NC0087033_Authorization to Construct_20021220

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Michael F. Easley, Governor
State of North Carolina
December 20, 2002
The Honorable John Ray Campbell
Town of Harmony
P.O. Box 118
Harmony, NC 28634
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Subject: Authorization to Construct
ATC Number 087033A01
Town of Harmony
NPDES Permit NCO087033
Dear Mayor Campbell:
Alan W. Klimek, P.E., Director
Division of Water Quality
The Division Water Quality's NPDES Unit has reviewed your request for an Authorization to Construct for a
new wastewater treatment facility at the Town of Harmony. The Division is concerned with the ability of the
proposed treatment system to achieve the low effluent levels of ammonia required by Town's NPDES permit.
The design and performance of lagoon/wetland treatment systems with respect to ammonia (nitrification) is
not well defined or documented. This type of system is not widely used for treatment of domestic wastewater
in North Carolina. There is some evidence that these systems can reduce ammonia levels but typical
performance is not consistently below the Town's permit limit.
The design of the wetland system was reviewed according to EPA's Office of Water recommendations for
constructed wetlands. The EPA's recommended ammonia loading is 1 to 4 lb/acre/day. The Town's design
includes an ammonia loading of 5.2 lb/acre/day at 250,000 gpd. The Town's projected average flow for a 20
year period as given in the Engineering Alternatives Analysis was 114,589 gpd. The Town agreed to reduce
the allowable flow to 115,000 gpd to reduce the ammonia loading within an acceptable range. After the
system is in operation if there is a need for additional flow the town can petition to increase the flow based
on proven performance of the system..
The Division finds the proposed design satisfactory and hereby grants authorization for construction of the
following:
• Manual bar screen
• 1.42 acres Facultative lagoon with ten 2 Hp.aspirating aerators
• 6.9 acres free water surface wetland divided in two cells.
• Dual sand filters
• UV disinfection system
• Cascade aeration
• All related structures, equipment, piping, controls, and other appurtenances, as described in the proposed
plans and specifications.
This authorization to construct is conditioned to the following:
• The approved design capacity for the facility is 115,000 gpd (average design flow). Upon renewal the
permit will be modified to reflect this flow.
• The Town shall develop and submit to the Division an Operation and Maintenance Plan no later than 90
days after completion of construction of the treatment system. The plan shall describe the operational
procedures of the treatment system and include:
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Internet: http://h2o.enr.state.nc.us/

Town of Harmony WWTP 0
NPDES Permit No. NCO087033 `
ATC No. 087033AOI
Page 2
■ Harvesting and disposal of wetland vegetation
■ Lagoon/wetlands operations and maintenance
• The Town shall monitor the performance of the treatment system. If the performance is unsatisfactory
amendments must be made.
This Authorization to Construct is issued in accordance with Part III, Paragraph A of NPDES Permit No.
N00087033, issued November 15, 2001, and shall be subject to revocation unless the wastewater treatment
facilities are constructed in accordance with the conditions and limitations specified in that permit permit.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the
Permittee shall take immediate corrective action, including those that may be required by this Division, such
as the construction of additional or replacement wastewater treatment or disposal facilities.
The Permittee shall notify the Water Quality Supervisor of the Mooresville Regional Office, telephone
number 704-633-1699, at least forty-eight (48) hours prior to operation of the installed facilities, so that an
in -place inspection can be made. Notification shall be made during the normal office hours of 8:00 a.m. until
5:00 p.m., Monday through Friday.
Engineer's Certification
Upon completion of construction and prior to operation of the modified facility, the Permittee shall provide
the Division with a certification (copy enclosed) from a professional engineer registered in North Carolina
certifying that the permitted facility has been installed in accordance with the NPDES Permit, this
Authorization to Construct, and the approved plans and specifications. The Certification should be submitted
to: NCDENR / DWQ, NPDES Unit, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
Requirements for Certified Operator
The Permittee shall employ a certified wastewater treatment plant operator to be in responsible charge (ORC)
of the wastewater treatment facilities. The operator must hold a certificate of the type and grade at least
equivalent to or greater than the classification assigned to the wastewater treatment facilities by the
Certification Commission. The Permittee must also employ a certified back-up operator of the appropriate
type and grade to comply with the conditions of Title 15A, Chapter 8G, .0200. The ORC of the facility must
visit each Class I facility at least weekly and each Class II, III, and X facility at least daily, excluding
weekends and holidays; and must properly manage and document daily operation and maintenance of the
facility and comply with all other conditions of Title I5A, Chapter 8G, .0200.
Additional Reauirements
The Operational Agreement between the Permittee and the Environmental Management Commission is
incorporated herein by reference and is a condition of this Permit. Noncompliance with the terms of the
Operational Agreement shall subject the Permittee to all sanctions provided by G. S. 143-215.6 for violation
of or failure to act in accordance with the terms and conditions of this Permit.
Failure to abide by the requirements contained in this Authorization to Construct may subject the Permittee
to an enforcement action by the Division of Water Quality in accordance with North Carolina General Statute
143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not preclude the Permittee from complying with any and
all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local,
state, and federal) which have jurisdiction. The Permittee shall maintain a copy of the approved plans and
specifications on file for the life of the facility. One (1) copy of the approved plans and specifications is
enclosed for your records.

I
Town of Harmony WWTP
NPDES Permit No. NC0087033
ATC No. 087033A01
Page 3
If you have any questions about this Authorization to Construct, please contact Teresa Rodriguez, at (919)
733-5083, extension 595.
Sincerely,
Alan . Klimek
Director
Enclosures: Project Plans and Specifications (approved)
Engineer's Certification Form
cc: Mooresville Regional Office, Water Quality
Technical Assistance and Certification Unit
Central Files
NPDES Unit Files
Mrs. Lisa Alley, P.E. — Cavanaugh and Associates, P.A.
8064 North Point Boulevard, Suite 102
Winston-Salem, NC 27103

PROFESSIONAL ENGINEER'S CERTIFICATION
FOR
CONSTRUCTION OF WASTEWATER TREATMENT FACILITIES
ATC PROJECT NUMBER: 040266A02
NPDES Permit No. NCO087033
I, , am a duly registered Professional Engineer
(please print)
in the State of North Carolina and have been authorized to observe (circle one: periodically, weekly, full
time) the construction of the subject project for the Permittee:
Project No.: 087033A01
Project: Town of Harmony WWTP:
Bar screen
Facultative lagoon
Two free water surface wetland cells
Dual sand filter
UV disinfection system
Cascade aerator
Location: Iredell County
I hereby certify that I did regularly observe this project with due care and diligence and that the
construction was completed in substantial conformance with the Authorization to Construct and with the
approved plans and specifications.
Signature
Date
Registration No.
Upon completion of construction and prior to operation of the modified facility, the Permittee shall provide the
Division with a certification from a professional engineer certifying that the permitted facility has been installed in
accordance with the NPDES Permit, this Authorization to Construct, and the approved plans and specifications.
The Certification should be submitted to:
NCDENR/DWQ, NPDES Unit, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617

F
` t
Memo
To: File
From: Teresa Rodriguez
Date: 12/ 19/02
Subject: Permit NCO087033
The Town of Harmony was issued an Authorization to Construct for a lagoon/wetlands
treatment system on December 2002. In the approval of the ATC the flow was restricted
to 115,000 gpd to meet the design criteria for ammonia loading in the wetland. In the
next permit renewal, the flow should be adjusted in the permit.
Cavanaugh mentioned that they want to coordinate with NCSU to monitor the
performance of the wetlands system. Once the system is started follow up is
recommended to find out if the system is being monitored and to obtain copies of any
data or reports.

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ATC NOTES
NPDES Permit NCO087033
GENERAL. INFORMATION
ATC No.
0087033A01
FACILITY
Town of Harmony WWTP
RECEIVING STREAM
Dutchman Creek
COUNTY
Iredell
CLASS
C
BASIN
Pee Dee River
REVIEWER
Teresa Rodriguez
DATE
12/06/02
APPLICATION/PLANS PREPARED BY: Cavanaugh and Associates
8064 North Point Blvd.
Winston Salem, North Carolina 27106
SCOPE: Construction of a wastewater treatment system consisting of a manual bar screen, a facultative
lagoon with floating aerators, two shallow rooted wetlands, a sand filter, UV disinfection and effluent
cascade and monitoring station.
SUMMARY: This is a new facility for the Town of Harmony. Septic systems serve individual residences
and commerce. A grant will provide for a collection system and a treatment plant. A permit was issued
on November 2001 with the following limits:
Flow 250,000 gpd
BOD 30/45 mg/I
TSS 30/45 mg/I
Ammonia 2.4mg/I (summer)/4.7 mg/I (winter)
Funding Source: USDA Rural Development
Estimated Project Schedule: One year
Installation/Construction Cost: Estimate
SUBMISSIONS:
• Calculations
Engineering drawings
Specifications
PROJECT/EQUIPMENT DESCRIPTION:
WWTP Component
Capacity
Comments
Bar Screen
625,000 gpd
Manual bar screen sized for peak flow
Facultative lagoon
1.46 acres
Aeration provided by 10 — 2 hp floating
aspirating aerator.
Shallow rooted wetland
6.9 acres
Two wetland cells, 88 feet wide(bottom), one
feet of water, planted with cattails or other
suitable plants
Dual Sand filters
434 gpm
128 ft2 surface area
UV disinfection
625,0000 gpd
Two banks, each with 5 UV lamps modules
Metering manhole
Trapezoidal 600 flume. One each for influent
and effluent
Cascade aerator
Power generator

Page 2
ATC 87033A01
RECOMMENDATIONS:
The treatment system was designed based on an ultimate flow of 250,000 gpd, which is the permitted
flow. The permit has ammonia limits -of 2.4 mg/I in the summer and 4.7 mg/I in the winter. These low
limits were a concern when evaluating the proposed design.
Ammonia reduction in wetland systems is not well documented since this type of treatment system is not
very common. Wetland design is approached mainly on evaluation of existing systems performance and
translating the performance into design recommendations. Ammonia reduction in lagoon/wetlands
systems has not been widely studied. Two wetland systems are in operation in North Carolina for
treatment of domestic wastewater. The effluent data for both systems were evaluated. The effluent
ammonia values were above 2 mg/I on several samples. The comparison between these systems and
Harmony's proposed wetland is not straightforward because the components are not the same and one of
the systems doesn't have ammonia limits and the other has ammonia limits but are higher than
Harmony's.
EPA's Office of Water has published design recommendations for wetland design in the document EPA
832-F-00-024. EPA recommends a BOD loading rate of 9 to 89 lb/acre/day, and ammonia loading of 1 to
4 lb/acre/day. The State of Georgia has guidelines for wetland design requiring loading rates for ammonia
of 1 to 2.7 lb/acre/day when the effluent limits are 1 to 2 mg/I. The proposed ammonia loading for the
Town of Harmony was around 5 lb/acre/day. A review of the projected flows for the town revealed that
the average daily flow expected in a 20 year period was around 115,000 gpd. By reducing the design
flow to 115,000 gpd the ammonia loading is within the range recommended by EPA. The issuance of the
ATC will be conditioned to reducing the allowable flow to 115,000 gpd. After the system is constructed
and evaluated for a reasonable period of time the town can request an increase in flow if the performance
of the treatment system shows the it can meet the limits.
If funding is obtained researchers at NCSU are interested in studying the performance of this particular
treatment system, including the nutrient reduction in the lagoon and the wetland.
The Regional Office recommended that they develop an Operational and Management Plan to address
the harvesting of the plants.

H
October 28, 2002
Ms. Teresa Rodriguez
NPDES Unit
NCDENR-DWQ
1617 Mail Service Center
Raleigh, NC 27699-1617
Re: Request for Additional Information
Town of Harmony
NPDES Permit NC0087033
ATC Number 087033A01
C&A Number HM9901
Dear Ms. Rodriguez:
OCT 29
FGE PEFI✓,IJ7�.��,G
In response to your request for additional information, please allow us to present the
following:
• The NC regulations require duality for primary components of the treatment system.
The filters are considered primary components of the treatment system and
therefore duality must be provided.
The design drawings have been modified to reflect the addition of a second
sand filter in parallel with the first. The reason a second filter was not included
in the original design is attributable to the fact that wetlands such as this one
possess the unique ability to equalize and even cease discharging and operate
in a recirculation mode for several consecutive days, if necessary, while
maintenance issues are attended to. The typical mechanical plant lacks this
capability, which is why duality regulations were formulated. A copy of the
revised plan sheets is attached.
• No calculations were provided to show that the treatment system has the ability to
produce an effluent with an ammonia concentration less than 2.4 mg/1 in the
summer and 4.7 mg/I in the winter. The ammonia reduction through the system was
not given. Please be aware that the Division is in the process of implementing daily
limits for ammonia for all permits with weekly ammonia limits. Upon your permit
renewal a daily maximum limit will be implemented.
"Wetland design has [not] been well characterized by published design
equations. Constructed wetlands are complex systems in terms of biology,
hydraulics and water chemistry. Furthermore, there is a lack of quality data of
sufficient detail, both temporally and spatially, on full scale constructed
wetlands ... An examination of the literature on constructed wetlands suggests
that all three of these models [linguistic, stochastic, deterministic] have been
proposed or used. Yet it is worth noting that none have really met the test of

Ms. Teresa Rodriguez
Re.: ATC No. 08703A01
October 28, 2002
Page 2 of 3
the iterative process..." (Constructed Wetlands Treatment of Municipal
Wastewaters, EPA, September 2000)
"...The rates of ammonium reduction in treatment wetlands are presently
predictable only from wetland data..." (Treatment Wetlands, Kadlec & Knight,
1996)
At the present time, it is simply not possible to separate out the discrete
mechanisms of ammonia reduction and realistically represent them
mathematically. Cavanaugh & Associates researched the ammonia removal
issue extensively (Research Bibliography, q.v.) and was unable to find or
develop suitable models or equations that would accurately describe the
required degree of ammonia reduction with the desired level of confidence.
However, this is not problematic, since the technology is still emerging and,
while wetlands by themselves are not purported to be primary nitrogen
removal systems, actual operating data demonstrates that a wetland -based
composite system is capable of achieving ammonia levels that satisfy the 2.4
mg/I & 4.7mg/I requirement. This can best be explained by stating that there is
synergism within lagoon -wetland systems that is, as yet, undefined. Our
design further exploits this synergism through the addition of the sand filter,
the recirculation line and the 16,000 square feet of sloped reaeration surface
within the cells. We are attaching copies of effluent sampling data from the
constructed wetlands at the Walnut Cove, NC site showing the ammonia levels
that the system is capable of achieving.
• The references for the loading rates were given as ref EPA, please provide the name
of the document and a copy of the information if available.
The loading rates referred to under the Wetland Sizing subheading on the
spreadsheet came from "Constructed Wetlands Treatment of Municipal
Wastewaters", Chapter 4, EPA/625/R-99/010, September, 2000
The oxygen requirement for ammonia reduction was not considered in the
calculations for sizing the aerators. Transfer rate for aerators was not given or taken
into account for the calculations.
This is not a conventional activated sludge system; the lagoon is
predominately facultative in nature. According to EPA, the lagoon technology
has been in widespread use in the United States for at least 90 years, with
more than 7000 facultative lagoons in operation today. Although sized to
satisfy BOD requirements, the aerators serve primarily to provide an "oxygen
cap" on the lagoon in order for the anaerobic, facultative and aerobic waste
stabilization processes to proceed. The aerators are not intended to meet
carbonaceous and nitrogenous demands or to mix. A conservative
(demonstrated) transfer rate of 2lbs. 02/lb BOD/day/hp-hr was utilized in the
sizing process to add operational flexibility to the overall system design.

Ms. Teresa Rodriguez
Re.: ATC No. 08703A01
October 28, 2002
Page 3of3
Constructed wetlands continue to be attractive research projects for doctoral theses
and the like, but they are still very complex ecosystems with multiple interactive
mechanisms that are not well understood. It is undeniable that they work. We have
tried to be conservative in our design and assumption of treatment efficiencies, based
on solid performance data from systems with which we've been intimately involved, as
well as reputable research literature. If we were not comfortable and confident with our
design's ability to perform, we would not be staking our professional reputation on it.
We do trust that our explanations are sufficient, and we will be more than happy to
entertain any other questions. If you would like to discuss this information, please do
not hesitate to contact us.
Sincerely,
Cavanaugh & Associates, P.A.
r/ �
Lisa Alley, P.E.
Enclosures
cc: Mayor John Ray Campbell, Town of Harmony

Research BiblioAraphy
Treatment Wetlands, Kadlec & Knight, 1996
Constructed Wetlands for Wastewater Treatment, Hammer, 1989
Constructed Wetlands Treatment of Municipal Wastewaters, EPA/625/R-99/010, 2000
Constructed Wetlands and Aquatic Plant Systems for Municipal Wastewater Treatment,
EPA/625/1-88/022, 1988
Subsurface Flow Constructed Wetlands for Wastewater Treatment, EPA 832-R-93-008,
1993
Constructed Wetlands for Animal Waste Treatment, Payne Engineering & CH2M Hill,
1997
Nitrogen Control, EPA/625/R-93/010, 1993
Wastewater Engineering, Metcalf & Eddy, Inc., 1979
Design of Municipal Wastewater Treatment Plants (MOP-8) Vol.1, WEF/ ASCE, 1992
Design of Municipal Wastewater Treatment Plants (MOP-8) Vol.2, WEF/ ASCE, 1992
Onsite Wastewater Treatment Systems Manual, EPA/625/R-00/008, 2002
Appropriate Technology for Sewage Pollution Control in the Wider Caribbean Region,
UNEP, 1998
A Handbook of Constructed Wetands Vol.1, USDA/NRCS/EPA/PDER
Free Water Surface Wetlands, EPA 832-F-00-024, 2000
Integrated Facultative Ponds: Their Use for Wastewater Treatment Prior to Land
Application, Fedler & Wheeler, 1997
Anaerobic Lagoons, EPA 832-F-02-009, 2002
Facultative Lagoons, EPA 832-F-02-014, 2002
Aerated, Partial Mix Lagoons, EPA 832-F-02-008, 2002
Development of a Holistic Ecological Model for Design of Facultative Waste Stabilization
Ponds in Tropical Climates, Kayombo,
Intermittent Sand Filters, EPA 932-F-99-067, 1999
Waste Stabilization Ponds, Mara, 1997

c � .
The Development of a New Approach to Waste Stabilization Pond Design, Mara, 1993
Wetlands: Subsurface Flow, EPA 832-F-00-023, 2000
Handbook —Retrofitting POTWs, EPA/625/6-89/020, 1989
Surface Aeration: Design and Performance for Lagoons, Humenik/Overcash/Miller, 2002
Land Treatment of Municipal Wastewater, EPA 625/1-81-013, 1981
In addition, numerous web sites were searched for pertinent information.

C S
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27604
1••
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RF-50URCES
To: Lisa Alley From: Teresa Rodriguez
Fax: [phone] Fax: [phone]
Phone: [phone] Phone: [phone] ext. 595
Pages: 3 Date: 10/21 /02
Re: Town of Harmony ATC
-Comments:
We need additional information on the design. The original letter will go out in the
mail.

of WArF�
-0 QG
� r
olit,
.V23ff%W-c
The Honorable John Ray Campbell
P.O. Box 118
Harmony, NC 28634
Dear Major Campbell:
Michael F. Easley, Governor
William G. Ross ]r., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water
October 21, 2002.
Subject: Request for Additional Information
Town of Harmony
NPDES Permit NCO087033
ATC Number 087033AOI
The additional information for the proposed expansion to the Town of Harmony Water Treatment Plant has been
completed. The following is a list of information needs and questions that were raised during the the review:
■ The NC regulations require duality for primary components of the treatment system. The
p1- • filters are considered primary components of the treatment system and therefore duality must
be provided.
■ No calculations were provided to show that the treatment system has the ability to produce an
effluent with an ammonia concentration less than 2.4 mg/1 in the summer and 4.7 mg/1 in the
winter. The ammonia reduction throughout the system was not given. Please be aware that
the Division is in the process of implementing daily limits for ammonia for all permits with
weekly ammonia limits. Upon your permit renewal a daily maximum limit will be
implemented.
■ The references for the loading rates were given as ref EPA, please provide the name of the
document and a copy of the information if available.
■ The oxygen requirement for ammonia reduction was not considered in the calculations for
X sizing the aerators. Transfer rate for aerators was not given or taken into account for the
calculations.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Visit us on the INTERNET @ www.enr.state.nc us

Town of Harmony
ATC No. 087033A01
Page 2
Please respond to the questions and provide the requested information prior to November 21, 2002.
Thank you in advance for your efforts in responding to this information request. This information will
greatly aid the Division in its review of the plans and specifications for the proposed project.
If you have any questions, please call me at [phone], extension 595.
Sincerely,
Tersesa Rodriguez,
NPDES Unit
Cc: NPDES Files
Mooresville Regional Office
Lisa Alley, P.E. — Cavanaugh & Associates
8064 North Point Blvd. Suite 102
Winston-Salem, NC 27106

September 5, 2002
Ms. Teresa Rodriguez
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re.: Harmony Sewer Project
C&A No.: HM9901
Dear Teresa:
CAVANAU G H
vINI[W r 11h INiy i]W'p";:",isFep
SEP - 9 2002
r; �f se:, eE ea; eM
This letter is in response to your request concerning additional information and
calculations for the Town of Harmony Constructed Wetlands Treatment Facility. The
following are the questions from our last meeting in our Winston-Salem office:
1. Show ammonia reduction at the end of the lagoon and at the end of the wetland.
Attached is documentation on Lagoon Management On page 7, it states that
"typically as much as 70% to 80% of the nitrogen converts to ammonia and is _
volatilized". In our calculations also enclosed, we have assumed a removal
efficiency of 30%, well below the typical. Ammonia removal at the end of the
wetland cells is also shown in our calculations. —�
2. Verify that the wetland volume used in the equation takes into account plant
mass volume.
Wetland treatment efficiencies are based on empirically demonstrated areal
relationships, i.e. nutrient mass assimilated per square foot of wetland. Plant
r�H • .` mass is already accounted for in the uptake relationship. Plant mass
accumulation over time is dealt with in the long range operating & maintenance
procedures.
3. Define how plants are put into the wetlands.
The wetland synthetic liners are backfilled with 1 foot of topsoil. This topsoil is
then brought up to minimum (or greater) moisture levels by irrigation or natural
precipitation. Live plantings (either tublings, bare -root seedlings or field
harvested cattails) are hand placed on the specified planting grid. More details
of wetland plantings are included in the specifications delivered to you last week.

Ms. Teresa Rodriguez
Re.: Harmony Sewer Project
September 5, 2002
Page Two
4. Show real lagoon and wetland volumes in calculations.
�r The enclosed calculations show real volumes.
V�
5. Sand Filter and UV Disinfection must have duality.
Dual UV modules have been included in the design. The polishing filter will only
need to be taken off-line for raking the bed —a bypass line has been provided for
this purpose, therefore duality is not necessary.
6. A generator at the UV Disinfection is required.
Plans and specifications have been modified to include a permanent generator at -
the - UV disinfection unit
Teresa, I hope this answers your questions to your satisfaction. If you need further
information or have other questions, please give me a call at 336/759-9001 or e-mail me
at [e-mail]. I appreciate your help with this project and look
forward to hearing from you soon!
Sincerely,
CAVANAUGH & ASSOCIATES, P.A.
Lisa Alley, P.E.
Enclosures
cc: Mayor John Ray Campbell, Town of Harmony

Harmony Wastewater Treatment Facility Design Calculations
Design Assumptions
Average Daily Design Flow 250,000 gpd /`l"�J
Influent Waste Characteristics
250 mgL
TSS
TSS 250 mglL ✓ I !(�)J`rRl1y/vy�'�\
NH, 35 mg/L
TKN 45 mg/L ✓ ,. ���
Hilt
Effluent Limitations'ILL'
BOD, 30 mg/L Prhr,t0ni(A 2,4 S. '7,2
TSS 30 mg/L --
4 9 W
Design Scheme: Facultative Lagoon => Constructed Weiland => UV Disinfection =, Cascade Aeration => Discharge _
Faculative Lagoon Design Assumptions:
The lagoon depth needs to be > 5 ft to achieve anaerobic conditions
The lagoon is mechanically aerated and the aeration shall be limited to the first 3 ft
Mechanical aeration is based upont2lb 02/lb BODR Hp-Hr.
Anaerobic design 4.51bs VS/1000 ft'-day
BOD, loading for anaerobic treatment up to 250 lb BOD511000 ft'-day (Use 50)
BOD, stabilization rate = 75-95%(Removal efficiency)
BODa = (BOD, • %Removal)
BODin (0.05' 8.34 - 250)
% Removal
Cu lf-. tcj.-OODn
n[ Cj rk z—
_ _j). Anaerobic Treatment Volume
50-196 BODR/(501b BODs/1000 tt'-day)
Conversion of Treatment Volume to gals
Design Solids Retention Time
�i ,d Anaerobic Volume ($RT'Vol)
t— Design Anaerobic Depth
Actual Anaerobic Volume
Aerobic Treatment Volume
Design Depth
Side Slopes (MA)
Actual Surface Area
Actual Total Volume
Aerobic Volume
Hydraulic Retention Time (no rain or storm)
521 lb/day
50%
261 Ib/day
5,213 ft'/day
38,990, gals/day --_
15 daysl
�_584,843 4al5fmaerobic
2ft
7 —1820,219 gals Anaerobic
68-
3
80.916 sq. ft.,
— 3,938,626 gallons 4—
,3,118,607 -gals;
12.5 days
Lagoon Final Sizing
25-Yr, 24 hour rainfall event 6 in
Freeboard _ _ 2.
Depth Total = Anaerobic + Aerobic + Rain + FB 10.5 ft
G°
CAVANAUGH
Solutions through integrity and partnership
Iaploplcflakesign toolslWelland DesgnTNWWaenony Page 711712002

Harmony Wastewater Treatment Facility Design Calculations 4,01 5fe(os
Aeration Sizing
Ib Oz/Ib BODa/daylHp-Hr
2.00
Hp Required
130 Hp/Hr
Aerator Run Time
24 Hrs
Theoretical Aerator Sizing
5.43 Hp
0
Selected Aerator Sizing
7 Hp
Total Lagoon Volume
3,938,826 gals
Iy
Wetland Sizing
0AVANAUG
I n -✓ YY11 n I Y!G . SWutlone through inre r
n k CS 10 n p / Vv �C �' 8 8 m' and portnershi
I,(v hP/hr @ Izhr�= 19.2 l P - ibY CLv A -e
TKN Design Loading Rate (5-15 to N/Ac-day)
ref Rice, Hu_ menik NCSU
TKN Design Loading. Rate (0 9-18 lb N/Ac-day)
ref FX6
BODs Design Loading Rate (2-163 UBODs7Ac-day)
ref EPA
UFhl
TSS Design Loading Rate (4 5-160 lb TSS/Ac-day)
ref EPA
-,I -
Selected Loading Rates
TKN (Ib N/Ac-day)
_
9,5-(a► '4
BOD, (Ib BOD51Ac-day)
83-
TSS (lb TSS/Acday)
83 —
Lagoon Removal Efficiencies
nm��
TKN Lagoon Removal Efficiency
30% lA
BOD5 Lagoon Removal Efficiency
50%
TSS Lagoon Removal Efficiency
50% J
Remaining to be treated by Wetland (in 'eff)
TKN
66 Iblday =
BOD,
261 lb/day
TSS
261 lb/day
Welland Sizing Based on Design Loadings
TKN
6.9 Acres -
BOD,
3.1 Acres
TSS
3.1 Acres
Selected Size
6.9 Acres_
Design Width (top)
100 it
Design Bottom (top)
88 it
Sideslope (M:1)
3
Maximum Water Depth
12 in
Number of Cells
2
Required Length Per Cell
1finZ fl
ROMOVOI *4. 'r0�
�a2:iIC1'�5 ?
Wetland Cells
3
Wetland Cells
100,
Welland Plantings 3' sp.
4" Planting Media —, r— 6-8" Water Level
J'
3
Li
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6.4 G�c' --> 300 5(O`f -�-�- T_or +he bo' unr
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C AVA N A U G H
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Project # A n\q a O t
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Designed by TN v4 Date
Checked Date NaNo C ALLS FoiL C vWwwTP

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Solutions through integrity and partnership
Project #
Sheet # of L4
Designed by Date
Checked Date

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CAVANAUGH
Solutions through integrity and partnership
Project #
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Designed by Date
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Solutions through integrity and portnership
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Date
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CAVANAUGH
Solutions through integrity and partnership
Project #
Sheet # of
Designed by F Date
Checked Date N tN T
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Town of Pembroke Characteristic Domestic Influent Ammonia - 2002
Influent Ammonia
March
14.5 mg/l
12.9 mg/1
15.6 mg/I
9.51 mg/1
9.31 mg/I
8.08 mg/I
April
14.5 mg/I
May
13.5 mg/l
15.9 mg/I
14.8 mg/I
15.3 mg/l
15.1 mg/I
12.6 mg/i
June
15.3 mg/I
July
18.3 mg/I
19.6 mg/I
17.4 mg11
15.3 mg/i
13.8 mgll
15.5 mg/l
20 mg/I
15.9 mg/I
18.1 mg/I
August 15.5 mg/I
September 14.5 mg/I
Maximum 20.0
Minimum 8.1
Average 14.8

CAVANAU G H
August 28, 2002
Ms. Teresa Rodriguez
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re.: Harmony Sewer Project
C&A No.: HM9901
Dear Teresa:
Attached are three sets of revised plarS and specifications for the Town of Harmony
Constructed Wetlands Wastewater Treatment Facility for your review. We will be
sending some additional calculations to answer some of your questions from your visit
with us last month. Please look for these calculations to come to you in the mail early
next week.
Please let me know if you need anything further to move this project towards an
Authorization to Construct. We look forward to hearing from you soonl
Sincerely,
CCAiVANAUGH & ASSOCIATES, P.A.
l�
Lisa Alley, P.E.
Enclosures
cc: Mayor John Ray Campbell, Town of Harmony

To: Permits and Engineering Unit
Water Quality Section
Attention: Teresa Rodriquez
SOC PRIORITY PROJECT: No
Date: July 23, 2002
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT
REPORT AND RECOMMENDATIONS
County: Iredell
MRO No.: 02-17
Permit No. NCO087033
ATC No.: 087033AOI
PART I - GENERAL INFORMATION
1. Facility and address: Town of Harmony
Post Office Box 118
Harmony, N.C. 28634
2. Date of on -site investigation (if conducted): January 12, 2001
3. Report prepared by: Michael L. Parker, Environmental Engineer II
4. Persons contacted and telephone number: Lisa Routh Alley, Cavanaugh & Associates,
P.A., [phone].
5. Verified discharge point(s), list for all discharge points:
Latitude: 350 56' 22" Longitude: 80' 47' 40"
Attach a USGS map extract and indicate treatment facility site and discharge point on
map.
USGS Quad No.: D 15 NE
6. Site size and expansion area consistent with application? Yes. The site encompasses = 65
acres, however, roughly 25 acres will be needed for WWTP construction.
7. Topography (relationship to flood plain included): The site has rolling topography with
slopes ranging from 3-12%. The lower portion of the site may be at or near flood plain
elevation, however, all WWT units will be constructed above any flood plain elevation.

Page Two
8. Location of nearest dwelling: None within 1000 feet of the site.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
Existing treatment facility
There is no existing W WT facility.
2. Type of proposed treatment facility: The applicant proposes to construct a constructed
wetlands treatment system consisting of influent flow measurement followed by a manual
bar screen, a facultative lagoon with surface aeration, a flow splitter box, two (2) parallel,
shallow rooted wetland cells, a polishing sand filter, ultraviolet disinfection, cascade
aeration, and effluent flow measurement.
3. Residuals handling and utilization/disposal scheme: There was no residuals disposal plan
submitted with the ATC. Prior to the issuance of this ATC, the applicant should be
required to submit a plan that will detail how accumulated residuals will be collected,
removed, and where they will be taken for final disposal.
4. Treatment plant classification: Class II
5. SIC Code(s): 4952
Wastewater code(s): 01
Main Treatment Unit code: 31110
6. Important SOC/JOC or compliance schedule dates: N/A
PART III - EVALUATION AND RECOMMENDATIONS
The Town of Harmony (The Town) has requested authorization to construct a 0.250
MGD wetlands W WT facility. The NPDES permit for this facility became effective December
1, 2001.
If constructed, this will the first WWT facility of this type in this region. A similar type
facility has been constructed in the Winston Region. According to WSRO staff, facility operation
and NPDES permit compliance has been consistently good. Also, seasonal temperature
fluctuations have also had little effect on treatment efficiency, an initial concern of MRO staff.
One operational consideration noted by WSRO staff is the need to occasionally remove (thin) the
wetland plants that will occupy the treatment cells. Apparently, the facility in the WSRO has
developed an over abundance of cattails that inhibit flow throughout the cells. Although the
harvesting of excessive vegetation may not necessarily need to be included as a condition of the
ATC, a wetland plant management plan should be included in any O&M plan developed for this
facility.

Page Three
The wastewater to be treated by this facility will be almost entirely domestic. The WWT
system proposed by the Town should be capable of complying with the assigned effluent
limitations with proper O&M. The ATC should contain a condition that the Town be required to
obtain DWQ approval for connection of any wastewater that may contain constituents considered
to be detrimental or difficult to treat using wetlands treatment, including constituents potentially
considered toxic to wetland vegetation. Wetlands treatment systems are not typically considered
viable options when handling waste streams heavy in industrial pollutants.
Pending a final technical review and approvalof the plans and specifications by the
NPDES Unit, it is recommended that an ATC be issued as requested.
�W4e�
Signature of Report Preparer D to
Water Quality egional Supervisor Date
hAateWcO2\h ony.atc

TOWN OF
HARMONY
PO BOX 118
HARMONY, NC 28634
Phone: [phone]
Fax:[phone]
Email:
harmonync @yadtel. net
John Ray Campbell,
Mayor
Martha Johnson,
Interim Clerk
Aldermen:
Scotty Harris
Martha Johnson
Ray Lewis
Robert Moore
March 15, 2002
Mr. Dave Goodrich, NPDES Unit Supervisor
NPDES Group, Water Quality Section
NC DENR—DWQ—NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re.: Harmony Wastewater Treatment Plant
C&A No.: HM9901
1•ZT.1i0il[ 6 @=$I1
This letter is to serve as notification that our consulting engineer, Cavanaugh &
Associates, P.A. is the authorized representative for the Town of Harmony
concerning the Harmony Sewer Collection and Wastewater Treatment Facility
Project. Cavanaugh & Associates, P.A. is authorized to submit to the North
Carolina Department of Environment and Natural Resources for an Authorization
to Construct (A to C) for the Harmony Constructed Wetlands Wastewater
Treatment Facility.
Sincerely,
•try • •/\7�•`'
Mayor

CAVANAU G H
Solab 01 th,oi,A integrity and partnership
March 25, 2002
Mr. Dave Goodrich, NPDES Unit Supervisor
NPDES Group, Water Quality Section
NC DENR — DWQ — NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re.: Harmony Wastewater Treatment Plant
C&A No.: HM9901
Dear Mr. Goodrich:
On behalf of the Town of Harmony, Cavanaugh & Associates, P.A. now submits the formal
request for an Authorization to Construct a 250,000-gallon per day Constructed Wetlands
Wastewater Treatment Plant to serve the town of Harmony. The Town has received funding for
the project from USDA Rural Development and The Rural Center. This proposed wastewater
treatment facility was issued NPDES Permit No. NC0087033 on November 15, 2001.
Components to be constructed include:
• Metering manhole for influent flow measurement and sampling
• Manual bar screen
• Facultative lagoon with ten 2 horsepower aerators
• Splitter box
• Parallel shallow rooted plant wetland cells
• Polishing sand filter
• Ultraviolet disinfection unit
• Cascade aerator
• Metering manhole for effluent flow measurement and sampling.
The following items are included in this packet for your review:
1. Three sets of detailed plans for the site work.
2. Three sets of sealed design specifications.
3. Two copies of a Flow Schematic and major component information.
4. Three sets of sealed design calculations.
5. Letter from the Town of Harmony designating Cavanaugh & Associates as an
authorized representative.
We hope that you will find everything in order for your review of this request. Upon receiving
your approval, we anticipate 60 days will be needed for securing the Town's construction
contract. The construction period is estimated to last 365 days.

Mr. David Goodrich
Harmony Wastewater Treatment Plant
C&A No.: HM9901
March 25, 2002
Page Two
Upon receipt of this submission package, if you have any questions or require additional
information, please do not hesitate to contact me by telephone at 336/759-9001 or by e-mail at
lallev(@cavanaughsolutions.com.
Sincerely,
CAVANAUGH & ASSOCIATES, P.A.
Enclosures
cc: Mayor John Ray Campbell, Town of Harmony

L
CAVANAU G H
Solutions through integrity and partnership
TOWN OF HARMONY
CONSTRUCTED WETLANDS
WASTEWATER TREATMENT FACILITY
Design Notes
HARMONY, IREDELL COUNTY, NORTH CAROLINA
FEBRUARY, 2002
E
cess
=` MAR 1 J
S A,o9 ' 7
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A. DENR - WATER QUALITY
///111GGG G E��o'�O FOiNT "OURCE BRANCH
Z4 fNlai� ate. "27
CAVANAUGH & ASSOCIATES, PConsulting Engineers
8064 North Point Boulevard, Suite 102 I
Winston-Salem, NC 27106 336/759-9001 Fax [phone]DENR - WATER DUALITY
www.cavanaughsolutions.com
POINT SOUR BRANCH

Pipe to
Barsreen
Q ave 0.39 Q peak 0.97
D 12 DA8/3 (ft) 1
n 0.009
s 0.005
d/D
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Q cfs
A/D
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0.01
0.0000
0.00
0.0013
0.00
0.00
0.02
0.0002
0.00
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0.00
0.63
0.03
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0.01
0.0069
0.01
0.85
0.04
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0.0105
0.01
1.00
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0.0147
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1.19
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0.0242
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0.08
0.0409
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0.11
0.0079
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0.0470
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1.97
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0.0095
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0.0534
0.05
2.08
0.13
0.0113
0.13
0.0600
0.06
2.20
0.14
0.0131
0.15
0.0668
0.07
2.30
0.15
0.0152
0.18
0.0739
0.07
2.41
0.16
0.0173
0.20
0.0810
0.08
2.50
0.17
0.0196
0.23
0.0885
0.09
2.59
0.18
0.0220
0.26
0.0961
0.10
2.68
0.19
0.0247
0.29
0.1039
0.10
2.78
0.2
0.0272
0.32
0.1118
0.11
2.85
0.21
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0.35
0.1199
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2.94
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0.23
0.0359
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0.0394
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3.18
0.25
0.0427
0.50
0.1535
0.15
3.26
0.26
0.0464
0.54
0.1623
0.16
3.35
0.27
0.0497
0.58
0.1711
0.17
3.40
0.28
0.0536
0.63
0.1800
0.18
3.49
0.29
0.0571
0.67
0.1890
0.19
3.54
0.3
0.0610
0.71
0.1982
0.20
3.60
0.31
0.0650
0.76
0.2074
0.21
3.67
0.32
0.0690
0.81
0.2167
0.22
3.73
0.33
0.0736
0.86
0.2260
0.23
3.81
0.34
0.0776
0.91
0.2355
0.24
3.86
0.35
0.0820
0.96
0.2450
025
192
0.36
0.0864
1.01
0.2546
0.25
3.97
0.37
0.0909
1.06
0.2642
0.26
4.03
0.38
0.0955
1.12
0.2739
0.27
4.08
0.39
0.1020
1.19
0.2836
0.28
4.21
0.4
0.1050
1.23
0.2934
0.29
4.19
0.41
0.1100
1.29
0.3032
0.30
4.25
0.42
0.1147
1.34
0.3132
0.31
4.29
0.43
0.1196
1.40
0.3229
0.32
4.34
0.44
0.1245
1.46
0.3328
0.33
4.38

0.45
0.1298
1.52
0.3428
0.34
4.43
0.46
0.1348
1.58
0.3527
0.35
4.47
0.47
0.1401
1.64
0.3627
0.36
4.52
0.48
0.1452
1.70
0.3727
0.37
4.56
0.49
0.1505
1.76
0.3827
0.38
4.60
0.5
0.1558
1.82
0.3927
0.39
4.64
0.51
0.1610
1.88
0.4027
0.40
4.68
0.52
0.1664
1.95
0.4127
0.41
4.72
0.53
0.1715
2.01
0.4227
0.42
4.75
0.54
0.1772
2.07
0.4327 1
0.43 1
4.79
0.55
0.1825
2.14
0.4426
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4.83
0.56
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0.57
0.1933
2.26
0.4625
0.46
4.89
0.58
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2.33
0.4723
0.47
4.93
0.59
0.2041
2.39
0.4822
0.48
4.96
0.6
0.2092
2.45
0.4920
0.49
4.98
0.61
0.2146
2.51
0.5018
0.50
5.01
0.62
0.2199
2.57
0.5115
0.51
5.03
0.63
0.2252
2.64
0.5212
0.52
5.06
0.64
0.2302
2.69
0.5308
0.53
5.08
0.65
0.2358
2.76
0.5404
0.54
5.11
0.66
0.2407
2.82
0.5499
0.55
5.12
0.67
0.2460
2.88
0.5594
0.56
5.15
0.68
0.2510
2.94
0.5687
0.57
5.17
0.69
0.2560
3.00
0.5780
0.58
5.18
0.7
0.2608
3.05
0.5872
0.59
5.20
0.71
0.2653
3.11
0.5964
0.60
5.21
0.72
0.2702
3.16
0.6054
0.61
5.22
0.73
0.2751
3.22
0.6143
0.61
5.24
0.74
0.2794
3.27
0.6231
0.62
5.25
0.75
0.2840
3.32
0.6318
0.63
5.26
0.76
0.2888
3.38
0.6404
0.64
5.28
0.77
0.2930
3.43
0.6489
0.65
5.29
0.78
0.2969
3.48
6.6573
0.66
5.29
0.79
0.3008
3.52
0.6655
0.67
5.29
0.8
0.3045
3.56
0.6736
0.67
5.29
0.81
0.3082
3.61
0.6815
0.68
5.29
0.82
0.3118
3.65
0.6893
0.69
5.30
0.83
0.3151
3.69
0.6969
0.70
5.29
0.84
0.3182
3.73
0.7043
0.70
5.29
0.85
0.3212
3.76
0.7115
0.71
5.28
0.86
0.3240
3.79
0.7186
0.72
5.28
0.87
0.3264
3.82
0.7254
0.73
5.27
0.88
0.3286
3.85
0.7320
0.73
5.26
0.89
0.3307
3.87
0.7380
0.74
5.25
0.9
0.3324
3.89
0.7445
0.74
5.23
0.91
0.3336
3.91
0.7504
0.75
5.20
0.92
0.3345
3.92
0.7560
0.76
5.18
0.93
0.3350
3.92
0.7612
0.76
5.15
0.94
0.3353
3.93
0.7662
0.77
5.12
0.95
0.3349
3.92
0.7707
0.77
5.09
0.96
0.3340
3.91
0.7749
0.77
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0.97
0.3322
3.89
0.7785
0.78
5.00
0.98
0.3291
3.85
0.7816
0.78
4.93
0.99
0.3248
3.80
0.7841
0.78
4.85
1
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3.65
0.7854
0.79
4.65

• S
0
CONSULTING ENGINEERS
ENVIRONMENTAL PROFESSIONALS
Cavanaugh & Associates, P.A.
We provide superior client service and environmentally sound
designs through integrity; communication and partnership.
LAND SURVEYORS - RALEIGH
DESIGN PROFESSIONALS
8064 North Point Boulevard, Suite 102 ♦ Winston-Salem, North Carolina 27106 ♦ 910/759-9001 ♦ Fax [phone]
705 Georgetown Road ♦ Post Office Box 18051 ♦ Raleigh, North Carolina 27619 ♦ 919/832-7704 ♦ Fax [phone]

e
0
CONSULTING ENGINEERS
ENVIRONMENTAL PROFESSIONALS
Cavanaugh & Associates, P.A.
We provide superior client service and environmentally sound
designs through integrh , communication and partnership.
LAND SURVEYORS - RALEIGH
DESIGN PROFESSIONALS
Project #
Sheet # y of
Computed Date
Checked Date
1
07
Ilk+ C� r -
� ti
8064 North Point Boulevard, Suite 102 ♦ Winston-Salem, North Carolina 27106 ♦ 910/759-9001 ♦ Fax [phone]
705 Georgetown Road ♦ Post Office Box 18051 ♦ Raleigh, North Carolina 27619 ♦ 919/832-7704 ♦ Fax [phone]

6
l
CONSULTING ENGINEERS
ENVERONMENTAL PROFESSIONALS
Cavanaugh & Associates, P.A.
We provide superior client service and environmentally sound
designs through integrity, communication and partnership.
LAND SURVEYORS - RALEIGH
DESIGN PROFESSIONALS
Project #
Sheet #_�� of
Computed Date
Checked Date
8064 North Point Boulevard, Suite 102 ♦ Winston-Salem, North Carolina 27106 ♦ 910/759-9001 ♦ Fax [phone]
705 Georgetown Road ♦ Post Office Box 18051 ♦ Raleigh, North Carolina 27619 ♦ 919/832-7704 ♦ Fax [phone]

a
Cavanaugh & Associates, P.A.
We provide superior client service and environmentally sound
designs through integrity, communication and partnership.
, 2A 40
-� Z . 401
8064 North Point Boulevard, Suite 102 ♦ Winston-Salem, North Carolina 27106 ♦ 910/759-9001 ♦ Fax [phone]
705 Georgetown Road ♦ Post Office Box 18051 ♦ Raleigh, North Carolina 27619 ♦ 919/832-7704 ♦ Fax [phone]

0
CONSULTING ENGINEERS
ENVIRONMENTAL PROFESSIONALS
Cavanaugh & Associates, P.A.
We provide superior client service and environmentally sound
designs through integrity; communication and partnership.
LAND SURVEYORS • RALEIGH
DESIGN PROFESSIONALS
Project #
Sheet # of
Computed Date
Checked Date
8064 North Point Boulevard, Suite 102 ♦ Winston-Salem, North Carolina 27106 ♦ 910/759-9001 ♦ Fax 910n59-1005
705 Georgetown Road ♦ Post Office Box 18051 ♦ Raleigh, North Carolina 27619 ♦ 919/832-7704 ♦ Fax [phone]

<I
APPENDix A. GEOMETRIC ELEMENTS FOR CIRCULAR CHANNEL SECTIONS
do = diameter
R - hydraulic radius
y = depth of flow
T - top width `
A = water area
D = hydraulic depth
P = wetter perimeter
Z - A N/_D = section factor for
critical -flow computation
v
do
A
doI
P_
do
R
do
T
do
D
do
Z
doo'o
ARss
d 45
0
0.01
0.0013
0.2003
0.0088
0.1990
0.0068
0.0001
0.0000
0.02
0.0037
0.2838
0.0132
0.2800
0.0134
0.0004
0.0002
0.03
0.0069
0.3482
0.0197
0.3412
0.0202
0.0010
0.0005
0.04
0.0105
0.4027
0.0262
0.3919
0.0268
0.0017
0.0009
0.05
0.0147
0.4510
0.0326
0.4359
0.0336
0.0027
0.0015
0.06
0.0192
0.4949
0.0389
0.4750
0.0406
0.0039
0.0022
0.07
0.0242
0.5355
0.0451
0.5103
0.0474
0.0053
0.0031
0.08
0.0294
0.5735
0.0513
0.5426
0.0542
0.0069
0.0040
0.09
0.0360
0.6094
0.0574
0.5724
0.0612
0.0087
0.0052
0.10
0.0409
0.6435
0.0635
0.6000
0.0682
0.0107
0.0065
0.11
0.0470
0.6761
0.0695
0.6258
0.0752
0.0129
0.0079
0.12
0.0534
0.7075
0.0754
0.6400
0.0822
0.0153
0.0095
0A3
0.0600
0.7377
0.0813
0.6726
0.0892
0.0179
0.0113
0.14
0.0668
0.7670
0.0871
0.6940
0.0964
0.0217
0.0131
0.15
0.0739
0.7954
0.0929
0.7141
0.1034
0.0238
0.0152
0.16
0.0811
0.8230
0.0986
0.7332
0.1106
0.0270
0.0173
0.17
0.0885
0.8500
0.1042
0.7513
0.1178
0.0304
0.0196
0.18
0.0961
0.8763
0.1097
0.7684
0.1252
0.0339
0.0220
0.19
0.1039
0.9020
0.1152
0.7846
0.1324
0.0378
0.0247
0.20
0.1118
0.9273
0.1206
0.8000
0.1398
0.0418
0.0273
0.21
0. 1199
0.9521
0.1259
0.8146
0.1472
0.0460
0.0301
0.22
0.1281
0.9764
0.1312
0.8285
0.1546
0.0503
0.0333
0.23
0.1365
1.0003
0.1364
0.8417
0.1622
0.0549
0.0359
0.24
0.1449
1.0239
0.1416
0.8542
0.1696
0.0597
0.0394
0.25
0.1535
1.0472
0.1466
0.8660
0.1774
0.0646
0.0427
0.26
0.1623
1.0701
0.1516
0.8773
0.1850
0.0697
0.0464
0.27
0.1711
1.0928
0.1566
0.8879
0.1926
0.0751
0.0497
0.28
0.1800
1.1152
0.1614
0.8980
0.2004
0.0805
0.0536
0.29
0.1890
1.1373
0.1662
0.0075
0.2084
0.0862
0.0571
0.30
0.1082
1. 1593
0.1709
0.9165 1
0.2162 1
0.0921 1
0.0610
DaD

UAU ArrEN DLXE13
APPENDIX A. GEOMETRIC ELEMENTS FOR CIRCULAR
CHANNEL. SECTIONS (continued)
U
do
A
do!
P
do
R
do
T
do
D
TO
Z
dos.a
ARO
dogs
0.31
0.2074
1.1810
0.1755
0.9250
0.2242
0.0981
0.0650
0.32
0.2167
1.2025
0.1801
0.9330
0.2322
0.1044
0.0690
0.33
0.2260
1.2230
0.1848
0.9404
0.2404
0.1107
0.0736
0.34
0.2355
1.2451
0.1891
0.9474
0.2486
0.1172
0.0776
0.35
0.2450
1.2661
0.1935
0.9539
0.2568
0.1241
0.0820
0.36
0.2546
1.2870
0.1978
0.9600
0.2652
0.1310
0.0864
0.37
0.2642
1.3078
0.2020
0.9656
0.2736
0.1381
0.0909
0.38
0.2739
1.3284
0.2061
0.9708
0.2822
0.1453
0.0955
0.39
0.2836
1.3400
0.2102
0.9755
0.2908
0.1528
0.1020
0.40
0.2934
1.3694
0.2142
0.9798
0.2994
0.1603
0.1050
0.41
0,3032
1.3898
0.2181
0.9837
0.3082
0.1682
0.1100
0.42
0.3132
1.4101
0.2220
0.0871
0.3172
0.1761
0.1147
0.43
0.3229
1.4303
0.2257
0.9902
0.3262
0.1844
0.1196
0.44
0.3328
1.4505
0.2294
0.0928
0.3352
0.1927
0.1245
0.45
0.3428
1.4706
0.2331
0.9950
0.3446
0.2011
0.1298
0.46
0.3527
1.4907
0.2366
0.9968
0.3538
0.2098
0.1348
0.47
0.3627
1.5108
0.2400
0.9982
0.3634
0.2186
0.1401
0.48
0.3727
1.5308
0.2434
0.9992
0.3730
0.2275
0.1452
0.49
0.3827
1.5508
0.2467
0.9998
0.3828
0.2366
0.1505
0.50
0.3927
1.5708
0.2500
1.0000
0.3928
0.2459
0.1558
0.51
0.4027
1.5908
0.2531
0.9998
0.4028
0.2553
0.1610
0.52
0.4127
1.6108
0.2561
0.9902
0.4130
0.2650
0.1664
0.53
0.4227
1.6308
0.2591
0.9982
0.4234
0.2748
0.1715
0.54
0.4327
1.6509
0.2620
0.9968
0.4340
0.2848
0.1772
0.55
0.4426
1.6710
0.2649
0.9950
0.4448
0.2949
0.1825
0.56
0.4526
1.6911
0.2676
0.9928
0.4558
0.3051
0.1878
0.57
0.4625
1.7113
0.2703
0.0902
0.4670
0.3158
0.1933
0.58
0.4723
1.7315
0.2728
0.9871
0.4786
0.3263
0.1987
0.59
0.4822
1.7518
0.2753
0.9837
0.4902
0.3373
0.2041
0.60
0.4920
1.7722
0.2776
0.9798
0.5022
0.3484
0.2092
0.61
0.5018
1.7926
0.2797
0.9755
0.5144
0.3560
0.2146
0.62
0.5115
1.8132
0.2818
0.9708
0.5270
0.3710
0.2199
0.63
0.5212
1.8338
0.2839
0.9656
0.5398
0.3830
0.2252
0.61
0.5308
1.8546
0.2860
0.9600
0.5530
0.3945
0.2302
0.65
0.5404
1.8755
0.2881
0.9539
0.5666
0.4066
0.2358
y
APPENDIX A
APPENDIX A. GEOMETRIC ELEMENTS FOR CIRCULAR
CHANNEL SECTIONS (continued)
627
b
Woo
_
A
702
P
do
R
do
T
do
0.9474
D
do
Z
A Ras
o
0.2401
0.66
0.5499
1.8965
0.2899
0.5804
0.4188
0.67
0.5594
1.9177
0.2917
0.9404
0.5948
0.4309
0.246(
0.68
0.5687
1.9391
0.2935
0.9330
0.6096
0.4437
0.25H
0.69
0.5780
1.9606
0.2950
0:9250
0.6250
0.4566
0.256(
0.70
0.5872
1.9823
0.2962
0.9165
0.6408
0.4694
0.260E
0.71
0.5964
2.0042
0.2973
0.9075
0.6572
0.4831
0.2653
0.72
0.6054
2.0264
0.2984
0.8980
0.6742
0.4964
0.2702
0.73
0.6143
2.0488
0.2995
0.8879
0.6918
0.5100
0.2751
0.74
0.6231
2.0714
0.3006
0.8773
0.7104
0.5248
0.2794
0.75
0.6318
2.0944
0.3017
0.8660
0.7296
0.5392
0.2840
0.76
0.6404
2.1176
0.3025
0.8542
0.7498
0.5540
0.2888
0.77
0.6489
2.1412
0.3032
0.8417
0.7710
0.5695
0.2930
0.78
0.6573
2.1652
0.3037
0.8285
0.7934
0.5850
0.2969
0.79
0.6655
2.1895
0.3040
0.8146
0.8170
0.6011
0.3008
0.80
0.6736
2.2143
0.3042
0.8000
0.8420
0.6177
0.3045
0.81
0.6815
2.2395
0.3044
0.7846
0.8686
0.6347
0.3082
0.82
0.6893
2.2653
0.3043
0.7684
0.8970
0.6524
0.3118
0.83
0.6969
2.2916
0.3041
0.7513
0.9276
0.6707
0.3151
0.84
0.7043
2.3186
0.3038
0.7332
0.9606
0.6897
0.3182
0.85
0.7115
2.3462
0.3033
0.7141
0.9964
0.7098
0.3212
0.86
0.7186
2.3746
0.3026
0.6940
1.0354
0.7307
0.3240
0.87
0.7254
2.4038
0.3017
0.6726
1.0794
0.7528
0.3264
0.89
0.7320
2.4341
0:3008
0.6499
1.1264
0.7754
0.3286
0.89
0.7380
2.4655
0.2996
0.6258
1.1800
0.8016
0.3307
0.90
0.7445
2.4981
0.2980
0.6000
1.2408
0.8285
0.3324
0.91
0.7504
2.5322
0.2963
0.5724
1.3110
0.8586
0.3336
0.92
0.7560
2.5681
0.2944
0.5426
1.3932
0.8917
0.3345
0.93
0.7612
2.6061
0.2022
0.5103
1.4918
0.9292
0.3350
0.94
0.7062
2.6467
0.2896
0.4750
1.6130
0.9725
0.3353
0.95
0.7707
2.6906
0.2864
0.4359
1.7682
1.0242
0.3349
0.96
0.7749
2.7389
0.2830
0.3910
1.0770
1.0888
0.3340
0.97
0.7785
2.7934
0.2787
0.3412
2.2820
1.1752
0.3322
0.98
0.7816
2.8578
0.2735
0.2800
2.7916
1.3050
0.3291
0•99
0.7841
2.9412
0.2665
0.1990
3.9400
1.5554
0.3248
1.00
0.7854
3.1416
0.2500
0.0000
00
00
0.3117

41; ell
CAVANAUGH
Solutions through integrity and partnership
Project #
Sheet # of
Designed by Date
Checked Date
PVA&=. �... . do
_ -
o,

Harmony Wastewater Treatment Facility Design Calculations
Design Assumptions
Average Daily Design Flow
250,000 gpd
Influent Waste Characteristics
BOD,
250 mg/L
TSS
NH,
260 - m g/L
35 mg/-
TKN
45 mg/L �
Effluent Limitations
Ile"
Q.° // 9.3 % ¢y -
BODs
30 mg/L
TSS
30 mg/L
Design Scheme: Facultative Lagoon => Constructed Wetland => UV Disinfection => Cascade Aeration => Discharge
Faculalive Lagoon Design Assumptions:
The lagoon depth needs to be > 5 It to achieve anaerobic conditions
The lagoon Is mechanically aerated and the aeration shall be limited to the first 3 ft
Mechanical aeration is based upon 21b 00b BODn.Hp-Hr. r
Anaerobic design 4.5lbs VS/1000 tt day
BOD5 loading for anaerobic treatment up to 250lb BOD,/1000 ft2-day (Use 50)
BODssiabllization rate = 75-95% (Removal efficiency)
BODa-_(,BRD, ° %Removal)
BOD., Jj - 8.34.250)
sz> - % Removal
BODa
Anaerobic Treatment Volume, y
BOO„/(50 In BOD,/1000 ft'-day)
Conversion of Treatment Volume to gals
Design Solids Retention Time
Anaerobic Volume (SRT•Vol)
Design Anaerobic Depth
Surface Area = Vol / 2f1
Square Dimension (top of anaerobic zone)
Square Dimension (bottom of anaerobic zone)
Aerobic Treatment Volume
Design Depth
Side Slopes (M:1)
Top Dimension
Square Dimension
Aerobic Volume
Hydraulic Retention Time (no rain or storm)
Lagoon Final Sizing
25-Yr, 24 hour rainfall event
Freeboard
Depth Total = Anaerobic a Aerobic i Rain r FB
Square Dimensions (top)
laplo&Aatdesign tmis7Wedand Designjftmon
521 lb/day -
50%'7. sr 90 o'Ja
-21` 6111b/day -
--
SF
/5,213 WitterI as non
39,D94 h2 or
198 ff. sq.
186 ft. sq.
Sit �-
3
54,626 tt2 or
234 ft, sq.
2.103,064 galssRerA
8 days
Freeboard - 2fl
3 C/
CAVANAUGH
Sdulionr III -II, integriq and parnmrzhip
e� 1
_8>3e>
aA ,&?7,col'O = 359,3-43 7N `A- !-s,15 I,
J(a 8/ d-ge > Y'/, 92/. & fe.2 >
6 in
2 11 i p
1051t1° 8 __
249 ft L s . 1.42 Acres - j.aol MG
° SuAso�ra lk �Rr)saoKt
0-0. 0%( JY! - P.D. 1
W• 1 1 rn L = 10.7 01 16
�'1 J to Y711J. Ga J1..2 r,(,c.a 0[
4v-)#P"tACI - '
7/1020DI

Harmony Wastewater Treatment Facility Design Calculations
Aeration Sizing
lb Oa/Ib BODn/day/Hp-Hr 2 00
Hp Required 130 Hp/Hr , ,I
Aerator Run Time .24 24 Hrs '10 — a Op al lA 0.�TN
Theoretical Aerator Sizing 5Hp
Selected Aerator Sizing _
Total Lagoon Volume 7 Hp
3,783.852 gals �0 Hp +4&1
Welland Sizing
TKN Design Loading Rate (5-151b N/Ac-day) ref Rice, Humenik NCSU —
TKN Design Loading Rate (l%8-18lbN/Ac-day) ref EPA
BODs Design Loading Rate (2-163Jb BODs/Ac-day) ref EPA
TSS Design Loading Rate (4.5-160lb TSS/Ac-day) ref EPA
Selected Loading Rates
TKN (lb N/Ac-day)
SOD, (lb BODS/Ac-day) 83 -
TSS (lb TSS/AI-day) 83
—_
Lagoon Removal Efficiencies -
TKN Lagoon Removal Efficiency 30%
BODS Lagoon Removal Efficiency 50% t="
TSS Lagoon Removal Efficiency 50% (ti
Remaining to be treated by Wetland (in •eflf
TKN WQJAk
BOD 66 Iblday e- 7r
TSS s 21 lb/day r_ lQ
261 lb/day
Welland Sizing Based on Design Loadings
TKN - 4"Planling Media
BODs 6.9 Acres.
TSS
3.1 Acres
3.1 Acres
Selected6.9 Acres
Design Widthidth (lop) 100 8
Design Bottom (lop) B8 it
Sidesteps (M:1) 3
Maximum Water Depth 12 in
Number of Cells 2
Required Length Per Cell 1602
'e.td-ign W.M.O.nd DesignWmmony
P.a.2
Weiland Cells -
Welland Calls
CAVANAUGH -
S.Ivdons Ihmugh imcgrfry and pennersidp
Welland Pl.ntings 3'sp.
r-6-8" Water Icvel
.OF-
3
Designed Impervious Liner

CAVANAU
Solutions through integrity and partnership
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CAVANAUGH
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CAVANAUGH
Solutions through integrity and partnership
Project #
Sheet # Iz- of �—
Designed by Date
Checked Date
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0
SPECIFICATION
FOR
Wt TROJAN UV3000 - PACKAGE TREATMENT PLANT (PTP)
ULTRAVIOLET DISINFECTION SYSTEM
PATENT NUMBERS ARE:
6,006,244
41872,980
4,482,809
1,163,086
1,327,877
29174,989
0,008,780B1
0,361,579B1
Other Patents Pending
MODEL NO. 3700K
Copyright 8 1994 by Trojan Technologies Inc., London, Ontario. Canada. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means without written permission of Trojan Technologies Inc.
UV3000 - PTP, JUNE 22, 1994
3700S.DQC , Page 1

m
Trojan System UV3000'9 - PTP Standard Specification
ULTRAVIOLET DISINFECTION EQUIPMENT
PART 1 - GENERAL
1.1 DESCRIPTION
A. Scope:
Furnish all labor, materials, equipment and appurtenances required to provide an open channel
gravity flow ultraviolet (UV) disinfection system. To be complete and operational with all control
equipment and accessories as shown and specified.
B. Related Work (Specified Elsewhere):
1. Section Cast -in -Place Concrete.
2. Section Anchor Bolts, Expansion Anchors
and Concrete Inserts.
3. Section Electrical.
1.2 QUALITY ASSURANCE
Vi
A. Manufacturer Qualifications:
1. Provide equipment which is a standard product of the manufacturer.
2. To be qualified, the UV manufacturer must provide documentation on at least three of its
wastewater disinfection systems. The lamps are to be parallel to the flow, in a uniform
array, and in an open channel, as shall be furnished on this project.
B. Prequaliflcation Requirements:
Demonstrate that the dose required in the performance specification is being met or
exceeded in an effluent at 50 degrees Fahrenheit. The UV equipment manufacturer will
provide both an EPA and a bioassay calculation. The bioassay calculation, as the name
implies, shall be based on an independently produced bioassay report on the proposed
UV equipment. The bioassay calculation shall be conducted at the full scale system's per
lamp flow. Both the EPA and bioassay calculations shall demonstrate that the proposed
UV system design will deliver the intended dose.
In order to verify the lamp output assumption made in the EPA calculation, the UV
equipment manufacturer shall provide a UV Lamp Output Graph. This UV output graph
shall be verified by an independent agency. The proposed electronic ballast for the full
scale system shall be calibrated against the Jefferson 60 Hz electromagnetic ballast,
Model Number 300-2171-650, and shall have a minimum operating current of 425 mA.
The curve shall show the output of the identical lamp individually being driven by both
ballasts, while immersed in a liquid over the operating temperature range of 40 to 100
degrees Fahrenheit. The most recent radiometer calibration documentation, as used in
the test procedure, and a complete procedural description shall be supplied with the
calculations.
The Engineer shall reserve the right to require that the test be modified and repeated if
the protocol used is not satisfactory.
C. Design Criteria:
1. Provide equipment which shall disinfect an effluent with the following characteristics:
a. Peak Flow GPD: 700,000
b. Total Suspended Solids mg/I: 30 (30 day average; grab sample)
C. Ultraviolet Transmittance @ 253.7 nm: 65
d. Annual Effluent Temperature Range: to EF
e. Effluent standards to be achieved: 200 /100 ML FC, based on a 30 day
geometric mean of daily samples
Copyright 8 1994 by Trojan Technologies Inc., London, Ontario, Canada. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means without written permission of Trojan Technologies Inc.
UV3000 - PTP, JUNE 22, 1994
3700S.DOC , Page 2

m
2. The UV equipment shall be installed in a fabricated stainless steel channel furnished as
part of this system, and having dimensions as shown on the plans.
3. The system supplied shall be arranged in the following manner.
a. Number of Lamps in each UV Lamp Module: 4
b. Number of UV Lamp Modules: 7
C. Number of UV Banks: 1
4. The lamp array configuration shall be evenly spaced in both horizontal and vertical rows
with all lamps parallel to each other and to the effluent flow.
D. Performance Requirements:
The UV dose produced by the system shall not be less than _ 28,000 µWatt.secs/cM2 after one
year (8760 hours) of lamp operation. To be measured in an effluent with a 65 % UV
transmission at 253.7 nm. Lamp output to be at 65% of its initial level, after one-year of operation,
and there shall be no fouling on the lamp sleeves.
1.3 SUBMITTALS
A. Shop Drawings:
1. Submit for review shop drawings showing the following:
a. Complete description in sufficient detail to permit an item comparison with the
specification.
b. Dimensions and installation requirements.
C. Descriptive information including catalog cuts and manufacturers specifications
for all components.
2. Electrical schematics and layouts.
B. Experience documentation.
PART 2 - PRODUCTS
2.1 MANUFACTURER
Trojan Technologies, Inc. of London, Ontario, Canada.
2.2 GENERAL REQUIREMENTS
A. Provide a UV disinfection system complete with UV lamp modules and channel with level control,
as shown on the Contract Drawings and as herein specified. System may also utilize a Monitoring
System. See under 2.4 OPTIONAL EQUIPMENT.
B. The installation contractor shall be responsible for supplying electrical power to each module and
providing sufficient electrical outdoor receptacles. The receptacles to be rated for continuous
operation of the UV lamp modules. The contractor is also to provide Ground fault interrupter
protection from the power source. Contractor may also opt to utilize optional Power Distribution
Receptacles specifically designed for this application. See under 2.4 OPTIONAL EQUIPMENT.
2.3 DESIGN, CONSTRUCTION AND MATERIALS
A. General:
1. All material in contact with effluent shall be stainless steel or quartz.
2. All wiring exposed to UV light shall be teflon coated.
3. All material exposed to UV light shall be stainless steel, anodized aluminum, quartz 214,
or teflon.
Copyright 8 1994 by Trojan Technologies Inc., London, Ontario, Canada. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means without written permission of Trojan Technologies Inc.
UV3000 - PTP, JUNE 22, 1994
3700S.DOC , Page 3

B. UV Module (UVM):
1. Each UV lamp module shall consist of 4 lamps and their corresponding electronic
ballast. Each lamp shall be enclosed in its individual quartz sleeve, one end of which
shall be closed and the other end sealed by a lamp end seal and holder.
2. The electrical wires connecting the lamps and electronic ballasts shall be enclosed in the
stainless steel frame and not exposed to the effluent.
3. Each UV module shall be provided with a standard 120 volt plug and weatherproof cable
for connection to a receptacle. The cable shall be no longer than 10 feet. A total of 7
UV modules shall be supplied. Lamp status shall be displayed on top of each UV module
by watertight LED indicator lights.
4. Modules shall be approximately 68.1 inches long, 20 inches high and 2.8 inches wide,
weighing approximately 38 lbs. Materials of construction shall be stainless steel type
316, anodized aluminum, quartz 214, and teflon.
C. UV Lamps:
1. Low pressure mercury slimline lamps of the hot cathode, instant start design. The coiled
filamentary cathodes to be heated by the current.
2. 90% of UV output shall be within the wavelengths of 233.7 to 273.7 rim.
3. The operating life of the lamp shall be guaranteed for a period of one year by the UV
system manufacturer.
D. Lamp End Seal and Lamp Holder:
1. The open end of the lamp sleeve shall be sealed by means of a sleeve nut which threads
onto a sleeve cup and compresses the sleeve 'O' ring.
2. The sleeve nut shall have a knurled surface to allow a positive hand grip for tightening.
The sleeve nut shall not require any tools for removal.
E. UV Lamp Sleeves:
1. Type 214 clear fused quartz circular tubing as manufactured by General Electric or equal.
2. Rated for UV transmission of 89% and shall not be subject to solarization.
3. The nominal wall thickness shall be 1.0 to 2.0 mm.
F. Effluent Channel:
1. Each unit shall be provided with one (1) stainless steel 304, 14 gauge effluent channel
complete with drain, UV module support rack and downstream serpentine weir.
2. Each effluent channel shall have the following inside dimensions: Length 115 inches,
width 21 inches, height 21 inches.
G. Level Control Weir:
1. Weir shall be placed downstream of the UV module in the channel so as to maintain an
average water depth of 12 inches.
2. Maximum effluent level variance from zero to peak flow shall be no greater than 1 1/2
inches.
3. Weir shall be welded water tight.
4. Minimum crest length shall be 119.87 inches.
H. Electrical:
1. The UV disinfection system shall be divided into 7 UV modules.
2. Interconnecting Cables to be standard 120 volt, weatherproof, 10 feet long
3. Receptacles:
a. 120 volt receptacles rated for continuous outdoor use shall be used. Receptacles
shall be of the duplex type complete with ground fault interruptor circuitry.
b. Receptacles to be provided by Contractor unless Engineer elects to have the UV
Manufacturer supply Power Distribution Receptacles under Item C of Section 2.4
OPTIONAL EQUIPMENT.
Copyright 8 1994 by Trojan Technologies Inc., London, Ontario, Canada. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means without written permission of Trojan Technologies Inc.
UV3000 - PTP, JUNE 22, 1994
3700S.DOC , Page 4

4. Power Consumption:
a. Maximum power draw to UV System shall be 2450 watts.
b. All electrical supplies shall be 120 volt, 60 Hz.
C. Separate 120 volt, 15 amp, supplies may be required if a Monitoring System is
selected under Section 2.4 OPTIONAL EQUIPMENT.
I. Cleaning Procedure:
The UV lamp modules shall be cleaned by removing from the effluent channel and hand wiping
the sleeves with an acid solution, using a non-abrasive cloth.
2.4 OPTIONAL EQUIPMENT Note to specifier: Select OPTIONAL EQUIPMENT as required.
A. Monitoring System:
1. A submersible UV sensor shall continuously monitor the UV intensity produced in the
bank of UV lamp modules. The sensor shall measure only the germicidal portion of the
light emitted by the UV lamps.
2. UV intensity (mW/sq.cm) to be indicated on a three (3) character display.
3. Elapsed time (hours) to be indicated on a five (5) character display.
r 4. Both displays to utilize seven (7) segment LEDs and be visible through the panel door.
5. A dry contact shall be provided for Low UV intensity alarm.
6. Alarm shall be time delayed to prevent a nuisance alarm and shall be field adjustable.
7. Monitoring System shall be enclosed in a fiberglass NEMA 4X wall mounted panel.
C. Power Distribution Receptacle (PDR):
Duplex ground fault interrupter receptacle(s) shall be provided. Each PDR to have an individual,
painted cast aluminum junction box complete with a NEMA 3R rain shield.
Contractor to supply appropriate 120V, single phase, 60 Hz circuit to the UV system. Contractor
to be responsible for distributing the power from the main 120V feed to the individual PDRs.
Responsibility to be all encompassing and in accordance with the local electrical codes.
D. Transition Connections:
Inlet and outlet transition connections shall be supplied. Transition boxes change channel
connection from a square flange to a round flange conforming to ANSI standards. The material
used for these parts will be stainless steel type 304, 14 gauge, manufactured as per dimensions
indicated in accompanying diagrams.
E. Spare Parts:
The following spare parts shall be furnished:
Four (4) UV Lamps
Four (4) Lamp Sleeves
Four (4) Lamp Holders
F. Operators Kit: The following items shall be furnished:
One (1) face shield to protect the operator from UV light.
One (1) Gallon of Cleaning Solution. Lime -A -Way manufactured by Ecolab.
PART 3 - EXECUTION
3.1 INSTALLATION
In accordance with Drawings, shop drawings and manufacturer's instructions.
3.2 MANUFACTURER'S REPRESENTATIVE'S SERVICES
As specified.
Copyright 8 1994 by Trojan Technologies Inc., London, Ontario, Canada. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means without written permission of Trojan Technologies Inc.
UV3000 - PTP, JUNE 22, 1994
3700S.DOC , Page 5

0
e
a
r
CONSULTING ENGINEERS
ENVIRONMENTAL PROFESSIONALS
Cavanaugh & Associates, P.A.
We provide superior client senlice and environmentally sound
designs through integrity; communication and partnership.
LAND SURVEYORS - RALEIGH
DESIGN PROFESSIONALS
8064 North Point Boulevard, Suite 102 ♦ Winston-Salem, North Carolina 27106 ♦ 910/759-9001 ♦ Fax [phone]
705 Georgetown Road ♦ Post Office Box 18051 ♦ Raleigh, North Carolina 27619 ♦ 919/832-7704 ♦ Fax [phone]

e
CASCADE AERATION CALCULATIONS
A
o•
ENTER TEMPERATURE (CENTIGRADE)? 20
ENTER D.O. SATURATION CONCENTRATION AT THIS WATER TEMPERATURE
AND LOCATION ALTITUDE (MG/L)? 8.5
ENTER D.O. CONCENTRATION OF INFLUENT TO CASCADE (MG/L)? 0
ENTER DESIRED D.O. CONCENTRATION AFTER AERATION (MG/L)? 5.0
OXYGEN DEFICIT RATIO = 2.428571
ENTER GEOMETRY PARAMETER (WEIR-1.0; STEPS-1.1; STEP WEIR-1.3)? 1.3
CASCADE HEIGHT (FT) = 6.503913
TRY DIFFERENT GEOMETRY (YIN)? Y
ENTER GEOMETRY PARAMETER (WEIR-1.0; STEPS-1.1; STEP WEIR-1.3)? 1.1
s
CASCADE HEIGHT (FT) = 7.686442
TRY DIFFERENT GEOMETRY (Y/N)?

CASCADE AERATION CALCULATIONS
ENTER TEMPERATURE (CENTIGRADE)? 20
ENTER D.O. SATURATION CONCENTRATION AT THIS WATER TEMPERATURE
AND LOCATION ALTITUDE (MG/L)? 8.5
ENTER D.O. CONCENTRATION OF INFLUENT TO CASCADE (MG/L)? 0
ENTER DESIRED D.O. CONCENTRATION AFTER AERATION (MG/L)? 5.0
OXYGEN DEFICIT RATIO = 2.428571
ENTER GEOMETRY PARAMETER (WEIR-1.0; STEPS-1.1; STEP WEIR-1.3)? 1.3
CASCADE HEIGHT (FT) = 6.503913
TRY DIFFERENT GEOMETRY (YIN)?

I.
DISSOLVED OXYGEN SOLUBILITY CHART
TEMPERATURE OXYGEN SOLUBILITY (mg/1)
=F
T Coro
1.024
SEA
LEVEL
1000 I 2000
ft. ft.
3000 4000 5000
ft. ft. ft.
32.0 0 0.621
14.6
14.1 13.6 i 13.1 I 12.6 12.1
35.6 2 0.653
13.8
13.3 12.8 I 12.4 11.9 i 11.5
39.2 4 0.684
13.1
12.6 I 12.2 I 11.8
I 11.4 10.9
42.8 1 6 0.717 12.5
12.0
11.6 11.2
I 10.8 10.4
46.4 8 0.752 11.9
11.4
11.0 10.6
I 10.2 9.9
50.0 10 0.789 11.3
10.9
10.5
I 10.1
i 9.8
j 9.4
53.6 12 0.827 10.8
10.4
10.1
9.7
9.4
9.0
57.2 14 0.867 10.4
10.0
I 9.6 I
9.3
i 8.9
I 8.6
60.8 16 0.909 10.0
9.6
9.2
8.9
8.6
8.3
64.4 18 0.954 9.5
9.2
8.9
8.5
8.2
7.9
68.0 20 1.000 9.2
8.6
8.5
8.2
1 7.9
i 7.6
71.6 22 1.049 8.8
8.5
I 8.2
7.9
7.6
I 7.3
75.2 24 1.100 8.5
8.2
7.9
7.6
7.3
7.1
78.8 26 1.153 8.2
7.9
7.6
7.3
7.1
6.8
82.4 28 1.209 7.9
7.6
7.4
7.1 1
6.8 I
6.6
86.0 30 1.268 7.6
7.4
7.1
6.9
6.6
6.4
89.6 32 1.329 7.4
7.1
6.9
6.6
6.4
6.2
93.2 34 1.394 7.2
6.9
6.7
6.4
6.2
6.0
96.8 36 1.460 7.0
6.7
6.5
6.3
6.0
5.8
100.4 38 1.532 6.8
6.6
6.3
6.1
5.9
5.6
104.0 40 1.600 6.6
6.4
6.1
5.9
5.7
5.5

TOWN OF HARMONY
CONSTRUCTED WETLANDS WASTEWATER TREATMENT FACILITY
SCHEMATIC
INFLUENT METERING MANHOLE
XL 60' V TRAPEZOIDAL FLUME
MANUAL BAR SCREEN
V— 11" WIDE
112" BARS ® 1" O.C.
FACULATATIVE LAGOON
10 — 2 HP ASPIRATING AERATORS
528,953 CF VOLUME
SHALLOW ROOTED WETLAND CELLS
CELL 1 LENGTH = 1,676 FT
CELL 2 LENGTH = 1,815 LF
8'X1
5' DEE
ULTRAVIOLET DISII
PACAKGE UNIT
7 MODULES — 28
fI
i
OUA�Ir
"I',-
EN',- OUBCE BRAN
POINT � O
9 STEP CASECADE AERATOR
�n
�D 0
a Z
0
EFFLUENT METERING MANHOLE s D
XL 60' V TRAPEZOIDAL FLUME = C
a
UJ
DUTCHMAN'S CREEK I

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Gregory J. Thorpe, Ph.D. Acting Director
March 15, 2002
Ms. Lisa Alley, P.E.
Cavanaugh `ce? Associates, P.A.
8064 North Point Boulevard, Suite 102
Winston-Salem, North Carolina 27106
ATY•
air
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: NPDES Permit #NC0087035
Authorization to Construct Return
Return #2149
Town of Harmony WWTP
Iredell County
Dear Ms. Alley:
Per our conversation and your request. the Division of Water Quality is hereby returning the attached
Authorization to Construct request received on March 14, 2002. After a preliminary review, the
Division has determined that the request package lacks the following items:
♦ Three (5) sets of design specifications (signed and sealed by a NC Professional Engineer)
♦ Three (3) sets of design calculations (signed and sealed by a NC Professional Engineer)
♦ One letter from the Town of Harmony designating Cavanaugh act? Associates as a duly
authorized representative.
If you have any questions about the NPDES Authorization to Construct process, please contact Christie
Jackson at telephone number [phone], extension 558.
Sincerely,
_�r- David A. Goodrich
NPDES Unit Supervisor
cc: Central Files
NPDES Unit, Permit File
Mooresville Regional Office, Water Quality
Mayor John Ray Campbell - Town of Harmony
P.O. Box 118
Harmony, NC 28654
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 - Telephone [phone]/FAX [phone]
An Equal Opportunity Affirmative Action Employer - 50%recycled/ 10% post -consumer paper

c
v
CAVANAUGH
Solutions through integrity and partnership
March 5, 2002
Mr. Dave Goodrich, NPDES Unit SupervisorFT:
NPDES Group, Water Quality Section 2�p2
NC DENR DWQ NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617 p HR WAaC BRANDA
pOl�j SJtSRCE BfZA
Re.: Harmony Wastewater Treatment Plant
C&A No.: HM9901 ..
Dear Mr. Goodrich:
On behalf of the Town of Harmony, Cavanaugh & Associates, P.A. now submits the formal
request for an Authorization to Construct a 250,000 gallon per day Constructed Wetlands
Wastewater Treatment Plant to serve the town of Harmony. The Town has received funding for
the project from USDA Rural Development and The Rural Center. This proposed wastewater
treatment facility was issued NPDES Permit No. NC0087033 on November 15, 2001.
Components to be constructed include:
• Metering manhole for influent flow measurement and sampling
• Manual bar screen
• Facultative lagoon with ten 2 horsepower aerators
• Splitter box
• Parallel shallow rooted plant wetland cells
• Polishing sand filter
• Ultraviolet disinfection unit
• Cascade aerator
• Metering manhole for effluent flow measurement and sampling.
The following items are included in this packet for your review:
1. Three sets of detailed plans with specifications for the site work.
2. Two copies of a Flow Schematic and major component information.
3. Two sets of design calculations.
We hope that you will find everything in order for your review of this - request. Upon receiving
your approval, we anticipate 60 days will be needed for securing the Town's construction
contract. The construction period is estimated to last 365 days.

y
r M
Mr. David Goodrich
Harmony Wastewater Treatment Plant
C&A No.: HM9901
March 5, 2002
Page Two
Upon receipt of this submission package, if you have any questions or require additional
information, please do not hesitate to contact me by telephone at 336/759-9001 or by e-mail at
[e-mail].
Sincerely,
CAVANAUGH & ASSOCIATES, P.A.
Lisa Alley, P.E
nn!ti S
Enclosures ?tj
0 SOURCE BRANCH
PO
cc: Mayor John Ray Campbell, Town of Harmony