineering • Planning • Finance
5 Regional Circle, Suite A
Pinehurst, North Carolina 28374
Firm License No.: C-0459
Ph: 910-295-3159
N6vember 2016
16.04035

TABLE OF CONTENTS
Background
Current Situation
Proposed Discharge
Conclusion
Appendices
NPDES Permit
Existing Equipment Information
BioWin Model Summary - Current Conditions
BioWin Model Summary,— Future Situation with Mountaire Process Wastewater
A

Background
The Town of Siler City operates a 4.0 million gallon per day (mgd) wastewater treatment plant
(WWTP) that is permitted to discharge treated effluent to Loves Creek upstream of the Rocky
River under National Pollutant Discharge Elimination System (NPDES) Permit Number
NC0026441. Flows to the plant over the most recent 12 months have averaged 1.87 mgd. The
current treatment system was most recently upgraded in 1994 and includes influent screening, grit
removal, flow equalization, dual train oxidation ditches, dual flocculating clarifiers, tertiary filters,
and chlorine disinfection.
In addition to current flows, the Town proposes to accept industrial wastewater from the Mountaire
Farms Poultry Processing Plant to be located on East 3rd Street in Siler City. The Town's NDPES
Permit requires that notification be submitted to the NPDES Permitting Unit when the Town is
considering acceptance of nutrient load above typical domestic levels. The notification is required
to include proposed discharge flow, composition, and treatability in the Siler City WWTP. This
document is intended to address these requirements and provide an analysis of the treatability of
this waste stream in the existing WWTP.
Current Situation
The biological treatment process for the Siler City WWTP includes dual train oxidation ditches
with each basin having a volume of 2.015 million gallons. At the permitted capacity of 4.0 mgd,
these tanks provide approximately 24.2 hours of hydraulic detention time. The tanks are aerated
by a j et aeration system with multi -stage centrifugal blowers. Original equipment information from
MTS Systems is included in the appendix.
Effluent from the oxidation ditches flows to dual flocculating clarifiers, each with a diameter of
90 feet. Chemical feed equipment is present and operational to add aluminum sulfate for
phosphorus removal and lime for pH stabilization. After clarification, the flow is filtered prior to
chlorine disinfection, de -chlorination, and discharge to Loves Creek. Solids are aerobically
digested and removed as liquid sludge after thickening. See attached Figure 1 Process Flow
Schematic for overall plant configuration.
The current NPDES permit limits are as shown in Table 1. As Noted, the Town is currently limited
for Total Phosphorus (TP) but is required to only monitor Total Nitrogen (TN). In 1994, when the
facility was most recently upgraded it was receiving significant poultry processing loads and was
designed for treatment of wastewater with higher than typical domestic strength. The WWTP
design addressed removal of TP and ammonia but was not intended for significant removal of TN.
Mountaire Farms Industrial Process Wastewater Treatability Evaluation Siler City WWTP
November 2016 Page 1 Town of Siler City

CHLORINE TERTIARY
CONTACT AND FILTERS
POST-AERATION
TO
LOVES
CREEK TO SLUDGE
DIGESTION AND
DISPOSAL
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FLOW EQUALIZATION i i
WAS_
TANKS
(2.0 MG IN SERVICE)
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90' DIAM. 90' DIAM.
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INFLUENT
SCREEN GRIT
REMOVAL INFLUENT
I
PUMP STATION I
OXIDATION OXIDATION I
DITCH DITCH I
(2.015 MG) (2.015 MG)
I
I
I
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------------ SLUDGE LINES
WASTEWATER LINES
❑ SPLITTER/JUNCTION BOX
McGM JOB NO,: 10.04035
WASTEWATER TREATABILITY EVALUATION DATE: NOVEMBER2016 SHEET
DESIGNED BY: DLH
CADD BY: MRJ LIQUID TRAIN PROCESS FLOW
Y DESIGN REVIEW:_
A S S O C I A T E S TOWN OF SILER CITCONST. REVIEW: _ SCHEMATIC FSG.
ENGINEER ING•PLA N NTNG-FINANCE 11.14035 G013 Pro Flaw
SR 10N.ILCIRCLESUMAPINENURST.NCW74 R9d9100E 3159 FlWUWSE#M59 CHATHAM COUNTY, NORTH CAROLINA Schematladw0

Table 1: Existing Siler Citv WWTP NPDES Permit Limits
Parameter
Monthly
Average
Weekly
Average
Flow (mgd)
4.0
1.87
BOD (mg/1) April -October
5.0
7.5
BOD (mg/1) November — March
10.0
15.0
TSS (mg/1)
30
45
NH3 (mg/1) April -October
1.0
3.0
NH3 (mg/1) November - March
2.0
6.0
TP (mg/1) April -October
0.5 (quarterly
average)
TP (mg/1) November - March
2.0 (quarterly average)
TN (mg/l)
Monitor Only
Although the WWTP has previously handled significant industrial loading, including poultry
processing wastewater, current flows and loadings have been reduced. The current influent BOD,
TSS, and TKN concentrations are below typical municipal wastewater strengths. Table 2 provides
a summary of existing influent water quality from the plant's Discharge Monitoring Reports
(DMR) dated October 2015 — September 2016.
Table 2: Existing Siler Citv WWTP Influent Water Ouality (Oct. 2015 -Sept. 2016)
Parameter
Average
Maximum
Minimum
Flow (mgd)
1.87
6.17
1.15
BOD (mg/1)
136
278
44
TSS (mg/1)
186.5
658
32
TKN (mg/1)
25.97
30
18.7
Ammonia (mg/1)
16.2
18.8
11.7
TP (mg/1)
3.08
3.37
2.51
Notes:
1. Influent TKN and TP are based on three samples as collected for the facility pretreatment program.
2. Influent ammonia is not sampled. Values are estimated at 62.5% of TKN
The treatment system is currently performing very well due to several factors including, flows of
less than 50% of design capacity, and influent strength below design parameters. Based on the
operation and maintenance information from the equipment manufacturer's design, the WWTP
was originally designed for an average daily flow of 4.0 mgd, influent BOD of 350 mg/1 and
influent ammonia of 45 mg/l. Effluent BOD and ammonia were designed to meet 5 mg/l and 1
mg/l respectively. A summary of the average effluent quality for the past 12 months is provided in
Table 3.
Mountaire Farms Industrial Process Wastewater Treatability Evaluation Siler City WWTP
November 2016 Page 3 Town of Siler City

Table 3: Existing Siler City WWTP Effluent Water Quality (Oct. 2015 -Sept. 2016)
Parameter
Average
90th Percentile
Flow (mgd)
1.87
2.72
BOD (mg/1)
2.0
4.36
TSS (mg/l)
1.5
1.25
TN (mg/1)
11.8
24.6
Ammonia (mg/1)
0.3
0.25
TP (mg/1)
0.2
0.36
Analysis assumes '/z detection level for all non -detect samples. TSS and Ammonia are mostly non -detect which
causes the 90th percentile to be lower than the average.
TP levels in the WWTP's effluent are typically very low with all but one sample below 0.5 mg/l
and numerous samples below detection level. The plant utilizes alum addition to chemically
remove the phosphorus in the flocculating clarifiers. The graph below shows the trend for effluent
TP. Nitrogen is more variable but the plant has averaged approximately 55% removal over the past
12 months. The WWTP only samples influent TKN and TP on a quarterly basis so influent data is
relatively limited for these parameters. The WWTP was not designed to remove TN and does not
include a designated anoxic zone for denitrification. Due to the long detention time in the oxidation
ditch and aeration patterns that focus the air in portions of the tank, simultaneous nitrification and
denitrification (SND) is occurring in the process. The nitrogen removal seen in the existing
conditions is likely the result of a combination of the SND process and nitrogen removed in the
waste sludge.
fSiler City WWTP
Effluent Phosphorus
(10/2015 through 9/2016)
LI
t
N c -I N \ N \ N \ ci \ Q ('!) .--I N c -I N \ N \ c-1
ul \ \ \ \ \ \ CO \ M --
H
v -i H c -I N N -q �--i N ro Ln m l0 w I,, l OO M
Sample Date
Mountaire Farms Industrial Process Wastewater Treatability Evaluation Siler City WWTP
November 2016 Page 4 Town of Siler City

Siler City WWTP
Effluent Nitrogen
(10/2015 through 9/2016)
35
30
a O
\ 25
on
z
20
15
LU 10
5 - - -
0 _.. .
Ln (n N LD O d' oo rl to o0 N I, ci C' 00 N l0 O M f\ .--1 M W N M M
\ r1 \ ci M ci N .-i N \ N \ N \ ri \ ri M ci N r-1 N \ N \ .--1
O \ d \ \ \ \ \ \ N \ M \ d' \ In \ \ \ \ \ \ 00 \ M --
C)
O i--1 ci ci N N ci r-1 N M M Ln lD LD !" 1, 00 Ql
ci ci ci a -I c -I
Sample Date
Existing Conditions Biowin Model
A WWTP modeling software, Biowin, was also utilized to analyze the treatment facilities. The
model was setup to represent the physical configuration of the plant including tank volumes,
average influent flow, chemical feed systems, clarifier sizes, and return sludge flows. The model
utilizes 10 reactor tanks to represent the varying conditions found in the oxidation ditch process
and distribution of aeration. To maintain mixing in the oxidation ditch flow around the ditch is
approximately 1 ft/s and is represented as recirculation through the zones at 930 mgd.
Operating data indicates typical MLSS concentrations are between 7,000-8,000 mg/1. At these high
MLSS concentrations, sludge age is estimated to be approximately 150 days. As expected at these
underloaded conditions the plant is providing complete nitrification and typical effluent BOD's
are very low. At current average daily flows, the clarifier overflow rate is approximately 146
gpd/square foot and solids loading is approximately 1.07 lbs/square foot / hour. Per Metcalf and
Eddy 4th Edition these values are in the lower range of typical design values.
Although BioWin does not include components specific to jet aeration, model parameters for
diffused air are setup to represent the aeration characteristics of the jet aeration system including
the design Oxygen Transfer Efficiency (OTE) of approximately 28%. An Aluminum Sulfate feed
is incorporated to represent the chemical phosphorus removal. Default kinetic parameters were
utilized with the exception of the Ordinary Heterotrophic Organisms (OHO) DO Half Saturation
Switch which was increased to 0.4 mg/l to account for the SND process typical of oxidation
ditches. Utilizing these conditions the model readily shows the high levels of BOD, TSS, and TP
removal and complete nitrification of influent ammonia. The TN predicted in the effluent is
approximately 12 mg/l at steady state which is consistent with the average TN for the facility. Note
that the filters were not included in the model as the effluent TSS from the clarifier is low under
Mountaire Farms Industrial Process Wastewater Treatability Evaluation Siler City WWTP
November 2016 Page 5 Town of Siler City

steady state loading conditions and filtration is insignificant to the model. A summary of the
BioWin modeling results are included in the appendix.
Proposed Discharge
Mountaire Farms proposes to construct a poultry processing facility on 3rd Street in Siler City at
the location previously operated by Townsend. The facility will employ over 500 people and
current projections are to begin production in January 2018. Mountaire intends to purchase water
from the Town of Siler City -and discharge domestic and poultry processing wastewater to the
Town's collection system.
Preliminary information submitted by Mountaire indicates that a pretreatment system consisting
of primary and secondary dissolved air flotation (DAF) units will be constructed on the poultry
processing facility site. The primary DAF will include a polymer conditioning step while the
second DAF will include addition of a metal salt (Ferric Chloride) coagulant to improve removal
of BOD, TSS, and fats, oils and grease (FOG) present in the raw wastewater stream. This treatment
process will also precipitate a significant portion of TP from the soluble form for its subsequent
removal. Mountaire has agreed that it can meet the flow characteristics listed below as potential
permit limits for discharge to the Siler City collection system.
A formal application for a pretreatment permit or authorization to construct the pretreatment
system have not been received by Siler City at this time. Should the final parameters vary
significantly from these preliminary values, impacts of those changes should be reviewed. Actual
discharge characteristics are anticipated to be below these levels; however, the preliminary limits
have been used for this analysis as a conservative approach. Table 4 below provides a summary of
the current influent flow characteristics, projected Mountaire flow characteristics, and a mass
balance based combined influent stream.
Table 4: WWTP Influent Characteristics- Anticipated Combined Waste Stream
The additional BOD and TKN loading will increase demands on the plant aeration system. The
existing system was designed for higher than typical domestic strength wastewater as poultry
processing was occurring in Siler City when the plant upgrade was completed in 1994.
Manufacturer's information indicates a design BOD of 350 mg/1 and ammonia of 45 mg/l were
accounted for in the design. Due to the low current loadings and the design of the WWTP the
combined waste stream is well below the design parameters at approximately 64% of flow and, on
Mountaire Farms Industrial Process Wastewater Treatability Evaluation Siler City WWTP
November 2016 Page 6 Town of Siler City
WWTP INFLUENT
FLOW
BOD
NH3
TSS
TKN
TP
MGD
mg/L
mg/L
mg/L
mg/L
mg/l
Current Influent Flow Characteristics
1.87
136
16.2
186.5
25.97
3.08
Mountaire Flow Characteristics
0.7
450
60
150
125
3
Combined Influent Stream
2.57
221.5
28.1
176.6
52.9
3.1
WWTP Design Parameters
4.0
350.0
45.0
Percent Design Capacity w/ Mountaire
64%
63%
63%
The additional BOD and TKN loading will increase demands on the plant aeration system. The
existing system was designed for higher than typical domestic strength wastewater as poultry
processing was occurring in Siler City when the plant upgrade was completed in 1994.
Manufacturer's information indicates a design BOD of 350 mg/1 and ammonia of 45 mg/l were
accounted for in the design. Due to the low current loadings and the design of the WWTP the
combined waste stream is well below the design parameters at approximately 64% of flow and, on
Mountaire Farms Industrial Process Wastewater Treatability Evaluation Siler City WWTP
November 2016 Page 6 Town of Siler City

a concentration basis, 63% of BOD and Ammonia. Calculations included in the appendix concur
with this information and indicate the facility has adequate aeration equipment to meet oxygen
demands and maintain DO levels of 2.0 mg/l in the oxidation ditches.
As noted previously the Siler City WWTP is currently underloaded and operating at a very high
Solids Retention Time (SRT). The additional loading on the biological process will reduce the
SRT and result in a higher percent of volatile solids and active biomass in the treatment system.
These changes to the influent stream were modeled utilizing BioWin software to evaluate the
impacts and predict effluent quality. A MLSS concentration of 4,000 mg/l was set in the model
per design conditions. Higher MLSS concentrations, as are currently being used, were reviewed
but had minimal impact on effluent quality due to the high SRT of 48 days at 4,000 mg/l MLSS.
The model indicates that the plant can achieve removal of the BOD, TSS, and TP under these
loadings as it was designed. The WWTP will continue to provide complete nitrification with
effluent ammonia concentrations projected to be well under 1 mg/1. Similar to operation under the
current situation, SND will continue to occur in the oxidation ditch and result in some nitrogen
removal. The anticipated WWTP effluent TN concentration is approximately 30 mg/l.
Alkalinity is consumed at a high rate for nitrification of ammonia and can cause a decrease in pH
if insufficient alkalinity is present in the wastewater stream. The existing facilities include a lime
silo, slurry mixing tank and feed system to maintain sufficient alkalinity for a stable pH. Table 5
summarizes the anticipated effluent quality of the Siler City WWTP upon acceptance of the
additional domestic and process wastewater from the Mountaire Farms plant.
Table 5e Siler Citv WWTP Anticipated Effluent Qualitv with Mountaire Farms
Parameter
NPDES Permit
Monthly
Average
Anticipated
Effluent
Flow (mgd)
4.0
2.57
BOD (mg/1) April -October
5.0
<5.0
BOD (mg/1) November — March
10.0
<5.0
TSS (mg/1)
30
<5.0
NH3 (mg/1) April -October
1.0
<1.0
NH3 (mg/1) November - March
2.0
<1.0
TP (mg/1) April -October
0.5 (quarterly
average)
<0.5
TP (mg/1) November - March
2.0 (quarterly
average)
<0.5
TN (mg/1)
Monitor Only
3 0 mg/l
As previously noted, the WWTP has two circular flocculating clarifiers with 90 ft diameters. The
total effective settling area for the two clarifiers is 12,723 SF giving an overflow rate of 314 gpd/SF
at the 4.0 mgd design flow and 202 gpd/SF at the future flow with current average flows and
Mountaire flow combined. Solids loading rate under this scenario is approximately 0.7 lbs/SF/hr.
Mountaire Farms Industrial Process Wastewater Treatability Evaluation Siler City WWTP
November 2016 Page 7 Town of Siler City

These loadings are .well within typical recommended rates and the existing clarifiers should
therefore provide good performance up to plant design flow.
Conclusions
The existing Siler City WWTP average flow for the past year has been approximately 1.87 mgd
which is less than 50% of the design capacity for the facility. The Town is considering acceptance
of additional wastewater from the Mountaire Farms processing plant of approximately 0.7 mgd,
which would increase total average daily flow to the Siler City WWTP to 2.57 mgd. The
treatability of this waste stream has been reviewed to evaluate impacts to the current WWTP and
determined that the plant should be capable of meeting current NPDES Permit limits with this
additional loading.
Mountaire Farms Industrial Process Wastewater Treatability Evaluation Siler City WWTP
November 2016 Page 8 Town of Siler City

APPENDICES

Permit NCO026441
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
NPDES PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
DES
In compliance with the provision 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, the
Town of Siler City
is hereby authorized to discharge wastewater from a facility located at the
Town of Siler City WWTP
370 Waste Treatment Plant Road
Chatham County
to receiving waters designated as Loves Creek within the Cape Fear River Basin, in accordance with effluent
limitations, monitoring requirements, and other conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective June 1, 2014.
This permit and authorization to discharge shall expire at midnight May 31, 2019.
Signed this day April 30, 2014.
Original Signed by Tom Belnick
Thomas A. Reeder, Director
Division of Water Resources
By Authority of the Environmental Management Commission

Permit NCO026441
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked. As of this permit 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 included herein.
The Town of Siler City is hereby authorized to:
1. Continue discharging 4.0 MGD of treated process and domestic wastewater from a treatment facility
consisting of
• Automatic and manual bar screens
© Grit collection unit
a Influent pump station
• Influent Equalization Basin (Zone 2)
• Dual oxidation ditches with surface jet aeration
• Flow Splitter Box
o Alum feed station
o Lime feed station
• Dual secondary clarifiers
• Dual Aerobic digesters
• Return Activated Sludge
• Sludge Transfer Station
• Dissolved Air Flotation Unit (Used as needed)
• Sludge Thickener Basin
• Influent equalization or Sludge Storage Basins (Zone 3 A & B used as needed)
• Four (4) tertiary filters
• Filter Backwash Basin
• Gaseous Chlorine Disinfection
• Chlorine contact chamber
• Gaseous Sulfur dioxide Dechlorination
• Step -Aeration
This facility is located at the Siler City WWTP at 370 Waste Treatment Plant Road near Siler City in Chatham
County.
2. Discharge from said wastewater treatment works through Outfall 001 into Loves Creek (see attached map), a
stream classified as C waters within the Cape Fear River Basin.
Page 2 of 10

Permit NCO026441
Part I
A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
a. During the period beginning with the effective date and lasting until expiration, the Permittee is authorized to discharge
treated wastewater through Outfall 001. Such discharges shall be limited and monitored' by the Permittee as specified below:
Footnotes:
1. No later than March 1, 2015, begin submitting discharge monitoring reports electronically using NC DWR's eDMR
application system. See Condition A. (7).
2. Instream monitoring shall be performed in accordance with Condition A. (2).
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15 % of the respective
influent value (i.e., 85% removal is required).
4. TRC limits and monitoring requirements apply only if chlorine or chlorine derivatives are used for disinfection. The
Permittee shall report all effluent TRC values reported by a NC -certified laboratory [including field -certified]. Effluent
values below 50 µg/L will be treated as zero for compliance purposes.
5. Compliance with the Total Phosphorus limits shall be based on a calendar -quarter average of weekly samples.
6. Total Cadmium limits become effective December 1, 2015. Monitoring shall begin on the effective date. See
Condition A. (6).
Page 3 of 10
EFFLUENT
LIMITS
MONITORING REQUIREMENTS
PARAMETERS
Monthly
Weekly
Daily
Measurement
Sample
Sample
Average
Average
Maximum
Frequency
Type__
Location
Flow
4.0 MGD
Continuous
Recording
went or
Effluent
BOD, 5 day, 20°C3
5.0 mg/L
7.5 mg/L
Daily
Composite
Influent and
(April 1 thru October 31)
Effluent
BOD, 5 day, 20°C 3
10.0 mg/L
15.0 mg/L
Daily
Composite
Influent and
(November 1 thru March 31)
Effluent
Total Suspended Solids3
30.0 mg/L
45.0 mg/L
Daily
Composite
1 d
fluentfflue
NH3 as N
1.0 mg/L
3.0 mg/L
Daily
Composite
Effluent
(April 1 thru October 31)
NH3 as N
2.0 mg/L
6.0 mg/L
Daily
Composite
Effluent
(November 1 thru March 31)
Fecal Coliform
(geometric mean)
200/ 100 ml
400/ 100 ml
Daily
Grab
Effluent
Total Residual Chlorine (TRC)4
17 µg/L
Daily
Grab
Effluent
Temperature (°C)
Daily
Grab
Effluent
Dissolved Oxygen
Daily average > 6.0 mg/L
Daily
Grab
Effluent
pH
> 6.0 and < 9.0 standard units
Daily
Grab
Effluent
Total Nitrogen
(NO2 + NO3 + TKN)
Weekly
Calculated
Effluent
NO3-N + NO2-N (mg/L)
Weekly
Composite
Effluent
TKN (mg/L)
Weekly
Composite
Effluent
Total Phosphorus'
-(April 1 thru September 30)
0.5 mg/L (quarterly average)
Weekly
Composite
Effluent
Total Phosphorus
(October 1 through March 31)
2.0 mg/L (quarterly average)
Weekly
Composite
Effluent
Total Cadmium 6
2.1 µg/ L 15.5 µg/ L
Monthly
Composite
Effluent
Total Copper
Quarterly'
Composite
Effluent
Total Zinc
Quarterly'
Composite
Effluent
Chloride
Quarterly
Composite
Effluent
Chronic Toxicity8
Quarterly
Composite
Effluent
Effluent Pollutant Scan
Monitor and Report
Footnote 9
Footnote 9
Effluent
Footnotes:
1. No later than March 1, 2015, begin submitting discharge monitoring reports electronically using NC DWR's eDMR
application system. See Condition A. (7).
2. Instream monitoring shall be performed in accordance with Condition A. (2).
3. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15 % of the respective
influent value (i.e., 85% removal is required).
4. TRC limits and monitoring requirements apply only if chlorine or chlorine derivatives are used for disinfection. The
Permittee shall report all effluent TRC values reported by a NC -certified laboratory [including field -certified]. Effluent
values below 50 µg/L will be treated as zero for compliance purposes.
5. Compliance with the Total Phosphorus limits shall be based on a calendar -quarter average of weekly samples.
6. Total Cadmium limits become effective December 1, 2015. Monitoring shall begin on the effective date. See
Condition A. (6).
Page 3 of 10

Permit NCO026441
Footnotes A.(1) Continued:
7. Sample Quarterly in conjunction with Chronic Toxicity Test.
8. Chronic Toxicity (Ceriodaphnia) at 90 %; quarterly during March, June, September, December [see Condition A. (8)].
9. The permittee shall perform three Effluent Pollutant Scans during the term of this permit [see Condition A. (9)].
b. Effluent shall contain no floating solids or foam visible in other than trace amounts.
A. (2) INSTREAM MONITORING REQUIREMENTS
Parameter
Sample Type
Location 1
Measurement Frequency z
Dissolved Oxygen
Grab
LCU, LCD, RRU, RRD
3/Week (June— September),
1/Week (October -May)
Temperature
Grab
LCU, LCD, RRU, RRD
3/Week (June— September),
l/Week (October -May)
Total Phosphorus
Grab
LCU, LCD, RRU, RRD
Monthly
TKN
Grab-
LCU, LCD, RRU, RRD
Monthly
NO, -N + NO, -N
Grab
LCU, LCD, RRU, RRD
Monthly
Footnotes:
1. LCU - Loves Creek, upstream of the discharge; LCD - Loves Creek, downstream of the discharge and above the
confluence with the Rocky River; RRU — Rocky River, upstream of the confluence with Loves Creek; RRD — Rocky
River, downstream of the confluence with Loves Creek.
2. All monitoring is required to be performed at the above-mentioned monitoring locations. Instream Monitoring
may be performed by the Upper Cape Fear River Basin Association as outlined in the Memorandum of Agreement
(MOA) between the association and the permittee. If so, the data is to be collected and submitted to DWR in
accordance to the terms of the MOA. Should membership in this association terminate for any reason, the permittee
shall immediately notify the Division's NPDES Unit in writing and resume responsibility to monitor and report the
above parameters as specified in this permit.
A. (3) NUTRIENT REOPENER
In the event that Permittee proposes to accept future industrial process wastewater that is expected to contain
concentrations of Total Nitrogen (TN) and/ or Total Phosphorus (TP) greater than typical domestic wastewater
concentration (i.e. greater than 40.0 mg/ L TN or greater than 5.0 mg/ L TP), the Permittee shall notify the NPDES
Complex Permitting Unit of the Division at 1617 Mail Service Center, Raleigh, NC 27699 and the Raleigh
Regional Office at 3800 Barrett Drive, Raleigh, NC 27609 within 30 days of knowledge that the town is
considering accepting new industrial process wastewater containing excess nutrients. The notification shall contain
information regarding the proposed discharge flow, composition and treatability in the Siler City WWTP. Changes
in effluent characteristics may require a permit modification, so notification should be at least 180 days prior to the
start of the proposed discharge.
Based on information provided by the Town regarding a potential new industrial process wastewater with high
nutrient concentration, and pursuant to N.C. General Statute Section 143-215.1 and the implementing rules found in
Title 15A of the North Carolina Administrative Code, Subchapter 2H, specifically, 15A NCAC 2H.0I 12(b) (1) and
2H.01 14(a), and Part II, Sections B-12 and B-13 of this permit, the Director of DWR may then reopen this permit
to require supplemental nutrient limits for Total Nitrogen and/ or Total Phosphorus in accordance with the current
Basin Plan for the Cape Fear River Basin.
Page 4of10

Permit NCO026441
A. (4) NUTRIENT WATER QUALITY MODELING REOPENER
Pursuant to N.C. General Statutes Section 143-215.1 and the implementing rules found in the North Carolina
Administrative Code at 15A NCAC 2H.0112 (b) (1) and 2H.0114 (a) and Part II sections B-12 and B-13 of this
permit, the Director of DWR may reopen this permit to require supplemental nutrient monitoring of the discharge.
The purpose of the additional monitoring will be to support water quality modeling efforts within the Cape Fear
River Basin and shall be consistent with a monitoring plan developed jointly by the Division and affected
stakeholders. In addition, the results of water quality modeling may require that limits for total nitrogen and total
phosphorus be imposed or modified in this permit upon renewal.
A. (5) MERCURY M11XIMIZATION PLAN (MMP)
The permittee shall develop and implement a mercury minimization plan (MMP) during this permit term. The
MMP shall be developed by December 1, 2014, and shall be available for inspection on-site. A sample MMP was
developed through a stakeholder review process and has been placed on the Division website for guidance
(http://portal.nedenr.org/web/Wq/swp/ps/npdes, under Model Mercury Minimization Plan): The MMP should place
emphasis on identification of mercury contributors and goals for reduction. Results shall be summarized and
submitted with the next permit renewal.
A. (6) COMPLIANCE SCHEDULE FOR TOTAL CADMIUM LIMITS
The effluent limits for Total Cadmium shall become effective on December 1, 2015. Monitoring shall begin on the
permit effective date. Effluent limits and monitoring may be deleted in the future upon written notification of the
Division, if the Permittee provides updated effluent data that shows no reasonable potential to exceed applicable
State water quality standards. Specifically, if 12 monthly data points for cadmium are all less than 2.0 µg/ L, then
the Permittee may petition the Division for removal of Total Cadmium limits and monitoring from the permit.
A. (7) ELECTRONIC REPORTING OF DISCHARGE MONITORING REPORTS
Proposed federal regulations require electronic submittal of all discharge monitoring reports (DMRs) and specify
that, if a state does not establish a system to receive such submittals, then permittees must submit DMRs
electronically to the Environmental Protection Agency (EPA). The Division anticipates that these regulations will
be adopted and is beginning implementation in late 2013.
NOTE: This special condition supplements or supersedes the following sections within Part II of this permit
(Standard Conditions for NPDES Permits):
• Section B. (11.) Signatory Requirements
• Section D. (2.) Reporting
• Section D. (6.) Records Retention
• Section E. (5.) Monitoring Reports
Page 5 of 10

Permit NCO026441
1. Reporting [Supersedes Section D. (2.) and Section E. (5.) (a)1
Beginning no later than March 1, 2015, the permittee shall begin reporting discharge monitoring data
electronically using the NC DWR's Electronic Discharge Monitoring Report (eDMR) internet application,
unless a temporary waiver from eDMR requirements has been granted.
Monitoring results obtained during the previous month(s) shall be summarized for each month and submitted
electronically using eDMR. The eDMR system allows permitted facilities to enter monitoring data and submit
DMRs electronically using the internet. Until such time that the state's eDMR application is compliant with
EPA's Cross -Media Electronic Reporting Regulation (CROMERR), permittees will be required to submit all
discharge monitoring data to the state electronically using eDMR and will be required to complete the eDMR
submission by printing, signing, and submitting one signed original and a copy of the computer printed eDMR
to the following address:
NC DENR / DWR / Information Processing Unit
ATTENTION: Central Files / eDMR
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
If a permittee is unable to use the eDMR system due to a demonstrated hardship or due to the facility being
physically located in an area where less than 10 percent of the households have broadband access, then a
temporary waiver from the NPDES electronic reporting requirements may be granted and discharge monitoring
data may be submitted on paper DMR forms (MR 1, 1. 1, 2, 3) or alternative forms approved by the Director.
Duplicate signed copies shall be submitted to the mailing address above.
Requests for temporary waivers from the NPDES electronic reporting requirements must be submitted in
writing to the Division for written approval at least sixty (60) days prior to the date the facility would be
required under this permit to begin using eDMR. Temporary waivers shall be valid for twelve (12) months and
shall thereupon expire. At such time, DMRs shall be submitted electronically to the Division unless the
permittee re -applies for and is granted a new temporary waiver by the Division.
Information -on eDMR and application for a temporary waiver from the NPDES electronic reporting
requirements is found on the following web page:
http://portal.nedenr. orWweb/wq/admin/bo g/ipu/edmr.
Regardless of the submission method, the first DMR is due on the last day of the month following the issuance
of the permit or in the case of a new facility, on the last day of the month following the commencement of
discharge.
2. Signatory Requirements [Supplements Section B. (11.) (b) and supersedes Section B. (11.) (d)1
All eDMRs submitted to the permit issuing authority shall be signed by a person described in Part II, Section B.
(I 1.)(a) or by a duly authorized representative of that person as described in Part II, Section B. (11.)(b). A
person, and not a position, must be delegated signatory authority for eDMR reporting purposes.
For eDMR submissions, the person signing and submitting the DMR must obtain an eDMR user account and
login credentials to access the eDMR system. For more information on North Carolina's eDMR system,
registering for eDMR and obtaining an eDMR user account, please visit the following web page:
http://portal.nedenr.or. web/wq/admin/boyTpu/edrnr.
Page 6 of 10

Permit NC0026441
Certification. Any person submitting an electronic DMR using the state's eDMR system shall make the
following certification [40 CFR 122.22]. NO OTHER STATEMENTS OF CERTIFICATION WILL BE
ACCEPTED:
U cert, under penalty of law, that this document and all attachments were prepared under my direction or
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those persons directly responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for
submitting false information, including the possibility of fines and imprisonment for knowing violations."
3. Records Retention [Supplements Section D. (6.)]
The permittee shall retain records of all Discharge Monitoring Reports, including eDMR submissions. These
records or copies shall be maintained for a period of at least 3 years from the date of the report. This period
may be extended by request of the Director at any time [40 CFR 122.41].
Page 7 of 10

Permit NCO026441
A. (8) CHRONIC TOXICITY PERMIT LIMIT (Quarterly)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to at an effluent
concentration of 90%.
The permit holder shall perform at a minimum, _quarterly monitoring using test procedures outlined in the "North Carolina
Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised December 2010, or subsequent versions or "North Carolina
Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised- December 2010) or subsequent versions. The tests will be
performed during the months of March, June, September and December. These months signify the first month of each
three month toxicity testing quarter assigned to the facility. Effluent sampling for this testing must be obtained during
representative effluent discharge and shall be performed at the NPDES permitted final effluent discharge below all treatment
processes.
If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit,
then multiple -concentration testing shall be performed at a minimum, in each of the two following months as described
in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -December 2010) or subsequent
versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form
(MR -1) for the months in which tests were performed, using the parameter code TGP3B for the pass/fail results and THP3B
for the Chronic Value. Additionally, DWQ Form AT -3 (original) is to be sent to the following address:
Attention: North Carolina Division of Water Resources
Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 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, accurate, include all supporting chemical/physical measurements and all concentration/response
data, and be certified by laboratory supervisor and ORC or approved designate signature. 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, monitoring will be required
during the following month. Assessment of toxicity compliance is based on the toxicity testing quarter, which is the three
month time interval that begins on the first day of the month in which toxicity testing is required by this permit and continues
until the final day of the third month.
Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Resources
indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring
requirements or limits.
If the Permittee monitors any pollutant more frequently than required by this permit, the results of such monitoring shall be
included in the calculation & reporting of the data submitted on the DMR & all AT Form submitted.
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.
Page 8 of 10

Permit NCO026441
A. (9) EFFLUENT POLLUTANT SCAN
The Permittee shall perform a total of three (3) Effluent Pollutant Scans for all parameters listed below. One scan
must be performed in each of the following years: 2016, 2017, and 2018.
Analytical methods shall be in accordance
with 40 CFR Part 136 and shall be sufficiently sensitive to determine whether parameters are present in concentrations
greater than applicable standards and criteria. Samples should be collected with one quarterly toxicity test each year,
and must represent seasonal variation [i.e.,
do not sample in the same quarter every year]. Unless otherwise indicated,
metals shall be analyzed as "total recoverable."
Ammonia (as N)
Trans- l,2-dichloroethylene
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
1,1-dichloroethylene
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhexyl) phthalate
Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,2 -tetrachloroethane
Di -n -butyl phthalate
Antimony
Tetrachloroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1 -trichloroethane
1,2 -dichlorobenzene
Cadmium
1,1,2 -trichloroethane
1,3 -dichlorobenzene
• Chromium
Trichloroethylene
1,4 -dichlorobenzene
Copper
Vinyl chloride
3,3-dichlorobenzidine
Lead
Acid -extractable compounds:
Diethyl phthalate
Mercury (EPA Method 1631E)
P -chloro -m -cresol
Dimethyl phthalate
Nickel
2 -chlorophenol
2,4-dinitrotoluene
Selenium
2,4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4 -dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dinitro-o-cresol
Fluoranthene
Zinc
2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile organic compounds:
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol
Hexachloroethane
Acrylonitrile
2,4,6 -trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene Base -neutral compounds:
Isophorone
Bromoform
Acenaphthene ,
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-chloroethylvinyl ether
Benzo(a)pyrene
Phenanthrene
Chloroform '
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
1,2,4-trichlorobenzene
1,1-dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
Reporting. Test results shall be reported on DWR Form -A MR-PPA1 (or in a form approved by the Director) by
December 31" of each designated sampling year. The report shall be submitted to the following address: NC
DENR / DWR / Central Files, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
Page 9 of 10

Permit NCO026441
Additional Toxicity Testing Requirements for Municipal Permit Renewal. Please note that Municipal facilities
that are subject to the Effluent Pollutant Scan requirements listed above are also subject to additional toxicity
testing requirements specified in Federal Regulation 40 CFR 122.210)(5). The US EPA requires four (4) toxicity
tests for a test organism other than the test species currently required in this permit. The multiple species tests
should be conducted either quarterly for a 12 -month period prior to submittal of the permit renewal application, or
four tests performed at least annually in the four and one half year period prior to the application. These tests shall
be performed for acute or chronic toxicity, whichever is specified in this permit. The multiple species toxicity test
results shall be filed with the Aquatic Toxicology Branch at the following address:
North Carolina Division of Water Resources
Water Sciences Section/Aquatic Toxicology Branch
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Contact the Division's Aquatic Toxicology Branch at 919-743-8401 for guidance on conducting the additional
toxicity tests and reporting requirements. Results should also be summarized in Part E (Toxicity Testing Data) of
EPA Municipal Application Form 2A, when submitting the permit renewal application to the NPDES Permitting
Unit.
M
Page 10 of 10

m
JET AERATION AND
MIXING SYSTEM
SUBMITTAL DATA
FOR
TOWN OF SILER CITY, NORTH CAROLINA
WASTEWATER TREATMENT
PLANT EXPANSION
SRF NO. CS370427-04
SPECIFICATION SECTION 12
-OXIDATION DITCHES-
-SLUDGE HOLDING TANKS-
-FLASH MIXING TANK-
MTS#M91-143
NNE 2, 1992
ENGINEER:
HOBBS, UPCHURCH & ASSOCIATES,
290 S.W. BROAD STREET
SOUTHERN PINES, NC 28388
CONTRACTOR:
STATE UTILITY CONTRACTORS, INC.
MONROE, NC
MTS REPRESENTATIVE:
COMBS & ASSOCIATES, INC.
P. 0. BOX 32185
CHARLOTTE, NC 28232-2185
(704) 3764450

I
I Waa ".5RIJUKRuglowl 9
I. SYSTEM DESCRIPTION
11. MATERIAL SPECIFICATION
III .DRAWINGS AND DETAILS

OXIDATION DITCH
The Mass Transfer Systems, Inc. Jet Aeration System is designed to provide
oxygen transfer and mixing for the specified application described in the
following design parameters located in this section.
The aeration equipment supplied for each oxidation ditch consists of three
(3) MT2JM-30 jet aeration manifolds. Refer to Scope of Supply provided in this
section for additional information about material being supplied by MTS for this
project.
Each jet
aeration manifold system recirculates
the
liquid contents of the
oxidation ditch.
The liquid is recirculated through
each
jet aeration manifold
using a recirculation pump. As the liquid enters the jet aeration manifold it
pressurizes, and is then dispersed into the jet aeration nozzles which consist of a
primary (inner) and secondary (outer) jet nozzle. As the liquid passes through
the primary nozzle it comes in contact with the low pressure air that is passing
through the secondary jet nozzle. The result is a fine bubble stream discharged
horizontally across the bottom of the basin or tank at equally spaced intervals.
This provides oxygen transfer and mixing throughout the oxidation ditches.
Refer to MTS Design Parameters provided in this section for additional design
criteria.

SILER CITY, NORTH CAROLINA
DESIGN PARAMETERS - OXIDATION DITCHES
Process Domestic Wastewater - Oxidation Ditch
Number of B asins
2
Basin Dimensions (ft.)
Overall Length
200
Channel Width
40
S.W.D.
20
Basin Volume (Mil. Gallons)
2.2
Design Flow Rate (m.g.d.)
4.0
Design Influent BODS (mg/1)
350
Design Effluent BODS (mg/1)
5
Design Influent NH3.-N (mg/1)
45
Design Effluent NH3-N (mg/1)
1
lb 02/lb BOD Removed
1.3
lb 02/lb NH3-N Removed
4.6
Alpha
0.70
Beta
0.95
Residual D.O. (mg/1)
2.0
Theta
. 1.024
Temp.(OC)
20
Elevation (ft.)
600
SRT (days)
17
F/M
0.085
Design MLSS Concentration (mg/1)
4000
Influent Alkalinity (mg/1)
105
Stoichiometric Alkalinity Required (mg/1)
321
Net Alkalinity Requirement (mg/1)1
112
1 Assumes 40-50 mg/1 in effluent and denitrification regain

SIZER CITY, NORTH CAROLINA
MTS DESIGN SUMMARY - OXIDATION
DITCHES
Actual Oxygen Required (lbs/d)
10,857
per Basin
21,714
Total
Standard Oxygen Required (lbs/hr)
per Basin
866
Total
1732
MTS let Aerators Required
Basin
3@MT27M-30 Jet Manifolds
per
Total
6@MT2JM-30 let Manifolds
Airflow Required (SCFM)
869/11851
per Aerator
'
2923
per Basin
5846
Total
Approximate Compressor Discharge
Pressure (psig)(2)
9.0
Oxygen Absorption Efficiency M
28.6
Liquid Recirculation Required (gpm)
per Aerator
5490
per Pump
5490
per Basin
16,470
Total Power Required (BHP)
Compressors(3)
315
Pumps (4)
200
Total
515
Oxygen Transfer Efficiency (lbs Std. 02/BHP-hr)
3.4
Power Density (BHP/MG)
117
Horizontal Bulk Fluid Velocity (ft/sec)
1.2
(1) 2 headers @ 869 SCFM, 1 header @ 1185 SCFM
(2) Assumes 1.0 psig loss -compressor inlet to basin edge
(3) Assumes 900F, 600 ft. elevation
(4) Assumes 2 ft. losses from pump suction to aerator, 75% efficiency
W

PE OF SUPPLY
Wedge style anchor studs required for installation of all pipe support
brackets supplied by MTS are included in MTS Scope of Supply.
OXIDATION DITCHES
ITEM
QUANTITY
DESCRIPTION
1
6
MT2TM-30 Jet aeration manifold - 150# style
flanged connections
2
6
8" air supply riser pipe with 150# style
plain ends for field wraps
3
6
6" air supply riser pipe with 150# style
plain ends for field wraps
4
4
8" horizontal air pipe one end flanged, one
end plain for field wraps
5
4
6" horizontal air pipe one end flanged, one
end plain for field wraps
6
18
16" pipe support bracket with field installed
style base plate and rubber clamp liner
(18" length)
7
24
12" pipe support bracket with field installed
style base plate and rubber clamp liner
(18" length)
8
16
8" pipe support bracket with field installed
style base plate and rubber clamp liner
(length 8")
9
16
6" pipe support bracket with field installed
style base plate and rubber clamp liner
(length 18")
-
All necessary gaskets and hardware required to assemble jet aeration
equipment will be included in MTS Scope of Supply. Hardware and gaskets
required to
assemble flange connections at equipment interface are
specifically
excluded.
Wedge style anchor studs required for installation of all pipe support
brackets supplied by MTS are included in MTS Scope of Supply.

II MATERIAL SPECIFICATION
OXIDATION DITCHES
JET AERATION MANIFOLDS
The jet aeration manifolds will be fabricated from machine filament wound
fiberglass reinforced plastic (FRP) using an isophthalic resin. Units will be
fabricated in accordance with ANSI/ASTM Specification D-2996-088 and the
National Bureau of Standards .Specification PS 15-69.
Each jet aeration nozzle consists of an inner (liquid) nozzle and an outer
(air/liquid) nozzle. Each nozzle will be fabricated in accordance with the National
Bureau of Standards Specification PS 15-69. Each jet nozzle will have a nexus liner
for added abrasion protection.
AIR PIPING
All air supply piping will be fabricated- from machine filament wound fiberglass
reinforced plastic (FRP) using an isophthalic resin. Units will be fabricated in
accordance with ANSI/ASTM Specification D-2996-088 and the National Bureau, of
Standards Specification PS 15-69.
PIPE SUPPORT BRACKETS
All pipe support brackets will be constructed from Type 304 stainless steel. All
welds will be continuous full penetration welds. All sharp edges and burrs will be
removed. Pipe support brackets will require field installation of support base
plates. This will provide field adjustment to insure good alignment.
GASKET MATERIAL
All gasket material and pipe. support clamp liners will be 1/8" thick Neoprene
rubber. Gasket material will be field installed between all flange connections and
pipe support bracket pipe clamps.
HARDWARE
- All cap screws, hex nuts, lock washers and flat washers supplied by MTS will be
Type 304 stainless steel conforming to ASTM A193 Grade B8 and/or AISI 304
specifications. All cap screw heads and hex nuts will be standard finish type,
ANCHORSTUDS
All anchor studs supplied by MTS will be (wedge style) Type 304 stainless steel
conforming to GSA specification FFS-325 2.4.1 and are tested in accordance with
ASTM E488 specifications. See installation data 'sheet provided in this section for
further, details.

Siler City WWTP Current Conditions
BioWin user and configuration data
Project details
Project name: Siler City Oxidation Ditch Project ref.: 16.04035
Plant name: Siler City WWTP User name: David Honeycutt
Saved: 11/29/2016
Steady state solution
SRT: 158.11 days
Temperature: 15.0°C
Flowsheet
BOD Influent
4 -_
Lime Addition
Reactor1 Reactor2
Reactorl0
Reactor9
Wit{
Alum Addition
Clarifier
RAS
WAS
Waste Sludge
ReactoO Reactor4 Reactor5
Reactor6 Reactor? Reactor6
Effluent
Configuration information for all Bioreactor units
4
File Z.\Voll\Projects\2016\16.04035-Siler City WastewaterTreatability Evaluation\Misc\Siler City WWTP\Oxidation Ditch ModelS.l model clarifier -Current Conditlons.bwc 1

Physical data
Element name
Volume [Mil. Gal]
Area [ft2]
Depth [ft]
Reactor 1
0.4380
3194.3310
18.330
Reactor
0.3800
2771.3374
18.330
Reactor
0.3800
2771.3374
18.330
Reactor 4
0.3800
2771.3374
18.330
Reactor 5
0.4380
3194.3310
18.330
Reactor 6
0.4380
3194.3310
18.330
Reactor
0.3800
2771.3374
18.330
Reactor
0.3800
2771.3374
18.330
Reactor
0.3800
2771.3374
18.330
Reactor 10
0.4380
3194.3310
18.330
Operating data Average (flowltime weighted as required)
Element name
Average Air flow rate [ft3/min (20C, 1 atm)]
Reactor 2
118.0
Reactor 7
325.0
Reactor 1
118.0
Reactor 10
118.0
Reactor 5
325.0
Reactor 6
325.0
Configuration information for all BOD Influent units
Operating data Average (flowltime weighted as required)
Element name
BOD Influent
1.87
Flow
Total Carbonaceous BOD mgBOD/L
136.00
Volatile suspended solids mg/L
140.00
File Z:\Voll\Projects\2016\16.04035 -Siler City Wastewater Treatability Evaluation\Misc\Siler City WWiP\Oxldation Ditch Model5.1 model clarifier -Current Conditions.bwc 2

Total suspended solids mg/L
186.50
Total Kjeldahl Nitrogen mgN/L
25.97
Total P mgP/L
3.08
Nitrate N mgN/L
0
pH
7.30
14.000
10
Alkalinity mmol/L
2.00
Calcium mg/L
80.00
Magnesium mg/L
15.00
Dissolved 02 mg/L
0
Configuration information for all Model clarifier units
Physical data
Element name
Volume[Mil. Gal]
Area[ft2]
Depth[ft]
Number of layers
Top feed layer
Feed Layers
Clarifier
1.3321
1.272E+4
14.000
10
6
1
Operating data Average (flow/time weighted as required)
Element name Split method Average Split specification
Clarifier Ratio 2.00
Element name Average Temperature Reactive
Clarifier Uses global setting No
Configuration information for all Metal addition units
Operating data Average (flow/time weighted as required)
File Z:\Voll\Projects\2016\16.04035-Siler City Wastewater Treatability Evaluation\Misc\Siler City WWrP\Oxidation Ditch Model5.1 model clarifier -Current Condltlons.bwc 3

Element name
Alum Addition
Metal mg/L
57700.10
Other Cations (strong bases) meq/L
5.00
Other Anions (strong acids) meq/L
6434.90
Total CO2 mmoUL
7.00
Flow (gpd)
50
Configuration information for all Splitter units
Operating data Average (flowltime weighted as required)
Element name Splif method Average Split specification
spside Flowrate [Main] 930
WAS splitter Flowrate [Side] 0.017
Configuration information for Lime Feed
Operating data Average (flowltime weighted as required)
Element name
Lime Addition
Calcium mg/L
120000.00
Flow(gpd)
1500
File Z:\Voll\Projects\2016\16.04035 -Siler City Wastewater Treatability Evaluation\Misc\Siler City WWTP\Oxidation Ditch Model5.1 model clarifier -Current Conditions.bwc 4

BioWin Album
REACTOR PARAMETERS SUMMARY
File Z:\Voll\Projects\2016\16.04035 -Slier City Wastewater Treatability Evaluation\Misc\Siler City WWTP\Oxidation Ditch Model5.1 model clarifier -Current Conditlons.bwc 5
Element
Ammoni
Nitrate N
Total P
Dissolve
Volatile
Total
Flow
OTE [%]
SOTE
Air flow
S
a N
[mgN/L]
[mgP/L]
d 02
suspend
suspend
[mgd]
[%]
rate
[mgN/L]
[mg/L]
ed solids
ed solids
[ff3/min
[mg/L]
[mg/L]
(20C, 1
atm)]
Reactor
0.29
11.13
219.36
1.96
2926.74
7063.15
935.56
13.33
28.33
118.00
1
Reactor
0.29
11.13
219.36
1.95
2926.73
7063.13
935.56
13.34
28.33
118.00
2
Reactor
0.28
11.13
219.36
1.90
2926.71
7063.11
935.56
100.00
100.00
0
3
Reactor
0.28
11.13
219.36
1.85
2926.69
7063.09
935.56
100.00
100.00
0
4
Reactor
0.28
11.14
219.36
1.92
2926.67
7063.07
935.56
13.38
28.33
325.00
5
Reactor
0.27
11.14
219.36
2.00
2926.65
7063.05
935.56
13.26
28.33
325.00
6
Reactor
0.27
11.14
219.36
2.09
2926.63
7063.03
935.56
13.12
28.33
325.00
7
Reactor
0.27
11.14
219.36
2.03
2926.61
7063.01
935.56
100.00
100.00
0
8
Reactor
0.26
11.15
219.36
1.98
2926.59
7063.00
935.56
100.00
100.00
0
9
Reactor
0.26
11.15
219.36
1.97
2926.57
7062.97
935.56
13.30
28.33
118.00
10
Effluent
0.26
11.15
0.09
1.97
1.06
2.55
1.85
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File Z:\Voll\Projects\2016\16.04035 -Slier City Wastewater Treatability Evaluation\Misc\Siler City WWTP\Oxidation Ditch Model5.1 model clarifier -Current Conditlons.bwc 5

Siler City WWTP with Proposed Mountaire Farms
Process Wastewater
BioWin User and Configuration data
Project details
Project name: Siler City Oxidation Ditch Project ref.: 16.04035
Plant name: Siler City WWTP User name: David Honeycutt
Saved: 11/29/2016
Steady state solution
SRT: 48.85 days
Temperature: 10.0°C
Flowsheet
BOD Influent
Reactor/ Reactor2
Reactor3 Reactor4
Reactors
ar
Lime Feed
d
Reactor10 Reactor
Reactor Reactor7
Reactor
7Ltl•iy}Cn�
.*.Y
�°d.G
Alum Feed
Clarifier Effluent
RAS
WAS Waste Sludge
i
Configuration information for all Bioreactor units
Physical data
File Z.\Voll\Projects\2016\16.04035 -Siler City Wastewater Treatability Evaluation\M1sc\Si1er City WWTP\Oxidation Ditch Mode15.1 model clarifier -with Mountaire.bwc 1

Element name
Volume [Mil. Gal]
Area [ft2]
'Depth [ft]
Reactor 1
0.4380
3194.3310
18.330
Reactor 2
0.3800
2771.3374
18.330
Reactor 3
0.3800
2771.3374
18.330
Reactor 4
0.3800
2771.3374
18.330
Reactor
0.4380
3194.3310
18.330
Reactor
0.4380
3194.3310
18.330
Reactor
0.3800
2771.3374
18.330
Reactor
0.3800
2771.3374
18.330
Reactor
0.3800
2771.3374
18.330
Reactor 10
0.4380
3194.3310
18.330
Operating data Average (flow/time
weighted as required)
Element name
Average Air flow rate [ft3/min (20C, 1 atm)]
Reactor 1
249.0
Reactor 2
249.0
Reactor 5
684.0
Reactor 6
684.0
Reactor 7
684.0
Reactor 10
249.0
Total
2799
Configuration information for all BOD Influent units
Operating data Average
Element name BOD Influent
Flow 2.57
Total Carbonaceous BOD mgBOD/L 221.50
Volatile suspended solids mg/L 140.00
Total suspended solids mg/L 176.60
D
File Z:\Voll\Projects\2016\16.04035 -Siler City Wastewater Treatability Evaluation\Misc\Siler City WWTP\Oxidation Ditch ModelS.1 model clarifier -with Mountaire.bwc 2

Total Kjeldahl Nitrogen mgN/L • 52.90
Total P mgP/L
3.10
Nitrate N mgN/L
0
pH
7.30
Alkalinity mmol/L
2.00
Calcium mg/L
80.00
Magnesium mg/L
15.00
Dissolved 02 mg/L
0
Configuration information for all Model clarifier units
Physical data
Operating data Average (flow/time weighted as required)
Element name Split method Average Split specification
Clarifier Ratio 1.50
Element name- Average Temperature Reactive
Clarifier Uses global setting No
Configuration information for all Splitter units
Operating data Average (flow/time weighted as required)
Element name Split method Average Split specification
spside Flowrate [Main] 930
File Z:\Voll\Projects\2016\16.04035- Siler City Wastewater Treatability Evaluation\Misc\Siler City WW7P\0xidation Ditch ModelS.1 model clarifier -with Mountaire.bwc 3
Element name
Volume[Mil. Gal]
Area[ft2]
Depth[ft]
Number of layers
Top feed layer
Feed Layers
Clarifier
1.3321
1.272E+4
14.000
10
6
1
Operating data Average (flow/time weighted as required)
Element name Split method Average Split specification
Clarifier Ratio 1.50
Element name- Average Temperature Reactive
Clarifier Uses global setting No
Configuration information for all Splitter units
Operating data Average (flow/time weighted as required)
Element name Split method Average Split specification
spside Flowrate [Main] 930
File Z:\Voll\Projects\2016\16.04035- Siler City Wastewater Treatability Evaluation\Misc\Siler City WW7P\0xidation Ditch ModelS.1 model clarifier -with Mountaire.bwc 3

WAS splitter Flowrate [Side] 0.0495
Configuration information for Lime Feed
Operating data Average (flow/time weighted as required)
Element name
Lime Feed
Calcium mg/L
120000.00
Flow (mgd)
0.004
REACTOR PARAMETERS SUMMARY
Element
Ammonia
Nitrate N
Total P
Dissolved
Volatile
Total
Flow
OTE
SOTE
Air flow
s
N
[mgN/L]
[mgP/L]
02 [mg/L]
suspend
suspended [mgd]
[%]
j%]
rate
[mgN/L]
ed solids
solids
[U/min
[mg/Ll
[mg/L1
(20C, 1
atm)]
Reactor
0.48
27.61
93.87
1.69
2463.
4010.66
936.31
13.69
28.33
249.00
1
83
Reactor
0.47
27.61
93.87
1.68
2463.
4010.65
936.31
13.70
28.33
249.00
2
82
Reactor
0.46
27.62
93.87
1.57
2463.
4010.64
936.31
100.00
100.00
0
3
81
Reactor
0.45
27.63
93.87
1.45
2463.
4010.63
936.31
100.00
100.00
0
4
80
Reactor
0.44
27.63
93.87
1.62
2463.
4010.61
936.31
13.79
28.33
684.00
5
78
Reactor
0.43
27.64
93.87•
1.79
2463.
4010.59
936.31
13.55
28.33
684.00
6
76
Reactor
0.42
27.65
93.87
1.97
2463.
4010.57
936.31
13.30
28.33
684.00
7
74
Reactor
0.41
27.66
93.87
1.85
2463.
4010.56
936.31
100.00
100.00
0
8
72
Reactor
0.40
27.67
93.87
1.74
2463.
4010.54
936.31
100.00
100.00
0
9
70
Reactor
0.40
27.67
93.87
1.72
2463.
4010.51
936.31 !
13.64
28.33
249.00
10
67
Effluent
0.40
27.67
0.09
1.72
2.03
3.30
2.52
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File Z.\Voll\Projects\2016\16.04035 -Siler City Wastewater Treatability Evaluation\Misc\Siler City WWTP\Oxidation Ditch ModelS.l model clarifier -with Mountaire.bwc 4