NC0021628_Application (ATC)_20191030

Request for Authorization to Construct Submittal
Wastewater Facilities
Contract 1.0 — Norwood WWTP Renovation
Project No. E-SRP-W-18-0167
NORWGOD
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E N G I N E E R S
October 28, 2019
North Carolina Department of Environmental Quality
Division of Water Resources
NPDES Complex Permitting Unit
512 N. Salisbury Street, 9th Floor
Raleigh, North Carolina 27604
Subject: Town of Norwood
Contract 1.0 — Norwood WWTP Renovation
NPDES Permit No. NC0021628
Request for Authorization to Construct
Gentlemen:
1996.002 (34)
The Town of Norwood is planning to modify its existing Norwood Wastewater Treatment Plant. In
general, the project consists of construction of a new headworks facility containing a rotary drum
screen and a grit removal system, a parshall flume, aeration basin weirs, two 50-foot secondary
clarifers, a sludge pump station, a drain pump station, and a new chlorine contact chamber. The
existing headworks, clarifiers, RAS/WAS pump station, and chlorine contact basin will be
demolished. Construction is anticipated to begin in mid 2020 and is expected to be completed within
18 months.
On behalf of the Town, we respectfully request an Authorization to Construct. Enclosed please find
one set, along with a CD containing the following documents, for your review:
• Original executed Application for Authorization to Construct (Form ATC-12-14)
• NPDES Permit No. NC0021628
• Special Order by Consent
• Engineering Plans
• Engineering Specifications
• Engineering Calculations
Should you have any questions or need additional information, please feel free to call me at
704.338.4668 or email me at [e-mail].
Yours very truly,
WILLI N INE S
Charles A. Wi lis Jr., P.E., BCEE
Enclosures
cc: Town of Norwood
10700 Sikes Place, Suite 115
Charlotte, North Carolina 28277
704.377.9844/ NC License F-0114

State of North Carolina
;" Department of Environmental Quality , a
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
SECTION 1: INSTRUCTIONS AND INFORMATION
A. The Division of Water Resources will accept this application package for review only if all of the items are provided and the
application is complete. Failure to submit all of the required items will result in the application package being returned as incomplete
per 15A NCAC 02T .0105(b).
B. Plans and specifications must be prepared in accordance with 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General Statute
133-3, North Carolina General Statute 143-215.1, and Division of Water Resources Minimum Design Criteria for NPDES
Wastewater Treatment Facilities.
C. The plans and specifications submitted must represent a completed final design that is ready to advertise for bid.
D. Any content changes made to this Form ATC-12-14 shall result in the application package being returned.
E. The Applicant shall submit ONE ORIGINAL and ONE DIGITAL COPY (CD) of the application, all supporting documentation and
attachments. All information must be submitted bound or in a 3-ring binder, with a Section tab for each Section, except the
Engineering Plans.
F. Check the boxes below to indicate that the information is provided and the requirements are met.
G. If attachments are necessary for clarity or due to space limitations, such attachments are considered part of the application
package and must be numbered to correspond to the item referenced.
H. For any project that requires review under the State Environmental Policy Act (SEPA), an Authorization to Construct cannot be
issued prior to the completion of a State Clearinghouse advertisement period for a FONSI, EIS, etc. unless the project qualifies for
a Determination of Minor Construction Activity.
I. For more information, visit the Division of Water Resources web site at: https://deg.nc.gov/about/divisions/water-resources/water-
resources-permits/wastewater-branch/npdes-wastewater/authorization-to-construct.
J. In addition to this Authorization to Construct, the Applicant should be aware that other permits may be required from other Sections
of the Division of Water Resources (for example: reclaimed water facilities permits; Class A or B biosolids residuals permit).
SECTION 2: APPLICANT INFORMATION AND PROJECT DESCRIPTION
A. APPLICANT
Applicant's name
Town of Norwood
Signature authority's name per 15A NCAC 02T .0106(b)
Scott Howard
Signature authority's title
Town Administrator
Complete mailing address
212 South Main Street, Norwood, North Carolina 28128
Telephone number
704.474.3416
Email address
[e-mail]
B. PROFESSIONAL ENGINEER
Professional Engineer's name
Charles A. Willis Jr., P.E., BCEE
Professional Engineer's title
President
North Carolina Professional Engineer's License No.
17710
Firm name
Willis Engineers
Firm License number
F-0114
Complete mailing address
10700 Sikes Place, Suite 115, Charlotte, NC, 28277
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 1

Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
Telephone number 704.377.9844
Email address [e-mail]
C. NPDES PERMIT
NPDES Permit number
NCO021628
Current Permitted flow (MGD) — include permit
0.75
flow phases if applicable
D. PROJECT DESCRIPTION
Provide a brief description of the project: The project consists of construction of a new headworks facility containing a rotary
drum screen and a grit removal system. Additionally, the project will add a parshall flume, aeration basin weirs, two 50-foot
secondary clarifers, a sludge pump station, a drain pump station, and a new chlorine contact chamber.
SECTION 3: APPLICATION ITEMS REQUIRED FOR SUBMITTAL FOR ALL PROJECTS
A. Cover Letter
® The letter must include a request for the Authorization to Construct; the facility NPDES Number; a brief project description
that indicates whether the project is a new facility, facility modification, treatment process modification, or facility expansion;
the construction timeline; and a list of all items and attachments included in the application package.
❑ If any of the requirements of 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General Statute 133-31 North Carolina
General Statute 143-215.1, and Division of Water Resources Minimum Design Criteria for NPDES Wastewater Treatment
Facilities are not met by the proposed design, the letter must include an itemized list of the requirements that are not met.
B. NPDES Permit
® Submit Part I of the Final NPDES permit for this facility that includes Part A (Effluent Limitations and Monitoring Requirements)
for the monthly average flow limit that corresponds to the work that is requested for this project.
C. Special Order by Consent
® If the facility is subject to any Special Orders by Consent (SOC), submit the applicable SOC.
❑ Not Applicable.
D. Finding of No Significant Impact or Record of Decision
❑ Submit a copy of the Finding of No Significant Impact or Record of Decision for this project.
❑ Provide a brief description of any of the mitigating factors or activities included in the approved Environmental Document
that impact any aspect of design of this project, if not specified in the Finding of No Significant Impact or Record of Decision.
® Not Applicable.
E. Engineering Plans
® Per 15A NCAC 02T .0504(c)(1), submit one set of detailed plans that have been signed, sealed and dated by a North Carolina
Licensed Professional Engineer.
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 2

State of North Carolina
;' Department of Environmental Quality
Division of Water Resources , a
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
® Per 21 NCAC 56 .1103(a)(6), the name, address and License number of the Licensee's firm shall be included on each sheet of
the engineering drawings.
® Plans must be labeled as follows: FINAL DRAWING — FOR REVIEW PURPOSES ONLY — NOT RELEASED FOR CONSTRUCTION.
® 15A NCAC 02H .0124 requires multiple (dual at a minimum) components such as pumps, chemical feed systems, aeration
equipment and disinfection equipment. Is this requirement met by the design? ® Yes or ❑ No. If no, provide an
explanation:
Plans shall include:
® Plans for all applicable disciplines needed for bidding and construction of the proposed project (check as appropriate):
® Civil ❑ Not Applicable
® Process Mechanical ❑ Not Applicable
® Structural ❑ Not Applicable
® Electrical ❑ Not Applicable
® Instrumentation/Controls ❑ Not Applicable
❑ Architectural ® Not Applicable
❑ Building Mechanical M Not Applicable
❑ Building Plumbing ® Not Applicable
® Plan and profile views and associated details of all modified treatment units including piping, valves, and equipment (pumps,
blowers, mixers, diffusers, etc.)
® Are any modifications proposed that impact the hydraulic profile of the treatment facility? ® Yes or ❑ No. If yes, provide
a hydraulic profile drawing on one sheet that includes all impacted upstream and downstream units. The profile shall include
the top of wall elevations of each impacted treatment unit and the water surface elevations within each impacted treatment
unit for two flow conditions: (1) the NPDES permitted flow with all trains in service and (2) the peak hourly flow with one
treatment train removed from service.
® Are any modifications proposed that impact the process flow diagram or process flow schematic of the treatment facility?
® Yes or ❑ No. If yes, provide the process flow diagram or process flow schematic showing all modified flow paths including
aeration, recycle/return, wasting, and chemical feed, with the location of all monitoring and control instruments noted.
F. ® Engineering Specifications
® Per 15A NCAC 02T .0504(c)(2), submit one set of specifications that have been signed, sealed and dated by a North Carolina
Licensed Professional Engineer.
® Specifications must be labeled as follows: FINAL SPECIFICATIONS — FOR REVIEW PURPOSES ONLY — NOT RELEASED FOR
CONSTRUCTION.
Specifications shall include:
® Specifications for all applicable disciplines needed for bidding and construction of the proposed project (check as
appropriate):
® Civil ❑ Not Applicable
® Process Mechanical ❑ Not Applicable
® Structural ❑ Not Applicable
® Electrical ❑ Not Applicable
® Instrumentation/Controls ❑ Not Applicable
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 3

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
❑ Architectural ® Not Applicable
❑ Building Mechanical ® Not Applicable
❑ Building Plumbing ® Not Applicable
® Detailed specifications for all treatment units and processes including piping, valves, equipment (pumps, blowers, mixers,
diffusers, etc.), and instrumentation.
® Means of ensuring quality and integrity of the finished product including leakage testing requirements for structures and
pipelines, and performance testing requirements for equipment.
® Bid Form for publicly bid projects.
G. Construction Sequence Plan
® Construction Sequence Plan such that construction activities will not result in overflows or bypasses to waters of the State.
The Plan must not imply that the Contractor is responsible for operation of treatment facilities. List the location of the
Construction Sequence Plan as in the Engineering Plans or in the Engineering Specifications or in both: _
H. Engineering Calculations
® Per 15A NCAC 02T .0504(c)(3), submit one set of engineering calculations that have been signed, sealed and dated by a North
Carolina Licensed Professional Engineer; the seal, signature and date shall be placed on the cover sheet of the calculations.
For new or expanding facilities and for treatment process modifications that are included in Section 4.C, the calculations shall
include at a minimum:
® Demonstration of how peak hour design flow was determined with a justification of the selected peaking factor.
® Influent pollutant loading demonstrating how the design influent characteristics in Section 4.6.2 of this form were
determined.
® Pollutant loading for each treatment unit demonstrating how the design effluent concentrations in Section 4.13.2 of this form
were determined.
® Hydraulic loading for each treatment unit.
® Sizing criteria for each treatment unit and associated equipment (blowers, mixers, pumps, etc.)
® Total dynamic head (TDH) calculations and system curve analysis for each pump specified that is included in Section 4.C.6.
® Buoyancy calculations for all below grade structures.
® Supporting documentation that the specified auxiliary power source is capable of powering all essential treatment units.
I. Permits
® Provide the following information for each permit and/or certification required for this project:
Permit/Certification
Not
Applicable
Date
Submitted
Date
Approved
Permit/
Certification
Number
If Not Issued Provide
Status and Expected
Issuance Date
Dam Safety
X
Soil Erosion and Sediment Control
February 2020
USCOE / Section 404 Permit
X
Water Quality Certification (401)
X
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 4

J.
Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
USCOE / Section 10
X
Stormwater Management Plan
X
CAMA
X
NCDOT Encroachment Agreement
X
Railroad Encroachment Agreement
X
Other:
Residuals Management Plan
❑ For all new facilities, expanding facilities, or modifications that result in a change to sludge production and/or sludge
processes, provide a Residuals Management Plan meeting the requirements of 15A NCAC 02T .0504(j) and 15A NCAC 02T
.0508; the Plan must include:
❑ A detailed explanation as to how the generated residuals (including trash, sediment and grit) will be collected, handled,
processed, stored, treated, and disposed.
❑ An evaluation of the treatment facility's residuals storage requirements based upon the maximum anticipated residuals
production rate and ability to remove residuals.
❑ A permit for residuals utilization or a written commitment to the Applicant from a Permittee of a Department approved
residuals disposal/utilization program that has adequate permitted capacity to accept the residuals or has submitted a
residuals/utilization program application.
❑ If oil, grease, grit or screenings removal and collection is a designated unit process, a detailed explanation as to how the
oil/grease will be collected, handled, processed, stored and disposed.
❑ Not Applicable.
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 5

State of North Carolina
,a Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
SECTION 4: PROJECT INFORMATION
A. WASTEWATER TREATMENT PLANT FLOW INFORMATION —COMPLETE FOR NEW OR EXPANDING FACILITIES
1. Provide the following flow information:
Plant Flows
Existing Plant Design
0.75 MGD
Current NPDES Permit Limit
0.75 MGD
Current Annual Average
(past 12 months)
0.52 MGD
For Past 12 Months:
Start Date: 08/18
End Date:08/19
For Past 24 Months:
Start Date: 08/17
End Date:08/19
Maximum Month
0.864 MGD
0.415 MGD
Maximum Day
1.892 MGD
1.892 MGD
Peak Hour
N/A
N/A
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 6

State of North Carolina
K, Ira Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
B. WASTEWATER TREATMENT FACILITY DESIGN INFORMATION —COMPLETE FOR NEW OR EXPANDING FACILITIES AND
FOR TREATMENT PROCESS MODIFICATIONS
1. Have all of the requirements of 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina General Statute 133-31 North Carolina
General Statute 143-215.11 and Division of Water Resources Minimum Design Criteria for NPDES Wastewater Treatment
Facilities been met by the proposed design and specifications? ® Yes or ❑ No. If no, provide justification as to why the
requirements are not met, consistent with 15A NCAC 02T .0105(n):
2. Provide the design influent and effluent characteristics that are used as the basis for the project design, and the NPDES
permit limits for the following parameters:
Project Basis of Design
Design Influent
Design Influent
Influent
Concentration
Load
Concentration -
(Must be
(Must be
Current Annual
supported by
supported by
Design Effluent
Average (past
Engineering
Engineering
Concentration and/or
NPDES Permit Limits
12 months) if
Calculations
Calculations
Load
(monthly average)
Parameter
Available
[Section 3.H])
[Section 3.H])
Ammonia Nitrogen
mg/L Summer
mg/L Summer
(NH3-N)
N/A
N/A
N/A
mg/L Winter
mg/L Winter
Biochemical
5.0 mg/L Summer
30 mg/L Summer
Oxygen Demand
118 mg/L
250 mg/L
1,563 lb/day
(BODS)
10.0 mg/L Winter
30 mg/L Winter
Fecal Coliform
per 100 mL
per 100 mL
Nitrate + Nitrite
Nitrogen (NO3-N +
mg/L
mg/L
N 02-N )
Total Kjeldahl
N/A
Nitrogen
mg/L
mg/L
Total Nitrogen
lb/year
lb/year
mg/L
mg/L
Total Phosphorus
N/A
N/A
N/A
lb/year
lb/year
Total Suspended
184 mg/L
250 mg/L
1,563 Ib/day
10 mg/L
30 mg/L
Solids (TSS)
3. Based on the "Project Basis of Design" parameters listed above, will the proposed design allow the treatment facility to
meet the NPDES Permit Limits listed above? ® Yes or ❑ No. If no, describe how and why the Permit Limits will not be
met:
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 7

Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
4. Per 15A NCAC 02T .0505(]), by-pass and overflow lines are prohibited. Is this condition met by the design? ® Yes or ❑ No
If no, describe the treatment units bypassed, why this is necessary, and where the bypass discharges:
5. Per 15A NCAC 02T .0505(k), multiple pumps shall be provided wherever pumps are used. Is this condition met by the
design? ® Yes or ❑ No. If no, provide an explanation:
6. Per 15A NCAC 02T .0505(I), power reliability shall be provided consisting of automatically activated standby power supply
onsite capable of powering all essential treatment units under design conditions, or dual power supply shall be provided
per 15A NCAC 02H. 0124(2)(a). Is this condition met by the design? ® Yes or ❑ No. If no, provide (as an attachment
to this Application) written approval from the Director that the facility:
➢ Has a private water supply that automatically shuts off during power failures and does not contain elevated water
storage tanks, and
➢ Has sufficient storage capacity that no potential for overflow exists, and
➢ Can tolerate septic wastewater due to prolonged detention.
Per 15A NCAC 02T .0505(o), a minimum of 30 days of residual storage shall be provided. Is this condition met by the
design? ❑ Yes or ® No. If no, explain the alternative design criteria proposed for this project in accordance 15A NCAC
02T .105(n): See attached Residual Management Plan.
8. Per 15A NCAC 02T .0505(gi, the public shall be prohibited from access to the wastewater treatment facilities. Explain how
the design complies with this requirement: The WWTP property is enclosed in a locked barbed wire fence.
9. Is the treatment facility located within the 100-year flood plain? ❑ Yes or ® No. If yes, describe how the facility is
protected from the 100-year flood:
C. WASTEWATER TREATMENT UNIT AND MECHANICAL EQUIPMENT INFORMATION —COMPLETE FOR NEW OR
EXPANDING FACILITIES AND FOR MODIFIED TREATMENT UNITS
1. PRELIMINARY AND PRIMARY TREATMENT (i.e., physical removal operations and flow equalization):
Calculations
Treatment Unit
No. of
Type
Size per Unit
Plan Sheet
SReferencepecification
Provided?
Units
f
Reerence
(Yes or No)
Manual Bar Screen
1
Bar
2.625 MGD at peak hourly flow
M1-M2
462100
No
Mechanical Screen
1
Rotary Drum
2.625 MGD at peak hourly flow
M1-M2
462100
No
Grit Removal
1
In -Line
2.625 MGD at peak hourly flow
M1-M2
46 23 00
No
Flow Equalization
-
gallons
ft diameter; ft side
Primary Clarifier
Circular
water depth
square feet; ft side
Primary Clarifier
Rectangular
water depth
Other
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 8

State of North Carolina
1'T'7
Water Resources
ENVIRONMENTAL QUALITY
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
SECONDARY TREATMENT (BIOLOGICAL REACTORS AND CLARIFIERS) (i.e., biological and chemical processes to remove
organics and nutrients)
No. of
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
(Yes or No)
Aerobic Zones/
Tanks
gallons
Anoxic Zones/
gallons
Tanks
Anaerobic
gallons
Zones/Tanks
Sequencing Batch
--
gallons
Reactor(SBR)
Membrane
-
gallons
Bioreactor (MBR)
Secondary Clarifier
2
Circular
60 ft diameter; 12 ft side
M5-M6
46 43 00
Yes
water depth
Secondary Clarifier
Rectangular
square feet; ft
side water depth
Other
3. TERTIARY TREATMENT
No. of
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
(Yes or No)
Tertiary Clarifier
Circular
ft diameter; ft
side water depth
Tertiary Clarifier
Rectangular
square feet; ft
side water depth
Tertiary Filter
square feet
Tertiary Membrane
square feet
Filtration
Post -Treatment
--
gallons
Flow Equalization
Post -Aeration
gallons
Other
4. DISINFECTION
No. of
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
(Yes or No)
gal/day per bank at
Ultraviolet Light
(Parallel; in
peak hourly flow;number
series)
of banks;
number of lamps/bank
Chlorination
2
Gas (Gas;
gallons of contact
M10
Yes
tablet; liquid)
tank/unit
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 9

Water Resources
ENVIRONMENTAL QUALITY
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
Dechlorination
1
liquid (Gas;
gallons of contact
S6
Yes
tablet; liquid)
tank/unit
M10
S. RESIDUALS TREATMENT
No. of
Plan Sheet
Specification
Calculations
Treatment Unit
Units
Type
Size per Unit
Reference
Reference
Provided?
(Yes or No)
Gravity Thickening
square feet; ft side
Tank
water depth
Mechanical
Thickening/
dry lb/hour
Dewateri ng
Aerobic Digestion
gallons
Anaerobic
gallons
Digestion
Composting
dry lb/hour
Drying
dry lb/hour
Other
6. PUMP SYSTEMS (include influent, intermediate, effluent, major recycles, waste sludge, thickened waste sludge and plant
drain pumps)
Location
No. of
Pumps
purpose
Type
Capacity of
each pump
Plan Sheet
Reference
Specification
Reference
GPM
TDH
Sludge Pump Station
4
Recycle Sludge
Submersible
290
10.8
M7-M9
43 25 13
Sludge Pump Station
2
Waste Sludge/
Clarifier Drain
Submersible
200
200
20
41
M7-M9
43 25 13
Scum Pump Station
2
Scum Pump
Chopper/Recirculator
155
23
M7-M9
43 24 16
Drain Pump Station
2
Plant Drain System
Submersible
200
27
M12
43 25 13
7. MIXERS
Location
No. of
Mixers
Purpose
Type
Power of
eac(hHMP ixer
plan Sheet
Reference
Specification
Reference
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 10

Water Resources
ENVIRONMENTAL QUALITY
8. BLOWERS
State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
Location
No. of
Blowers
purpose
Type
Capacity of
each Blower
(Clo
plan Sheet
Reference
Specification
Reference
Headworks
2
Grit Removal
Positive
Displacement
17
M1-M2
431000
9. ODOR CONTROL
Location
No. of
Units
Purpose
Type
Plan Sheet
Reference
Specification
Reference
D. SETBACKS —COMPLETE FOR NEW WASTEWATER TREATMENT STRUCTURES
The minimum distance for each setback parameter to the wastewater treatment/storage units per 15A NCAC 02T .0506(b)
are as follows:
Minimum Distance
Is Minimum Distance
Required from Nearest
Requirement met by the
Setback Parameter
Treatment/Storage
Design? If "No", identify
Unit
Setback Waivers in Item D.2
Below
Any habitable residence or place of assembly under separate
100 ft
®Yes
No ❑
ownership or not to be maintained as part of the project site
Any private or public water supply source
100 ft
® Yes
❑ No
Surface waters (streams — intermittent and perennial, perennial
50 ft
® Yes
❑ No
waterbodies, and wetlands)
Any well with exception of monitoring wells
100 ft
® Yes
❑ No
Any property line
50 ft
® Yes
❑ No
Have any setback waivers been obtained per 15A NCAC 02T .0506(d)? ❑ Yes or ® No. If yes, have these waivers been
written, notarized and signed by all parties involved and recorded with the County Register of Deeds? ❑ Yes or ❑ No. If
no, provide an explanation:
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 11

State of North Carolina
Department of Environmental Quality
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
SECTION 5: APPLICATION CERTIFICATION BY PROFESSIONAL ENGINEER
Professional Engineer's Certification per 15A NCAC 02T .0105:
I, Charles A. Willis Jr., P.E., BCEE, attest that this application package for an Authorization to Construct
(Typed Name of Professional Engineer)
for the Norwood Wastewater Treatment Plant Renovation
(Facility and Project Name)
was prepared under my direct supervisory control and to the best of my knowledge is accurate, complete and consistent
with the information supplied in the engineering plans, specifications, calculations, and all other supporting
documentation for this project. I further attest that to the best of my knowledge the proposed design has been
prepared in accordance with all applicable regulations and statutes, 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina
General Statute 133-3, North Carolina General Statute 143-215.1. and Division of Water Resources Minimum Desien
Criteria for NPDES Wastewater Treatment Facilities, and this Authorization to Construct Permit Application, except as
provided for and explained in Section 4.6.1 of this Application. I understand that the Division of Water Resources'
issuance of the Authorization to Construct Permit may be based solely upon this Certification and that the Division may
waive the technical review of the plans, specifications, calculations and other supporting documentation provided in this
application package. I further understand that the application package may be subject to a future audit by the Division.
Although certain portions of this submittal package may have been prepared, signed and sealed by other professionals
licensed in North Carolina, inclusion of these materials under my signature and seal signifies that I have reviewed the
materials and have determined that the materials are consistent with the project design.
I understand that in accordance with General Statutes 143-215.6A and 143-215.613, any person who knowingly makes
any false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor,
which may include a fine not to exceed $10,000, as well as civil penalties up to $25,000 per violation.
North Carolina Professional Engineer's seal with written signature placed over or adjacent to the seal and dated:
0����i�t�irrq��,
`gyp ; LESS/O,I;•.'9 �'.
�0
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Application for Authorization to Construct Permit (FORM ATC-12-14) Page 12

State of North Carolina
K? r'.. Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
SECTION 6: APPLICATION CERTIFICATION BY APPLICANT
Applicant's Certification per 15A NCAC 02T .0106(b):
I, Scott Howard attest that this application package for an Authorization to Construct
(Typed Name of Signature Authority and Title)
for the Norwood Wastewater Treatment Plant Renovation
(Facility and Project Name)
has been reviewed by me and is accurate and complete to the best of my knowledge. I also understand that if all
required parts of this application package are not completed and that if all required supporting information and
attachments are not included, this application package will be returned to me as incomplete. I further certify that in
accordance with 15A NCAC 02T .0120(b), the Applicant or any affiliate has not been convicted of environmental crimes,
has not abandoned a wastewater facility without proper closure, does not have an outstanding civil penalty where all
appeals have been abandoned or exhausted, are compliant with any active compliance schedule, and does not have any
overdue annual fees.
I understand that the Division of Water Resources' issuance of the Authorization to Construct Permit may be based
solely upon acceptance of the Licensed Professional Engineer's Certification contained in Section 5, and that the Division
may waive the technical review of the plans, specifications, calculations and other supporting documentation provided
in this application package. I further understand that the application package may be subject to a future audit.
I understand that in accordance with General Statutes 143-215.6A and 143-215.6E any person who knowingly makes
any false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor,
which may includ a fine not to exceed $10,000, as well as civil penalties up to $25,000 per violation.
�: i '{
Signature: Date:
THE COMPLETED APPLICATION AND SUPPORTING INFORMATION SHALL BE SUBMITTED TO:
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES/NPDES
By U.S. Postal Service _ By Courier/Special Delivery:
1617 MAIL SERVICE CENTER 512 N. SALISBURY STREET, 9TH FLOOR
RALEIGH, NORTH CAROLINA 27699-1617 RALEIGH, NORTH CAROLINA 27604
TELEPHONE NUMBER: [phone]
Application for Authorization to Construct Permit (FORM ATC-12-14) Page 13

Permit NCO021628
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
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, the
Town of Norwood
is hereby authorized to discharge wastewater from a facility located at the
Norwood WWTP
6896 U.S. Highway 52 South
Norwood
Stanly County
to receiving waters designated as the Rocky River in the Yadkin -Pee Dee River Basin in accordance
with effluent limitations, monitoring requirements, and other conditions set forth in Parts 1, 11, IIl and
IV hereof
This permit shall become effective February 1, 2014.
This permit and authorization to discharge shall expire at midnight on January 31, 201%
Signed this day January 6, 2014.
Original signed by John E. Hennessy
Thomas A_ Reeder, Director
Division of Water Resources
By Authority of the Environmental Management Commission
Page 1 of 7

Permit NCO021628
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 Norwood is hereby authorized to:
1. Continue to operate an existing 0.75 MGD wastewater treatment facility with the following
components:
• Flow splitter box
• Dual bars screens (one mechanical and one manual)
• Grit chamber
• Parshall flume
• Ultrasonic flow recorder with totalizer
• Dual aeration basins with floating surface aerators
• Dual secondary clarifiers
• Chlorine contact basin with gaseous disinfection facilities
• Dechlorination (sodium bisulfite)
• Two sludge drying beds
• Stand-by power generator
The facility is located at Norwood W WTP off U.S. Highway 52 South near Norwood in Stanly
County.
2. Discharge from said treatment works at the location specified on the attached map into the Rocky
River, which is currently classified C waters in sub -basin 03-07-14 of the Yadkin -Pee Dee River
Basin.
Page 2 of 7

—Fc�w r, c. -C M o r L.sood W WT-P
Permit NCO021628
PART I
A. (I.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of the permit and lasting until expiration, the
PermiUee is authorized to discharge from Outfall 001. Such discharges shall be limited and
monitored' by the Permittee as specified below:
EFFLUENT
LIMITS
MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly
Weekly
Measurement
Sample
Sample
Parameter Code
Average
Average
Fre uenc
Type
Location
Flo`'"
0.75 MGD
Continuous
Recording
1 or E
50050
BOD5'
30.0 mg/1
45.0 mg/l
3/Week
Composite
E,l
C0310
Total Suspended Solids Z
30.0 mg/1
45.0 mg/1
3/Week
Composite
E,1
C0530
Nf13-N
Weekly
Composite
E
C0610
Fecal Coliform (geometric mean)
2001100 ml
400/100 ml
3/Week
Grab
E
C0310
Total Residual Chlorine 3
Daily Maximum 28 wg/L
Weekly
Grab
E
50060
pH
? 6.0 and < 9.0
3/Week
Grab
E
00400
Standard Units
Temperature ° C
3/Week
Grab
E
00010
a
Total Mercury
Monitor & Report
See Footnote 4
Grab
E
71900
Total Nitrogen (NO2 + NO3 + TKN)
Quarterly
Composite
E
C0600
Total Phosphorus
Quarterly
Composite
E
C0665
Chronic Toxicitys
Quarterly
Composite
E
TGP3B
Footnotes:
1. No later than 90 days from the effective date of this permit, begin submitting discharge monitoring
reports electronically using NC D" s eDMR application system. See Special Condition A.(3.).
rK 2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of
the respective influent value (85% removaI).
3. The Permittee shall report all effluent TRC values reported by a NC -certified laboratory [including field -
certified]. Effluent values below 50 Itg/L will be treated as zero for compliance purposes.
4. Mercury must be monitored once during the permit cycle. See Special Condition A. (4.) Effluent Mercury
Analysis.
5. Chronic Toxicity (Ceriodaphnia) P/F at 2.7%; March, June, September, and December; see Special
Condition A.(2.)_
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.
Page 3 of 7

Permit NCO021628
A (2.) CHRONIC TOXICITY PERMIT LIlVIIT (QUARTERLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia
dubia at an effluent concentration of 2.7 %.
The permit holder shall perform at a minimum, quarterl monitoring using test procedures outlined in the "North Carolina
Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or "North Carolina
Phase 11 Chronic Whole Effluent Tonicity Test Procedure' (Revised -February 1998) or subsequent versions. The tests will be
performed during the months of March, .tune, September, and December. Effluent sampling for this testing 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 11 Chronic Whole Effluent Toxicity Test Procedure" (Revised February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration
having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable
impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure regimes, and
further statistical methods are specified in the "North Carolina Phase I1 Chronic Whole Effluent Toxicity Test Procedure"
(Revised -February 1998) 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 TGP313 for the pass/fail results and THP313
for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address:
Environmental Sciences Branch
North Carolina Division of Water Resources
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch 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 chemicaVphysical 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 Branch 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.
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.
Page 4 of 7

Permit NCO021628
A. (3.) 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
L Reporting [Supersedes Section D. (2.) and Section E. (5.) (a)]
Beginning no later than 90 days from the effective date of this permit, the permittee shall begin reporting
discharge monitoring data electronically using the NC DWR's Electronic Discharge Monitoring Report
(eDMR) Internet application.
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 permittec 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: httl2.//portal.nedenr.org/web/wq/admin/bog/ipu/edDir
Page 5 of 7

Permit NCO021628
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. SignatorV Requirements [Supplements Section B. 11. b and supersedes Section B. 11. d
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. (I 1)(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 cDMR system.,
registering for eDMR and obtaining an eDMR user account, please visit the following web page:
htt :// ortal.nedenr.or /web/w /admin/bo /i u/edmr
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:
"I certify, 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 qualifiedpersonnelproperly 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 [Supiplements 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 ].
A. (4.) EFFLUENT MERCURY ANALYSIS
Based on the completion and approval of the N.C. Statewide mercury Total Maximum Daily Load (TMDL), the
permit now requires one mercury analysis, using EPA Method 1631E, which must be completed within the
twelve (12) months prior to the next permit renewal.
Page 6 of 7

•
124
1117,
DISCHARGE LOCATION
'A A V
<)
N
ES'O�
ix` Inc
Town of Norwood
Norwood WWTP
Coun
Stanly Stream Class;
C
Receiving Stream'
Rocky River Sub -Basin.
03-07-14
Latitude,
35' 11' 35" Grid/Quad:
mt. Gilead(W)
Longitude:
80' 06'45" HUC #-.
03040105
Facility
Location
(not to scolel
North NPDES Permit: NCO 21628

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
Harold Thompson, Mayor
Town of Norwood
PO Box 697
Norwood, NC 28128
Dear Mayor Thompson:
NORTH CAROLINA
Environmental Quality
May 3, 2019
Subject: SPECIAL ORDER BY CONSENT (SOC)
EMC SOC WQ S18-011
Norwood WWTP
NPDES No. NCO021628
Stanly County
The Division of Water Resources (DWR) hereby transmits for your records a copy of the signed Special
Order by Consent (SOC or the Order) approved by the Environmental Management Commission (EMC).
The terms and conditions of the Order are now in full effect, including those requiring submittal of written
notice of compliance or non-compliance with any SOC schedule date. To cover water -quality maintenance
costs, SOC fees have been revised to include a $250.00 annual fee, pursuant to North Carolina General
Statute 143-215.3D.
If you have questions, please contact the operations staff at DWR's Mooresville Regional Office at
[phone], or contact me in the central office, Derek Denard [[e-mail]] at
[phone].
Sincerely,
Derek C. Denard, Environmental Specialist
Division of Water Resources, NCDEQ
hc: SOC Files w/attachments
Central Files w/attachments
ec: Town of Norwood Harold Thompson, Mayor [[e-mail]];
Kelly Caudle, Town Clerk/Deputy Finance Officer [[e-mail]]
DWR/MRO Corey Basinger [[e-mail]]; Roberto Scheller [[e-mail]]
Laserfiche
North Carolina Department of Environmental Quality I Division of Water Resources
_ 512 North Salisbury Street 1 1617 Mail Service Center I Raleigh, North Carolina 27699-1617
1111� 919.707.9000

RECElVEQ'DENR/GWR
NORTH CAROLINA
APR 10 2019
Water Resources
Permitting Section
ENVIRONMENTAL MANAGEMENT COMMISSION
COUNTY OF STANLY
IN THE MATTER OF )
NORTH CAROLINA )
NPDES PERMIT NO. NCO021628 )
HELD BY )
TOWN OF NORWOOD )
SPECIAL ORDER BY CONSENT
EMC SOC WQ NO. S18-011
Pursuant to provisions of North Carolina General Statutes (G.S.) 143-215.2 and 143-215.67, this
Special Order by Consent is entered into by Town of Norwood, hereinafter referred to as
the Town, and the North Carolina Environmental Management Commission, an
agency of the State of North Carolina created by G.S. 143B-282, and hereinafter referred to as
the Commission:
1. The Town and the Commission hereby stipulate the following:
a. The Town holds North Carolina NPDES permit number NCO021628 for operation of an
existing wastewater treatment works and for making an outlet therefrom for discharge of
treated wastewater to Rocky River, Class C waters of this State in the Yadkin -Pee Dee
River Basin, but is unable to consistently comply with the final effluent limits for Total
Suspended Solids (TSS), Biochemical Oxygen Demand (BOD) and Fecal Coliform as set
forth in NPDES permit NC0021628. Compliance will require preparation and
implementation of plans and specifications for construction and operation of additional
treatment works and upgrades.
b. Noncompliance with final effluent limits constitutes causing and contributing to pollution
of the waters of the State of North Carolina, and the Town is within the jurisdiction of the
Commission as set forth in G.S. Chapter 143, Article 21.
c. The Town will secure financing for planning, designing, and constructing a new or
improved wastewater treatment and disposal system which, once constructed and
operated, will be sufficient to adequately convey and treat wastewater presently being
discharged, to such an extent that the Town will be able to comply with final effluent
limits.
d. Since this Special Order is by consent, neither party will file a petition for a contested
case or for judicial review concerning its terms.

Town of Norwood WWTP
EMC SOC WQ S18-011
p. 2
2. The Town, desiring to comply with the permit identified in paragraph l (a) above, hereby
agrees to do the following:
a. Undertake the following activities in accordance with the indicated time schedule:
Scheduled Aqt�k
Due Date
Initiate Drawing and Specifications
December 31, 2019
Submit draft Engineering Report
December 31, 2020
Upon receipt of the required DWR permit(s), begin
December 31, 2021
construction
Complete construction of the upgrades to the wastewater
treatment plant and submit a certification of completion
December 31, 2022
(Engineer's Certification) from a professional engineer
verifying that the construction has been completed
Attain compliance with NPDES permit final limits
December 31, 2022
b. The Town will submit quarterly progress reports detailing the work and activities
undertaken and completed on the upgrades to the facility. The reports are to be submitted
as follows: one copy, must be mailed to the Mooresville Regional Supervisor, Division of
Water Resources / Water Quality Regional Operations Section, 610 East Center Avenue,
Suite 301, Mooresville, NC 28115, and one copy must be mailed to the Water Quality
Permitting Section / NPDES, 1617 Mail Service Center Raleigh, NC 27699-1617. The
quarterly reports are due in each respective office no later than the thirtieth (30th) day of
January, April, July, and October for the duration of this Order.
c. The Town will comply with all terms and conditions of the permit except effluent limits
for parameters identified in paragraph 1(a) above. See Attachment A for all current
monitoring requirements and effluent limits, including interim effluent limits applicable
to this Special Order by Consent. The Town may also be required to monitor for other
parameters, as deemed necessary by the Director, in future permits or administrative
letters. During the time in which this Special Order by Consent is effective, the Town
shall comply with the interim effluent limits for Total Suspended Solids (TSS),
Biochemical Oxygen Demand (BOD) and Fecal Coliform as listed in the table below.

Town of Norwood WWTP
EMC SOC WQ S18-011
p. 3
Under this Special Order by Consent, ONLY the parameters listed below have been
modified from the most current NPDES Permit in effect for outfall 001.
Parameters
Units
Permit Limits
Interim Limits
Monthly
Av .
Weekly
Avg.
Monthly
Avg.
Weekly
Avg -
Biochemical Oxygen Demand (BOD)
m 7/L
30.0
45.0
45.0
65.0
Total Suspended Solids JSS1 I
me/L
30.0
45.0
45.0
65.0
Fecal Coliform
#/100 ml
200*
400*
400* 1
800*
*Geometric Mean
d. No later than fourteen (14) calendar days after any date identified for accomplishment of
any activity listed in paragraph 2(a) above, submit to the Director of DWR written notice
of compliance (including the date compliance was achieved along with supporting
documentation if applicable) or noncompliance therewith. In the case of noncompliance,
the notice shall include a statement of the reason(s) for noncompliance, remedial
action(s) taken, and a statement identifying the extent to which subsequent dates or times
for accomplishment of listed activities may be affected.
The Town will continue to operate the wastewater treatment plant as best as possible to
prevent/minimize any adverse impacts to the surface waters.
3. The Town agrees that unless excused under paragraph four (4), The Town will pay the
Director of DWR, by check payable to the North Carolina Department of Environmental
Quality, stipulated penalties according to the following schedule for failure to meet the
deadlines set out in paragraphs 2(a), 2(b), and 2(d).
Violation Description
Stipulated Penalty
Failure to meet a scheduled date
$1,000 per day
Failure to comply with a modified $1,000 for exceeding monthly average (or
+
geometric mean) limit; $500 for exceeding
effluent limit
weekly average or geometric mean limits
Monitoring frequency violations for $100 per omitted value per parameter
modified parameters
Failure to Submit Status Reports $1,000 for the first violation; penalty doubles
with each subsequent assessment for late reports
Failure to achieve compliance with final
$5,000 (single penalty)
effluent limits

Town of Norwood WWTP
EMC SOC WQ S18-011
p. 4
4. The Town and the Commission agree that the stipulated penalties are not due if the Town
satisfies DWR that noncompliance was caused solely by:
a. An act of God;
b. An act of war;
c. An intentional act or omission of a third party, but this defense shall not be available if
the act or omission is that of an employee or agent of the defendant or if the act or
omission occurs in connection with a contractual relationship with the permittee;
d. An extraordinary event beyond the permittee's control. Contractor delays or failure to
obtain funding will not be considered as events beyond the permittee's control; or
e. Any combination of the above causes.
Failure within thirty (30) days of receipt of written demand to pay the penalties, or challenge
them by a contested case petition pursuant to G.S. 15013-23, will be grounds for a collection
action, which the Attorney General is hereby authorized to initiate. The only issue in such an
action will be whether the thirty (30) days has elapsed.
5. Noncompliance with the terms of this Special Order by Consent is subject to enforcement
action in addition to the above stipulations, including injunctive relief pursuant to G.S. 143-
215.6.C.
6. This Special Order by Consent and any terms or conditions contained herein, hereby
supersede any and all previous Special Orders, Enforcement Compliance Schedule Letters,
terms, conditions, and limits contained therein issued in connection with NPDES permit
number NC0021628. In the event of an NPDES permit modification or renewal, any effluent
limit or monitoring requirements contained therein shall supersede those contained in
Attachment A of this Special Order by Consent, except as modified and contained in
paragraph 2(c) above.
7. This Special Order by Consent may be amended provided the Town has made good faith
efforts to secure funding, complete all construction and achieve compliance within the dates
specified.

Town of Norwood W WTP
EMC SOC WQ S18-011
p. 5
8. During the term of this Special Order by Consent, the Town will not be permitted to accept
additional wastewater from any domestic, industrial, or commercial sources without prior
approval from the Mooresville Regional Supervisor and the Water Quality Permitting
Section. The Town shall not exceed a total of 75,000 gallons of additional flow.
9. Failure to meet the scheduled date identified in paragraph 2(a) may terminate this Special
Order by Consent and require the Town to comply with the terms and conditions contained in
the permit identified in paragraph 1(a).
10. The Town, upon signature of this Special Order by Consent, will be expected to comply with
all schedule dates, terms, and conditions of this document.
This Special Order by Consent shall expire on March 31, 2023.
For the Town of Norwood.
Harold Thompson, Mayor
q -.- ra-
Date
For the North Carolina Environmental Management Commission:
l [A-� _
Linda ulpepper, Director
Division of Water Resources
Date
S/3/a°lI

Permit NCO021628
Attachment A
EMC SOC WQ S18-011
PART I
A. (L) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
[15A NCAC 0213.0400 et seq., 0213.0500 et seq.]
Grade III Biological WPCS [15A NCAC 08G.0302]
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is
authorized to discharge from Outfall 001. Such discharges shall be limited and monitored' by the Permittee as
specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Weekly
Measurement
Sample
Sample
eDMR Code
Average
Average
Frequenev
Type
Location
Flow
50050
0.75 MGD
Continuous
Recording
Influent or
Effluent
50
C032
45.0 mg/l*
65.0 mg/1*
3/Week
Composite
InfluentEffluent,
Total Suspended Solids 2
C0530
45.0 mg/l* 65.0 mg/l*
3/Week
Composite
Effluent,
Influent
NH3-N
C0610
Weekly
Composite
Effluent
Fecal Coliform (geometric mean)
31616
400/100 ml*
800/100 ml*
3/Week
Grab
Effluent
Total Residual Chlorine'
50060
Daily Maximum 28 µg/L.
Weekly
Grab
Effluent
pH
> 6.0 and < 9.0
00400
Standard Units
3/Week
Grab
Effluent
Temperature ° C
00010
3/Week
Grab
Effluent
Total Mercury a
COMER
Monitor & Report
See Footnote 4
Grab
Effluent
Total Nitrogen (NO2 + NO3 + TKN)
C0600
Quarterly
Composite
Effluent
Total Phosphorus
C0665
Quarterly
Composite
Effluent
Chronic Toxicity5
TGP3B
Quarterly
Composite
Effluent
*SUC Limits are effective beginning on the effective date of the SOC and lasting until the SOC compliance
date on December 31, 2022. The SOC shall expire on March 31, 2023.
Footnotes:
1. The permittee shall submit discharge monitoring reports electronically using NC DWR's eDMR system. See
Special Condition A.(3.).
2. The monthly average effluent BOD5 and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. The Division shall consider all effluent TRC values reported below 50 µg/1 to be in compliance with the
permit. However, the Permittee shall continue to record and submit all values reported by a North Carolina
certified laboratory (including field certified), even if these values fall below 50 µg/1.
4. Mercury must be monitored once during the permit cycle. See Special Condition A. (4.) Effluent Mercury
Analysis.
5. Chronic Toxicity (Ceriodaphnia) P/F at 2.7%; March, June, September, and December; see Special Condition
A.(2.).
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Design Calculations
Norwood Wastewater Treatment Plant Renovation
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TOWN OF NORWOOD
WATERWATER FACILITIES
CONTRACT 1.0 — NORWOOD WWTP RENOVATION
DESIGN CALCULATIONS
TABLE OF CONTENTS
1 Influent Design Criteria
2 Peaking Factor Calculation
3-6 Basis of Design
6 — 12 Hydraulic Profile
13 —18 RAS System Head Development
19 — 23 WAS System Head Development
27 — 28 Scum Pump System Head Development
29 — 33 Drain Pump System Head Development
34 — 37 Buoyancy Calculations
38 Load Tabulation
Willis Engineers
1996.002 i October 2019

Town of Norwood
Norwood WWTP Renovation
Influent Design Criteria
The influent parameters in the Basis of Design were based on the median value of the 30-day rolling
average of several years of Plant DMR data.
The selected influent design parameters serve as a conservative approach to ensure all selected
equipment will provide sufficient treatment. Below is the table summarizing the design parameters.
Norwood Historical
(mg/1)
Design Selection
(mg/1)
BOD
134
250
TSS
209
250
With a design flow of 0.75 MGD, the design loading was calculated as follows:
Loading = 8.34 x Flow in MGD x Concentration in mg/L
Design Selection
(lbs/day)
BOD
1,563
TSS
1,563
Willis Engineers
1996.002 1 October 2019

Town of Norwood
Norwood WWTP Renovation
Formula:
18+Po.s
Peaking Factor = 4+Po s (Ten States Standards)
Peaking Factor Calculation
Where P = Norwood Population in Thousands, 2.4 (US Census Bureau)
Calculation:
18+2.4o.s
Peaking Factor =
4+2.4 0. s
Peaking Factor = 3.5
Willis Engineers
1996.002 2 October 2019

Town of Norwood Basis of Design
Norwood WWTP Renovation
Design Parameters:
Influent
Average Daily Flow 750,000 gpd
Peak Hourly Flow 2,625,000 gpd
BOD (5-day) 250 mg/I
Total Suspended Solids 250 mg/I
Effluent Limits:
BOD (5 day) Weekly
45 mg/L
Monthly
30 mg/L
Total Suspended Solids Weekly
45 mg/L
Monthly
30 mg/L
Note: Unit processes or equipment shown in red are new.
Process
1 Headworks
Influent Screening
Mechanical Screen
Number of Units
1
Type
Rotary Drum
Spacing
0.25 inches
Drive
2 HP
Accessories
Discharge Chute
Manual Screen
Number of Units
1
Type
Bar Screen
Width
3'-5"
Height
4'-0"
Spacing
1 inch
Grit Collector
Number of Units
1
Type
In -Line
Drive
1 HP
Diffused Air
Capacity
17 SCFM
Drive
2 HP
2 Flow Monitoring
Type Parshall Flume
Throat Size 1 ft
Measurement Ultrasonic Level Transmitter
Willis Engineers
1996.002 3 October 2019

Town of Norwood
Norwood WWTP Renovation
Basis of Design
2 Activated Sludge Process
Project will install new effluent rectangular weir trough and new handrails
Aeration Basins
Number of Units
Volume
Mechanical Aerators
Number of Units
Type
Drive
3 Secondary Clarification
Number
Recycle Ratio
Max Allowable Avg Solid Loading Rate
Max Allowable Peak Solid Loading Rate
Max Allowable Hydraulic Loading
Peak Solid Loading Rate
Hydraulic Loading Rate
Peak Solid Loading Area
Peak Hydraulic Area
Peak Solid Loading Diameter
Hydraulic Loading Diameter
Selected Diameter
Depth
Volume (each)
Mechanism
Drive
4 Pumps
Recycle Pumps
Number
Type
Capacity
Drive Type
Drive Size
Waste Pumps
Number
Type
Capacity
Drive Type
Drive Size
Willis Engineers
1996.002
2 Basins
375,000 gal, Each
2 per Basin
Floating Aerator
15 HP
2 units
1.0
20 Ibs/ft^2/day
35 Ibs/ft^2/day
1000 gpd/ft^2
140,738 Ibs/day
2,626,000 gal/day
4,021 ft^2
2,625 ft^2
50.6 ft
41 ft
50 ft
12 ft
176,154 gallons
Platform Mounted Rake and Scum Collector
1 HP
4 Pumps
Submersible
290 gpm
Variable Frequency Drive
5 HP
2
Submersible
200 gpm
Variable Frequency Drive
5 HP
4 October 2019

Town of Norwood
Norwood WWTP Renovation
Basis of Design
Scum
Number
Type
Capacity
Drive Size
Drain Pumps
Number
Type
Capacity
Drive Size
5 Disinfection
Type
Number of Basins
Disinfection Volume (Total)
Dechlorination
Contact Time at Peak Design Flow
Disinfection
Dechlorination
6 Sludge Treatment
Storage
Volume
Drying
Area
2
Chopper
155 GPM
10 HP
2
Submersible
200 GPM
3 HP
Chlorine Gaseous
2
29,200 gal
Calcium Thiosulfate
16 minutes
>30seconds
Converted Imhoff Tank
112,500 gal
Sludge Drying Bed
4,000 ft2
Willis Engineers
1996.002 5 October 2019

Town of Norwood
Norwood WWTP Renovation
Hydraulic Profile
The hydraulics of the renovated Norwood WWTP were evaluated for two different flow scenarios.
Scenario 1 modeled the facilities during average daily flow (ADF) conditions, assuming a flow rate
of 0.75 MGD, a recycle rate of 1.0 x ADF, and all unit processes in service. Additionally, Scenario 1
assumed all new piping with a C value of C=140.
Scenario 2 evaluated the hydraulics of the facility during a peak flow of 3.5 x 0.75 MGD, which is
2.63 MGD. For Scenario 2, it was assumed that only one of each unit process was in service, and
that the piping was old with a C value of 100.
Design Parameters:
Scenario 1 Scenario 2
Recycle Ratio 1.0 1.0
Unit Processes in Service
Aeration Basins 2 1
Clarifiers 2 1
Chlorine Contact Chambers 2 1
Unit Flow
Average Daily Flow Peak Flow
Million Gallons per Day (MGD) 0.75 2.63
Gallons per Minute (GPM) 521 1,823
Cubic Feet per Second (CFS) 1.16 4.06
Summary
Scenario 1
Scenario 2
Headworks Screen
242.54
ft
243.10 ft
Headworks Effluent Trough (Weir 242.25)
242.46
ft
242.75 ft
Parshall Flume (Crest 239.50)
239.94
ft
240.51 ft
Aeration Basin Weir (Weir 238.15)
238.27
ft
238.49 ft
Splitter Box (Weir 235.50)
235.70
ft
236.04 ft
Secondary Clarifier (Weir 234.00)
234.04
ft
234.12 ft
Chlorine Contact (Weir 231.00)
231.15
ft
231.55 ft
Willis Engineers
1996.002 6 October 2019

Town of Norwood
Hydraulic Profile
Norwood WWTP Renovation
Scenario 1
Scenario 2
Headworks Screen
Total HL*
0.08 ft
0.36 ft
*Screen headloss estimated based on Lake Side Raptor
Fine Screen
Downstream Hydraulic Level
242.46 ft
242.75 ft
Hydraulic Grade
242.54 ft
243.10 ft
Headworks Effluent Trough (Weir 242.25)
Weir Elevation
242.25 ft
242.25 ft
Cw
3.33
3.33
Length
3.50 ft
3.50 ft
H L
0.21 ft
0.50 ft
Hydraulic Grade
242.46 ft
242.75 ft
Piping to MH 4
Length
L
14 ft
14 ft
Inv in
HI
240.6 ft
240.6 ft
Inv out
H2
240.50 ft
240.50 ft
Diameter
D
20 in
20 in
Area
A
2.18 ft^2
2.18 ft^2
Slope
s
0.01 ft/ft
0.01 ft/ft
Roughnes Coeff
n
0.012
0.012
Hydraulic Radius
DH
0.42 ft
0.42 ft
Max Flow
12.8 cfs
12.8 cfs
Max Flow
Q
8,249,912 gpd
8,249,912 gpd
Flow
Qd
750,000 gpd
2,625,000 gpd
Ratio
Qd/Q
0.09
0.32
Design Flow Water Elevation in Pipe (From Table)
0.43 ft
0.72 ft
Hydraulic Grade
241.03 ft
241.32 ft
Willis Engineers
1996.002 7 October 2019

Town of Norwood
Hydraulic Profile
Norwood WWTP Renovation
Scenario 1
Scenario 2
Piping to MH 5
Length
L
60 ft
60 ft
Inv in
H1
239.70 ft
239.70 ft
Inv out
H2
239.6 ft
239.6 ft
Diameter
D
20 in
20 in
Area
A
2.18 ft^2
2.18 ft^2
Slope
s
0.00 ft/ft
0.00 ft/ft
Roughnes Coeff
n
0.012
0.012
Hydraulic Radius
DH
0.42 ft
0.42 ft
Max Flow
6.17 cfs
6.17 cfs
Max Flow
Q
3,985,086 gpd
3,985,086 gpd
Design Flow
Qd
750,000 gpd
2,625,000 gpd
Peak Design Flow
Ratio
Qd/Q
0.19
0.66
Design Flow Water Elevation in Pipe (From Table)
0.58 ft
1.10 ft
Hydraulic Grade
240.28 ft
240.80 ft
Piping to Parshall flume
Length
L
50 ft
50 ft
Inv in
H1
239.20 ft
239.20 ft
Inv out
H2
239.17 ft
239.17 ft
Diameter
D
20 in
20 in
Area
A
2.18 ft^2
2.18 ft^2
Slope
s
0.00 ft/ft
0.00 ft/ft
Roughnes Coeff
n
0.012
0.012
Hydraulic Radius
DH
0.42 ft
0.42 ft
Max Flow
3.90 cfs
3.90 cfs
Max Flow
Q
2,520,390 gpd
2,520,390 gpd
Flow
Qd
750,000 gpd
2,625,000 gpd
Ratio
Qd/Q
0.30
1.04
Design Flow Water Elevation in Pipe (From Table)
0.67 ft
1.43 ft
Hydraulic Grade
239.87 ft
240.63 ft
Willis Engineers
1996.002 8 October 2019

Town of Norwood
Hydraulic Profile
Norwood WWTP Renovation
Scenario 1
Scenario 2
Parshall Flume (Crest 239.50)
Crest Elevation
239.50 ft
239.50 ft
C
4.00
4.00
n
1.52
1.52
Throat Width
1.00 ft
1.00 ft
H L
0.44 ft
1.01 ft
Hydraulic Grade
239.94 ft
240.51 ft
Piping to Aeration Basin
Pipe Length (ft)
118 ft
118 ft
Diameter (in)
20 in
20 in
FK
0.6
0.6
C
140
100
Hf
0.00 ft
0.12 ft
H m
0.00 ft
0.03 ft
Total H L
0.00 ft
0.16 ft
Downstream Hydraulic Level
238.27 ft
238.49 ft
Hydraulic Grade
238.28 ft
238.64 ft
Aeration Basin Weir (Weir 238.15)
Weir Elevation
238.15 ft
238.15 ft
Cw
3.33
3.33
Length
8 ft
8 ft
H L
0.12 ft
0.34 ft
Hydraulic Grade
238.27 ft
238.49 ft
Willis Engineers
1996.002 9 October 2019

Town of Norwood
Hydraulic Profile
Norwood WWTP Renovation
Scenario 1
Scenario 2
Aeration Basin Effluent Pipe
Pipe Length (ft)
30 ft
30 ft
Diameter (in)
16 in
16 in
FK
0.6
0.6
C
140
100
Hf
0.00 ft
0.15 ft
Hm
0.01 ft
0.13 ft
Total HL
0.01 ft
0.28 ft
Downstream Hydraulic Level
235.92 ft
237.73 ft
Hydraulic Grade
235.93 ft
238.01 ft
Aeration Basin Effluent Pipe (combined)
Pipe Length (ft)
290 ft
290 ft
Diameter (in)
16 in
16 in
IK
1.2
1.2
C
140
100
Hf
0.17 ft
1.43 ft
H m
0.05 ft
0.26 ft
Total HL
0.22 ft
1.70 ft
Downstream Hydraulic Level
235.70 ft
236.04 ft
Hydraulic Grade
235.92 ft
237.73 ft
Willis Engineers
1996.002 10 October 2019

Town of Norwood
Hydraulic Profile
Norwood WWTP Renovation
Scenario 1
Scenario 2
Splitter Box (Weir 235.50)
Weir Elevation
235.5 ft
235.5 ft
Cw
3.33
3.33
Length
4.00 ft
4.00 ft
H Low
0.20 ft
0.54 ft
Hydraulic Grade
235.70 ft
236.04 ft
Clarifier Influent Pipe
Pipe Length (ft)
85 ft
85 ft
Diameter (in)
20 in
20 in
F K
0.9
0.9
C
140
100
Hf
0.00 ft
0.32 ft
H m
0.00 ft
0.19 ft
Total H L
0.01 ft
0.52 ft
Downstream Hydraulic Level
234.04 ft
234.12 ft
Hydraulic Grade
234.05 ft
234.64 ft
Secondary Clarifier (Weir 234.00)
V-Notch Weir
Angle
90
90 °
Weir Elevation
234.00 ft
234.00 ft
Cw
2.54
2.54
Length
314 ft
157 ft
Notch Spacing (Notches/ft)
2.0
2.0
Total Notches
628
314
Flow per Notch (cfs/notch)
0.001
0.013
H L
0.04 ft
0.12 ft
Hydraulic Grade
234.04 ft
234.12 ft
Willis Engineers
1996.002 11 October 2019

Town of Norwood
Hydraulic Profile
Norwood WWTP Renovation
Scenario 1
Scenario 2
Piping to Chlorine Contact
Pipe Length (ft)
104 ft
104 ft
Diameter (in)
20 in
20 in
FK
0.3
0.3
C
140
100
Hf
0.00 ft
0.11 ft
H m
0.00 ft
0.02 ft
Total H L
0.00 ft
0.13 ft
Downstream Hydraulic Level
231.16 ft
231.66 ft
Hydraulic Grade
231.16 ft
231.79 ft
Piping to Chlorine Contact (Combined)
Pipe Length (ft)
93 ft
93 ft
Diameter (in)
20 in
20 in
FK
0.3
0.3
C
140
100
Hf
0.01 ft
0.10 ft
H m
0.00 ft
0.02 ft
Tota I H L
0.01 ft
0.11 ft
Downstream Hydraulic Level
231.15 ft
231.55 ft
Hydraulic Grade
231.16 ft
231.66 ft
Chlorine Contact (Weir 231.00)
Weir Elevation
231.00 ft
231.00 ft
Cw
3.33
3.33
Length
3.0 ft
3.0 ft
H LL.w
0.15 ft
0.55 ft
Hydraulic Grade
231.15 ft
231.55 ft
Willis Engineers
1996.002 12 October 2019

Town of Norwood
Norwood WWTP Renovation
RAS System Head Development
The Return Activated Sludge (RAS) pumps were analyzed for two different flow scenarios. The first
scenario was to assess a single pump's performance at the current average daily flow of approximately
0.40 million gallons per day (MGD), which is equivalent to approximately 280 gallons per minute
(GPM). In this scenario, the piping was assumed to be new with a C value of 140. A system head curve
was developed for the most restrictive one -pump conditions, with only one aeration basin in service.
The second pump scenario assessed was for the design flow condition of 0.75 MGD. This scenario
assumed three pumps will be in operation to provide a recycle ratio of 1.0 the average daily flow, which
equates to approximately 520 GPM. These modeling efforts assumed that three of the four RAS pumps
would be in service, and the piping was old, with the C value of 100. Also, for this scenario the most
restrictive conditions were assumed, with only one aeration basin in service.
Willis Engineers
1996.002 13 October 2019

Town of Norwood
Norwood WWTP Renovation
RAS System Head Development
Scenario 1 - System Head Curve illustrating 1 RAS Pump on with C=140
Scenario 2 - System Head Curve illustrating 3 RAS Pumps on with C=100
System Configuration
Pump Selection
Top of Wetwell
236.00 ft MSL
Discharge
4"
Wetwell Bottom
216.25 ft MSL
Impeller
7.688"
Water Level
234.00 ft MSL
Motor
5 HP
Discharge
242.00 ft MSL
Efficiency
62.3%
Static Head
8.00 ft
Speed
1130 RPM
Aeration Basins Online 1
w
25
NE
Me
5
0
0
/
\00r•
i
i
/
/
/
Scenario 1
Scenario 2
1 Pump On
3 Pumps On
1 Pump Efficiency
— — — 3 Pump Efficiency
200 400 600 800
Flow (gpm)
Note: Pump curve shown for Fairbanks Nijhuis 5431
70
.E
50
0
V
40
w
GE
20
0
1000
Willis Engineers
1996.002 14 October 2019

Town of Norwood
Norwood WWTP Renovation
Scenario 1 - Calculations
Friction losses based on C =
Diameter (in)
Length (ft)
Sum K
Q (gpm)
Hf
290
0.5
520
Q (gpm)
Hf
0
0.0
50
0.0
100
0.1
150
0.1
200
0.3
230
0.3
300
0.5
350
0.7
400
0.9
450
1.1
500
1.4
550
1.7
600
1.9
650
2.3
700
2.6
750
2.9
800
3.3
850
3.7
Willis Engineers
1996.002
RAS System Head Development
140
6 8 8
77 501 125
6.67 1.4 1.37
Duty Point
Hm
Hf
Hm
Hf
Hm
TDH
1.1
0.8
0.1
0.2
0.1
10.8
See Next Page for
Calculation
16.4
Hm
Hf
Hm
Hf
Hm
TDH
0.0
0.0
0.0
0.0
0.0
8.0
0.0
0.0
0.0
0.0
0.0
8.1
0.1
0.1
0.0
0.0
0.0
8.4
0.3
0.2
0.0
0.1
0.0
8.8
0.5
0.4
0.0
0.1
0.0
9.4
0.7
0.5
0.0
0.1
0.0
9.8
1.2
0.9
0.1
0.2
0.1
11.0
1.6
1.2
0.1
0.3
0.1
12.0
2.1
1.5
0.1
0.4
0.1
13.2
2.7
1.8
0.2
0.5
0.2
14.5
3.3
2.2
0.2
0.6
0.2
15.9
4.0
2.7
0.3
0.7
0.3
17.5
4.8
3.1
0.3
0.8
0.3
19.3
5.6
3.6
0.4
0.9
0.4
21.2
6.5
4.1
0.4
1.0
0.4
23.2
7.5
4.7
0.5
1.2
0.5
25.3
8.5
5.3
0.6
1.3
0.6
27.6
9.6
5.9
0.6
1.5
0.6
30.0
15 October 2019

Town of Norwood
Norwood WWTP Renovation
Scenario 2 - Calculations
RAS System Head Development
System Configuration
Pump
Top of Wetwell
236.00 ft
MSL
Discharge
4"
Wetwell Bottom
216.25 ft
MSL
Impeller
7.688"
Water Level
234.00 ft
MSL
Motor
5 HP
Discharge
242.00 ft
MSL
Efficiency
62.3%
Static Head
8.00 ft
Speed
1130 RPM
Aeration Basins Online
1
Friction losses based on
C =
100
Diameter (in)
6
6
6
8
8
Length (ft)
28
41
8
501
125
Sum K
4.87
1.1
0.7
1.4
1.37
Duty Point
Q (gpm)
Hf
Hm
Hf
Hm
Hf
Hm
Hf
Hm
Hf
Hm
TDH
520
0.1
0.3
1.0
0.3
0.3
0.4
4.5
0.2
1.1
0.2
16.4
Q (gpm)
Hf
Hm
Hf
Hm
Hf
Hm
Hf
Hm
Hf
Hm
TDH
0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
8.0
50
0.0
0.0
0.0
0.0
0.0
0.0
0.1
0.0
0.0
0.0
8.1
100
0.0
0.0
0.0
0.0
0.0
0.0
0.2
0.0
0.1
0.0
8.4
150
0.0
0.0
0.1
0.0
0.0
0.0
0.4
0.0
0.1
0.0
8.8
200
0.0
0.0
0.2
0.0
0.0
0.1
0.8
0.0
0.2
0.0
9.4
250
0.0
0.1
0.3
0.1
0.1
0.1
1.2
0.1
0.3
0.1
10.1
300
0.0
0.1
0.4
0.1
0.1
0.1
1.6
0.1
0.4
0.1
11.0
350
0.1
0.1
0.5
0.1
0.1
0.2
2.1
0.1
0.5
0.1
12.0
400
0.1
0.2
0.6
0.2
0.2
0.2
2.7
0.1
0.7
0.1
13.1
450
0.1
0.2
0.8
0.2
0.2
0.3
3.4
0.2
0.9
0.2
14.4
500
0.1
0.3
0.9
0.2
0.3
0.4
4.1
0.2
1.0
0.2
15.8
550
0.1
0.3
1.1
0.3
0.3
0.4
4.9
0.3
1.2
0.3
17.3
600
0.2
0.4
1.3
0.4
0.4
0.5
5.8
0.3
1.4
0.3
19.0
650
0.2
0.5
1.5
0.4
0.4
0.6
6.7
0.4
1.7
0.4
20.7
700
0.2
0.5
1.7
0.5
0.5
0.7
7.7
0.4
1.9
0.4
22.6
750
0.3
0.6
1.9
0.6
0.6
0.8
8.8
0.5
2.2
0.5
24.7
800
0.3
0.7
2.2
0.6
0.6
0.9
9.9
0.6
2.5
0.6
26.8
850
0.3
0.8
2.4
0.7
0.7
1.0
11.1
0.6
2.8
0.6
29.1
Willis Engineers
1996.002 16 October 2019

PIPING SCHEDULE
DIAMETER LENGTH K
6-INCH 76 FT 6.67
0 8-INCH 626 FT 2.77
I
0
z
ti
J
U
Z
I
r
r
N
04
N
Z
0
O
of
Q
U
S
K
O
Z
uj
Q
2
U
W
U
g
a
uj
w
Y
N
O
O
n
O
U
Z DATE:
N OCTOBER 2019
w TOWN OF NORWOOD PROJECT NO:
(BAN�UUIIIIS NORWOOD WWTP RENOVATION SCALE:
19ss.002
uj
N E N G I N E E R S RAS SYSTEM HEAD DEV. 1" = 50'
PAGE NO.
317

m
1/3Q
2/3Q
TOWN OF NORWOOD
■ NORWOOD WWTP RENOVATION
UUIIIIS RAS SYSTEM HEAD DEV.
E N G I N E E R S SCENARIO 2 FLOW
OCTOBER
PROJECT NO:
1996.002
SCALE:
1" = 5-
PAGE NO.
18

Town of Norwood WAS System Head Development
Norwood WWTP Renovation
The Waste Activated Sludge (WAS) pumps were analyzed for two different flow scenarios. The WAS
pumps will serve as the sludge wasting pumps during normal operating conditions, but will also have
the ability to act as a drain pump for either of the secondary clarifiers. This will be accomplished
through the use of a variable frequency drive and an isolation valve within the sludge pump station.
The first scenario assessed, referred to as Scenario 1, was the WAS pumps serving as the WWTP waste
pumps. In this scenario, a single WAS pump system head curve was developed to model the
conveyance of sludge from the sludge pump station to the sludge drying bed. Piping was assumed to
be new with a C value of 140. For the system head curve, this pump was represented by a pump
operating at 1155 RPM.
Scenario 2 was to assess the most restrictive operating conditions of a waste pump. When the WAS
pumps are draining a clarifier, the water level drawdown will lead to higher head conditions, requiring
the VFDs to increase the operating rate. This scenario was modeled assuming wastewater will be
pumped from the sludge pump station and discharging in the Parshall flume. The most restrictive
conditions were assumed, with old piping having a C value of 100. For the system head curve, this
pump was represented by a pump operating at 1585 RPM.
Willis Engineers
1996.002 19 October 2019

Town of Norwood
Norwood WWTP Renovation
WAS System Head Development
Scenario 1 - System Head Curve 1 WAS pump at 1155 RPM and C=140
Scenario 2 - System Head Curve with 1 WAS Pump on at 1585 RPM and C=100
System Configuration
Pump Selection
Top of Wetwell
236.00 ft MSL
Discharge
3"
Wetwell Pumps Off
216.25 ft MSL
Impeller
7.938"
Water Level
234.00 ft MSL
Motor
5 HP
Discharge
246.50 ft MSL
Efficiency
62.00%
Static Head
12.50 ft
Speed
1155 RPM
50
45
40
35
d
x
30
R
C
0
25
0
20
15
10
5
0
/
Scenario 1
Scenario 2
1155 RPM Pump
1585 RPM
— — — 1155 RPM Efficiency
— — — 1585 RPM Efficiency
0 50 100 150 200 250
Flow (gpm)
Note: Pump curve shown for Fairbanks Nijhuis 5432
100
90
80
70
60
T
50
c
m
.2
w
w
W
40
30
20
10
0
300 350
Willis Engineers
1996.002 20 October 2019

Town of Norwood
Norwood WWTP Renovation
Scenario 1 - Calculations
WAS System Head Development
Friction losses based on C =
140
Diameter (in)
4
6
Length (ft)
77
624
Sum K
6.47
6.54
Duty Point
Q (gpm)
Hf
Hm
Hf
Hm
TDH
Drain TDH
200
1.8
2.6
2.1
0.5
19.5
200
See
Next Page for Calculations
40.6
Q (gpm)
Hf
Hm
Hf
Hm
TDH
Drain TDH
0
0.0
0.0
0.0
0.0
12.5
30
50
0.1
0.2
0.2
0.0
13.0
31
100
0.5
0.7
0.6
0.1
14.4
33
150
1.1
1.5
1.2
0.3
16.6
36
200
1.8
2.6
2.1
0.5
19.5
41
250
2.8
4.1
3.1
0.8
23.3
46
300
3.9
5.9
4.4
1.2
27.8
53
350
5.2
8.0
5.8
1.6
33.1
60
400
6.6
10.5
7.4
2.1
39.1
69
450
8.2
13.3
9.2
2.7
45.9
79
500
10.0
16.4
11.2
3.3
53.4
89
550
11.9
19.8
13.4
4.0
61.6
101
600
14.0
23.6
15.7
4.7
70.5
114
650
16.2
27.7
18.3
5.5
80.2
128
700
18.6
32.1
20.9
6.4
90.6
142
750
21.1
36.9
23.8
7.4
101.6
158
800
23.8
42.0
26.8
8.4
113.4
175
850
26.6
47.4
30.0
9.5
125.9
193
900
29.6
53.1
33.3
10.6
139.1
211
950
32.7
59.2
36.8
11.8
153.0
231
1000
35.9
65.6
40.5
13.1
167.6
251
Willis Engineers
1996.002 21 October 2019

Town of Norwood
Norwood WWTP Renovation
Scenario 2 - Calculations
System Configuration
Top of Wetwell
236.00 ft MSL
Wetwell Pumps Off
216.25 ft MSL
Water Level
234.00 ft MSL
Discharge
246.50 ft MSL
Drain Static Head
30.25 ft MSL
Friction losses based on C = 100
Diameter (in)
Length (ft)
Sum K
Q (gpm)
Hf
200
3.4
Q (gpm)
Hf
0
0.0
50
0.3
100
0.9
150
2.0
200
3.4
250
5.2
300
7.2
350
9.6
400
12.3
450
15.3
500
18.6
550
22.2
600
26.0
650
30.2
700
34.6
750
39.3
800
44.3
850
49.6
900
55.1
950
60.9
1000
67.0
4 6
77 624
6.47 6.54
WAS System Head Development
Pump Selection
Discharge 3"
Impeller 7.938"
Motor 5 HP
Efficiency 62.00%
Speed 1585 RPM
Duty Point
Hm
Hf
Hm
Drain TDH
2.6
3.8
0.5
40.6
Hm
Hf
Hm
Drain TDH
0.0
0.0
0.0
30.3
0.2
0.3
0.0
31.0
0.7
1.1
0.1
33.0
1.5
2.3
0.3
36.3
2.6
3.8
0.5
40.6
4.1
5.8
0.8
46.1
5.9
8.1
1.2
52.7
8.0
10.8
1.6
60.3
10.5
13.9
2.1
69.0
13.3
17.2
2.7
78.7
16.4
20.9
3.3
89.4
19.8
25.0
4.0
101.2
23.6
29.3
4.7
113.9
27.7
34.0
5.5
127.7
32.1
39.0
6.4
142.4
36.9
44.3
7.4
158.1
42.0
49.9
8.4
174.9
47.4
55.9
9.5
192.5
53.1
62.1
10.6
211.2
59.2
68.6
11.8
230.8
65.6
75.5
13.1
251.3
Willis Engineers
1996.002 22 October 2019

PIPING SCHEDULE
DIAMETER LENGTH K
4-INCH 77 FT 6.47
0 6-INCH 624 FT 6.54
I
0
z
ti
J
U
Z
I
r
r
N
04
N
Z
0
O
of
Q
U
S
K
O
Z
Li
Q
2
U
W
U
g
a
uj
w
Y
N
O
O
n
O
U
Z DATE:
N OCTOBER 2019
w TOWN OF NORWOOD PROJECT NO:
0 (v�i UUIIIIS NORWOOD WWTP RENOVATION sE: 'sss.002
N LU
E N G I N E E R S WAS SYSTEM HEAD DEV. 1" = 50'
PAGE NO.
3 23

Town of Norwood Scum Pump System Head Development
Norwood WWTP Renovation
The scum pumps were analyzed for two different flow scenarios. For Scenario 1, a single scum pump
system head curve was developed to model the conveyance of sludge from the scum pump station to
the sludge drying bed with the piping assumed to be new with a C value of 140. The scum wet well was
assumed to be full, simulating the least restrictive conditions.
For Scenario 2, a single scum pump system head curve was developed to model the conveyance of
sludge from the scum pump station to the sludge drying bed and the piping was assumed to be old
with a C value of 100. The scum wet well was assumed to be empty, simulating the most restrictive
conditions.
Willis Engineers
1996.002 24 October 2019

Town of Norwood
Norwood WWTP Renovation
Scum Pump System Head Development
Scenario 1 - System Head Curve illustrating 1 scum pump on with a full well and C=140
Scenario 2 - System Head Curve illustrating 1 scum pump on with an empty well and C=100
System Configuration
Pump Selection
Top of Wetwell
236.00 ft MSL
Discharge
3"
Wetwell Pumps Off
226.00 ft MSL
Impleller
6.00"
Water Level
228.00 ft MSL
Motor
10 HP
Discharge
246.50 ft MSL
Efficiency
36.10
Static Head Full Well
18.50 ft
Speed
1750 RPM
4-
40
35
T
25
ih,
We
5
0
0 50 100 150 200 250
Flow (gpm)
Note: Pump curve shown for Vaughan V3FR
/
/
• Duty Point
Scenario 1
Scenario 2
1 Pump On
— — — Efficiency
300 350
50
45
40
35
0
T
30
w
25
20
15
10
400
Willis Engineers
1996.002 25 October 2019

Town of Norwood
Norwood WWTP Renovation
Scenario 1 - Calculations
Scum Pump System Head Development
Friction losses based on C =
140
Diameter (in)
4
6
Length (ft)
52
624
Sum K
6.67
6.54
Duty Point
Q (gpm)
Hf
Hm
Hf
Hm
TDH
155
0.8
1.6
1.3
0.3
22.5
119
See Next Page for Calcuations
24.0
Q (gpm)
Hf
Hm
Hf
Hm
Full TDH
0
0.0
0.0
0.0
0.0
18.5
50
0.1
0.2
0.2
0.0
19.0
100
0.3
0.7
0.6
0.1
20.2
150
0.7
1.5
1.2
0.3
22.3
200
1.2
2.7
2.1
0.5
25.0
250
1.9
4.2
3.1
0.8
28.5
300
2.6
6.1
4.4
1.2
32.7
350
3.5
8.3
5.8
1.6
37.7
400
4.5
10.8
7.4
2.1
43.3
450
5.5
13.7
9.2
2.7
49.6
500
6.7
16.9
11.2
3.3
56.6
550
8.0
20.4
13.4
4.0
64.3
600
9.4
24.3
15.7
4.7
72.7
650
10.9
28.6
18.3
5.5
81.8
700
12.5
33.1
20.9
6.4
91.5
750
14.3
38.0
23.8
7.4
101.9
800
16.1
43.3
26.8
8.4
113.0
850
18.0
48.8
30.0
9.5
124.7
900
20.0
54.7
33.3
10.6
137.1
950
22.1
61.0
36.8
11.8
150.2
1000
24.3
67.6
40.5
13.1
163.9
Willis Engineers
1996.002 26 October 2019

Town of Norwood Scum Pump System Head Development
Norwood WWTP Renovation
Scenario 2 - Calculations
System Configuration
Pump Selection
Top of Wetwell
236.00 ft MSL
Discharge
3"
Wetwell Pumps Off
226.00 ft MSL
Motor
10 HP
Water Level
228.00 ft MSL
Speed
1750 RPM
Discharge
246.50 ft MSL
Efficiency
31.30
Static Head Empty Well
20.50 ft
Friction losses based on C =
100
Diameter (in)
4
6
Length (ft)
52
624
Sum K
6.67
6.54
Duty Point
Q (gpm)
Hf Hm
Hf
Hm
TDH
119
0.9 1.0
1.5
0.2
24
Q (gpm)
Hf Hm
Hf
Hm
Empty TDH
0
0.0 0.0
0.0
0.0
21
50
0.2 0.2
0.3
0.0
21
100
0.6 0.7
1.1
0.1
23
150
1.4 1.5
2.3
0.3
26
200
2.3 2.7
3.8
0.5
30
250
3.5 4.2
5.8
0.8
35
300
4.9 6.1
8.1
1.2
41
350
6.5 8.3
10.8
1.6
48
400
8.3 10.8
13.9
2.1
56
450
10.3 13.7
17.2
2.7
64
500
12.5 16.9
20.9
3.3
74
550
15.0 20.4
25.0
4.0
85
600
17.6 24.3
29.3
4.7
96
650
20.4 28.6
34.0
5.5
109
700
23.4 33.1
39.0
6.4
122
750
26.6 38.0
44.3
7.4
137
800
29.9 43.3
49.9
8.4
152
850
33.5 48.8
55.9
9.5
168
900
37.2 54.7
62.1
10.6
185
950
41.1 61.0
68.6
11.8
203
1000
45.2 67.6
75.5
13.1
222
Willis Engineers
1996.002 27 October 2019

PIPING SCHEDULE
DIAMETER LENGTH K
4-INCH 52 FT 6.67
0 6-INCH 624 FT 6.54
I
0
z
ti
J
U
Z
I
r
r
N
04
N
Z
0
O
of
Q
U
S
K
O
Z
Li
Q
2
U
W
U
g
a
uj
w
Y
N
O
O
n
O
U
Z DATE:
N OCTOBER 2019
w TOWN OF NORWOOD PROJECT NO:
w�llIS NORWOOD WWTP RENOVATION SCALE: 'sss.002
uj
N E N G I N E E R S SCUM SYSTEM HEAD DEV. 1" = 50'
PAGE NO.
3 28

Town of Norwood
Norwood WWTP Renovation
Drain Pump System Head Development
The drain pumps were analyzed for two different flow scenarios. In the Scenario 1, a single drain pump
system head curve was developed to model the conveyance of drained unit process water from the
drain pump station to an aeration basin with the piping assumed to be new with a C value of 140. The
drain wet well was assumed to be full, and one RAS pump was assumed to be on, providing an
additional flow of 290 gallons per minute through the shared force main.
In Scenario 2, a single drain pump system head curve was developed to simulate the most restrictive
operative conditions these pumps will undergo. For this scenario, the wet well was assumed to be
empty, the piping was assumed to be old with a C value of 100, and three RAS pumps were assumed
to be on, providing an additional flow of 520 GPM through the common force main.
Willis Engineers
1996.002 29 October 2019

Town of Norwood
Norwood WWTP Renovation
Drain Pump System Head Development
Scenario 1 - System Head Curve illustrating 1 drain pump and 1 RAS pump in service with C=140
Scenario 2 - System Head Curve illustrating 1 drain pump and 3 RAS pumps in service with C=100
System Configuration
Pump Selection
Top of Wetwell
233.50 ft MSL
Discharge 3"
Pumps off
219.50 ft MSL
Impeller 6.81"
Water Level
221.50 ft MSL
Motor 3 HP
Discharge
242.00 ft MSL
Efficiency 64.8%
Static Head
20.50 ft
Speed 1725 RPM
Aeration Basins Online 1
2
50
40
m
x
E
c
p 30
H
20
10
0
0 50 100 150
Flow (gpm)
Note: Pump curve shown for Fairbanks Nihjuis 5431
i
i
Scenario 1
Scenario 2
Pump
— — Efficiency
200 250
70
60
50
40 0
c
m
.2
30 w
20
10
0
300
Willis Engineers
1996.002 30 October 2019

Town of Norwood
Norwood WWTP Renovation
Scenario 1 - Calculations
Friction losses based on C =
Diameter (in)
Length (ft)
Sum K
Q (gpm)
Hf
200
0.5
155
Q (gpm)
Hf
0
0.0
50
0.0
100
0.2
150
0.3
200
0.5
230
0.7
300
1.2
350
1.5
400
2.0
450
2.5
500
3.0
550
3.6
600
4.2
650
4.8
700
5.5
750
6.3
800
7.1
850
7.9
Willis Engineers
1996.002
Drain Pump System Head Development
140
4 6 8
23 129 570
4.77 1.8 3.87
Duty Point
Hm
Hf
Hm
Hf
Hm
TDH
1.9
0.7
0.1
2.3
0.5
26.7
See Next Page for Calculations
32.2
Hm
Hf
Hm
Hf
Hm
TDH
0.0
0.0
0.0
0.9
0.2
21.6
0.1
0.0
0.0
1.2
0.3
22.2
0.5
0.1
0.0
1.6
0.4
23.3
1.1
0.3
0.1
2.0
0.5
24.7
1.9
0.4
0.1
2.4
0.6
26.6
2.6
0.6
0.2
2.7
0.7
27.9
4.4
0.9
0.3
3.4
0.9
31.5
5.9
1.2
0.4
4.0
1.0
34.6
7.7
1.5
0.6
4.6
1.2
38.1
9.8
1.9
0.7
5.2
1.3
41.9
12.1
2.3
0.9
5.9
1.5
46.2
14.6
2.8
1.1
6.6
1.7
50.9
17.4
3.3
1.3
7.4
1.9
55.9
20.4
3.8
1.5
8.1
2.2
61.4
23.7
4.3
1.8
9.0
2.4
67.2
27.2
4.9
2.0
9.8
2.7
73.4
30.9
5.5
2.3
10.7
2.9
80.0
34.9
6.2
2.6
11.6
3.2
87.0
31 October 2019

Town of Norwood
Norwood WWTP Renovation
Scenario 2 - Calculations
Drain Pump System Head Development
System Configuration
Pump Selection
Top of Wetwell
233.50 ft MSL
Discharge
3"
Pumps off
219.50 ft MSL
Impeller
6.81"
Water Level
221.50 ft MSL
Motor
3 HP
Discharge
242.00 ft MSL
Efficiency
64.8%
Static Head
20.50 ft
Speed
1725 RPM
Aeration Basins Online
1
Friction losses based on C
=
100
Diameter (in)
4
6
8
Length (ft)
23
129
570
Sum K
4.77
1.8
3.87
Duty Point
Q (gpm)
Hf
Hm Hf
Hm
Hf
Hm
TDH
155
0.6
1.2 0.5
0.1
8.2
1.1
32.2
Q (gpm)
Hf
Hm Hf
Hm
Hf
Hm
TDH
0
0.0
0.0 0.0
0.0
5.1
0.7
26.2
50
0.1
0.1 0.1
0.0
6.0
0.8
27.6
100
0.3
0.5 0.2
0.0
7.0
0.9
29.5
150
0.6
1.1 0.5
0.1
8.1
1.1
31.9
200
1.0
1.9 0.8
0.1
9.3
1.3
34.9
230
1.3
2.6 1.0
0.2
10.0
1.4
37.0
300
2.2
4.4 1.7
0.3
11.8
1.6
42.4
350
2.9
5.9 2.2
0.4
13.1
1.9
47.0
400
3.7
7.7 2.9
0.6
14.6
2.1
52.0
450
4.6
9.8 3.6
0.7
16.1
2.3
57.5
500
5.5
12.1 4.3
0.9
17.6
2.6
63.6
550
6.6
14.6 5.2
1.1
19.3
2.8
70.1
600
7.8
17.4 6.1
1.3
21.0
3.1
77.1
650
9.0
20.4 7.0
1.5
22.7
3.4
84.6
700
10.3
23.7 8.1
1.8
24.6
3.6
92.6
750
11.7
27.2 9.2
2.0
26.5
4.0
101.0
800
13.2
30.9 10.3
2.3
28.4
4.3
110.0
850
14.8
34.9 11.6
2.6
30.4
4.6
119.4
Willis Engineers
1996.002 32 October2019

PIPING SCHEDULE
DIAMETER LENGTH K
4—INCH 23 FT 4.77
0 6—INCH 129 FT 1.80
I
0 8—INCH 570 FT 3.87
z
6
J
U
Z
I
r
r
N
04
N
Z
0
O
of
Q
U
S
K
O
Z
Li
Q
2
U
W
U
g
a
uj
w
Y
N
O
O
n
O
U
Z DATE:
N OCTOBER 2019
w TOWN OF NORWOOD PROJECT NO:
BA
N 'sss.002
UUIIIIS NORWOOD WWTP RENOVATION 11E:
N E N G I N E E R S DRAIN PUMP SYSTEM HEAD DEV. 1" = 50'
PAGE NO:
3 33

Town of Norwood
Norwood WWTP Renovation
Buoyancy
Maximum Ground Water Elevation
Depth to Wet Well Invert
Wet Well Cross Section Area
Bottom Slab Area
Bottom Slab Thickness
Wet Well Volume
Submerged Depth
Submerged Volume
Sludge Pump Station Buoyancy Calculation
226.40 ft MSL
21.75 ft
156.00 ft 2
217.00 ft 2
1.50 ft
3719 ft 3
12 ft
2221 ft 3
Weight of Water 62.4 pcf
Buoyancy 138,584 lb
Structure Weight
Cross Sectional Area of Concrete Walls
41
Weight of Walls
138221
Weight of Divider Wall
22475
Weight of Base
50453 Ibs
Weight of Soil
27953
Unit Weight of Reinforced Concrete
155 pcf
Unit Weight of Saturated Soil
47.6 pcf
Approximate Weight of Structure
239,102 lb
Net Downforce
100,518 lb
(ok)
Willis Engineers
1996.002 34 October 2019

Town of Norwood
Norwood WWTP Renovation
Buoyancy
Maximum Ground Water Elevation
Depth to Wet Well Invert
Wet Well Cross Section Area
Bottom Slab Area
Bottom Slab Thickness
Submerged Volume
Chlorine Contact Chamber Buoyancy Calculation
226.40 ft MSL
7.00 ft
1,199 ft 2
1,417 ft 2
1.50 ft
1983 ft 3
Submerged Depth 1.4 ft
Weight of Water 62.4 pcf
Buoyancy 1231760 lb
Structure Weight
Cross Sectional Area of Concrete Walls
921
Weight of Walls 998,743
Weight of Base 329,376 Ibs
Weight of Soil 72,638
Unit Weight of Reinforced Concrete 155 pcf
Unit Weight of Saturated Soil 48 pcf
Approximate Weight of Structure 1,400,756 lb
Net Downforce
1,276,996 lb
(ok)
Willis Engineers
1996.002 35 October 2019

Town of Norwood
Norwood WWTP Renovation
Buoyancy
Maximum Ground Water Elevation
Depth to Wet Well Invert
Wet Well Cross Section Area
Bottom Slab Area
Bottom Slab Thickness
Wet Well Volume
Scum Pump Station Buoyancy Calculation
226.40 ft MSL
12.00 ft
19.51 ft 2
24.17 ft 2
0.42 ft
244 ft 3
Submerged Wall Depth
2 ft
Submerged Volume
57 ft 3
Weight of Water
62.4 pcf
Buoyancy
3,550 lb
Structure Weight
Cross Sectional Area of Concrete Walls
4 ft 2
Weight of Walls
6,523 Ibs
Weight of Base
1,561 Ibs
Weight of Soil
2,666 Ibs
Unit Weight of Reinforced Concrete
155 pcf
Unit Weight of Saturated Soil
47.6 pcf
Approximate Weight of Structure
10,750 lb
Net Downforce
7,200 lb
(ok)
Willis Engineers
1996.002 36 October 2019

Town of Norwood
Norwood WWTP Renovation
Buoyancy
Maximum Ground Water Elevation
Depth to Wet Well Invert
Wet Well Cross Section Area
Bottom Slab Area
Bottom Slab Thickness
Wet Well Volume
Drain Pump Station Buoyancy Calculation
226.40 ft MSL
17.50 ft
26.71 ft 2
40.32 ft 2
0.67 ft
494 ft 3
Submerged Wall Depth
9 ft
Submerged Volume
265 ft 3
Weight of Water
62.4 pcf
Buoyancy
16,512 lb
Structure Weight
Cross Sectional Area of Concrete Walls
7 ft 2
Weight of Walls
19,223 Ibs
Weight of Base
4,166 Ibs
Weight of Soil
11,334 Ibs
Unit Weight of Reinforced Concrete
155 pcf
Unit Weight of Saturated Soil
47.6 pcf
Approximate Weight of Structure
34,724 lb
Net Downforce
18,212 lb
(ok)
Willis Engineers
1996.002 37 October 2019

ELECTRICAL LOAD TABULATION
FEEDER DESCRIPTION
MDP-2 PANEL PA
175A
HEADWORKS BLOWERS
PANEL PC
DRAIN PUMP
STATION
POWER CENTER RF
SITE LIGHTING
MDP-3 PANEL RA
50A
MDP-6
EXISTING PANEL B
90A
MDP-7
EXISTING
50A
AERATOR BASIN
MDP-8
EXISTING
50A
AERATOR BASIN
TOTAL
GRIT SCREW
RAKE
SCUM PUMPS
RAS PUMPS
WAS PUMPS
CLARIFIERS
DRAIN PUMPS
MISC
MISC
MISC
MISC
AERATORS
AERATORS
TOTAL CONNECTED LOAD IS 195 KVA
THE EXISTING GENERATOR IS RATED 230 KW
KVA
2 ®
2HP
5.0
2HP
2.5
1HP
1.5
2 ®
10HP
22.0
4 ®
5HP
24.0
2 ®
5HP
12.0
2 ®
3HP
10.0
2.0
2.0
10.0
30.0
2 ® 15HP 32.0
2 ® 15HP 32.0
195.0