WQ0031246_Modification_20221205

Initial Review
Reviewer Thornburg, Nathaniel D
Is this submittal an application? (Excluding additional information.)*
Yes No
Permit Number (IR) * WQ0031246
Applicant/Permittee Riversound Property Owners Association, Inc
Applicant/Permittee Address P.O. Box 572, Edenton, NC 27932
Is the owner in BIMS? Yes No Is the facility in BIMS?
Owner Type
Facility Name
County
Fee Category
Is this a complete application?*
Yes No
Signature Authority
Signature Authority Title
Signature Authority Email
Document Type (if non -application)
Email Notifications
Organization
Riversound WWTP
Does this need review by the hydrogeologist? * Yes No
Regional Office
CO Reviewer
Admin Reviewer
llr�ore
Fee Amount $395
Complete App Date 12/05/2022
Below list any additional email address that need notification about a new project.
... ... ..
Email Address
Comments to be added to email notfication
Comments for Admin
Comments for RO

Comments for Reviewer
Comments for Applicant

Submittal Form
Project Contact Information
Please provide information on the person to be contacted by NDB Staff regarding electronic submittal, confirmation of receipt, and other correspondence.
............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Name* Joseph Anlauf, PE
Email Address*
[e-mail]
Project Information
Application/Document Type*
New (Fee Required)
Modification - Major (Fee Required)
Renewal with Major Modification (Fee
Required)
Annual Report
Additional Information
Other
Phone Number*
[phone]
Modification - Minor
Renewal
GW-59, NDMR, NDMLR, NDAR-1,
N DAR-2
Residual Annual Report
Change of Ownership
We no longer accept these monitoring reports through this portal. Please click on the link below and it will take you to the correct form.
hftps://edocs.deq.nc.gov/Forms/NonDischarge_Monitoring_Report
Perm it Type:*
Wastewater Irrigation
High -Rate Infiltration
Other Wastewater
Reclaimed Water
Closed -Loop Recycle
Residuals
Single -Family Residence Wastewater
Other
Irrigation
Permit Number: *
WQ0031246
Has Current Existing permit number
Applicant/Permittee*
Riversound Property Owners Association, Inc.
Applicant/Permittee Address*
P.O. Box 572, Edenton, NC 27932
Facility Name*
Riversound WWTP
Please provide comments/notes on your current submittal below.
The following documents are being sent in response to a Request for Additional Information
dated August 5, 2022. Thank you.
At this time, paper copies are no longer required. If you have any questions about what is required, please contact Nathaniel Thornburg
at [e-mail].
Please attach all information required or requested for this submittal to be reviewed here. *
(Application Form, Engineering Plans, Specifications, Calculations, Etc.)
Riversound Complete Application Documents.pdf 32.42MB
Upload only 1 PDF document (less than 250 MB). Multiple documents must be combined into one PDF file unless file is larger
than upload limit.
* By checking this box, I acknowledge that I understand the application will not be
accepted for pre -review until the fee (if required) has been received by the Non -
Discharge Branch. Application fees must be submitted by check or money order and
made payable to the North Carolina Department of Environmental Quality (NCDEQ).
I also confirm that the uploaded document is a single PDF with all parts of the
application in correct order (as specified by the application).
Mail payment to:
NCDEQ — Division of Water Resources
Attn: Non -Discharge Branch
1617 Mail Service Center
Raleigh, NC 27699-1617
Signature r�

Submission Date 12/5/2022

Joseph J. Anlauf, P.E.
Firm License P-0929
July 5, 2022
Mr. Randy Sipe
NCDEQ, Division of Water Resources
Washington Regional Office
943 Washington Square Mall
Washington, NC 27889
Re: Application for Major Permit Modification
Riversound Wastewater Treatment Plant
Edenton, Chowan County, North Carolina
Dear Randy,
Phase 1 of the Riversound Subdivision located in Chowan County is comprised of 225 single
family residential lots and one (1) small restroom building by the resident boat ramp. When the
developer became insolvent due to the housing market crash of 2007 the installation of
improvements stopped with only portions of the subdivision infrastructure complete. Starting in
2015 we worked as a team to determine what wastewater infrastructure was in place and over
time restored that plant configuration to an operational status. This restoration process was
spurred on by the need for the Wastewater Treatment and Disposal Facility to be deemed
operational so that Chowan County could issue the first couple of building permits for actual
homes to go into the subdivision. From 2007 to some point in 2018 there were no homes and no
wastewater generated. The idea the more homes would follow the original two (2) homes never
came to fruition and the flow remains at a couple of hundred gallons per day.
Phase 1 of the Riversound subdivision is served by a membrane bioreactor (MBR) wastewater
treatment plant (WWTP). The Biological Treatment Unit (BTU), which has a treatment capacity
of 50,000 gpd, is the limiting factor in total treatment capacity today. Other portions of the plant
such as the Headworks, Flow Equalization Tanks and Digester are design for the wastewater flow
at full build out (81,000 gpd). The process calculations for the BTU indicate that this plant must
have an average daily flow of 6,000 gpd in order to maintain the biomass within the BTU to
achieve the treatment objectives and to generate compliant effluent. With only two (2) houses in
the subdivision, one of which is only occupied during weekends and holidays, this system is a
long way away from generating flow tributary to the plant at the minimum plant threshold.
Although several new homes are projected to be constructed in the near future this will still leave
the flow tributary to the plant at far less than 6,000 gpd average daily flow.
The Disposal method for this facility is a single High Rate Infiltration Basin (HRIB). The HRIB
is surrounded by 23 vertical wells designed to mechanically lower the groundwater table and so
that the HRIB itself falls within the cones of influence of this well system. When treated effluent
is added to the HRIB space is available for the volume of water introduced to the basin due to the
influence of the perimeter well system. Construction techniques used at the time of the HRIB
installation were flawed and soils with low hydraulic conductivities were comingled with soils of
higher conductivities. In situ testing by Ed Andrews, NCLSS, PG in 2014 determined that the
performance of the basin was compromised by the comingling of the soils. Ed's report indicates
that at the time of his testing the basin could only handle 64,000 gpd of treated effluent which is
4721 W. Eckner St., Kitty Hawk, North Carolina [phone]

Joseph J. Anlauf, P.E.
Firm License P-0929
less than the projected flow at full build out which is approximately 81,000 gpd. Without the
ability to maintain the pond bottom performance over time is expected to decline.
The WWTP is an advanced treatment system with biological nutrient removal as a treatment goal.
The biological treatment goals in this case are the significant removal of Total Nitrogen (TN) and
Total Phosphorous (TP). Due to the proximity of the perimeter well system these goals are a TN
of 4 mg/1 and TP of 2 mg/l. This enhanced effluent limit is required when the perimeter well
system is located less than 100 feet from the HRIB. The limit of 4 mg/1 TN and 2 mg/1 TP can be
challenging to meet in a municipal plant with average daily flows within the design range of the
plant but are not possible for a plant that has a design flow significantly less than the design flow
range of the plant and certainly less than the minimum flow necessary to achieve appreciable
biomass.
It appears that low average daily flows will not overwhelm the HRIB if the mechanized perimeter
well system is taken out of service. If the wells are not in service then the horizontal setback
reduction is not needed and the effluent limits can be the normal statutory limits without TN and
TP limits. This concept was discussed in our conference call with the NCDEQ staff in Raleigh
back on 4/1/22. This allows us to design and permit a temporary treatment operation using more
standardized equipment to achieve the effluent limits. We propose to shut down the perimeter
well system during the use of the interim wastewater treatment system.
This Major Permit Modification is for the installation of a smaller attached growth packaged
treatment facility designed to manage the lower flows until the flow tributary to the plant meets
the minimum threshold necessary to expect the MBR to perform to the effluent limits of the
original permit. The equipment proposed is the Orenco AX-Max treatment unit. Phase one of the
proposed interim treatment facility would have a treatment capacity of 3,350 gpd.
The treatment train configuration would be as follows:
• Influent would pass through the mechanized screen which is part of the existing
headworks and is positioned over the Flow Equalization Tank (FEQ);
• The FEQ tank, design for flow at full build out, will be used to store the screened
influent;
• The existing FEQ pumps will be utilized to move wastewater forward into the AX-Max
unit;
• The AX-Max unit will treat the wastewater;
• Effluent from the AX-Max unit will be sent to UV disinfection units which will be
positioned in a proposed shed;
• Treated effluent will be sent to the HRIB via a forcemain;
• The AX-Max Anoxic Return line will be routed back to the FEQ tank where the influent
is rich in carbon which is necessary as a food source for the microbes involved in the
denitrification process;
• The system will have two (2) chemical feed systems: Carbon and Alkalinity. Alkalinity
will be introduced back into the FEQ tank to help support the proper pH for the
denitrifiers.
• All equipment will be set on the existing slab, all plumbing (with the exception of the
treated effluent forcemain to the HRIB) will be routed above ground to match the existing
piping and all piping will be insulated and wrapped in heat tape;
4721 W. Eckner St., Kitty Hawk, North Carolina [phone]

Joseph J. Anlauf, P.E.
Firm License P-0929
The Digester, BTU, Mechanical and Control Building and Blower building will be taken
off line;
The new system will be controlled independently by a new set of Orenco controls, the
existing control system will be shut down until the MBR inflow requirements are met and
this system is put back into service.
At this time we are only permitting the first phase of this temporary or interim operational
configuration. The plans indicate the possible inclusion of two (2) additional phases each having
a capacity of 3,350 gpd. This phased approach allows us to evaluate the performance of the
system and the growth of development within the subdivision before moving forward with the
permitting of additional phases. The total design flow for all three (3) of the proposed phases
would be just over 10,000 gpd.
Please find attached the following items:
1. One (1) application
2. One (1) check in the amount of $395 made payable to the NCDEQ.
3. Three (3) copies of the plans (24" x 36")
4. Three (3) copies of the plans (11" x 17")
The application contains much of the necessary details regarding the equipment proposed to be
used in this interim system. Many parts of the application have not be completed and have been
considered "not applicable" due to the fact that either the information is already on file with the
State or no changes to a particular part of the system are being proposed.
Please review and approve the attached information. Please contact me with questions at
[phone].
Sincerely,
Anlauf Engineering, PLLC
Joseph J. Anlauf, PE
Encl.: as stated
Cc: Ed Kiley, Vice President, Riversound HOA, Inc.
4721 W. Eckner St., Kitty Hawk, North Carolina [phone]

State of North Carolina
Department of Environmental Quality
DWR Division of Water Resources
15A NCAC 02T .0700 — HIGH -RATE INFILTRATION SYSTEMS
Division of Water Resources FORM: HRIS 06-16
I. APPLICANT INFORMATION:
1.
Applicant's name: Riversound Property Owners Association, Inc.
2.
Applicant type: ❑ Individual ® Corporation ❑ General Partnership
❑ Privately -Owned Public Utility
❑ Federal ❑ State ❑ Municipal
❑ County
3.
Signature authority's name: Ed Kite v per 15A NCAC 02T .0106(b)
Title: President
4.
Applicant's mailing address: P.O. Box 572
City: Edenton State: NC Zip: 27932-
5.
Applicant's contact information:
Phone number: [phone] Email Address: [e-mail]
II. FACILITY INFORMATION:
1.
Facility name: Riversound WWTP
2.
Facility status: Existing
3.
Facility type: Major (> 10,000 GPD or > 300 disposal acres)
4.
Facility's physical address: 185 Riversound Drive
City: Edenton State: NC Zip: 27932- County: Chowan
5.
Wastewater Treatment Facility Coordinates (Decimal Degrees): Latitude:
Longitude: - °
Datum: Select Level of accuracy: Select Method of measurement: Select
6.
USGS Map Name:
III. CONSULTANT INFORMATION:
1. Professional Engineer: Joseph J. Anlauf, PE
PLLC
Mailing address: 4721 W Eckner St
License Number: PE026980 Firm: Anlauf Engineering,
City: Kitty Hawk State: NC Zip: 27949-5910
Phone number: [phone] Email Address: jjanlauagmail.com
2. Soil Scientist: N/A License Number: Firm:
Mailing address:
City: State:
Zip: -
Phone number: (_) _-
Email Address: _
3. Geologist: N/A
License Number:
Mailing address:
City: State:
Zip: -
Phone number: (_) _-
Email Address: _
4. Agronomist: N/A
Firm:
Mailing address:
City: State:
Zip: -
Phone number: (_) _-
Email Address: _
Firm:
FORM: 1IRIS 06-16 Page I of I3

IV. GENERAL REQUIREMENTS —15A NCAC 02T .0100:
1. Application type: ❑ New ® Major Modification ❑ Minor Modification
If a modification, provide the existing permit number: WQ0031246 and most recent issuance date: August 25, 2021
2. Application fee: $395 - Standard - Major Facility - Major Mod
3. Does this project utilize public monies or lands? ❑ Yes or ® No
If yes, was an Environmental Assessment required under 15A NCAC 01 C? ❑ Yes or ❑ No
If yes, which final environmental document is submitted? ❑ Finding of No Significant Impact or ❑ Record of Decision
Briefly describe any mitigating factors from the Environmental Assessment that may impact this facility:
4. What is the status of the following permits/certifications applicable to the subject facility?
Permit/Certification
Date
Submitted
Date
Approved
Permit/Certification
Number
Agency Reviewer
Collection System (O > 200,000 GPD)
Dam Safety
Erosion & Sedimentation Control Plan
Nationwide 12 / Section 404
Pretreatment
Sewer System
Stormwater Management Plan
Wetlands 401
Other:
5. What is the wastewater type? ® Domestic or Industrial (See 15A NCAC 021.0103(20))
Is there a Pretreatment Program in effect? ❑ Yes or ❑ No
Has a wastewater chemical analysis been submitted? ❑ Yes or ❑ No
6. Wastewater flow: 3,350 GPD
Limited by: ® Treatment, ❑ Storage, ❑ Field/Basin Hydraulics, ❑ Field Agronomics or ❑ Groundwater Mounding
7. Explain how the wastewater flow was determined: ® 15A NCAC 02T .0114 or ❑ Representative Data
Has a flow reduction been approved under 15A NCAC 02T .0114(f)? ❑ Yes or ❑ No
Establishment Type
Daily Design Flow'
No. of Units
Flow
3-bedroom Single Family Dwellings
120 gal/bedroom
9
3,240 GPD
gal/
GPD
gal/
GPD
gal/
GPD
gal/
GPD
gal/
GPD
Total
3,240 GPD
a See 15A NCAC 02T .0114(b), (d), (e)(1) and (e)(2) for caveats to wastewater design flow rates (i.e., minimum flow per
dwelling; proposed unknown non-residential development uses; public access facilities located near high public use areas;
and residential property located south or east of the Atlantic Intracoastal Waterway to be used as vacation rentals as defined
in G.S. 42A-4).
FORM: HRIS 06-16 Page 2 of 13

IV. GENERAL REQUIREMENTS —15A NCAC 02T .0100 (continued):
8. What is the nearest 100-year flood elevation to the facility? Zone X feet mean sea level. Source: NCFloodmaps.com
Are any treatment, storage or infiltration facilities located within the 100-year flood plain? ❑ Yes or ® No
If yes, which facilities are affected and what measures are being taken to protect them against flooding?
If yes, has the Applicant submitted written documentation of compliance with & 143 Article 21 Part 6? ❑ Yes or ❑ No
9. Has the Applicant provided documentation of the presence or absence of threatened or endangered aquatic species utilizing
information provided by the Department's Natural Heritage Program? ® Yes or ❑ No
10. Does the facility have a proposed or existing groundwater monitoring well network? ® Yes or ❑ No
If no, provide an explanation as to why a groundwater monitoring well network is not proposed:
If yes, complete the following table (NOTE — This table may be expanded for additional wells):
Well Name
Status
Latitude a
Longitude a
Gradient
Location
MW-1
Active
36.0733"
-76.4932"
Down Gradient
On Review Boundary
MW-2
Active
36.07330
-76.49320
Down Gradient
On Review Boundary
MW-3
Active
36.07270
-76.49150
Down Gradient
On Review Boundary
MW-4
Active
36.07270
-76.49150
Down Gradient
On Review Boundary
MW-5
Active
36.07150
-76.49230
Down Gradient
On Review Boundary
MW-6
Active
36.07140
-76.49230
Down Gradient
On Review Boundary
MW-7
Active
36.07210
-76.49400
Down Gradient
On Review Boundary
MW-8
Active
36.07210
-76.49390
Down Gradient
On Review Boundary
Select
0-
0Select
Select
Select
-
Select
Select
a Provide the following latitude and longitude coordinate determination information:
Datum: NAD83 Level of accuracy: Nearest I0th of a second Method of measurement:
Navigation quality GPS
11. If the Applicant is a Privately -Owned Public Utility, has a Certificate of Public Convenience and Necessity been submitted?
❑ Yes, ❑No or ®N/A
12. If the Applicant is a Developer of lots to be sold, has a Developer's Operational Agreement (FORM: DEV) been submitted?
❑ Yes, ❑No or ®N/A
13. If the Applicant is a Home/Property Owners' Association, has an Association Operational Ageement (FORM: HOA) been
submitted? ® Yes, [:]No or []N/A
14. Demonstration of historical consideration for permit approval — 15A NCAC 02T .0120:
Has the Applicant or any parent, subsidiary or other affiliate exhibited the following?
a. Has been convicted of environmental crimes under Federal law or G.S. 143-215.613? ❑ Yes or ® No
b. Has previously abandoned a wastewater treatment facility without properly closing that facility? ❑ Yes or ® No
c. Has unpaid civil penalty where all appeals have been abandoned or exhausted? ❑ Yes or ® No
d. Is non -compliant with an existing non -discharge permit, settlement agreement or order? ❑ Yes or ❑ No
e. Has unpaid annual fees in accordance with 15A NCAC 02T .0105(e)(2)? ❑ Yes or ® No
FORM: HR1S 06-16 Page 3 of 13

V. WASTEWATER TREATMENT FACILITY DESIGN CRITERIA —15A NCAC 02T .0705:
1. For the following parameters, provide the estimated influent concentrations and designed effluent concentrations as
determined in the Engineering Calculations, and utilized in the Agronomic Evaluation and Groundwater Modeling (if
applicable):
Parameter
Estimated Influent Concentration
Designed Effluent Concentration
(monthly average)
Ammonia Nitrogen (NH3-N)
52.5 mg/L
4 mg/L
Biochemical Oxygen Demand (BODS)
200 mg/L
10 mg/L
Fecal Coliforms
14 per 100 mL
Nitrate Nitrogen (NO3-N)
mg/L
10 mg/L
Nitrite Nitrogen (NO2-N)
mg/L
mg/L
Total Kjeldahl Nitrogen
mg/L
Total Nitrogen
70 mg/L
14 mg/L
Total Phosphorus
mg/L
mg/L
Total Suspended Solids (TSS)
80 mg/L
15 mg/L
2. Is flow equalization of at least 25% of the average daily flow provided? ® Yes or ❑ No
3. Does the treatment facility include any bypass or overflow lines? ❑ Yes or ® No
If yes, describe what treatment units are bypassed, why this is necessary, and where the bypass discharges:
4. Are multiple pumps provided wherever pumps are used? ® Yes or ❑ No
If no, how does the Applicant intend on complying with 15A NCAC 02T .0705(i)?
5. Check the appropriate box describing how power reliability will be provided in accordance with 15A NCAC 02T .0705(k):
® Automatically activated standby power supply onsite capable of powering all essential treatment units; or
❑ 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;
)o Has sufficient storage capacity that no potential for overflow exists; and
➢ Can tolerate septic wastewater due to prolonged detention.
6. If the wastewater treatment system is located within the 100-year flood plain, are there water -tight seals on all treatment units
or a minimum of two feet protection from the 100-year flood plain elevation? ❑ Yes, ❑ No or ® N/A
7. In accordance with 15A NCAC 02T .0705(n), how many days of residuals storage are provided? +30
8. How does the Applicant propose to prohibit public access to the wastewater treatment and storage facilities? Existing fencing
9. If an influent pump station is part of the proposed facility (i.e., within the wastewater treatment plant boundary), does the
influent pump station meet the design criteria in 15A NCAC 02T .0305(h)? ❑ Yes, ❑ No, ® N/A — To be permitted
separately, or ❑ N/A — Gravity fed
10. If septic tanks are part of the wastewater treatment facility, do the septic tanks adhere to the standards in 15A NCAC 18A
.1900? ❑ Yes, ❑ No or ® N/A
FORM: HRIS 06-16 Page 4 of 13

V. WASTEWATER TREATMENT FACILITY DESIGN CRITERIA — 15A NCAC 02T .0705 (continued):
11. Provide the requested treatment unit and mechanical equipment information:
a. PRELIMINARY / PRIMARY TREATMENT (i.e., physical removal operations and flow equalization):
Treatment Unit
No. of
Units
Manufacturer or
Material
Dimensions (ft) /
S acin s in)
Volume
(gallons)
Plan Sheet
Reference
Specification
Reference
Coarse Screen
1
BCSI 200-E
9'x7'x2'
n/a
Flow Equalization
1
welded steel
I Fx36'xI F
30,000
Select
Select
Select
b. SECONDARY / TERTIARY TREATMENT (i.e., biological and chemical processes to remove organics and nutrients)
Treatment Unit
No. of
Manufacturer or
Dimensions (ft)
Volume
Plan Sheet
Specification
Units
Material
( allons)
Reference
Reference
12,000 total
-6,000 gallon in
Orenco AXMAX,
first stage
non -submerged
textile
Other
1
textile media filter
42x8x7
-3,000 gallon in
with denitrification
denite chamber
MBBR
-3,000 gallon in
polish/discharge
Select
Select
Select
Select
Select
Select
Select
c. DISINFECTION
Treatment Unit
No. of
Manufacturer or
Dimensions (ft)
Volume
Plan Sheet
Specification
Units
Material
(gallons)
Reference
Reference
Sanitron 52400 in
8 gallons,
Ultraviolet
2
series
4
40 gpm
Select
➢ If chlorination is the proposed method of disinfection, specify detention time provided: minutes (NOTE — 30
minutes minimum required), and indicate what treatment unit chlorine contact occurs:
➢ If ultraviolet (UV) light is the proposed method of disinfection, specify the number of banks: , number of lamps
per bank: and maximum disinfection capacity: GPM.
d. RESIDUAL TREATMENT
No. of
Manufacturer or
Volume
Plan Sheet
Specification
Treatment Unit
Units
Material
Dimensions (ft)
(gallons)
Reference
Reference
Select
Select
FORM: 14RIS 06-16 Page 5 of 13

V. WASTEWATER TREATMENT FACILITY DESIGN CRITERIA —15A NCAC 02T .0705 (continued):
e. PUMPS
Location
No. of
Pumps
Purpose
Manufacturer /
Type
Capacity
Plan Sheet
Reference
Specification
Reference
GPM
TDH
AXMAX - 1 st stage
3
(2) First Stage
Recirculation Pump
(2) Pre -Anoxic
Return Pump
Orenco Turbine
Pump
75
45
AXMAX - MBBR
compartment
2
(2) Up flow Pump
Orenco Turbine
Pum
20
100
AXMAX -Polish
stage and discharge
4
(2) Polish Stage
Recirculation Pump
(2) Discharge Pump
Orenco Turbine
Pump
20
100
f BLOWERS
Location
No. of
Blowers
Units Served
Manufacturer /
Type
Capacity
(CFM)
Plan Sheet
Reference
Specification
Reference
Packed Bed Media
Filter
1
1
Cincinnaii LMF-6
245
CFM at 0"
H2O
g. MIXERS
Location
No. of
Mixers
Units Served
Manufacturer /
Type
Power
(h)
Plan Sheet
Reference
Specification
Reference
h. RECORDING DEVICES & RELIABILITY
Device
No. of
Units
Location
Manufacturer
Maximum
Capacity
Plan Sheet
Reference
Specification
Reference
Other
Select
Select
Select
i. EFFLUENT PUMP / DOSING TANK (IF APPLICABLE):
FORM: HRIS 06-16 Page 6 of 13

Plan Sheet
Reference
Specification
Reference
Internal dimensions (L x W x H or (p x H)
ft ft
ft
Total volume
ft3
gallons
Dosing volume
ft3
gallons
Audible & visual alarms
Equipment to prevent infiltration during rain
events (if applicable)
FORM: HRIS 06-16 Page 7 of 13

VI. EARTHEN STORAGE IMPOUNDMENT DESIGN CRITERIA —15A NCAC 02T .0705:
IF MORE THAN ONE IMPOUNDMENT PROVIDE ADDITIONAL COPIES OF THIS PAGE AS NECESSARY.
1. What is the earthen impoundment type? Select
2. Storage Impoundment Coordinates (Decimal Degrees): Latitude: Longitude: - °
Datum: Select Level of accuracy: Select Method of measurement: Select
3. Do any impoundments include a discharge point (pipe, spillway, etc)? ❑ Yes or ❑ No
4. Are subsurface drains present beneath or around the impoundment to control groundwater elevation? ❑ Yes or ❑ No
5. Is the impoundment designed to receive surface runoff? ❑ Yes or ❑ No
If yes, what is the drainage area? ft2, and was this runoff incorporated into the water balance? ❑ Yes or ❑ No
6. If a liner is present, how will it be protected from wind driven wave action?:
7. Will the earthen impoundment water be placed directly into or in contact with GA classified groundwater? ❑ Yes or ❑ No
If yes, has the Applicant provided predictive calculations or modeling demonstrating that such placement will not result in a
contravention of GA groundwater standards? ❑ Yes or ❑ No
8. What is the depth to bedrock from the earthen impoundment bottom elevation? ft
If the depth to bedrock is less than four feet, has the Applicant provided a liner with a hydraulic conductivity no greater than
1 x 10'7 cm/s? ❑ Yes, F-1 No or ❑ N/A
Has the Applicant provided predictive calculations or modeling demonstrating that surface
water or groundwater standards will not be contravened? ❑ Yes or ❑ No
If the earthen impoundment is excavated into bedrock, has the Applicant provided predictive calculations or modeling
demonstrating that surface water or groundwater standards will not be contravened? ❑ Yes, ❑ No or ❑ N/A
9. If the earthen impoundment is lined and the mean seasonal high water table is higher than the impoundment bottom
elevation, how will the liner be protected (e.g., bubbling, groundwater infiltration, etc.)?
10. If applicable, provide the specification page references for the liner installation and testing requirements:
11. If the earthen impoundment is located within the 100-year flood plain, has a minimum of two feet of protection (i.e., top of
embankment elevation to 100-year flood plain elevation) been provided? ❑ Yes or ❑ No
12. Provide the requested earthen impoundment design elements and dimensions:
Earthen Impoundment Design Elements
Earthen Impoundment Dimensions
Liner type:
❑ Clay
❑ Synthetic
Top of embankment elevation:
ft
❑ Other
Unlined
Liner hydraulic conductivity:
x cm/s
Freeboard elevation:
ft
Hazard class:
Select
Toe of slope elevation:
ft
Designed freeboard:
ft
Impoundment bottom elevation:
ft
Total volume:
ft3
gallons
Mean seasonal high water table depth:
ft
Effective volume:
ft3
gallons
Embankment slope:
Effective storage time:
days
Top of dam water surface area:
ft2
Plan Sheet Reference:
Freeboard elevation water surface area:
ft2
Specification Section:
Bottom of impoundment surface area:
ft2
NOTE — The effective volume shall be the volume between the two foot freeboard elevation and the: (1) pump intake pipe
elevation; (2) impoundment bottom elevation or (3) mean seasonal high water table, whichever is closest to the two foot
freeboard elevation.
FORM: HRIS 06-16 Page 8 of 13

VII. INFILTRATION SYSTEM DESIGN CRITERIA —15A NCAC 02T .0705:
1. Provide the minimum depth to the seasonal high water table within the infiltration area: 14 inches
NOTE — The vertical separation between the seasonal high water table and the ground surface shall be at least one foot.
2. Are there any artificial drainage or water movement structures (e.g., surface water or groundwater) within 200 feet of the
infiltration area? ® Yes or ❑ No
If yes, were these structures addressed in the Soil Evaluation and/or Hydrogeologic Report, and are these structures to be
maintained or modified? Yes
3. Soil Evaluation recommended loading rates (NOTE — This table may be expanded for additional soil series):
Basins/Fields
Recommended
Recommended
Recommended
Annual /
If Seasonal, list
Soil Series
within Soil
Loading Rate
Loading Rate
Loading Rate
Seasonal
appropriate
Series
(in/hr)
(in/ r)
(GPD/ft2)
Loading
months
Dogue
Infiltration
0.033
755
1.29
Annual
Basin
Wahee
Infiltration
0.033
755
1.29
Annual
Basin
Roanoke
Infiltration
0.033
755
1.29
Annual
Basin
Select
Select
Select
4. Are the designed loading rates less than or equal to Soil Evaluation recommended loading rates? ® Yes or ❑ No
If no, how does the Applicant intend on complying with 15A NCAC 02T .0705(m)?
5. How does the Applicant propose to prohibit public access to the infiltration facilities? WWTP is surrounded by fencing and
the HRI basin has existing signage.
6. Has the infiltration system been equipped with a flow meter to accurately determine the volume of effluent applied to each
basin/field as listed in VII.8.? ❑ Yes or ® No
If no, how does the Applicant intend on determining the amount of effluent applied to each basin/field? Cvlce counter and
elapsed time meter in Orenco Control Panel
7. For non -basins, provide the required cover crop information and demonstrate the effluent will be applied at or below
agronomic rates:
Cover Crop
Soil Series
% Slope
Nitrogen Uptake Rate
(lbs/ac r)
Phosphorus Uptake
Rate (lbs/ac• r)
FORM: HRIS 06-16 Page 9 of 13

a. Specify where the nitrogen and phosphorus uptake rates for each cover crop were obtained:
b. Proposed nitrogen mineralization rate:
c. Proposed nitrogen volatilization rate:
d. Minimum infiltration area from the Agronomist Evaluation's nitrogen balance: ft-
e. Minimum infiltration area from the Agronomist Evaluation's phosphorus balance: ft2
f. Minimum infiltration area from the water balance: ft2
FORM: HRIS 06-16 Page 10 of 13

VII. INFILTRATION SYSTEM DESIGN CRITERIA —15A NCAC 02T .0705 (continued):
8. Basin/Field Information (NOTE — This table may be expanded for additional fields):
Basin/
Field
Area
(acres)
Dominant
Soil Series
Designed
Loading
Rate
(in/hr)
Designed
Loading
Rate
in/ r)
Designed
Loading
Rate
(GPD/ft')
a
Latitude
Longitude e
Waterbody
Stream
Index No. n
Classification
0
0
0
C
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
O
0
0
O
0
Total
a Provide the following latitude and longitude coordinate determination information:
Datum: Select Level of accuracy: Select Method of measurement: Select
b For assistance determining the waterbody stream index number and its associated classification, instructions may be
downloaded at: httD://dea.nc.eov/about/divisions/water-resources/planninP/classification-standards/classifications
9. High -Rate Infiltration System design criteria:
a. Infiltration Fields:
Spray Infiltration Design Elements
Drip Infiltration Design Elements
Nozzle wetted diameter:
ft
Emitter wetted area:
ftz
Nozzle wetted area:
ft,
Distance between laterals:
ft
Nozzle capacity:
GPM
Distance between emitters:
ft
Nozzle manufacturer/model:
/
Emitter capacity:
GPH
Elevation of highest nozzle:
ft
Emitter manufacturer/model:
/
Specification Section:
Elevation of highest emitter:
ft
Specification Section:
FORM: HRIS 06-16 Page 11 of 13

VII. INFILTRATION SYSTEM DESIGN CRITERIA —15A NCAC 02T .0705 (continued):
b. Infiltration Basins:
IF MORE THAN TWO BASINS PROVIDE ADDITIONAL COPIES OF THIS PAGE AS NECESSARY.
Infiltration Basin Design Elements
Infiltration Basin Dimensions
Basin Name:
Riversound HRIB
Top of embankment elevation:
13 ft
Hazard class:
Not Applicable
Freeboard elevation:
I 1 ft
Designed freeboard:
2 ft
Toe of slope elevation:
-20 ft
Total volume:
3,340,713 ft3
Impoundment bottom elevation:
-20 ft
Infiltrative surface area:
186,511 ft2
Mean seasonal high water table depth:
7 ft
Daily infiltrative capacity:
64,000 GPD
Embankment slope:
3 : 1
Plan Sheet Reference:
Top of dam water surface area:
189,291 ft2
Specification Section:
Freeboard elevation water surface area:
178,092 ft2
Bottom of impoundment surface area:
22,460 ft2
i. Does this basin include a discharge point (pipe, spillway, etc)? ❑ Yes or ® No
ii. Are subsurface drains present around the impoundment to control groundwater elevation? ❑ Yes or ® No
iii. Is the basin designed to receive surface runoff? ❑ Yes or ® No
If yes, what is the drainage area? ft2, and was this runoff incorporated into the loading rate? ❑ Yes or ❑ No
iv. Will the effluent be placed directly into or in contact with GA classified groundwater? ❑ Yes or ® No
If yes, has the Applicant provided predictive calculations or modeling demonstrating that such placement will not
result in a contravention of GA groundwater standards? ❑ Yes or ❑ No
v. If the infiltration basin is located within the 100-year flood plain, has a minimum of two feet of protection (i.e., top of
embankment elevation to 100-year flood plain elevation) been provided? ® Yes or ❑ No
Infiltration Basin Design Elements
Infiltration Basin Dimensions
Basin Name:
Top of embankment elevation:
ft
Hazard class:
Select
Freeboard elevation:
ft
Designed freeboard:
ft
Toe of slope elevation:
ft
Total volume:
ft3
impoundment bottom elevation:
ft
Infiltrative surface area:
ft2
Mean seasonal high water table depth:
ft
Daily infiltrative capacity:
GPD
Embankment slope:
Plan Sheet Reference:
Top of dam water surface area:
ft2
Specification Section:
Freeboard elevation water surface area:
ft2
Bottom of impoundment surface area:
ft2
i. Does this basin include a discharge point (pipe, spillway, etc)? ❑ Yes or ❑ No
ii. Are subsurface drains present around the impoundment to control groundwater elevation? ❑ Yes or ❑ No
iii. Is the basin designed to receive surface runoff? ❑ Yes or ❑ No
If yes, what is the drainage area? ft2, and was this runoff incorporated into the loading rate? ❑ Yes or ❑ No
iv. Will the effluent be placed directly into or in contact with GA classified groundwater? ❑ Yes or ❑ No
If yes, has the Applicant provided predictive calculations or modeling demonstrating that such placement will not
result in a contravention of GA groundwater standards? ❑ Yes or ❑ No
v. If the infiltration basin is located within the 100-year flood plain, has a minimum of two feet of protection (i.e., top of
embankment elevation to 100-year flood plain elevation) been provided? ❑ Yes or ❑ No
FORM: HRIS 06-16 Page 12 of 13

VIII. SETBACKS —15A NCAC 02T .0706:
1. Does the project comply with all setbacks found in the river basin rules 05A NCAC 02B .0200)? ® Yes or ❑ No
If no, list non -compliant setbacks:
2. Have any setback waivers been obtained in order to comply with 15A NCAC 02T .706(a) and .0706(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
3. Provide the minimum field observed distances (ft) for each setback parameter to the infiltration system and treatment/storage
units (NOTE — Distances greater than 500 feet may be marked N/A):
Setback Parameter
Infiltration
System
Treatment /
Storage Units
Any habitable residence or place of assembly under separate ownership or not to be
maintained as part of the project site
>400 ft
> 100 ft
Any habitable residence or place of assembly owned by the Permittee to be maintained as
art of the project site
>400 ft
Any private or public water supply source
>400 ft
> 100 ft
Surface waters (streams — intermittent and perennial, perennial waterbodies, and wetlands)
>50 ft
Groundwater lowering ditches (where the bottom of the ditch intersects the SHWT)
N/A
Subsurface groundwater lowering drainage systems
>200 ft.
Surface water diversions (ephemeral streams, waterways, ditches)
>50 ft.
Any well with exception of monitoring wells
> 100 f
> 100 ft
Any property line
>200 ft
>50 ft
Top of slope of embankments or cuts of two feet or more in vertical height
> 100 ft
Any water line from a disposal system
>400 ft
Any swimming pool
>400 ft
Public right of way
>200 ft
Nitrification field
>400 ft
Any building foundation or basement
>400 ft
Impounded public water supplies
>500 ft.
Public shallow groundwater supply (less than 50 feet deep)
>500 ft
4. Does the Applicant intend on complying with either 15A NCAC 02T .0706(b) or (c)? ❑ Yes or ® No
If yes, what are the designed Total Nitrogen and Total Phosphorus effluent concentrations? TN: — mg/L TP: _ mg/L
5. Does the Applicant intend on complying with the High -Rate Policy issued October 27, 2006? ❑ Yes or ® No
If yes, verify the following information:
✓ Are the most stringent effluent standards in both 15A NCAC 02T .0705(b) and 15A NCAC 02U .0301(b) met?
❑Yes or❑No
✓ Is duality provided for all treatment units per 15A NCAC 02U .0402(c)? ❑ Yes or ❑ No
✓ Continuous online monitoring and recording of effluent for turbidity? ❑ Yes or ❑ No
✓ A lined 5-day upset pond is provided? ❑ Yes or ❑ No
✓ The 5-day upset pond has restricted access? ❑ Yes or ❑ No
✓ A certified operator of a grade equal or greater than the facility classification is on call 24 hrs/day? ❑ Yes or ❑ No
FORM: HR1S 06-16 Page 13 of 13

IX. COASTAL WASTE TREATMENT DISPOSAL REQUIREMENTS —15A NCAC 02H .0400:
1. Is this facility located in a Coastal Area as defined per 15A NCAC 02H .0403? []Yes or ❑ No
For assistance determining if the facility is located within the Coastal Area, a reference map may be downloaded at: Coastal
Areas Boundary.
2. Is this an Interim Treatment and Disposal Facility per 15A NCAC 02H .0404(a)? ❑ Yes or ® No
NOTE — Interim facilities do not include County and Municipal area -wide collection and treatment systems.
IF ANSWERED YES TO ITEMS IX.1. AND IX.2., THEN COMPLETE ITEMS IXA THROUGH IX.16.
3. Is equalization of at least 25% of the average daily flow provided? ® Yes or ❑ No
4. How will noise and odor be controlled? Pumps and Blowers are housed
5. Is an automatically activated standby power source provided? ® Yes or ❑ No
6. Are all essential treatment units provided in duplicate? ® Yes or ❑ No
NOTE — Per 15A NCAC 02T .0103(16), essential treatment units are defined as any unit associated with the wastewater
treatment process whose loss would likely render the facility incapable of meeting the required performance criteria, including
aeration units or other main treatment units, clarification equipment, filters, disinfection equipment, pumps and blowers.
7. Are the disposal units (i.e., infiltration basins/fields) provided in duplicate? ❑ Yes or ® No
8. Is there an impounded public surface water supply within 500 feet of the infiltration area? ❑ Yes or ® No
9. Is there a public shallow groundwater supply (less than 50 feet deep) within 500 feet of the infiltration area? ❑ Yes or ® No
10. Is there a private groundwater supply within 100 feet of the infiltration area? ❑ Yes or ® No
11. Are there any SA classified waters within 100 feet of the infiltration area? ❑ Yes or ® No
12. Are there any non -SA classified waters within 50 feet of the infiltration area? ❑ Yes or ® No
13. Are there any surface water diversions (i.e., drainage ditches) within 25 feet of the infiltration area? ❑ Yes or ® No
14. Per the requirements in 15A NCAC 02H .0404(Q)(7), how much green area is provided? 913,192 ft'
15. Is the green area clearly delineated on the plans? ® Yes or ❑ No
16. Is the spray infiltration wetted area within 200 feet of any adjoining properties? ❑ Yes, ❑ No or ® N/A
X. GROUNDWATER LOWERING SYSTEM DESIGN:
1. Does this project utilize a groundwater lowering system? ❑ Yes or ® No (If yes, complete Items X.2. through X.4.)
2. Is the groundwater lowering system: ❑ mechanically lowered (i.e., pumped) or ❑ gravity fed?
3. Where does the groundwater lowering drainage system discharge?
If the system mechanically lowers groundwater and discharges directly or indirectly (i.e., pond overflow) to surface waters,
wetlands and/or stormwater structures, provide the date the Applicant obtained written confirmation from the Water Quality
Regional Operations Section that operation of the groundwater lowering drainage system will not adversely affect surface
waters of the State. Submitted: & Received:
4. Groundwater lowering system design criteria:
Groundwater Lowering System Design
Pipe diameter:
in
Discharge rate:
GPD
Pipe material:
Method to measure discharge rate:
Pipe depth:
ft
Number of pumps:
Pipe length:
ft
Pump capacity:
GPM
TDH
Pipe slope (gravity -fed):
%
Plan Sheet Reference:
Trench backfill material:
Specification Section:
FORM: HRIS 06-16 Page 14 of 13

Professional Engineer's Certification:
I, Alo 4u F rn-N6 t n.1►�.-G12.1 m <A . ;?u-G - J Q 5F P t-}- Si A �J LA v r t t'V— . attest that this application for
(Professional Engineer's name from Application Item Ill. I.)
R..� V c,-J u.; P
(Facility name from Application Item II.1.)
has been reviewed by me and is accurate, complete and consistent with the information supplied in the plans, specifications, engineering
calculations, and all other supporting documentation to the best of my knowledge. I further attest that to the best of my knowledge the
proposed design has been prepared in accordance with this application package and its instructions, as well as all applicable regulations
and statutes. Although other professionals may have developed certain portions of this submittal package, inclusion of these materials
under my signature and seal signifies that I have reviewed this material and have judged it to be consistent with the proposed design.
NOTE - In accordance with General Statutes 143-215.6A and 143-215.6B, 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, signature, and date:
o�jk GAR
,•�Q�'o�Essioj 9
2•
SEAL
026OW
f� .. �. Rom._ �cQ►.%L
Applicant's Certification per 15A NCAC 02T .0106(b):
. q zz Z-,7
attest that this application for
(Signature Authority's name & title from Application Item I.3.)
Y� v Sf�s x.c (Ji l l}-T
(Facility name from Application Item II.1.)
has been reviewed by me and is accurate and complete to the best of my knowledge. 1 understand that any discharge of wastewater
from this non -discharge system to surface waters or the land will result in an immediate enforcement action that may include civil
penalties, injunctive relief, and/or criminal prosecution. 1 will make no claim against the Division of Water Resources should a condition
of this permit be violated. 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. 1 further certify
that the Applicant or any affiliate has not been convicted of an environmental crime, has not abandoned a wastewater facility without
proper closure, does not have an outstanding civil penalty where all appeals have been exhausted or abandoned, are compliant with any
active compliance schedule, and do not have any overdue annual fees per.] 5A NCAC 02T_.0105 e .
NOTE - In accordance with General Statutes 143-215,6t11 and 113_21 .613, any person who knowingly makes any false statement,
representation, or certificate in any app icati n package shall be guilty of a Class 2 misdemeanor, which may include a fine not to
exceed $10,000 as c' ?111 Xpt 5,000 per violation.
Signature: Date: �R 2 7-? ZZ
FORM: HRIS 06-16 Page 15 of 13

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�5

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
RICHARD E. ROGERS, JR.
Director
ED KILEY — VICE PRESIDENT
NORTH CAROLINA
Environmental Quality
August 5, 2022
RIVERSOUND PROPERTY OWNERS ASSOCIATION, INC.
POST OFFICE BOX 572
EDENTON, NORTH CAROLINA 27932
Subject: Application No. WQ0031246
Permit Application Return
Riversound WWTP
High -Rate Infiltration System
Chowan County
Dear Mr. Kiley:
This letter is in reference to your permit major modification request received July 15, 2022.
During the pre -review process, it was noted that the following items were missing from the
submitted application package:
1. Pursuant to 15A NCAC 02T .0704(c)(2) and Application Instruction J, submit specifications that have
been signed, sealed and dated by a North Carolina licensed Professional Engineer, and shall include at
a minimum:
➢ Table of contents with each section/page numbered.
➢ Detailed specifications for each modified treatment unit, as well as all piping, valves, equipment
(i.e., pumps, blowers, mixers, diffusers, flow meters, etc.), nozzles/emitters, precipitation/soil
moisture sensor (if applicable), audible/visual high water alarms, liner material, etc.
➢ Site Work (i.e., earthwork, clearing, grubbing, excavation, trenching, backfilling, compacting,
fencing, seeding, etc.)
➢ Materials (i.e., concrete, masonry, steel, painting, method of construction, etc.)
➢ Electrical (i.e., control panels, transfer switches, automatically activated standby power source,
etc.)
➢ Means for ensuring quality and integrity of the finished product, including leakage, pressure, and
liner testing.
➢ Specifications shall represent a completed design and not be labeled with preliminary phrases (e.g.,
FOR REVIEW ONLY, NOT FOR CONSTRUCTION, etc.) that indicate they are anything other
than final specifications. However, the specifications may be labeled with the phrase: FINAL
DESIGN - NOT RELEASED FOR CONSTRUCTION.
DNorth Carolina Department of Environmental Quality I Division of Water Resources
EQ> 512 North Salisbury Street 11617 Mail Service Center I Raleigh, North Carolina 27699-1617
NORTH GAROLINA +
919.707.9000

Mr. Ed Kiley
August 5, 2022
Page 2 of 3
2. Pursuant to 15A NCAC 02T .0704(c)(3) and Application Instruction K, submit engineering calculations
that have been signed, sealed and dated by a North Carolina licensed Professional Engineer, and shall
include at a minimum:
➢ Hydraulic and pollutant loading calculations for each modified treatment unit demonstrating how
the designed effluent concentrations in Application Item V.1. were determined.
➢ Sizing criteria for each modified treatment unit and associated equipment (i.e., blowers, mixers,
flow meters, pumps, etc.).
➢ Friction/total dynamic head calculations and system curve analysis for each modified pump used.
➢ Manufacturer's information for all modified treatment units, pumps, blowers, mixers, diffusers,
flow meters, etc.
➢ Flotation calculations for all modified treatment units constructed partially or entirely below grade.
➢ A demonstration that the specified auxiliary power source is capable of powering all essential
treatment units.
3. Pursuant to 15A NCAC 02T .0707 and Application Instruction N, submit an operation and maintenance
(O&M) plan for the modified wastewater treatment system that shall include at a minimum a
description of -
Operation of the modified wastewater treatment system in sufficient detail to show what operations
are necessary for the system to function and by whom the functions are to be conducted.
➢ Anticipated maintenance of the modified wastewater treatment system.
➢ Safety measures, including restriction of access to the site and equipment.
➢ Spill prevention provisions such as response to upsets and bypasses, including how to control,
contain and remediate.
➢ Contact information for plant personnel, emergency responders and regulatory agencies.
4. Pursuant to 15A NCAC 02T .0704(j), 02T .0708, and Application Instruction O, submit a Residuals
Management Plan that shall include at a minimum:
➢ A detailed explanation of how generated residuals (including trash, sediment, and grit) will be
collected, handled, processed, stored, treated, and disposed.
➢ An evaluation of the modified 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 removal and collection are a designed unit process, submit an oil/grease disposal plan
detailing how the oil/grease will be collected, handled, processed, stored, and disposed.
5. Please note the Division will retain the $395 major modification fee in anticipation of the resubmittal.
6. When resubmitting, please submit the original application and the above omitted materials as a
single PDF at: httys://edocs.deci.nc.eov/Forms/NonDischaree-Branch-Submittal-Form-Ver2.

Mr. Ed Kiley
August 5, 2022
Page 3 of 3
Accordingly, your permit major modification request is being returned as incomplete pursuant to
15A NCAC 02T .0107(b).
The success of the Water Quality Permitting Section's Non -Discharge Branch process depends
upon the receipt of complete and accurate applications and supporting documentation. Please amend the
application package to include the previously noted omitted items and resubmit with the appropriate permit
processing fee.
Please be advised that construction and/or operation of the subject facilities without a valid
permit is a violation of G.S. 143-215.1, and may subject you to appropriate enforcement actions
pursuant to G.S. 143-215.6A., 613., and 6C. Civil penalties of up to $25,000 per day per violation may
be assessed for failure to secure a valid permit.
If you need additional information concerning this letter, please contact me at [phone] or
nathaniel.thomburgkncdenr.gov.
Sincerely,
Nathaniel D. Thornburg, Branch Chi f
Division of Water Resources
cc: Washington Regional Office, Water Quality Regional Operations Section (Electronic Copy)
Joseph J. Anlauf, PE — Anlauf Engineering, PLLC (Electronic Copy)
Laserfiche File (Electronic Copy)

Joseph J. Anlauf, P.E.
Firm License P-0929
November 21, 2022
Mr. Nathaniel Thornburg, Branch Chief
NCDEQ, Division of Water Resources
Mail Service Center
Raleigh, NC 27699-1634
Re: Application No. WQ0031246
Permit Application Return
Riversound WWTP
High -Rate Infiltration System
Chowan County
Dear Nathaniel;
The following items are being submitted in response to the Request for Additional Information
letter dated August 5, 2022:
1. Pursuant to 15A NCAC 02T . 0704(c)(2) and Application Instruction J, submit
specifications that have been signed, sealed and dated by a North Carolina licensed Professional
Engineer, and shall include at a minimum:
Table of contents with each section/page numbered.
Detailed specifications for each modified treatment unit, as well as all piping, valves,
equipment (i.e., pumps, blowers, mixers, diffusers, flow meters, etc.), nozzles/emitters,
precipitation/soil moisture sensor (if applicable), audible/visual high water alarms, liner
material, etc.
Site Work (i.e., earthwork, clearing, grubbing, excavation, trenching, backfilling,
compacting, fencing, seeding, etc.)
Materials (i.e., concrete, masonry, steel, painting, method of construction, etc.)
Electrical (i. e., control panels, transfer switches, automatically activated standby power
source, etc.)
Means for ensuring quality and integrity of the finished product, including leakage,
pressure, and liner testing.
Specifications shall represent a completed design and not be labeled with preliminary
phrases (e.g., FOR REVIEW ONLY, NOT FOR CONSTRUCTION, etc) that indicate they are
anything other than final specifications. However, the specifications may be labeled with the
phrase: FINAL DESIGN - NOT RELEASED FOR CONSTRUCTION.
Please find attached sealed engineering specifications stamped "Preliminary".
2. Pursuant to 15A NCAC 02T . 0704(c)(3) and Application Instruction K, submit
engineering calculations that have been signed, sealed and dated by a North Carolina licensed
Professional Engineer, and shall include at a minimum:
Hydraulic and pollutant loading calculations for each modified treatment unit
demonstrating how the designed effluent concentrations in Application Item V.1. were
determined.
4721 W. Eckner St., Kitty Hawk, North Carolina [phone]

Joseph J. Anlauf, P.E.
Firm License P-0929
Sizing criteria for each modified treatment unit and associated equipment (i.e., blowers,
mixers, flow meters, pumps, etc).
Friction/total dynamic head calculations and system curve analysis for each modified
pump used.
Manufacturer's information for all modified treatment units, pumps, blowers, mixers,
diffusers, flow meters, etc.
Flotation calculations for all modified treatment units constructed partially or entirely
below grade.
A demonstration that the specified auxiliary power source is capable of powering all
essential treatment units.
Please find attached signed and sealed Process Calculations for the proposed packaged
wastewater system.
3. Pursuant to 15A NCAC 02T.0707 and Application Instruction N, submit an operation
and maintenance (O&M) plan for the modified wastewater treatment system that shall include at
a minimum a description of. -
Operation of the modified wastewater treatment system in sufficient detail to show what
operations are necessary for the system to function and by whom the functions are to be
conducted.
Anticipated maintenance of the modified wastewater treatment system.
Safety measures, including restriction of access to the site and equipment.
Spill prevention provisions such as response to upsets and bypasses, including how to
control, contain and remediate.
Contact information for plant personnel, emergency responders and regulatory agencies.
Please find attached an Operation and Maintenance Manual for the Orenco AX-Max unit.
4. Pursuant to 15A NCAC 02T . 0704(j), 02T . 0708, and Application Instruction O, submit a
Residuals Management Plan that shall include at a minimum:
A detailed explanation of how generated residuals (including trash, sediment, and grit)
will be collected, handled, processed, stored, treated, and disposed.
An evaluation of the modified 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 removal and collection are a designed unit process, submit an oil/grease
disposal plan detailing how the oil/grease will be collected, handled, processed, stored, and
disposed.
Trash, sediment and grit is filtered from the influent by the fine helical screen and
deposited in a dumpster. These solids are picked up by a trash hauler and disposed of
properly in a landfill. All other residuals will be hauled off and properly disposed of by
AtlanticOBX, please see the attached "Willingness to Serve Letter".
4721 W. Eckner St., Kitty Hawk, North Carolina [phone]

Joseph J. Anlauf, P.E.
Firm License P-0929
Please review and approve the attached and please call or email with questions.
Sincerely,
Anlauf Engineering, PLLC
Joseph J. Anlauf, PE
Encl.: as stated
Cc: Ed Kiley
Robert Tankard
4721 W. Eckner St., Kitty Hawk, North Carolina [phone]

Technical Specifications
for
Riversound WWTP
3,350 gpd Interim Wastewater Treatment Facility
Prepared for:
Riversound Property Owners Association, Inc.
P.O. Box 572
Edenton, North Carolina 27932
Prepared by:
Anlauf Engineering, PLLC
Civil Engineering Services
4721 W. Eckner Street
Kitty Hawk, North Carolina 27949
[phone]
E-mail: [e-mail]
Project Number: P1501
March 6, 2022
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Riversound Wastewater Treatment Plant
3,350 gpd Interim Treatment Facility
Technical Specification Manual
September 12, 2022
Table of Contents
Division 31
- Earthwork
31 00 00
Earthwork
31 1000
Site Clearing
3123 17
Trenching and Backfilling
312319
Dewatering
312500
Erosion and Sedimentation Controls
Division 33 - Utilities
33 05 24 Horizontal Directional Drilling
33 34 00 Sanitary Utility Sewerage Forcemains
Division 46 - Water and Wastewater Equipment
46 53 00 Biological Treatment Systems - Wastewater Process Equipment

Division 31

P1501
SECTION 3100 00 - EARTHWORK
PART 1 - GENERAL
1.01 RELATED DOCUMENTS
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
A. Drawings and general provisions of Contract, including General and Supplementary
Conditions and Division 00 and Division 01 Specification Sections, apply to this Section.
1.02 SUMMARY
A. This Section includes the preparation of the subgrade for placement of the forcemain to
the High Rate Infiltration Basin
1. Refer to Section 33 34 00 for Sewage Utility Sewerage Forcemain specifications.
1.03 DEFINITIONS
A. Excavation: Excavation consists of removal of material encountered to subgrade elevations
indicated and subsequent disposal of materials removed.
B. Unauthorized Excavation: Unauthorized excavation consists of removal of materials
beyond indicated subgrade elevations or dimensions without specific direction of
Engineer. Unauthorized excavation shall be at Contractor's expense.
C. Subgrade: The undisturbed earth or the compacted soil layer immediately below granular
subbase, drainage fill, or topsoil materials.
D. Structure: Buildings, foundations, slabs, tanks, curbs, or other man-made stationary
features occurring above or below ground surface.
E. Topsoil: Topsoil is defined as soil found in a depth of not more than 18 inches from existing
ground surface.
F. Undercut: Soil excavation deeper than 18 inches below existing ground surface.
1.04 QUALITY ASSURANCE
A. Applicable Codes and Standards:
1. North Carolina Department of Transportation (NCDOT) Standard Specifications for
Roads and Structures latest edition.
SECTION 3100 00 EARTHWORK PAGE - 1

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
B. Testing and Inspection Service: The Owner will, at their discretion, employ and pay for a
qualified independent geotechnical testing and inspection laboratory EARTHWORK 3100
00 (Geotech) to perform soil testing and inspection services during the work. Contractor
to schedule Geotech at applicable phases of the work.
C. Finish Subgrade Elevation: Final subgrade elevation shall be within 0.05' of plan elevations.
1.05 SITE CONDITIONS
A. Existing Utilities: Locate existing underground utilities in areas of excavation work. If
utilities are indicted to remain in place, provide adequate means of support and protection
during earthwork operations. Call North Carolina One Call 800-632-4949.
1. Should uncharted, or incorrectly charted, piping or other utilities be encountered
during excavation, consult utility owner immediately for directions. Cooperate
with utility companies in keeping respective services and facilities in operation.
Repair damaged utilities to satisfaction of utility owner.
2. Do not interrupt existing utilities serving facilities occupied by others, during
occupied hours, except when permitted in writing by Engineer and then only after
acceptable temporary utility services have been provided.
3. Provide minimum of 48-hour notice to Engineer, Owner, and User and receive
written notice to proceed before interrupting any utility.
4. Demolish and completely remove from site existing underground utilities
indicated to be removed. Coordinate with utility companies for shutoff of services
if lines are active.
B. Use of Explosives:
1. Use of explosives is not permitted.
C. Protection of Persons and Property:
1. Barricade open excavations occurring as part of this work and post with warning
lights.
2. Operate warning lights as recommended by authorities having jurisdiction.
3. Protect structures, utilities, sidewalks, pavements, and other facilities from
damage caused by settlement, lateral movement, undermining, washout, and
other hazards created by earthwork operations.
4. Perform excavation by hand within dripline of large trees to remain. Protect root
systems from damage or dry -out to the greatest extent possible. Maintain moist
condition for root system and cover exposed roots with moistened burlap.
5. Contractor to establish and maintain positive drainage throughout the work area
SECTION 3100 00 EARTHWORK PAGE - 2

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
to prevent deterioration of subgrade within pavement, sidewalk, driveways, and
any building areas.
PART 2- PRODUCTS
2.01 SOIL MATERIALS
A. Satisfactory soil materials are defined as those complying with ASTM D2487 soil
classification groups SW, SP, SP-SM, and SM, unless otherwise approved by Owner's
Geotech.
B. Unsatisfactory soil materials are defined as those complying with ASTM D2487 soil
classification groups SC, CL, ML, OL, CH, MH, OH, and PT.
C. Subbase Material: Naturally or artificially graded mixture of natural or crushed gravel,
crushed stone, crushed slag, and natural or crushed sand.
D. Backfill and Fill Materials: Satisfactory soil materials free of plastic clay, rock or gravel
larger than 2 inches in any dimension, debris, waste, frozen materials, vegetation and
other deleterious matter.
PART 3- EXECUTION
3.01 EXCAVATION
A. Excavation is unclassified and includes excavation of all muck, rock, and other materials
required to obtain subgrade elevations indicated, regardless of character of materials and
obstructions encountered.
B. Earth excavation includes excavation of pavements and other obstructions visible on
surface; underground structures, utilities, and other items indicated to be demolished and
removed; together with earth and other materials encountered that are not classified as
rock or unauthorized excavation.
C. Proof -roll subgrades before filling with satisfactory soils and I or aggregate base course
materials. Proof -rolling shall be done under the observation of the Owner's Geotech and /
or Owner's Engineer. Proof -rolling shall be done with a fully loaded tandem dump truck to
identify soft pockets and / or areas of excessive yielding.
D. If unsuitable bearing materials are encountered, at the required subgrade elevations, the
Contractor shall notify the Engineer. The Engineer and/or the Geotech shall make the
determination as to the delineation and management of the unsuitable bearing materials.
SECTION 3100 00 EARTHWORK PAGE - 3

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
If a detailed delineation of the extent of the unsuitable bearing material is required, the
Contractor, at the direction of the Engineer and/or the Geotech, shall prepare a
topographic survey of the area with unsuitable bearing materials. The topographic survey
shall consist of topographic shots taken on an appropriate scale grid pattern that
encompasses the entire area in EARTHWORK 02200-3 question. Grid pattern shall be
approved by Engineer and survey work shall be done under the observation of the Owner's
Geotech and/or Engineer. After removal of unsuitable material, and before placement of
suitable fill, the Contractor shall conduct a second topographical survey with shots taken
on a like scale grid pattern. These surveys will be used as the basis for determining the
amount of under -excavation and basis for payment for additional fill material. The
surveys to be prepared for determining the quantity of under -excavation shall be at the
Contractor's expense and shall be prepared by a North Carolina Registered Land Surveyor.
No action shall be taken without authorization by the Owner, Engineer, and Geotech.
E. Earth excavation includes excavation under building footings, slabs on grade, and or
driveways.
F. Excavation of materials within the perimeter drain system and the high rate infiltration
disposal bed area must be done to remove all soil materials above and including the "BCg"
soils group. See Plan Sheet D4. Subsurface soil materials are inherently irregular.
Excavations of these areas must be performed to a minimum elevation of 5.0' MSL. The
geotechnical engineer, licensed soil scientist, or hydrogeologist described under
specification section 3.06, B, 5., shall be responsible for confirming that the proper depth
in these areas has been acheived. All materials deemed unsuitable or marginally suitable
within these areas shall be removed.
3.02 STABILITY OF EXCAVATIONS
A. General: Comply with Federal, State and local codes, ordinances and requirements of
agencies having jurisdiction.
B. Slope sides of excavations to comply with Federal, State and local codes, ordinances and
requirements of agencies having jurisdiction. Shore and brace where sloping is not possible
because of space restrictions or stability of material excavated. Maintain sides and slopes
of excavations in safe condition until completion of backfilling.
C. Shoring and Bracing: Provide materials for shoring and bracing, such as sheet piling,
uprights, stringers, and cross braces, in good serviceable condition. Maintain shoring and
bracing in excavations regardless of time period excavations will be open. Extend shoring
and bracing as excavation progresses. Contractor shall be responsible for reviewing OSHA
and other applicable regulations for shoring and bracing and submit drawings in
accordance with the regulations to the Engineer prior to commencement of work. When
SECTION 3100 00 EARTHWORK PAGE - 4

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
required by OSHA, drawings shall be sealed by a properly licensed professional engineer.
D. Provide permanent steel sheet piling or properly treated timber sheet piling wherever
subsequent removal of sheet piling might permit lateral movement of soil under adjacent
structures. Cut off tops a minimum of 2 ft.-6-inches below final grade and leave
permanently in place.
3.03 DEWATERING
A. Prevent surface water and subsurface or ground water from flowing into excavations and
from flooding project site and surrounding area.
1. Do not allow water to accumulate in excavations. Remove water to prevent
softening of excavation areas and any undercut areas that may cause soil changes
detrimental to stability of subgrade and other excavated areas. Provide and
maintain pumps, well points, sumps, suction and discharge lines, and other
dewatering system components necessary to EARTHWORK 02200-4 convey water
away from excavations.
2. Establish and maintain temporary drainage ditches and other diversions outside
excavation limits to convey ground water, rain water and water removed from
excavations to collecting or runoff areas. Do not use trench excavations as
temporary drainage ditches.
3.04 STORAGE OF EXCAVATED MATERIALS
A. Stockpile excavated materials acceptable for backfill and fill where directed. Place,
grade, and shape stockpiles for proper drainage.
1. Locate and retain soil materials away from edge of excavations.
2. Slope all temporary and /or permanent stockpiled materials to prevent slope
failures.
B. Dispose of excess excavated soil material and materials not acceptable for use as backfill
or fill in legal disposal area.
3.05 EXCAVATION FOR PAVEMENTS
A. Cut surface under pavements to comply with cross -sections, elevations and grades as
indicated.
3.06 BACKFILL AND FILL
SECTION 3100 00 EARTHWORK PAGE - 5

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
A. General: Place soil material in layers to required subgrade elevations, for each area
classification listed below, using materials specified in Part 2 of this Section.
1. Under grassed areas, use satisfactory excavated or borrow material.
2. Under walks and pavements, use subbase material, satisfactory excavated or
borrow material, or a combination.
3. Within existing agricultural ditches.
3.07 SUBGRADE PREPARATION AND COMPACTION
A. Surface Preparation Recommendations:
1. Remove all vegetation, topsoil, organic and unsuitable materials. Proof -roll
subgrades before filling with satisfactory soils and/or aggregate base course
materials. Proof -rolling shall be done under the observation of the Owner's
Geotech and/or Owner's Engineer. Proof -rolling shall be done with a fully loaded
tandem dump truck to identify soft pockets and I or areas of excessive yielding.
2. Plow strip, or break up sloped surfaces steeper than 1 vertical to 4 horizontal to a
depth of 6" ± so that fill material will bond with existing surface.
3. When existing ground surface has a density less than that specified under
"Compaction" for particular area classification, break up ground surface, pulverize,
moisture -condition to optimum moisture content, and compact to required depth
and percentage of maximum density.
B. Place backfill and fill materials in layers not more than 8 inches in loose depth for material
compacted by heavy compaction equipment, and not more than 4 inches in loose depth
for material compacted by hand -operated tampers.
C. Before compaction, moisten or aerate each layer as necessary to provide optimum
moisture content. Compact each layer to required percentage of maximum dry density or
relative dry density for each area classification. Do not place backfill or fill material on
surfaces that are muddy, frozen, or contain frost or ice.
D. Place backfill and fill materials evenly adjacent to structures, piping, or conduit to required
elevations. Prevent wedging action of backfill against structures or displacement of piping
or conduit by carrying material uniformly around structure, piping, or conduit to
approximately same elevation in each lift.
E. Control soil and fill compaction, providing minimum percentage of density specified for
each area classification indicated below. Correct improperly compacted areas or lifts as
directed by Owner provided Geotech if soil density tests indicate inadequate compaction.
SECTION 3100 00 EARTHWORK PAGE - 6

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
F. Compaction:
1. Natural soils shall be compacted to a dry density of at least 95% of the modified
Proctor maximum dry density (ASTM D1557).
2. Fill material shall be compacted to a dry density of at least 95% of the modified
Proctor maximum dry density (ASTM D1557).
G. Moisture Control: Where subgrade or layer of soil material must be moisture conditioned
before compaction, uniformly apply water to surface of subgrade or layer of soil material.
Apply water in minimum quantity as necessary to prevent free water from appearing on
surface during or subsequent to compaction operations.
H. Remove and replace, or scarify and air dry, soil material that is too wet to permit
compaction to specified density.
Stockpile or spread soil material that has been removed because it is too wet to permit
compaction. Assist drying by discing, harrowing, or pulverizing until moisture content is
reduced to a satisfactory value.
3.08 GRADING
A. General Uniformly grade areas within limits of grading under this Section, including
adjacent transition areas. Smooth finished surface within specified tolerances, compact
with uniform levels or slopes between points where elevations are indicated or between
such points and existing grades.
B. Finish surfaces free from irregular surface changes and as follows:
1. Pavements: Shape surface of areas under pavement to line, grade, and
cross-section, with finish surface not more than 1/2 inch above or below required
subgrade elevation.
C. Compaction: After grading, compact subgrade surfaces to the depth and indicated
percentage of maximum or relative density for each area classification.
3.09 FIELD QUALITY CONTROL
A. Quality Control Testing During Construction:
1. All stripping of topsoil, excavation, proof -rolling, selection and compaction of fill
shall be under the direct control of the Geotech hired by, retained and paid for by
the Owner and approved by the Engineer. The Contractor, Geotech, and Engineer
SECTION 3100 00 EARTHWORK PAGE - 7

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
shall establish a program that provides the necessary field supervision, field or
laboratory testing and other quality control monitoring and testing which may be
required in order to meet the requirements of all site work.
2. Perform field density tests in accordance with ASTM D 1556.
3. Field density tests may also be performed by the nuclear method in accordance
with ASTM D 2922, providing that calibration curves are periodically checked and
adjusted to correlate to tests performed using ASTM D 1556. In conjunction with
each density calibration check, check the calibration curves furnished with the
moisture gages in accordance with ASTM D 3017.
4. If field tests are performed using nuclear methods, make calibration checks of
both density and moisture gages at beginning of work, on each different type of
material encountered, and at intervals as directed by the Owner's Geotech.
5. Percent of Maximum Dry Density Requirements: As described in 3.07 F of this
Section.
B. Paved Areas: Perform at least one field density test of subgrade for every 6,000 sq.ft. of
paved area, but in no case fewer than three (3) tests per area of work tested per event.
C. Compacted Fill for Paved Areas: In each compacted fill layer, perform one field density
test for every 6,000 sq.ft. every other lift of overlaying paved area, but in no case fewer
than three (3) tests per area of work tested per event.
3.10 EROSION CONTROL
A. Provide erosion control methods in accordance with Section 3125 00 - Erosion and
Sediment Control and the North Carolina Department of Environment & Natural
Resources, Land Quality Section.
3.11 MAINTENANCE
A. Protection of Graded Areas: Protect newly graded areas from traffic, standing water, and
erosion. Keep free of trash and debris.
B. Repair and re-establish grades in settled, eroded, and rutted areas to specified tolerances.
C. Reconditioning Compacted Areas: Where completed compacted areas are disturbed by
subsequent construction operations or adverse weather, scarify surface, reshape, and
compact to required density prior to further construction.
D. Settling: Where settling is measurable or observable at excavated areas during general
project warranty period, remove surface (pavement, lawn, or other finish), add backfill
material, compact, and replace surface treatment. Restore appearance, quality, and
SECTION 3100 00 EARTHWORK PAGE - 8

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
condition of surface or finish to match adjacent work, and eliminate evidence of
restoration to greatest extent possible.
3.12 DISPOSAL OF EXCESS AND WASTE MATERIALS
A. Removal from Owner's Property: Remove waste materials, including unacceptable
excavated material, trash, and debris, and dispose of it off Owner's property in a legal
manner.
END OF SECTION 3100 00
SECTION 3100 00 EARTHWORK PAGE - 9

P1501
SECTION 3110 00 -SITE CLEARING
PART 1 - GENERAL
1.01 RELATED DOCUMENTS
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
A. Drawings, and general provisions of Contract, including general and Supplementary
Conditions and Division 1, Specification Sections apply to this Section.
1.02 SUMMARY
A. This Section includes, but is not limited to the following:
1. Protection of existing vegetation.
2. Removal of vegetation.
3. Topsoil stripping.
4. Clearing and grubbing.
5. Removing above -grade improvements.
6. Removing below -grade improvements.
1.03 PROJECT CONDITIONS
A. Traffic:
1. Conduct site clearing operations to ensure minimum interference with roads,
streets, walks and other adjacent occupied or used facilities. Do not close or
obstruct streets, walks or other occupied or used facilities without permission
from the Owners or NCDOT.
B. Protection of Existing Improvements:
1. Provide protections necessary to prevent damage to existing improvements
indicated to remain in place.
2. Restore damaged improvements to their original condition, as acceptable to
property owners.
C. Protection of Existing Trees and Vegetation:
1. Protect existing vegetation indicated to remain in place during preconstruction
meeting, or outside the limits of grading, against unnecessary cutting, breaking
or skinning of roots. Provide adequate temporary guards to protect trees and
vegetation to be left standing.
2. Repair or replace vegetation damaged by construction operations, in a manner
SECTION 3110 00 SITE CLEARING PAGE - 1

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
acceptable to the Owner.
3. Replace vegetation which cannot be repaired and restored to full -growth status,
as determined by Owner.
PART 2- PRODUCTS
Not Applicable to this Section
PART 3- EXECUTION
3.01 SITE CLEARING
A. General
1. Remove trees, shrubs, grass and other vegetation, improvements, or other
obstructions as required to permit installation of new construction. Remove
similar items elsewhere on site or premises as specifically indicated. "Removal"
includes digging out and off -site disposing of stumps and roots.
2. Cut minor roots and branches of trees indicated to remain in a clean and careful
manner, where such roots and branches obstruct installation of new construction.
B. Topsoil
1. Topsoil is defined as soil found in a depth of not more than 18 inches from existing
ground surface. Satisfactory topsoil is reasonably free of subsoil, clay lumps,
stones, and other objects over 2 inches in diameter, and without weeds, roots, and
other objectionable material.
2. Under new pavement areas outside of existing pavement areas strip topsoil
encountered in a mannerto prevent intermingling with underlying subsoil or other
objectionable material. Topsoil stripping shall extend (2) feet beyond all paving
limits.
3. Remove growths of grass or other vegetation from areas before stripping.
4. Dispose of unsuitable or excess topsoil same as specified for disposal of waste
material.
C. Clearing & Grubbing
1. Clear site of trees, shrubs and other vegetation, except for those indicated to
remain during preconstruction meeting and those outside clearing limits.
2. Completely remove stumps, roots and other debris protruding through ground
surface.
3. Fill depressions caused by clearing and grubbing operations with satisfactory soil
SECTION 3110 00 SITE CLEARING PAGE - 2

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
material, unless further excavation or earthwork is indicated. Place fill material in
horizontal layers in accordance with Section 3100 00 Earthwork, 3.07 B.
D. Removal of Improvements
1. Remove existing above -grade and below -grade improvements as indicated and as
necessary to facilitate new construction. For the specified sections of roadways to
be rebuilt or otherwise improved, remove all existing asphalt pavement. The
asphalt pavement removed from this street section may be milled and utilized as
reclaimed material to be used in combination with aggregate base materials.
Reclaimed asphalt shall be submitted for testing of gradation and materials and
satisfactorily pass test prior to use as subbase.
E. Site Drainage
1. Contractor to maintain positive drainage throughout the Site Clearing operation
so as to avoid standing water on work surfaces.
3.02 DISPOSAL OF WASTE MATERIALS
A. Burning is permitted if allowed by local authorities. Contractor is responsible for obtaining
any local burning permits.
B. Remove waste materials and unsuitable or excess topsoil from property and dispose of in
a legal manner.
END OF SECTION 3110 00
SECTION 3110 00 SITE CLEARING PAGE - 3

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
SECTION 3123 17—TRENCHING AND BACKFILLING
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. N/A
1.2 SUMMARY
A. Section Includes:
1. Excavating trenches for utilities.
2. Compacted fill from top of utility bedding sub -grades or finish grades.
3. Backfilling and compaction.
1.3 MEASUREMENT AND PAYMENT
A. Unclassified excavation:
1. No measurement or direct payment will be made for the Work under this Section and
all costs for same shall be included in the price bid for the utility or stainless steel
horizontal well screen perimeter groundwater lowering system piping or structure to
which it pertains.
1.4 REFERENCES
A. American Association of State Highway and Transportation Officials:
1. AASHTO T180 - Standard Specification for Moisture -Density Relations of Soils Using a
4.54-kg (10-Ib) Rammer and a 457-mm (18-in.) Drop.
2. ASTM C136 - Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates.
3. ASTM D698 - Standard Test Method for Laboratory Compaction Characteristics of Soil
Using Standard Effort (12,400 ft-Ibf/ft3 (600 kN-m/m3)).
4. ASTM D1556 - Standard Test Method for Density of Soil in Place by the Sand -Cone
Method.
5. ASTM D1557 - Standard Test Method for Laboratory Compaction Characteristics of Soil
Using Modified Effort (6,000 ft-Ibf/ft3 (2,700 kNm/m3)).
6. ASTM D2167 - Standard Test Method for Density and Unit Weight of Soil in Place by
the Rubber Balloon Method.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 1

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
7. ASTM D2922 - Standard Test Method for Density of Soil and Soil -Aggregate in Place by
Nuclear Methods (Shallow Depth).
1.5 DEFINITIONS
A. Off -Site Select Borrow: Approved soil material obtained off -site when specified or when
sufficient approved soil material is not available from excavations.
B. Unsuitable Soil: Soil produced from excavation of drainage features, cut to sub -grade, or
required stripping that does not meet the definition and requirements of suitable soil.
C. Suitable Soil: Soil produced from excavation of drainage features, cut to sub -grade, or required
stripping that meets the definition and requirements of suitable soil.
D. Topsoil: Soil produced from stripping the top or upper 4-8" soil layer from areas to be further
excavated, re -landscaped, or re -graded without contamination from the subsoil. Stripping of
topsoil is not required where excavation width is less than 10' or for the installation of pipe
utilities. Topsoil shall be stockpiled on site at designation location for further use. Topsoil shall not
be removed from site.
E. Backfill: Soil material or controlled low -strength material used for fill and excavation.
F. Base Course: The layer placed between the sub -grade and surface pavement in a paving
system.
G. Excavation: Removal of material encountered above sub -grade elevations and to the lines and
dimensions indicated.
H. Fill: Soil materials used to raise existing grades.
I. Porous Fill: Fill material supporting the slab on grade that also minimizes upward capillary flow
of water.
J. Structures: Buildings, slabs, curbs, utility appurtenances, tanks, retaining walls or other man-
made stationary features constructed above or below ground surface.
K. Sub -grade: The uppermost surface of an excavation or the top surface of a fill or backfill
immediately below topsoil materials.
L. Unauthorized excavation: Removal of materials beyond indicated sub -grade elevations or
dimensions without direction by the Engineer. Unauthorized excavation, as well as remedial work
directed by the Engineer, shall be at the Contractor's expense.
M. Undercut excavation: Excavation below sub -grade elevations or beyond indicated lines and
dimensions as directed by Engineer. Authorized undercut excavation and replacement material
will be paid for according to Contract unit price for UNDERCUT and BACKFILL.
N. Utilities: On -site underground pipes, conduits, ducts and cables.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 2

P1501
1.6 SUBMITTALS
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
A. Material Test Reports: Interpreted test results from a qualified testing agency shall be
submitted indicating compliance of test results with the following indicated requirements:
1. Classification according to ASTM D 2487 of each on -site and borrow soil material
proposed for fill and backfill.
2. Laboratory compaction curve according to ASTM D 698 for each on -site and borrow
soil material proposed for fill and backfill.
B. Excavation Protection Plan: Describe sheeting, shoring, and bracing materials and installation
required to protect excavations and adjacent structures and property; include structural
calculations to support plan.
C. Manufacturer's data on detectable warning tape.
1.7 QUALITY ASSURANCE
A. Perform work and provide materials in accordance with North Carolina Department of
Transportation Standard Specifications for Roads and Structures, latest edition.
B. North Carolina Erosion and Sediment Control Planning and Design Manual.
C. Geotechnical Testing Agency Qualifications: An independent testing agency qualified according
to ASTM E 329 to conduct soil materials and rock -definition testing, as documented according to
ASTM D 3740 and ASTM E 548.
1.8 QUALIFICATIONS
A. Use an adequate number of skilled workmen who are thoroughly trained and experienced in
the necessary crafts and who are completely familiar with the specified requirements and the
methods needed for proper performance of the work of this Section
B. Use a sufficient number of equipment of adequate size and capacity to accomplish the work in
a timely manner.
1.9 JOB CONDITIONS
A. Existing Utilities:
1. In the construction areas, there are now waterworks, storm drainage, sanitary sewers,
street paving, gas mains and other utilities.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 3

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
2. The approximate locations of certain underground lines and structures are shown on
the drawings for information only. Other underground lines and structures are not
shown.
3. Locate these and other possible unknown utility lines using an electronic pipe finder or
other approved means.
4. Locate, excavate, and expose all existing underground lines before beginning trenching
operations.
5. The Contractor will be held responsible for the workmanlike repair of any damage
done to any of these utilities in the execution of his work under this Section.
6. The Contractor shall familiarize himself with the existing conditions of these utilities.
He shall be prepared to adequately safeguard himself, the utilities, and the Owner from
damage.
B. Utility Notification:
1. Call North Carolina 811 service at 811 or 1-800-632-4949 not less than three working
days before performing work.
C. Protecting Trees, Shrubbery, and Lawns:
1. Trees and shrubbery in developed areas and along the trench line shall not be
disturbed unless absolutely necessary and subject to the approval of the Engineer.
2. Any trees and shrubbery for which removal is necessary shall be heeled in and
replanted.
3. Where trenches cross private property through established lawns, sod shall be cut,
removed, stacked and maintained in suitable condition until replacement is approved by
the Engineer.
4. Topsoil underlying lawn areas shall be removed and kept separate from general
excavated materials.
D. Clearing:
1. Perform all clearing necessary for installation of the complete work.
2. Clearing shall be performed in accordance with Section 3110 00 Site Clearing.
E. Removing and Resetting Fences:
1. Where existing fences must be removed to permit construction of utilities:
a. Remove such fences and, as the Work progresses, reset the fences in their
original location and condition.
b. Fencing must be replaced at the end of each working day.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 4

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
F. Restoration of Disturbed Areas:
1. Restore all areas disturbed by, during, or as a result of construction activities to their
previous or better condition.
1.10 FIELD MEASUREMENTS
A. Verify field measurements prior to fabrication.
1.11 COORDINATION
A. Verify Work associated with lower elevation utilities is complete before placing higher
elevation utilities.
PART 2 PRODUCTS
2.1 SOIL MATERIALS
A. Suitable Soils: ASTM D 2487 Soil Classification Groups GW, GP, GM, GC, SW, SP, and SM or a
combination of these groups; free of: rock or gravel larger than 1-1/2 inches in any dimension,
debris, waste, frozen materials, vegetation, and other matter.
B. Unsuitable Soils: ASTM D 2487 Soil Classification Groups SC, ML, CL, OL, MH, CH, OH, and PT or
a combination of these groups.
1. Unsuitable soils also include suitable soils not maintained within 2 percent of optimum
moisture content at time of compaction and all soils not meeting the requirements for
suitable soils.
C. Native material: Soils as excavated from the trench excavation. Where specifically directed by
the Engineer, native material may be used for trench backfill.
D. Porous Fill/Course Type 1 Sand Soil: ASTM D 2487 soil classification groups GW, GP, SW, or SP
with a maximum aggregate size of 1.0 inch and no more than 5 percent passing the No. 200 sieve.
E. Sand: ASTM C 33; fine aggregate, natural, or manufactured sand.
F. Utility/stone bedding material: NCDOT #67 or #57.
G. Horizontal Well Screen Groundwater Lowering Perimeter Pipe bedding: Silica Sieved Gravel
Pack #2 from Southern Products & Silica Company
H. Aggregate Base Course Material: NCDOT ABC.
2.2 EXCAVATED MATERIALS
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 5

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
A. Perform all excavation of every description and of whatever substances encountered to depths
indicated or specified.
B. Pile material suitable for backfilling in an orderly manner at a safe distance from banks or
trenches to avoid overloading and to prevent slides or cave-ins.
C. Remove and deposit unsuitable or excess material as directed by the Engineer.
2.3 ACCESSORIES
A. Detectable Warning Tape for Metallic and Nonmetallic Pipe Materials: Acid- and alkali resistant
polyethylene film warning tape manufactured for marking and identifying underground utilities, 6
inches wide and 4 mils thick minimum, continuously inscribed with a description of the utility,
with metallic core encased in a protective jacket for corrosion protection, detectable by metal
detector when tape is buried up to 2'-6" deep.
B. Tape Colors: Provide tape colors to utilities as follows:
1. Red: Electric.
2. Yellow: Gas.
3. Orange: Telephone and other communications.
4. Blue: Water systems.
5. Green: Sanitary Sewer and Storm Sewer systems.
6. Brown: Sewer Force Mains.
PART 3 EXECUTION
3.1 LINES AND GRADES
A. Lay pipes to lines and grades indicated on Drawings.
1. Engineer reserves right to make changes in lines, grades, and depths of utilities
when changes are required for Project conditions.
B. Use laser -beam instruments with qualified operator to establish lines and grades.
3.2 EXAMINATION AND PREPARATION
A. Call NC One Call service at 1-800-632-4949 not less than three working days before performing
work.
B. Identify required lines, levels, contours, and datum locations.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 6

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
C. Notify Engineer of unexpected subsurface conditions and discontinue affected work in area
until notified to resume work.
3.3 PROTECTION OF UTILITIES
A. Unless shown to be removed, protect active utility lines shown on the drawings or otherwise
make them known to the Contractor prior to trenching. If damaged, repair or replace at no
additional cost to the Owner.
B. If active utility lines are encountered and are not shown on the Drawings or otherwise made
known to the Contractor, promptly take necessary steps to assure that service is not interrupted.
C. If service is interrupted as a result of work under this Section, immediately restore service by
repairing the damaged utility at no additional cost to the Owner.
D. If existing utilities are found to interfere with the permanent facilities being constructed under
this Section, immediately notify the Engineer and secure his instructions.
E. Do not proceed with permanent relocation of utilities until written instructions are received
from the Engineer.
F. Locations within streets or highways:
1. Take all precautions and comply with all requirements as may be necessary to protect
the improvements, including barricades for protection of traffic.
2. Keep a minimum of one lane open to traffic at all times where utility crosses street or
highway.
3.4 PROTECTION OF PERSONS AND PROPERTY
A. Barricade open holes and depressions occurring as part of the Work, and post warning lights
on property adjacent to or with public access.
B. Operate warning lights during hours from dusk to dawn each day and as otherwise required.
C. Protect structures, utilities, sidewalks, pavements, and other facilities from damage caused by
settlement, lateral movement, washout and other hazards created by operations under this
Section.
D. Protect plant life, lawns, and other features remaining as portion of final landscaping.
E. Protect benchmarks, existing structures, fences, sidewalks, paving, and curbs from excavating
equipment and vehicular traffic.
F. Establish temporary traffic control and detours, when necessary, when trenching is performed
in public right-of-way. Relocate controls and reroute traffic as required during progress of Work.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 7

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
3.5 DEWATERING
A. Prevent surface water and groundwater from entering excavations, from ponding on prepared
sub -grades, and from flooding project site and surrounding area.
B. Protect sub -grades from softening, undermining, washout, and damage by rain or water
accumulation.
1. Reroute surface water runoff away from excavated areas. Do not allow water to
accumulate in excavations.
2. Establish and maintain temporary drainage ditches and other diversions outside
excavation limits to convey rain water and water removed from excavation as temporary
drainage ditches.
3. Do not use excavated trenches as temporary drainage ditches.
C. Maintain the water level below the excavation sub -grade during excavation and construction.
1. Material disturbed below the foundation sub -grade due to improper dewatering shall
be removed and replaced with stone bedding material at no expense to the Owner.
2. Dewatering by trench pumping will not be permitted if migration of fine grained
natural material (running sand) from bottom, side walls, or bedding material will occur.
D. Dispose of water pumped from excavations into ditches or storm drains having the capacity to
handle the volume of pumped water.
1. Contractor is responsible for acquiring all permits required to discharge the water and
shall protect waterways from turbidity during the operation.
2. Prevent flooding of streets, roadways, or private property.
3. Provide noise attenuated engines when pumps will operate within 500 feet of a
residence or commercial establishment.
3.6 TRENCHING
A. Excavate for utilities to the lines and grades per the drawings.
B. Cut trenches sufficiently wide to enable installation of utilities and allow inspection.
C. Do not advance open trench more than 400 feet ahead of installed pipe.
D. Excavate trenches to depth indicated on Drawings. Provide uniform and continuous bearing
and support for bedding material and utility.
E. Do not interfere with 45 degree bearing splay of foundations.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 8

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
F. When Project conditions permit, slope side walls of excavation starting 2 feet above top of
pipe. When side walls cannot be sloped, provide sheeting and shoring to protect excavation as
specified in this section.
G. When subsurface materials at bottom of trench are loose or soft notify Engineer, and request
instructions.
H. Hand trim excavation and leave free of loose matter. Hand trim for bell and spigot pipe joints.
I. Stockpile excavated material that is suitable for re -use as directed in 3100 00 Earthwork, 3.04
Storage of Materials.
J. Remove from site any excavated material that is unsuitable for re -use.
K. Where trenching occurs in existing lawns, remove turf in sections and keep damp. Replace turf
upon completion of the backfilling.
L. Open cut:
1. Excavate for utilities by open cut.
2. If conditions at the site prevent such open cut, and if approved by the Engineer,
tunneling may be used.
3. Short sections of a trench may be tunneled if, in the opinion of the Engineer, the
conductor can be installed safely and backfill can be compacted properly into such
tunnel.
M. Special requirements relating to excavation for specific types of utilities shall comply with the
following:
1. Water distribution lines:
a. Do not excavate trench more than 400' ahead of pipe laying, unless permitted
by Engineer
b. Provide depth of cover shown or minimum cover of 36", whichever is greater.
c. Where minimum cover only is required, carry excavations to depths necessary
to properly grade the pipe on tangents and vertical curves as directed by the
Engineer.
d. Provide minimum clearance of 6" between pipe walls and trench walls or
sheeting and bracing lines.
e. If minimum cover of 36" cannot be provided, then thermoplastic piping may
not be used. Use ductile iron piping or other Engineer -approved material.
f. If an unacceptable bearing surface is encountered during excavation, notify the
Engineer immediately. Engineer may authorize excavation below invert elevation
for the introduction of bedding material. Authorized undercut excavation and
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 9

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
replacement material will be paid for according to Contract unit price for
Undercut and Backfill.
g. If authorized bedding material is off -site select borrow or stone bedding
material, they shall be paid for according to the respective unit price.
h. If bedding material is required, pipe must be supported during placement and
compaction of such material.
2. Sewer utilities:
a. Comply with requirements of Section 33 34 00 Sanitary Utility Sewerage
Forcemains.
b. Do not excavate trench more than 200' ahead of pipe laying, unless permitted
by Engineer.
c. Maintain trench sides vertical to point not less than 2' above top of pipe.
d. Upper portion of trench may be sloped to any width which will not cause
damage to adjoining structures, utilities, pavements or private property.
e. If an unacceptable bearing surface is encountered during excavation, notify
the Engineer immediately. Engineer may authorize excavation below invert
elevation for the introduction of additional bedding material. Authorized
undercut excavation and replacement material is included in the bid unit price
for sewer utilities and shall not be billed separately.
f. If authorized bedding material is off -site select borrow or stone bedding
material, they shall be paid for according to the respective unit price.
g. Bedding required by the trench section detail is to be included in the lump sum
price.
h. If additional bedding material is required, pipe must be supported during
placement and compaction of such material.
3. Storm drainage:
a. Comply with requirements of Section 33 4100 Storm Utility Drainage Piping.
b. Do not excavate trench more than 200' ahead of pipe laying, unless permitted
by Engineer.
c. Maintain trench sides vertical to point not less than 2' above top of pipe.
d. Upper portion of trench may be sloped to any width which will not cause
damage to adjoining structures, utilities, pavements or private property.
e. If an unacceptable bearing surface is encountered during excavation, notify
the Engineer immediately. Engineer may authorize excavation below invert
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 10

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
elevation for the introduction of bedding material. Authorized undercut
excavation and replacement material will be paid for according to Contract unit
price for Undercut and Backfill.
f. If authorized bedding material is off -site select borrow or stone bedding
material, they shall be paid for according to the respective unit price.
g. If bedding material is required, pipe must be supported during placement and
compaction of such material.
N. Correct over -excavated areas with compacted backfill as specified for authorized excavation or
replace with fill concrete as directed by Engineer.
3.7 EXCAVATION AND TRENCH SAFETY
A. During excavations, material suitable for backfilling shall be piled in an orderly manner a
sufficient distance from the banks of the trench to avoid overloading, to prevent slides or cave-
ins, and to provide adequate access to the work. The Contractor shall comply with the "Rules and
Regulations Governing the Construction Industry' as promulgated for the Health, Safety &
General Welfare of Employees by the Commission of Labor. Particular attention shall be paid to
the following sections:
1. Where unstable material is encountered in excavations over 5' in depth, the sides of
the excavations shall be shored or sheet piled unless the sides are sufficiently sloped to
eliminate all possibility of a cave-in.
2. Where stable material is encountered in excavations over 5' in depth, the sides of the
excavations shall be shored or braced unless the sides are sufficiently sloped to eliminate
all possibility of a cave-in.
3. Where workmen are engaged near the edge of the excavation, undercutting of bank or
walls is prohibited unless adequately protected.
4. Materials which are excavated shall be placed so that the base of the pile is not less
than 2' from the edge of the excavation.
5. Proper and adequate means of ingress and egress shall be provided at all times from
all excavations and trenches; either by ramps, stairways, or ladders located so as to be
accessible to workmen at all times.
B. In addition to the Safety Provisions specified herein, the Contractor shall comply with the
Department of Labor, Safety & Health Regulations for Construction promulgated under the
Occupational & Health Act of 1970 (PL-596) and under Section 107 of the Contract Work Hours
and Safety Standards Act (PL-91-54). Where the requirements of these acts are in excess of those
requirements specified, the requirements of these acts shall govern.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 11

P1501
3.8 PROJECT -SPECIFIC BACKFILLING
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
A. This particular Project requires the adoption of specific instructions for excavated soil usage
and backfilling:
1. For any trenches with water, sanitary, or storm sewer utilities that are not located
under curb or paved areas, backfill using on -site suitable soil when available.
2. For any trenches with water, sanitary, or storm sewer utilities that are located under
curb or paved areas, backfill using only approved off -site select borrow. These off -site
select borrow quantities are to be included in the lump sum price.
3.9 BACKFILLING
A. Prior to backfilling, remove all debris, trash, organic material, formwork, temporary shoring
and bracing from excavation. Perform all testing and inspection of underground utilities.
B. Place and compact initial backfill of suitable soil material or sub -base material, free of particles
larger than 1 inch, to a height of 12 inches over the utility.
C. Carefully compact material under pipe haunches. Bring backfill up evenly on both sides and
along the full length of utility piping or conduit to avoid damage or displacement of utility system.
D. Install warning tape directly above utilities at 12" below final grade, except 6" below sub -grade
under paved areas and slabs.
E. Final backfill areas to contours and elevations. Use unfrozen and unsaturated materials.
F. Backfill systematically, as early as possible, to allow maximum time for natural settlement. Do
not backfill over -porous, wet, frozen, or spongy sub -grade surfaces.
G. Initial Backfill:
1. Place approved backfill and bedding material in layers of 8 inches maxim umthickness,
and compact with suitable tampers to the density of the adjacent soil until there is cover
of not less than 24" over sewers and 12" over other utilities.
H. Remainder of backfill:
1. Wooded, undeveloped areas and swamps:
a. Place approved backfill and bedding material in layers of 12-18" maximum
thickness, and compact with suitable tampers.
b. Tamping may be ceased when backfill exceeds 30" over the pipe.
c. Mound excess material 6" above grade to provide for settlement.
2. Lawns and unpaved areas:
a. Place approved backfill and bedding material in layers of 12-18" maximum
thickness, and compact with suitable tampers.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 12

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
b. Obtain a compaction of 90% of maximum dry density.
3. Paved areas, slabs on grade, site concrete flatwork and other similar areas:
a. Place approved backfill and bedding material in layers of 8 inches maximum
thickness, and thoroughly compact with heavy duty mechanical tampers.
b. Obtain a compaction of 98% of an ASTM D698 Standard Proctor.
I. Maintain optimum moisture content of backfill materials to attain required compaction density.
1. Uniformly moisten or aerate sub -grade and each subsequent fill or backfill soil layer to
within 2 percent of optimum moisture content before compaction.
2. Remove and replace, or scarify and air dry otherwise suitable soil material that exceeds
optimum moisture content by 2 percent and is too wet to compact to specified dry unit
weight.
J. Do not leave more than 20 feet of trench open at end of working day.
K. Protect open trench to prevent danger to the public.
3.10 TOLERANCES
A. Top Surface of Backfilling Under Paved Areas: Plus or minus one (1) inch required elevations.
B. Top Surface of General Backfilling: Plus or minus one (1) inch from required elevations.
3.11 FIELD QUALITY CONTROL
A. Testing Agency Services: Owner will engage a qualified independent testing agency to perform
field inspections and tests and to prepare test reports. Allow testing agency to inspect and test
each sub -grade and each fill or backfill layer. Do not proceed until test results for previously
completed work verify compliance with requirements.
B. Perform laboratory material tests in accordance with ASTM D698 (Standard Proctor).
C. Perform in place compaction tests in accordance with the following:
1. Density Tests: ASTM D1556 (sand cone) or ASTM D2922 (nuclear) as applicable.
D. Frequency of Tests:
1. Building slab areas: At sub -grade and at each compacted fill and backfill layer, at least 1
test every 2000 sq. ft., but in no case less than 3 tests.
2. Parking areas and roadways: At sub -grade and at each compacted fill and backfill layer,
perform at least one field in place density test every 5000 sq. ft. or less of paved area, but
in no case less than 3 tests.
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 13

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
3. Trench backfill: In paved areas, test as above. In lawns and unpaved areas, test final
backfill layer with one field in -place density test for each 250 feet of trench. In wooded,
undeveloped areas, testing is not required.
E. When testing agency reports that sub -grades, fills, or backfills are below specified density, then
scarify, moisten, aerate, or replace soils. Re -compact and re -test as necessary to achieve required
density.
3.12 PROTECTION OF FINISHED WORK
A. Reshape and re -compact fills subjected to vehicular traffic during construction.
END OF SECTION
SECTION 3123 17 TRENCHING AND BACKFILLING PAGE - 14

P1501
SECTION 3123 19 - DEWATERING
PART 1 - GENERAL
1.01 WORK OF THIS SECTION
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
A. The WORK of this Section includes site dewatering necessary to lower and control
groundwater levels and hydrostatic pressures to permit excavation and construction to be
performed properly under dry conditions.
B. Dewatering operations shall be adequate to assure the integrity of the finished project.
The responsibility for conducting the dewatering operation in a manner which will protect
adjacent structures and facilities rests solely with the CONTRACTOR. The cost of repairing
any damage to adjacent structures and restoration of facilities shall be the responsibility
of the CONTRACTOR.
C. The CONTRACTOR shall bear the sole responsibility for the design, installation, and
operation of the dewatering system to comply with the requirements of this section. The
CONTRACTOR shall be required to install additional dewatering equipment as may be
required throughout the duration of the project to maintain specified groundwater levels.
1.02 RELATED SECTIONS
A. The WORK of the following Section applies to the WORK of this Section. Other Sections of
the Specifications, not referenced below, shall also apply to the extent required for proper
performance of this WORK.
1. Section 3100 00 Earthwork
1.03 STANDARD SPECIFICATIONS
A. Except as otherwise indicated in this Section of the Specifications, the CONTRACTOR shall
comply with all Standard Specifications specified in Division 01.
1.4 SCHEDULE AND PLAN
A. The following shall be submitted in compliance with Division 01 - General Requirements:
1. The CONTRACTOR shall make an independent investigation of the soil and
groundwater conditions at each site. The results of the CONTRACTOR's
independent investigation shall include the results of any and all exploratory
borings, laboratory tests, and analyses. The CONTRACTOR's independent
investigation shall be in report form.
SECTION 3123 19 DEWATERING PAGE - 1

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
2. Prior to commencement of excavation, a detailed plan and schedule, with
description, for dewatering of excavations, piezometers, estimated dewatering
rates, volume and equipment requirements shall be submitted with the
dewatering plan. The qualification of the dewatering system designer shall be
submitted to CONSTRUCTION MANAGER for approval. The CONTRACTOR shall
make an independent investigation of the soil conditions to be dewatered. The
dewatering plan shall be prepared specifically to accommodate soil materials and
groundwater conditions of the site.
3. Demonstration of proposed system and verification that adequate personnel,
materials and equipment are readily available, including standby equipment.
1.5 CONTROL AND OBSERVATION
A. Adequate control shall be maintained to ensure that the stability of excavated and
constructed slopes are not adversely affected by water, that erosion is controlled and that
flooding of excavation or damage to structures does not occur.
B. Where critical structures or facilities exist immediately adjacent to areas of proposed
dewatering, reference points shall be established and observed daily to detect any
settlement which may develop.
1.6 INSPECTION
A. During or after trench excavation, when CONTRACTOR observes sufficient groundwater to
be present that may prevent proper installation of pipe bedding, pipelines, tanks, backfill
and compaction, then CONTRACTOR shall call for inspection of conditions by the
CONSTRUCTION MANAGER. The CONSTRUCTION MANAGER shall inspect the conditions
and determine if unacceptable conditions are present for pipe installation.
B. If unacceptable trench conditions are found by the CONSTRUCTION MANAGER, then the
CONTRACTOR will be authorized to mobilize and start dewatering operations of the
pipeline trench or tank excavation.
C. Damp soils or low volumes of groundwater in the bottom of trenches are not sufficient
cause for trench dewatering.
1.7 MEASUREMENT AND PAYMENT
A. Separate payments shall be made as specified in the contract for providing all dewatering
equipment and apparatus, for mobilization/demobilization of dewatering equipment, and
SECTION 3123 19 DEWATERING PAGE - 2

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
for all dewatering operations.
B. Storm water run-off flowing into the excavation site shall be minimized to the maximum
extent possible. All water entering the excavation site shall be subject to all dewatering
requirements specified in this documents.
C. Protection of adjacent structures from adverse effects of dewatering shall be the
responsibility of the CONTRACTOR.
PART 2 -- PRODUCTS
2.1 EQUIPMENT
A. Dewatering, where indicated, includes deep wells, well points, piezometers, sump pumps,
temporary pipelines for water disposal, and rock or gravel placement, and other means
including standby pumping equipment maintained on the jobsite continuously.
2.2 FOUNDATION ROCK
A. Foundation rock shall be included in the dewatering system to replace weakened soil
within the excavation. Rock shall be 1-1/2 inch maximum crushed stone placed in minimum
12-inch layers and completely wrapped in filter fabric. Foundation rock shall be used in
addition to bedding material shown on the plans and shall be used at the CONTRACTOR'S
discretion, or as directed by the CONSTRUCTION MANAGER. Foundation rock shall be
considered to be part of the dewatering system.
PART 3 - EXECUTION
3.1 GENERAL REQUIREMENTS
A. All water encountered in the trench shall be disposed by the CONTRACTOR in such a
manner as will not damage public or private property or create a nuisance or health
nuisance. The CONTRACTOR shall furnish, install, and operate pumps, pipes, appliances,
and equipment of sufficient capability to keep excavation free from water until the
excavation is backfilled, unless otherwise authorized by the CONSTRUCTION MANAGER.
No dewatering from inside the trench will be permitted while the pipeline is being installed,
unless it is approved by the CONSTRUCTION MANAGER.
B. An adequate system shall be designed, installed and maintained to lower and control the
ground water to permit excavation, construction of structures, and placement of fill
materials to be performed under dry conditions.
SECTION 3123 19 DEWATERING PAGE - 3

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
C. Sufficient dewatering equipment shall be installed to pre -drain the water -bearing strata
below the bottom of foundations, sewers and other excavations.
F. The hydrostatic head in water -bearing strata below foundations, drains, sewers and other
excavations shall be reduced to ensure that the water level are below the excavation
surface at all times.
G. The system shall be placed into operation prior to excavation below ground water level to
lower the ground water level and shall be operated continuously 24 hours a day, 7 days a
week until drains, sewers and structures have been constructed and fill materials have
been placed and dewatering is no longer required. Groundwater will need to remain
depressed until adequate loading from proposed structures and uplift resistance to
buoyant forces can be provided.
H. The site shall be graded to facilitate drainage. Surface runoff shall be diverted from
excavations. Water entering the excavation from surface runoff shall be collected in
shallow ditches around the perimeter of the excavation, drained to sumps, and then be
pumped or drained by gravity away from the excavation and disposed of in compliance
with local, State and Federal regulations.
Dewatering shall at all times be conducted in such a manner as to preserve the undisturbed
bearing capacity of the subgrade soils at proposed bottom of excavation.
If foundation soils are disturbed or loosened by the upward seepage of water or an
uncontrolled flow of water, the affected areas shall be excavated and replaced with
foundation rock completely wrapped in filter fabric at no additional cost to the OWNER.
K. Flotation of structures and facilities shall be prevented by maintaining a positive and
continuous removal of water. The dewatering system shall be in continuous operation until
all structure and pipelines are properly backfilled.
L. If well points or wells are used, they shall be adequately spaced to provide the necessary
dewatering and shall be sandpacked and/or other means used to prevent pumping of fine
sands or silts from the subsurface. A continual check shall be maintained to ensure that
the subsurface soil is not being removed by the dewatering operation..
N. The release of groundwater to its original level shall be performed in such a manner as not
to disturb natural foundation soils, prevent disturbance of compacted backfill and prevent
flotation or movement of structures, pipelines, and sewers.
END OF SECTION 3123 19
SECTION 3123 19 DEWATERING PAGE - 4

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
SECTION 3125 00 - EROSION & SEDIMENTATION CONTROL
PART 1 - GENERAL
1.01 RELATED DOCUMENTS
A. Drawings, and general provisions of Contract, including general and Supplementary
Conditions and Division 1, Specification Sections apply to this Section.
1.02 SUMMARY
A. The extent of the work required under this section is that required to minimize water, air,
and soil erosion and siltation.
B. Temporary erosion control measures which may be necessary include, but are not limited
to, temporary berms, dikes, dams, drainage ditches, silt basins, silt ditches, perimeter
swales, slope drains, structures, vegetation, mulches, mats, netting, gravel or any other
methods or devices that are necessary to control or restrict erosion. Temporary erosion
control measures may include work outside the right-of-way or construction limits where
such work is necessary as a result of construction such as borrow pit operations, haul roads,
plant sites, equipment storage sites, and disposal of waste or debris. The Contractor shall
be liable for all damages to public or private property caused by silting or slides originating
in waste areas furnished by the Contractor.
1.03 SUBMITTALS
A. Silt Fence
1.04 QUALITY ASSURANCE
A. Furnish certification from supplier that materials are as specified.
B. Applicable Codes and Standards:
1. North Carolina Sedimentation Pollution Control Act of 1973, as amended and
revised, and the Rules and Regulations promulgated pursuant to the provisions of
said act.
2. North Carolina Department of Environment and Natural Resources - EROSION AND
SEDIMENT CONTROL PLANNING & DESIGN MANUAL, latest edition, herein
referred to in this Section as the Practice Standards and Specifications.
3. North Carolina Department of Transportation (NCDOT) Standard Specifications for
Roads and Structures latest edition.
4. Contractor is encouraged to contact the County Soil and Water Extension Service
SECTION 3125 00 EROSION & SEDIMENTATION CONTROL PAGE - 1

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
for site specific seeding recommendations.
5. In the event of conflict between the regulations listed above and the requirements
of these specifications, the more restrictive requirement shall apply.
1.05 SANCTIONS
A. Failure on the part of the Contractor to perform the necessary measures to control erosion,
siltations, and pollution will result in the Engineer notifying the Contractor to take such
measures. In the event that the Contractor fails to perform such measures within 24 hours
after receipt of such notice, the Engineer may suspend the work as provided above, or may
proceed to have such measures performed with other forces and equipment, or both. The
cost of such work performed by other forces will be deducted from monies due the
Contractor on his contract.
PART 2- PRODUCTS
2.01 SEEDING
A. Seeding grasses and legumes shall meet the requirements of Section 6.11 of the Practice
Standards and Specifications.
B. Use certified seed for permanent seeding. This seed shall meet published North Carolina
Standards and should bear an official "Certified Seed" label.
2.02 SILT FENCE
A. Silt fence shall be a synthetic filter fabric of at least 95% by weight of polyolefins or
polyester, which is certified by the manufacturer or supplier as conforming to the
requirements of ASTM D 6461.
B. Steel posts shall be a minimum of five (5) feet long made of 1.33 lb / linear foot steel. Posts
shall be secured to fabric in a manner that does not affect the structural integrity of the
fabric.
PART 3- EXECUTION
3.01 GENERAL
A. The Contractor shall take whatever measures are necessary to minimize soil erosion and
siltation, and water, air and noise pollution caused by his operations. The Contractor shall
also comply with the applicable regulations of all legally constituted authorities relating to
pollution prevention and control. The Contractor shall keep himself fully informed of all
SECTION 3125 00 EROSION & SEDIMENTATION CONTROL PAGE - 2

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
such regulations which in any manner affect the conduct of the work, and shall at all times
observe and comply with all such regulations. In the event of conflict between such
regulations and the requirements of the specifications, the more restrictive requirements
shall apply.
B. The Contractor shall exercise every reasonable precaution throughout the life of the
project to prevent the eroding of soil and the silting of rivers, streams, lakes, reservoirs,
other water impoundments, ground surfaces, or other property. All disturbed areas not to
be paved and left exposed will, within 30 working days of completion of any phase of
grading, be planted or otherwise provided with either temporary or permanent ground
cover, devices, or structures sufficient to restrain erosion.
C. Prior to suspension of operations on the project or any portion thereof, the Contractor
shall take all necessary measures to protect the construction areas, including but not
limited to borrow sources, soil type base course sources, and waste areas, from erosion
during the period of suspension.
D. Provide diversion ditches and berms as necessary to prevent concentrated flow of water
across disturbed areas.
E. Stockpile excavated material on the opposite side of the utility trenches from the
watercourses to the extent that is possible.
F. In the event that stockpiles are placed on the watercourse side of the trench, provide silt
fence or silt berms with stone filter outlets along the entire length of the stockpile that is
on the watercourse side of the trench. Upon the completion of backfilling, the measures
shall be removed and the site graded to its natural grade or as shown on plans.
G. Maintain natural buffer zones along all watercourses sufficient to retain all visible siltation
within the first 25 percent of the buffer width.
H. Provide a settling basin with a gravel filter outlet for all water pumped from trenches or
de -watering equipment. Pumping of that water directly into any stream, pond, or
watercourse is prohibited.
Tamp, fertilize, seed and mulch the disturbed areas as soon as practicable after line is
installed and, in all cases, no later than 30 days after completion of the line segment or
work at a particular site.
When construction operations are suspended for more than 30 days, provide temporary
seeding and mulching of all disturbed areas including those areas in which further
construction is necessary.
SECTION 3125 00 EROSION & SEDIMENTATION CONTROL PAGE - 3

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
K. Erosion control measures installed by the Contractor shall be acceptably maintained by the
Contractor.
3.02 SEEDING
A. See Drawings for seeding mixture.
B. Seeding for erosion control shall be performed in accordance with the recommended
outlined in the Practice Standards and Specifications.
C. Soil Amendments: Apply lime and fertilizer according to soil test, or apply 3,000 - 5,000
lb/acre ground agricultural limestone and 1,000 lb/acre 10-10-10 fertilizer.
D. Mulch: Apply 4,000 lb/acre grain straw or equivalent cover of another suitable mulch.
Anchor straw by tacking with asphalt, netting, or roving or by crimping with a mulch
anchoring tool. A disk with blades set nearly straight can be used as a mulch anchoring
tool. Anchor netting and erosion control fabric at the edge of pavement with a 2 foot wide
ribbon of ABC Stone ("crusher run").
E. All seeded areas will be fertilized, re seeded as necessary, and mulched according to these
specifications to maintain a vigorous, dense vegetative cover.
3.03 WATER AND AIR POLLUTION
A. The Contractor shall exercise every reasonable precaution throughout the life of the
project to prevent pollution of rivers, streams, and water impoundments. Pollutants such
as chemicals, fuels, lubricants, bitumens, raw sewage, and other harmful waste shall not
be discharged into or alongside of rivers, streams, or EROSION & SEDIMENTATION
CONTROL 02190-4 impoundments, or into natural or man made channels leading thereto.
B. The Contractor shall comply with all State or local air pollution regulations throughout the
life of the project.
3.04 DUST CONTROL
A. The Contractor shall control dust throughout the life of the project within the project area
and at all other areas affected by the construction of the project, including, but not
specifically limited to, unpaved secondary roads, haul roads, access roads, disposal sites,
borrow and material sources, and production sites. Dust control shall not be considered
effective condition, public nuisance, or condition endangering the value, utility, or
appearance of any property.
SECTION 3125 00 EROSION & SEDIMENTATION CONTROL PAGE - 4

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
3.05 NOISE CONTROL
A. The Contractor shall exercise every reasonable precaution throughout the life of the
project to prevent excessive and unnecessary noise. The Contractor shall choose his
methods so as to minimize the disturbance of area residents.
3.06 SILT FENCE
A. Silt fence shall be installed in locations shown on Drawings and in accordance with details
shown on Drawings.
END OF SECTION 3125 00
SECTION 3125 00 EROSION & SEDIMENTATION CONTROL PAGE - 5

Division 33

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
SECTION 33 05 24 — HORIZONTAL DIRECTIONAL DRILLING
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 1 Specifications, apply to this Section.
1.2 SUMMARY
A. Section Includes:
1. Excavation for approach trenches and pits.
2. Horizontal directional drilling.
3. Pipe.
1.3 MEASUREMENT AND PAYMENT
A. Horizontal Directional Drilling:
1. Basis of Measurement: Lump Sum.
1.4 REFERENCES
A. American Association of State Highway and Transportation Officials:
1. AASHTO T180 - Standard Specification for Moisture -Density Relations of Soils Using a
4.54-kg (10-Ib) Rammer and a 457-mm (18-in.) Drop.
B. ASTM International:
1. ASTM D698 - Standard Test Method for Laboratory Compaction Characteristics of Soil
Using Standard Effort (12,400 ft-Ibf/ft3).
2. ASTM D1557 - Standard Test Method for Laboratory Compaction Characteristics of
Soil Using Modified Effort (6,000 ft-Ibf/ft3).
3. ASTM D2922 - Standard Test Method for Density of Soil and Soil -Aggregate in Place by
Nuclear Methods (Shallow Depth).
4. ASTM D3017 - Standard Test Method for Water Content of Soil and Rock in Place by
Nuclear Methods (Shallow Depth).
5. ASTM F1962 - Standard Guide for Use of Maxi -Horizontal Directional Drilling for
Placement of Polyethylene Pipe or Conduit Under Obstacles, Including River Crossings.
C. National Utility Contractors Association:
1. NUCA- HDD Installation Guidelines.
SECTION 33 05 24 HORIZONTAL DIRECTIONAL DRILLING PAGE - 1

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
D. The Plastic Pipe Institute, Inc.:
1. PPI Generic Butt Fusion Joining Procedure TR-33.
1.5 DESIGN REQUIREMENTS
A. Design Criteria:
1. Drilling Steering System: Remote with continuous electronic monitoring of boring
depth and location.
2. Directional Change Capability: 90 degree with 35 foot radius curve.
3. Minimum distance for single bores and between boring pits:
Pipe Size Boring Distance
1 to 1-1/2 inches 400 feet
2 to 2-1/2 inches 350 feet
3 to 6 inches 300 feet
4. Ratio of Reaming Diameter to Pipe Outside Diameter:
a. Nominal pipe diameter of 6 inches and smaller: 1.5 maximum.
b. Nominal pipe diameter larger than 6 inches: Submit recommended ratio and
reaming procedures for review.
1.6 SUBMITTALS
A. Shop Drawings:
1. Submit technical data for equipment, method of installation, and proposed sequence
of construction.
2. Include information pertaining to pits, dewatering, method of spoils removal,
equipment size and capacity, equipment capabilities including installing pipe on radius,
type of drill bit, drilling fluid, method of monitoring line and grade and detection of
surface movement, name plate data for drilling equipment and mobile spoils removal
unit.
B. Product Data:
1. Identify source of water used for drilling.
2. Submit copy of approvals and permits for use of water source.
C. Project Record Documents: Record actual locations of pipe and invert elevations.
SECTION 33 05 24 HORIZONTAL DIRECTIONAL DRILLING PAGE - 2

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
D. Identify and describe unexpected variations to subsoil conditions or discovery of uncharted
utilities.
E. Record actual depth of pipe at 25-foot intervals.
F. Record actual horizontal location of installed pipe.
G. Show depth and location of abandoned bores.
H. Record depth and location of drill bits and drill stems not removed from bore.
1.7 QUALITY ASSURANCE
A. Perform work in accordance with the following:
1. NUCA HDD Installation Guidelines.
2. ASTM F1962.
1.8 DELIVERY, STORAGE, AND HANDLING
A. Provide temporary end caps and closures on piping and fittings until pipe is installed.
B. Protect pipe from entry of foreign materials and water by temporary covers, completing
sections of work, and isolating parts of completed system.
C. Accept products on site in manufacturer's original containers or configuration. Inspect for
damage.
D. Use shipping braces between layers of stacked pipe. Stack piping lengths no more than 3
layers high.
E. Support pipes with nylon slings during handling.
PART 2 PRODUCTS
2.1 DRILLING FLUID
A. Drilling Fluid: Liquid bentonite clay slurry; totally inert with no environmental risk.
2.2 PIPE
A. Water Distribution System Pipe: HDPE SDR-9.
B. Sanitary Sewage System Pipe: HDPE SDR-9.
SECTION 33 05 24 HORIZONTAL DIRECTIONAL DRILLING PAGE - 3

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
C. Electrical and Communication Conduit Pipe: HDPE SDR 11.
2.3 FILL MATERIALS
A. On -site suitable material.
2.4 WATER SOURCE
A. Water: Potable.
2.5 ACCESSORIES
A. HDPE mechanical joint adapter meeting the requirements of AWWA C111/ANSI A21.11.
B. Mechanical joint accessory kits
C. Grout: 1 part Portland cement, 3 parts mortar sand, and water.
PART 3 EXECUTION
3.1 PREPARATION
A. Notification: The Engineer should be notified at least forty-eight (48) hours prior to beginning
the work of this Section.
B. Call NC One Call service at 811 not less than three working days before performing Work.
1. Request underground utilities to be located and marked within and surrounding
construction areas.
C. Locate, identify, and protect from damage any utilities indicated to remain.
D. Identify required lines, levels, contours, and datum locations.
E. Protect plant life, lawns, and other features remaining as portion of final landscaping.
F. Protect benchmarks, survey control points, existing structures, fences, sidewalks, paving, and
curbs from excavating equipment and vehicular traffic.
3.2 DEWATERING
A. Intercept and divert surface drainage, precipitation, and groundwater away from excavation
through use of dikes, curb walls, ditches, pipes, sumps or other means.
SECTION 33 05 24 HORIZONTAL DIRECTIONAL DRILLING PAGE - 4

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
B. Develop and maintain substantially dry subgrade during drilling and pipe installation.
3.3 EXCAVATION
A. Excavate subsoil as specified in Section 3123 17 Trenching and Backfilling.
B. Excavate approach trenches and pits as site conditions require. Minimize number of access
pits.
C. Provide sump areas to contain drilling fluids.
D. Restore areas after completion of drilling and carrier pipe installation.
3.4 DRILLING
A. Drill pilot bore with vertical and horizontal alignment as indicated on drawings and details.
B. Guide drill remotely from ground surface to maintain alignment by monitoring signals
transmitted from drill bit.
1. Monitor depth, pitch, and position.
2. Adjust drill head orientation to maintain correct alignment.
C. Inject drilling fluid into bore to stabilize hole, remove cuttings, and lubricate drill bit and pipe.
D. Continuously monitor drilling fluid pumping rate, pressure, viscosity, and density while drilling
pilot bore, back reaming, and installing pipe to ensure adequate removal of soil cuttings and
stabilization of bore.
1. Provide relief holes when required to relieve excess pressure.
2. Minimize heaving during pullback.
E. Calibrate and verify electronic monitor accuracy during first 50 feet of bore in presence of
Engineer before proceeding with other drilling. Excavate minimum of four test pits spaced along
first 50 feet bore to verify required accuracy. When required accuracy is not met, adjust
equipment or provide new equipment capable of meeting required accuracy.
F. After completing pilot bore, remove drill bit.
3.5 DRILLING OBSTRUCTIONS
A. When obstructions are encountered during drilling, notify Engineer immediately. Do not
proceed around obstruction without Engineer's approval.
SECTION 33 05 24 HORIZONTAL DIRECTIONAL DRILLING PAGE - 5

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
B. For conditions requiring more than 3 feet deviation in horizontal alignment, submit new shop
drawings to Engineer for approval before resuming work.
C. Maintain adjusted bore alignment within easement or right-of-way.
3.6 PIPE INSTALLATION
A. After completing pilot bore, remove drill bit. Install reamer and pipe pulling head. Select
reamer with minimum bore diameter required for pipe installation.
B. Attach pipe to pipe pulling head. Pull reamer and pipe to entry pit along pilot bore.
C. Inject drilling fluid through reamer to stabilize bore and lubricate pipe.
D. Install piping with horizontal and vertical alignment as shown on drawings and details.
E. Protect and support pipe being pulled into bore so pipe moves freely and is not damaged
during installation.
F. Do not exceed pipe manufacturer's recommended pullback forces.
G. Install trace wire continuous with each bore. Splice trace wire only at intermediate bore pits.
Tape or insulate trace wire to prevent corrosion and maintain integrity of pipe detection.
1. Terminate trace wire for each pipe run at structures along pipe system.
2. Provide extra length of trace wire at each structure, so trace wire can be pulled 3 feet
out top of structure for connection to detection equipment.
3. Test trace wire for continuity for each bore before acceptance.
H. Provide sufficient length of pipe to extend past termination point to allow connection to
other pipe sections.
I. Slip the gland ring over the pipe end and then butt fuse the HDPE MJ adapter to the end of the
pipe using the PPI generic Butt Fusion Joining Procedure TR-33.
J. Mark location and depth of bore with spray paint on paved surfaces, and wooden stakes on
non -paved surfaces at 25-foot intervals.
3.7 SLURRY REMOVAL AND DISPOSAL
A. Contain excess drilling fluids at entry and exit points until recycled or removed from site.
Provide recovery system to remove drilling spoils from access pits.
B. Remove, transport and legally dispose of drilling spoils.
1. Do not discharge drilling spoils in sanitary sewers, storm sewers, or other drainage
systems.
SECTION 33 05 24 HORIZONTAL DIRECTIONAL DRILLING PAGE - 6

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
2. When drilling in suspected contaminated soil, test drilling fluid for contamination before
disposal.
C. When drilling fluid leaks to surface, immediately contain leak and barricade area from
vehicular and pedestrian travel before resuming drilling operations.
D. Complete cleanup of drilling fluid at end of each work day.
3.8 ERECTION TOLERANCES
A. Maximum Variation From Horizontal Position: 12 inches.
B. Maximum Variation From Vertical Elevation: 2 inches.
C. Minimum Horizontal and Vertical Clearance From Other Utilities: 12 inches.
D. When pipe installation deviates beyond specified tolerances, abandon bore, remove installed
pipe, re -bore, and reinstall pipe in correct alignment.
E. Fill abandoned bores greater than 3" in diameter with grout or flowable fill material.
3.9 FIELD QUALITY CONTROL
A. Upon completion of pipe installation, test pipe in accordance with the following:
1. Sanitary Sewer Pipe Testing: Section 33 0132 Sewer and Manhole Testing.
2. Water Distribution Pipe Testing: Section 33 1100 Water Distribution.
3.10 CLEANING
A. Upon completion of drilling and pipe installation, remove drilling spoils, debris, and
unacceptable material from approach trenches and pits. Clean up excess slurry from ground.
B. Restore approach trenches and pits to original condition.
END OF SECTION
SECTION 33 05 24 HORIZONTAL DIRECTIONAL DRILLING PAGE - 7

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
SECTION 33 3400 -SANITARY UTILITY SEWERAGE FORCE MAINS
PART 1: GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of Contract, including Technical Data, Operation &
Maintenance Requirements and Supporting Data apply to this Section.
1.2 SUMMARY
A. This Section includes wastewater effluent force main piping and appurtenances from the
wastewater collection, delivery and treatment system.
B. Related Sections: The following Sections contain requirements that relate to this Section.
1. Section 3100 00 - Earthwork
1.3 QUALITY ASSURANCE
A. Comply with applicable portions of NCDE&NR, Division of Water Quality permits.
1.4 PROJECT CONDITIONS
A. Site Information: Perform site survey and verify existing utility locations. Contractor to
physically locate existing forcemain and protect during construction.
PART 2 - PRODUCTS
2.1 WASTEWATER FORCE MAINS
A. PVC (Polyvinyl Chloride) plastic pipe
- Pipe: ASTM D1785 Schedule 40
-Fittings: ASTM D2466 Schedule 40
- Joints: ASTM D2564 Solvent cement type
B. PVC plastic ball valves, unions and check valves
- Valves to be PVC valves
Shall be designed for a working pressure of 150 psi.
SECTION 33 34 00 SANITARY UTILITY SEWERAGE FORCEMAINS PAGE - 1

P1501
2.2 FORCE MAIN IDENTIFICATION
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
A. Underground -Type Metallic Line Markers: Manufacturer's standard permanent, bright -
colored, continuous -printed metallic tape, intended for direct -burial service; not less than
four inch (4") wide by four (4) mils thick. Provide brown tape with black printing reading
"CAUTION BURIED FORCE MAIN BELOW". Acceptable manufacturers: Allen Systems, Inc.,
CALPICO, Inc., AND EMED Co., Inc.
B. The metallic tape must be installed within the backfill with a minimum burial depth of 6"
below finished grade.
PART 3 - EXECUTION
3.1 DEPTH OF PIPE:
A. 36-inch minimum cover, ground surface to top of pipe.
3.2 STRINGING, CLEANING:
A. Pipe and fittings shall be strung out along the route of construction with the bells facing in
the direction in which the Work is to proceed. Pipe shall be placed where it will cause
the least interference with traffic. Pipe shall be handled by mechanical equipment.
Before the pipe is lowered into the trench, it will be swabbed or brushed out, if required,
to insure that no dirt or foreign material remains in the finished line. Trench water shall
be kept out of pipes and the pipe kept closed by means of a test plug whenever Work is
not in progress. The Contractor shall provide the means for dewatering the trench and
the cost thereof shall be included in the price for installing the pipe.
3.3 PREPARATION OF TRENCH & BEDDING:
A. Pipe shall be laid in a level trench. Irregularities shall be smoothed out or filled in with
sand and tamped as required. Holes shall be scooped out where the joints occur leaving
the entire barrel of the pipe bearing on the pipe bed.
3.4 DEFLECTIONS:
A. Deflections from a straight line or grade made necessary by vertical curves or horizontal
curves or offsets shall not exceed the manufacturer's recommendations. If the specified
or required alignment requires deflections in excess of those recommended, the
Contractor shall either provide special bends as approved by the Owner or his Engineer or
a sufficient number of shorter lengths of pipe to provide angular deflections within the
required limit.
SECTION 33 34 00 SANITARY UTILITY SEWERAGE FORCEMAINS PAGE - 2

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
3.5 JOINTING:
A. Jointing shall be carried out following the recommendations of the manufacturer of the
pipe. All joints shall be watertight and any leaks or defects discovered shall be
immediately repaired to the satisfaction of the Engineer. Any pipe which has been
disturbed after being laid shall be taken up, the joints cleaned and the pipe properly re-
laid. Any superfluous material inside the pipe shall be flushed or removed by means of
an approved follower or scraper after joints are made. Installation of fittings and pipe
joints shall be in strict accordance with the manufacturer's recommendations.
3.6 THRUST BLOCKS:
A. Thrust blocks shall be installed at all fittings within the system which change direction of
flow or create unbalanced forces about the fitting. When directed, thrust blocks shall
also be installed on each side of pipe where bends are made by deflecting pipe or joints
and soil conditions do not provide adequate support for the pipe.
B. Thrust blocks shall be constructed of concrete which develops a 28-day strength of 2,500
psi and shall have a bearing area or volume as indicated on the Drawings. Concrete shall
be kept behind the bells of fittings so as not to interfere with the joint or bolts and shall
not run against gasket or pipe.
C. Thrust blocks shall be constructed so as to bear against undisturbed soil unless special
provisions are made which are approved prior to construction. If the soil encountered
has insufficient bearing capacity to resist thrusts special provisions shall be made as
required by the Engineer. Special provisions may include removal of poor soil and
replacement with suitable material; installation of tie rods and collars; or installation of pile
and thrust block.
3.7BEDDING, INITIAL & INTERMEDIATE BACKFILL:
A. Regardless of the bedding type specified, the pipe barrel shall be supported uniformly
throughout its length. Bell or coupling holes shall be provided such that no pipe loads
are supported by bells or couplings.
B. Unless shown otherwise on the Drawings, bedding and initial backfill shall be type one
when subgrade is stable (as examined by the Engineer) and trench width at the top of the
pipe does not exceed that specified.
C. Material for initial and intermediate backfill (as defined on the Drawings and below) shall
be selected borrow material, granular material as defined under Section 02200 -Earthwork
or selected trench material free of organics, refuse, stones larger than one inch and
SECTION 33 34 00 SANITARY UTILITY SEWERAGE FORCEMAINS PAGE - 3

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
frozen material.
D. Initial backfill is that which is placed from the pipe bedding material up to the centerline of
the pipe. Initial backfill shall be hand -placed and carefully tamped under pipe haunches.
E. Intermediate backfill is that which is placed from the initial backfill to one foot above the
top of the pipe. Intermediate backfill shall be placed and tamped. Material shall be
placed and tamped in layers not exceeding six inches thick when compaction required
exceeds 80% of maximum dry density.
F. Minimum Compaction:
Class 2 - unimproved areas
Class 1- roadways, road shoulders, driveways, walkways and slopes greater than
20
of Maximum Dry Density
Pipe Backfill Zone Class 2 Class 1
PVC SCH 40 Initial Intermediate 80% 90%
3.8 FIELD QUALITY CONTROL, TESTING & INSPECTION
A. Hydrostatic Testing:
1. The Contractor shall be required to perform leakage tests on newly constructed
mains as outlined herein. The Contractor will furnish the gauge for making the
tests and Engineer shall approve the measuring device. The Contractor shall
furnish the pump, pipe, connections and all other necessary apparatus, and shall
furnish the necessary assistance to conduct the tests.
2. Leakage tests shall be performed on all sections of line. Testing shall be
conducted as the Work progresses unless otherwise directed.
3. All testing for record shall be performed in the presence of the Engineer or
representative.
4. Where any section of a main is provided with concrete thrust blocking or
encasement, hydrostatic testing shall not be performed until at least five days have
elapsed after the concrete was installed. If high -early strength cement is used in
the concrete for thrust blocks and encasement, the hydrostatic tests shall not be
performed until at least one day has elapsed, unless otherwise directed by the
Engineer.
SECTION 33 34 00 SANITARY UTILITY SEWERAGE FORCEMAINS PAGE - 4

P1501
Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
B. Test Procedures:
1. After completion of preparation and after test connections are made in a manner
satisfactory to the Engineer each section of pipe shall be slowly filled with water
and pressurized. All pressures shall be based on the elevation of the lowest point
in the test section and corrected to the elevation of the test gauge.
All air shall be expelled from the pipe. If permanent air vents are not located at
all high points, the Contractor shall install corporation cocks at such points so the
air can be expelled as the line is filled with water. After all air has been expelled,
the corporation cocks shall be closed and testing begun.
After all air has been expelled from a test section, all connections made and other
preparations completed, the test section shall be subjected to leakage test
pressure. This test pressure shall be sustained by a pump, and the quantity of
water delivered to the system by the pump for a specified duration of time shall
be measured. At the end of the designated time period, the quantity of water
delivered to the test section shall be equal to or less than the allowable leakage
computed for the test section.
4. If any test of the pipe discloses leakage greater than that specified, the Contractor,
at his own expense, shall locate and repair defective joints and/or material until
the leakage is within the specified allowance.
The Engineer shall be furnished a written report of the results of the leakage test
that identifies the specific length of pipe tested, the pressure, the duration of the
test, the amount of actual leakage and the leakage allowance. The report shall
be signed by the Contractor and the Engineer.
D. Hydrostatic Test Pressure, Duration and Allowance:
1. The design working pressure (p) shall be calculated for the lowest point in a test
section (see Standard Detail Sheet).
a) Test pressure shall not exceed the pressure class of the pipe.
b) Test pressure shall not cause the working pressure of any valve or other
appurtenance to be exceeded.
c) Maximum test pressure shall be 60 psi.
d) Minimum test pressure shall be 50 psi.
2. The test pressure shall be corrected to the elevation of the test gauge.
SECTION 33 34 00 SANITARY UTILITY SEWERAGE FORCEMAINS PAGE - 5

P1501 Riversound Wastewater Treatment Plant
3,350 GPD Interim Treatment Plant Project
County of Chowan, North Carolina
3. Duration of the leakage test shall be two hours for sewage force mains.
4. The leakage allowance shall be the following gallons per day per mile of pipe per
inch or nominal diameter at test pressure computed above.
Material Allowance
PVC 10
5. The allowable leakage for a test section - L in gallons per hour - shall be calculated
as follows:
Lgph = Length (ft.) x Dia. (in.) x 10
5280
E. Water for Testing and Disinfection:
1. Water for the Work outlined in this Section of the Specifications shall be provided
by the Contractor.
END OF SECTION 33 34 00
SECTION 33 34 00 SANITARY UTILITY SEWERAGE FORCEMAINS PAGE - 6

Division 46

46 53 00 Biological Treatment Equipment
Wastewater Process Equipment

AdvanTex"
AX-MAX General Specifications
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 1
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 2
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

ADVANTEX° 1
AX-MAX GENERAL SPECIFICATIONS 1
PART 1 - GENERAL 5
1.01
DEFINITIONS 5
1.02
GENERAL DESCRIPTION 5
1.03
SUBMITTALS 5
1.04
OR -EQUAL EVALUATIONS 5
1.05
EXPERIENCE CLAUSE 7
1.06
MANUFACTURER 7
1.07
WARRANTY 8
1.08
SERVICEABILITY 8
1.09
PUMPS 8
PART 2 - PRODUCTS 8
2.01 PUMPS / OPERAI'1NG CONDITIONS
8
Pre -Anoxic Return (Rnox) Pump
8
PF500712
9
PF501012
9
PF751012
9
PF1452012
9
2.02 T MAX PUMP BASIN
9
2.03 AX-MAX ADVANTEX° TREATMENT SYSTEM
9
2.04 MOVING BED BIOREACTOR DENITRIFYING (MBBRd)
10
2.05 AX MAX VENTILATION SYSTEM
10
Individual Unit Fans
10
Forced Air Ventilation
10
Ventilation Line Insulation
10
2.06 SPLICE BOX CONDUIT SEALS AND SEALANTS
10
2.07 CONTROLS
11
2.08 CONTROL BUILDING
13
2.09 CHEMICAL FEEDER
13
2.10 INSTALLATION
13
2.11 LOCATION
13
PART 3 - EXECUTION
13
3.01 PRECONSTRUCTION CONFERENCE
13
3.02 INSTALLATION AND MELD TESTING TRAINING
14
3.03 QUALITY CONTROL
14
3.04 SYSTEM COMMISSIONING
14
PART 4 - OPERATION AND MAINTENANCE
15
4.01 OPERATION AND MAINTENANCE MANUALS
15
4.02 SPARE PARTS
15
4.03 OPERATION AND MAINTENANCE TOOLS
15
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc.
3
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 4
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

SECTION 46 53 XX
AX-MAX EQUIPMENT SPECIFICATIONS
PART 1 - GENERAL
1.01 DEFINITIONS
A. Wherever used in these specifications and printed with initial bold capital letters, the terms
listed below will have the meanings indicated which are applicable to both the singular and
plural thereof.
1. Bid The offer or proposal of a Bidder submitted on the prescribed form setting forth the
prices for the work to be performed.
2. Bidder — The individual or entity who submits a Bid directly to the Owner.
3. Contractor — The individual or entity with whom Owner has entered into the agreement.
4. Engineer The individual or entity named as such in the agreement.
5. Inspector - The specific individual designated by the Owner, Engineer, Contractor, and
Manufacture to ensure quality control by inspecting and certifying that the installation of
the AX-MAX treatment system is in compliance with the Manufactures
recommendations and requirements.
6. Manufacture — A supplier, fabricator, distributor, material man, or vendor having a direct
contract with Contractor or Owner to furnish materials or equipment to be incorporated in
the work by contractor.
7. Owner — The individual or entity with whom Contractor has entered into the agreement
and for whom the work is to be performed.
8. Operator — The individual or entity with whom the owner has entered into an agreement
and for whom operation and maintenance shall be performed.
1.02 GENERAL DESCRIPTION
The MANUFACTURER shall furnish a complete advanced treatment package(s), consisting of a
pump, discharge assembly, ball valve, check valve, splice box, treatment system, and controls.
1.03 SUBMITTALS
The MANUFACTURER shall furnish six (6) sets of shop drawings and technical data sheets.
The submittals shall clearly specify the materials of construction, equipment compatibility, along
with drawings for each unique package being supplied.
1.04 OR -EQUAL EVALUATIONS
A. Throughout the equipment specifications you will find the term "or approved equal." For this
project, this term "approved equal' shall mean equal in the judgment of the ENGINEER.
Should the CONTRACTOR seek approval of a product other than the brand or brands
named in the specifications, it shall furnish written evidence that such product conforms in all
respects to the specified requirements, and that it has been used successfully elsewhere under
similar conditions. It will not be the responsibility of the MANUFACTURE specified within
these specifications to provide research, documentation, or data supporting the difference
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 5
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

between the "or equal" and the specified product. This will be the sole responsibility of the
CONTRACTOR seeking the approval.
B. Where the specified requirements involve conformance to recognized codes or standards, the
BIDDER shall furnish evidence of such conformance in the form of test or inspection
reports, prepared by a recognized agency, and bearing an authorized signature.
Manufacturer's standard data and catalog cut sheets will not be considered sufficient in
themselves, and the engineer will not be responsible for seeking further data from the
manufacturer, or for researching the product. Failure to provide complete data will be cause
for rejection of the product. The submission shall include any impacts that could be expected
from the alternative product and shall also indicate any product that would require a license
or royalty, the actual fees, and a note that these fees would be handled by the BIDDER. The
BIDDER shall provide submissions; meeting the above parameters no less than TWO
WEEKS prior to BID opening for review by the ENGINEER for CONTRACTORS seeking
approval of "or equal" products or systems shall provide, at minimum, the following.
C. Product/System submittals, including, but not limited to;
1. The number of years the MANUFACTURER has been in business of manufacturing
relevant products/systems
a. Size of company, including
1) Number of employees related to relevant products/systems
2) Number of engineers on staff related to relevant products/systems
b. Product specifications and a detailed description of how each product or component
is "equal" to the specified product, system, or component. A side -by -side comparison
is required.
1) Equipment/system warranty along with exclusions
2) Performance claims, including, but not limited to;
a) Treatment design
• Surface area
• Maintenance frequency
b) Pump motor description
• Manufacturer and origin
• Length of service
• Number of units in operation
• Life -cycle cost (repair and replacement frequency)
• Warranty
c) Pump liquid end description
• Manufacturer and origin
• Length of service
• Number of units in operation
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 6
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

• Life -cycle cost (repair and replacement frequency and cost). Note liquid
ends must be remove -able and repairable and cleanable.
• Warranty
d) Corrosion resistance
e) Pump Lead description
• Lead must be SOOW, extra heavy duty cord (600V) CSA approved.
f) Control panel components
• Manufacturer and origin
• Length of service
• Number of units in operation
• Warranty
• Enclosure description
c. Evidence of successfully obtaining approval for a system with similar permit
requirements with the regulating authority
d. Summary of product/system track record and history, including, but not limited to;
1) Number of similarly sized systems
2) Detailed summary of, at minimum, ten (10) similarly sized systems, at least five
(5) years old, including, but not limited to;
a) Project name, location, and application
b) Years in operation
c) Current average daily flows and design flows
d) Operator name and contact information
2. BIDDER shall specify and furnish documentation related to manufacturer (or
representative) support services, including, but not limited to;
a. Installation training program and support material
b. Installation oversight program and support material
c. Operator training program and support material
d. Startup services program and support material
1.05 EXPERIENCE CLAUSE
The equipment furnished shall be manufactured and supplied by a company experienced in the
design and manufacture of advanced treatment systems. MANUFACTURERS shall have a
minimum ten (10) years experience in the design and manufacturer of advanced treatment
systems of similar size and equipment specified. MANUFACTURERS shall have at minimum of
twenty-five (25) successful installations of advanced treatment systems.
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 7
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

1.06 MANUFACTURER
The MANUFACTURER shall be Orenco Systems*', Inc. or approved equal. The
MANUFACTURER shall furnish a complete factory built advanced treatment system. The
MANUFACTURER shall supply detailed installation and O&M instructions. and evidence of an
adequate service provider network shall be submitted to the ENGINEER. The
MANUFACTURER shall also submit evidence that the local supplier has spare parts, equipment
repair ability, and experienced service personnel. The MANUFACTURER shall also provide the
following support personnel:
• Professional engineer or personnel under the direct supervision of a professional engineer
dedicated to supporting the project through design, construction, and O&M.
• Asset Management Department dedicated to assisting operators with operational and
maintenance activities.
1.07 WARRANTY
The advanced treatment system MANUFACTURER shall provide a three (3) year warranty for
the entire treatment system, including, but not limited to the pump, pump vault, hose and valve
assembly, control panel, and splice box. Warranty term shall ensue after OWNER'S acceptance
and system startup procedures are complete. The MANUFACTURER shall submit detailed
exclusions from the warranty or additional cost items required to maintain the equipment in
warrantable condition. The warranty shall be documented in product literature.
1.08 SERVICABILITY
The advanced treatment system components shall be completely serviceable, with easy access to
the pump(s), effluent screen, treatment system, and floats. The pump shall be designed for
removal without removing the effluent screen and floats.
1.09 PUMPS
The pump must be approved for use in the treatment unit as described in these specifications.
Pump shall be 3/4 to 2.0 hp, 230 VAC, single phase, 60 Hz, two -wire motor, with 30 foot long
extra heavy duty (SOOW) electrical cord with ground. The pumps must be submersible
High -Head Effluent pumps. Pumps shall be UL and CSA listed for use with effluent. The pumps
must have a minimum 24-hour run dry capability without water lubrication. The pumps shall
have a 1/8-inch bypass orifice to ensure flow circulation for motor cooling and to prevent air
bind. The pump shall have a floating impeller design to protect against upthrust and increase
pump life. The pump's liquid ends must be repairable (by replacing impellers and/or diffusers)
for better long-term cost of ownership. The motor must be rated for continuous use and frequent
cycling, at least 100 cycles per day. The motor cable must be suitable for Class 1, Division 1 and
2 applications. The pumps shall be lightweight for easy removal and maintenance. The pump
intake screen must be 1/8-inch mesh polypropylene. The pump shall have internal thermal
overload protection and internal lightning protection. All pumps shall undergo 3-point (Dead
head, Design Flow, and Design Flow + 30%) wet testing at the factory to confirm performance.
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 8
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

PART 2 - PRODUCTS
2.01 PUMPS / OPERATING CONDITIONS
Flow Equalization Tank (EQ) Pumps
Pumps shall comply with general requirements set forth in Section 1.09. Orenco Systems,
Inc., Model PF3005 series or engineer -approved equal 1/2Hp, 230 VAC, single phase, 60 Hz,
two -wire motor, with 10 - 30 foot long extra heavy duty (SO) electrical cord with ground.
Pump shall be UL and CSA listed as an effluent pump.
AX-MAX Recirculation Pumps
Pumps shall comply with general requirements set forth in Section 1.09. Orenco Systems,
Inc., Model PF7510 series or engineer -approved equal 1Hp, 230 VAC, single phase, 60 Hz,
two -wire motor, with 10 - 30 foot long extra heavy duty (SO) electrical cord with ground.
Pump shall be UL and CSA listed as an effluent pump.
AX-MAX Discharge Pumps
Pumps shall comply with general requirements set forth in Section 1.09. Orenco Systems,
Inc., Model PF7510 series or engineer -approved equal 1Hp, 230 VAC, single phase, 60 Hz,
two -wire motor, with 10 - 30 foot long extra heavy duty (SO) electrical cord with ground.
Pump shall be UL and CSA listed as an effluent pump.
Pre -Anoxic Return (Rnox) Pump
Pump shall comply with general requirements set forth in Section 1.09. Orenco Systems,
Inc., Model PF2005 series or engineer -approved equal 1/2Hp, 230 VAC, single phase, 60 Hz,
two -wire motor, with 10 - 30 foot long extra heavy duty (SO) electrical cord with ground.
Pump shall be UL and CSA listed as an effluent pump.
2.02 AX-MAX ADVANTEX® TREATMENT SYSTEM
A. The treatment system shall be an Orenco Systems', Inc. AdvanTex° AX-MAX facility. The
facility shall be a complete, fully plumbed wastewater treatment system for receiving and
processing septic tank effluent. The facility shall include the following units:
1. Stage 1 (4 Units)
a. AX-MAX275-42 - Unit shall have an overall length of 42 ft, a width of 7.5 ft, and a
height of 8ft. The structure shall be constructed of fiberglass -reinforced plastic with a
thickness of 4 inches. The unit shall include a piping network that recirculates water
from the recirculation tank atop the hanging textile media. The media shall be
hanging textile media with a specific area of over 275 square feet.
2. Stage 2 (2 Units)
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 9
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

a. AX-MAX275-42 - Unit shall have an overall length of 42 ft, a width of 7.5 ft, and a
height of 8ft. The structure shall be constructed of fiberglass -reinforced plastic with a
thickness of 4 inches. The unit shall include a piping network that recirculates water
from the recirculation tank atop the hanging textile media. The media shall be
hanging textile media with a specific area of over 275 square feet.
2.04 MOVING BED BIOREACTOR DENITRIFYING (MBBRd)
Denitrifying bioreactor shall be an Orenco Systems', Inc. MBBRD. The facility shall be a
complete, fully plumbed wastewater treatment system for enhanced denitrification. The structure
shall be constructed of fiberglass -reinforced plastic with a thickness of 4 inches. Each unit shall
include a submersible heavy duty, direct drive mixer to recirculate water for blending nitrified
filtrate with a carbon supplement and suspended media. Unit shall have a dimension of 20' long
by 7.5' wide.
2.05 AX MAX VENTILATION SYSTEM
Individual Unit Fans
An Orenco Systems°, Inc. ventilation system shall be provided in the AX-MAX Series Treatment
Facility or approved equal. The fan shall be UL recognized, 0.8 Hp, 115/230VAC, 1.4A/0.7A,
3400 RPM, and provide up to 245 CFM at 0" H2O.
Forced Air Ventilation
Ventilation fan shall be Cincinnati Fan Model LMF-6 or engineer -approved equal mounted in the
control building. Housing shall be constructed of commercial grade 319-cast aluminum for
increased strength and AMCA Type C spark -resistance. Fan shall be rated for continuous duty
with an RPM of 3450 and capable of delivering a minimum of 100 CFM per AX-Max unit.
2.06 SPLICE BOX CONDUIT SEALS AND SEALANTS
As part of the treatment package, all AX-Max units will include re -installed splice boxes and UL
listed waterproof butt splice connectors. The use of a UL-approved conduit seal kit accessible
above ground shall be required to prevent the passage of gasses, vapors, or flames through the
conduit to the control panel. An additional UL classified sealant shall be added to the splice box
coupling to prevent condensation accumulation in the splice box. The following UL approved
sealants shall be used:
a. UL classified moisture -cure polyurethane quick drying foam or ENGINEER -approved
equal with an R-5 rating for each inch of foam.
b. UL classified silicone sealant or ENGINEER -approved equal consisting of a neutral cure
silicone, non -acetic, non -corrosive silicone able to withstand temperatures to 450' F.
2.07 CONTROLS
A. Controls and alarms shall be listed per UL 508. Panels shall be repairable in the field without
the use of soldering irons or substantial disassembly.
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 10
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

B. A dedicated phone line, Ethernet cable, or cellular router shall be installed. Panel is required
to allow real-time connectivity with the telemetry control panel and alarm communication.
Phone dialers shall not be considered as an equivalent.
C. Panel shall be Orenco Systems', Inc. TCOMTM control panel or engineer -approved equal,
meeting the following:
1. Data Collection and Utilization: Logs data for system conditions and events such as daily
flows, pump run time, pump cycles, and alarm conditions. Logs shall store data for at
least a year.
2. Downloadable Logs: Download logs into a *.dif or ASCII format for simple conversion
to common spreadsheet or word processor programs.
3. Multi -Level Password Security: Only qualified personnel can remotely access the site.
4. Program Logic Rules: Simple "If ... then" declarations.
5. Rules can be written based on several operands, including the following:
6. Input/output status
7. Point status
8. Date: mm/dd/yy format
9. Time of day: 24 hour clock
10. Timers
11. Historical data (allows for control optimization or detection of trends)
12. Schedule functions to control digital "Points" based on date or day of week/time.
13. Automatic daylight savings time adjustment.
14. Automatic call -out to pagers during alarm conditions when panel detects trends that could
lead to system failure.
D. In addition, the unit shall have the capability of real-time direct connection to the panel via
laptop serial port, to allow the operator real-time access to detailed logged data and the ability
to change point values.
1. Standard Components
a. Motor -Start Contactor: 17 FLA, 1-2 hp, 60 Hz; 2.5 million cycles at FLA (10 million
at 50% of FLA for 230VAC.
b. HOA 3- Way Toggle Switch: Single -pole switch, Hands (manual) Off, Auto ON. 20
amps, 1 hp.
c. Controls Circuit Breaker: 10 amps, OFF/ON switch. Single -pole 120 VAC. DIN rail
mounting with thermal magnetic tripping characteristics.
d. Pump Circuit Breaker: 20 amps, OFF/ON switch. Single -pole for 120 VAC or
double -pole for 230 VAC. DIN rail mounting with thermal magnetic tripping
characteristics.
e. Audio Alarm: 80 dB at 24", warble -tone sound.
f 120VAC Ground Fault Interrupter (GFI)
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 11
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

g. Current Sensor: 120 VAC with adjustable high & low alarm set points.
h. Surge Arrester: AG2401 120/230V, three 18" leads, rated for a maximum of
32,000amps, UL/CSA listed.
i. Visual Alarm: 7/8" diameter red lens, "push -to -silence." NEMA 4, 1-watt bulb, 115
VAC.
J. Panel Enclosure: NEMA 4X rated, constructed of UV -resistant fiberglass or stainless
steel or NEMA 4, constructed of steel; hinges and latch are stainless steel. Conduit
couplings provided.
k. Remote Telemetry Unit: ATRTU-Net; self powered 24 VDC at 10 mA max, 8 digital
inputs, 8 analog inputs expandable to 16 with expansion board. On -board modem
(9600 baud), Ethernet port (10 base T, RJ45jack) and Modbus port (R5422/485
terminals) .
1. Touch Screen Display: interface module with 5.7 color touch screen.
in. Flow Meter — Siemans, electromagnetic flow meter model MAG 3100, with
5000/6000 series transmitter. In addition to logging daily flows, flow meter shall log
flows on an hourly basis.
n. 1nRouter615-S cellular router. Cellular Router shall be capable of integrating 3G, 4G,
and LTE cell service for remote accessibility.
2. Optional Components
a. Variable Speed Drives: 4kW, 3-phase supply, 200 — 240VAC, 0.5 — 5Hp
b. Pump Run Light: 7/8" green lens. NEMA 4, 1-watt bulb, 120 VAC.
c. Effluent Alarm: 95db at 24", warble -tone sound.
d. Flashing Light: Lexan lens, flanged base, red, UL-recognized.
e. Heater: Anti -condensation heater. Self-adjusting, radiates additional wattage as
temperature drops.
f 3- Way (main, auto, off) manual transfer/disconnect switch
g. Dead front user interface
h. Event Counter: 120 VAC, 6-digit, non-resettable.
i. Elapsed Time Meter: 120 VAC, 7-digit, non-resettable. Limit of 99,999 hours;
accurate to 0.01 hours
2.08 CONTROL BUILDING
The control building shall be an Orenco Systems°, Inc. Fiberglass Shelter or engineered approved
equal to house controls and chemical feeders. The shelter shall be a complete seamless, molded,
one-piece enclosure constructed of an insulated foam -core wall monolithically poured. Wall
thickness shall be no less than 4-inches thick with a minimum insulation value of R12. Shelter
shall be capable of withstanding 130mph. The roof shall be capable of handling a 100psf live
load. The Manufacturer will provide a 10-year limited warranty on workmanship.
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 12
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

2.09 INSTALLATION
All treatment, pumping system, and electrical components shall be installed in accordance with
the MANUFACTURER'S recommendations, the engineer's plans, and all state and local
regulations.
2.10 LOCATION
The pump control panel shall be mounted beneath an awning or within a building nearest the tank
and pump. The panel, when possible, should be mounted in the shade and protected from the
weather. The panel should be located at a convenient height (usually about five feet above the
ground) and where it will be accessible for maintenance.
PART 3 - EXECUTION
3.01 PRECONSTRUCTION CONFERENCE
Before any work at the site is started, a conference attended by the OWNER, CONTRACTOR,
ENGINEER, MANUFACTURE, OPERATOR and others as appropriate will be held to
establish a working understanding among the parties as to the work involved for installing each
component of the treatment system. At this conference, the OWNER, CONTRACTOR,
ENGINEER, and MANUFACTURE shall designate, in writing, a specific individual to act as
INSPECTOR for the installation of the treatment system. Any cost or fees associated with the
services of the INSPECTOR or the ENGINEER during construction will be the responsibility of
the OWNER.
3.02 INSTALLATION AND FIELD TESTING TRAINING
The MANUFACTURER shall provide the services of a trained representative to instruct the
installing CONTRACTOR'S crew and INSPECTOR regarding the proper installation and field
testing of each component per the MANUFACTURER'S recommendations and requirements.
The MANUFACTURER shall have a trained representative provide installation and field testing
training services for a minimum of one (1) visit of a minimum of one (1) eight -hour day at the
beginning of construction.
3.03 QUALITY CONTROL
A. To ensure quality control, the INSPECTOR shall inspect and certify that an initial
installation of the AdvanTex system is in compliance with the MANUFACTURER'S
recommendations and requirements.
B. Upon completion of the inspection, the INSPECTOR, in coordination with the ENGINEER,
shall perform or direct the CONTRACTOR to perform any required adjustments to the
equipment and place into operation under the supervision of the ENGINEER. All equipment
and materials required to perform the testing shall be the responsibility of the
CONTRACTOR. A letter of completion shall be signed by the INSPECTOR and copies
faxed, emailed, or mailed to the ENGINEER and MANUFACTURE within one (1) week of
the AdvanTex® system being installed and prior to System Commissioning.
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 13
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

C. The MANUFACTURER shall provide the services of a trained representative for a
minimum of one (1) visit of a minimum of one (1) eight -hour day for the purpose of
quality control during construction.
3.04 SYSTEM COMMISSIONING
A. The MANUFACTURER shall provide the services of a trained representative for training the
OWNER'S service provider, and inspecting the AdvanTex installation. The inspection will
include items covered from the installation training. Upon system commissioning, the
MANUFACTURER'S trained representative shall provide the ENGINEER a written report
of findings. The ENGINEER should then perform or direct the CONTRACTOR to perform
any required adjustments to the equipment and place into operation. All equipment and
materials required to perform additional testing shall be the responsibility of the
CONTRACTOR. The MANUFACTURER shall submit to the ENGINEER and OWNER,
a detailed start-up checklist, according to the manufacturer's inspection and startup
procedures.
B. The MANUFACTURER shall provide the services of a trained representative for a minimum
of one (1) visit of a minimum of one (1) eight -hour day for the purpose of system
commissioning.
PART 4 — OPERATION AND MAINTENANCE
4.01 OPERATION AND MAINTENANCE MANUALS
The MANUFACTURER shall provide five (5) operation and maintenance manuals, four (4) to
be sent to the OWNER, and one (1) sent to the ENGINEER.
4.02 SPARE PARTS
The MANUFACTURER shall provide spare nozzles, spare pumps, and spare control panel parts.
4.03 OPERATION AND MAINTENANCE TOOLS
A. AX LATERAL BRUSH CLEANING KIT
MANUFACTURER shall provide a minimum of one (1) AX Lateral Brush Cleaning Kit.
This kit shall include 90-inch lateral cleaning brush used to clean 1-1/4" diameter laterals and
shall be Orenco Systems°, Inc., OM-AX-LAT BRUSH CLEANING KIT or ENGINEER -
approved equal.
B. AX SHEET CLEANING WAND
MANUFACTURER shall provide a minimum of one AX sheet -cleaning wand. Wand shall
be Orenco Systems', Inc. model OM-AX-CLEANING WAND or ENGINEER -approved
equal. Cleaning wand shall have the ability to connect to a standard garden hose, and fit in
between AX sheets to spray off debris.
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 14
Orenco Systems, Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

C. FIELD TEST KIT
MANUFACTURER shall provide a field test kit to monitor the following parameters:
a. pH
b. Alkalinity
c. Ammonia (NH3-N)
d. Nitrate/Nitrite (NO3-N / NOz-N)
e. Dissolved Oxygen (DO)
f Chlorides
g. Turbidity
h. Temperature
The field test kit shall include:
a. pH test strips (0-14 pH)
b. Alkalinity test strips (0-240 ppm)
c. Ammonia (NH3-N) test strips (0-6 ppm)
d. Nitrate/Nitrite (NO3-N / NOz-N) test strips (0-50 ppm)
e. Dissolved Oxygen (DO) kit (1-12 ppm)
f Chloride titrators (30-600 ppm & 300-6000 ppm)
g. Turbidity kit (0-200 NTUs)
h. Thermometer (0-240' F)
D. SCUM MEASURING DEVICE
MANUFACTURER shall provide a minimum of one (1) scum measuring utility
gauge. The gauge shall consist of a minimum 3/8" diameter stainless steel rod
with an incremental scale for measuring scum levels. The rod shall be bent at a
90-degree angle at the base to aid in identifying the scum "by feeling." The gauge
shall be Orenco Systems®, Inc. Model SMUG or ENGINEER -approved equal.
E. SLUDGE MEASURING DEVICE
MANUFACTURER shall provide a minimum of one (1) SLUDGE JUDGE° ULTRA or
ENGINEER -approved equal. Unit shall be constructed of polycarbonate treated with an
ultraviolet stabilizer, durable in cold temperatures, and can withstand heat up to 280' F.
The measuring device shall be 3/4" diameter and marked with tape to designate 1 ft
increments.
Orenco Systems° Inc.
NSP-ATX-SPEC-3
Rev. 2.3 10118
AdvanTex Another Carefully Engineered Product From: Orenco Systems® Inc. 15
Orenco Systems , Inc. 9 814 Airway Avenue, Sutherlin, Oregon 97479, USA 9 800-348-9843 9 541-459-4449 9 www.orenco.com

Engineers and Soil Scientists
Agri -Waste Technology, Inc.
501 N. Salem Street, Suite 203
Apex, North Carolina 27502
919-859-0669
www.agriwaste.com
Mr. Michael Clayton
Sales Manager
AQWA Treatment and Collections Solutions
1507 Drexel St N
Wilson, NC 27893
November 16, 2022
SUBJECT: Engineering Calculation Review for the Riversound Subdivision
Dear Mr. Clayton,
Per your request, I have reviewed several documents regarding the proposed wastewater
treatment system for the Riversound Subdivision. Reviewed documents include:
- Letter dated 10-14-2022 from Mr. Connor Gilham of Orenco Sysems to Mr.
Joseph J. Anlauf, Anlauf Engineering, PLLC (Design Review).
- Drawing DR5043.DWG UNC Riversound Subdivision AdvanTex AX-Max
Treatment, System Details.
Treatment Sizing Calculations provided by Mr. Colton Janes, P.E. of AQWA,
INC. referencing the system design.
Based on my review, I offer the following recommendations:
- Revise the "Denite" pump from PF500712 to P17200512.
With proper operation and maintenance of the system, including the proper addition of
alkalinity and carbon, I agree with the conclusions drawn in the Orenco Design Review
regarding the expected final effluent quality. I appreciate your time and efforts in
reviewing this information and I will be glad to discuss this information with you. If you
have any questions or comments, please feel free to contact me at 919-859-0669 or via
email at [e-mail].
Best Regards,
Kevin Davidson, P.E.
VP of Engineering
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10-14-2022
Joseph J Anlauf
Anlauf Engineering, PLLC
4721 W. Eckner St
Kitty Hawk, NC
PROTECTING THE WORLD'S WATER
Subject: Final Design Review of UNC Riversound Subd
Mr. Joseph Anlauf
Orenco Systems, Inc. ("Orenco") has received the Plans with all required fields completed (attached to
this letter), a copy of the plan set showing the designed site layout and configuration plans, and other
documents that comprise the Final Design for the UNC Riversound Subd project. Orenco staff reviews
the Final Design of all wastewater collection and treatment systems for commercial applications to ensure
that the design is compliant with the most current version of the system's applicable design criteria
published by Orenco for the specified parameters provided by the system's designer in the Plans. The
findings and conclusions of my review of this Final Design are as follows:
Design Basis
The system has been designed for a Type 1, New Subdivision application. Influent flow and constituent
concentrations and effluent constituent concentration requirements have been provided by the system's
designer on the attached Plans and were used in my review of the Final Design.
The influent flow on the Plans were extrapolated from metered flows from the subject site. As such, I
have no reason to doubt the accuracy of the designer's findings and assumptions as to the influent flow
and find that it was reasonable for the designer to use them as the design basis for the system.
System Design
The proposed Final Design of the system consists of 1 - 20,000 U.S. Gallon Primary tank and 1 - 10,000
U.S. Gallon Primary tank in series for primary treatment where flow will be split equally by equalization
pumps across three identical treatment units. The units are combined units consisting of three stages of
treatment. The first stage in each unit specifies 150 square feet of treatment media, which leads to a
denitrification stage (non-Orenco treatment), and finally to a third stage of treatment consisting of 50
square feet of treatment media for final polishing. The treated effluent is then discharged for UV treatment
before final disposal.
Design Criteria
The applicable design criteria for this system, which I used to conduct the review of its Final Design, is
revision 8.0 of document NDA-ATX-1, titled Orenco® AdvanTex® Design Criteria, Commercial

Treatment Systems, which was published by Orenco in October, 2020. A copy of the design criteria can
be downloaded from Orenco's online document library at www.orenco.com/corporate/doclibrary.cfm.
Findings
The findings of my review as to whether the Final Design complies with Orenco's design criteria for
treating wastewater to the effluent constituent concentration requirements provided in the Plans are as
follows:
Primary Treatment
Orenco always recommends the use of a pre -anoxic return tank and requires them on all projects that
require significant nitrogen reduction. The primary treatment system will include tank volumes of 30,000
U.S. Gallons. This pre -anoxic tank should be sized equal to one day at maximum day design flow and is
considered part of the overall primary tank volume. The Final Design specifies the use of (1) - 20,000
U.S. Gallon Primary and (1) - 10,000 U.S. Gallon Primary tank in series for primary treatment. Using the
flow data specified on the Plans the hydraulic retention times for primary treatment calculate as follows:
Primary Tank(s) Hydraulic Retention Time (HRT)l
Design Average Flow Design Maximum Day Effective Combined Avg HRT (days) Max Day HRT (days)
(gpd) Flow (gpd) Primary Tankage (gpd)
8,000 10,000 30,000 3.8 3.0
1 T)—i— T%4— T)— Tl—, ;. the ,»aY;,»— Iaih' flue.,, a f—il;t., ;. PY—t—1 tn rP—i— — ,. — A— — Ala., with;,, —, .—A-'. ti—
The Primary Tank Sizing Recommendations states that the recommended primary tankage for a New
Subdivision treatment system should be sized to at a minimum of 2 days of hydraulic retention time at
the Design Max Day Flow. Therefore, the configuration and specifications of the primary treatment tanks
in the Final Design satisfy Orenco's recommendation for primary tankage for this New Subdivision
application. This pre -anoxic tank should be sized equal to one day at maximum day design flow and is
considered part of the overall primary tank volume.
Recirculation Tank— Standard Stage
The Final Design further specifies the use of an AX-Max Treatment System for recirculation and blending
of the AdvanTex-treated effluent with primary tank effluent. The recirculation volume in the AX-Max
System satisfies the requirement for recirculation tank volume.
Hydraulic Load— Standard Stage
The Final Design specifies the use of three combined AX units wherein the flow is split equally across
each with a first stage containing 150 square feet of treatment media, which together contain a nominal
surface area of 450 square feet of treatment media. Using the flow data specified on the Plans the
hydraulic loading rate for the system calculates as follows:

Design Average Flow
(gpd)
Design Maximum Day
Flow (gpd)
Nominal Textile Area
(sq. ft.)
Average HLR (gal. per
day/sq. ft.)
Peak HLR (gal. per
day/sq. ft.)
8,000
10,000
450
17.8
22.2
According to the AdvanTex System Loading Chart in the applicable design criteria, the standard
AdvanTex treatment system (Stage 1) should not be hydraulically loaded more than 25 gpd/square foot
at Design Average Flow or 50 gpd/square foot at Design Max Day Flow. Therefore, the specified type
and number of AdvanTex units in the Final Design satisfy Orenco's design criteria to achieve the effluent
quality listed in the design criteria at a 95% confidence level for this Type 1, New Subdivision application.
Organic Load — Standard Stage
The following influent characteristics provided on the Plans were estimated and not derived from direct
sampling. Even though the influent characteristics were not derived from direct sampling, the values
provided are lower but acceptable values than we typically see in other, similar Type 1, New Subdivision
applications.
Based on the average influent biochemical oxygen demand (BODs) concentration and flow data specified
on the Plans, the system will receive approximately 6.7 pounds of BODs per day at Design Average Flow,
and 8.3 pounds of BODs per day at Maximum Day Design Flow. Using this information, the organic
loading rate of the system calculates as:
According to the Organic Load Requirements in the applicable design criteria, an AdvanTex Treatment
System should not be organically loaded more than 0.04 pounds BODs/square foot at Design Average
Flow or 0.08 pounds BODs/square foot at Design Peak Flow. Therefore, the specified type and number
of AdvanTex units in the final design satisfy Orenco's design criteria to achieve the effluent quality listed
in the design criteria at a 95% confidence level for this Type 1, New Subdivision application.
Nitrogen Reduction — Standard Stage
According to the Nitrogen Reduction Standards in the applicable design criteria, the standard
configuration of a single -stage AdvanTex Treatment System will typically achieve 60% reduction of
Total Nitrogen, depending on wastewater strength and other characteristics such as BOD5, grease and
oils, pH, and alkalinity concentrations, primary treatment hydraulic retention time, or temperature.

Total Kjeldahl Nitrogen (mg/L) Reduction Percentage
70 >_ 60%
Based on the average influent Total Kjeldahl Nitrogen (mg/L) concentrations and other influent
constituent concentrations and flow data specified on the Plans the nitrogen loading for the standard stage
calculates as follows:
The standard stage loading is 0.014 pounds per day/square foot based on Design Average Flow.
Therefore, the specified type and number of AdvanTex units in the final design satisfy Orenco's design
criteria to achieve the effluent quality listed in the design criteria at a 95% confidence level for this Type
1, New Subdivision application.
Ammonia Reduction — Standard Stage
According to the Ammonia Reduction Standards in the applicable design criteria, the standard
configuration of a single -stage AdvanTex Treatment System will typically achieve 95% reduction of
Ammonia -Nitrogen, depending on wastewater strength and other characteristics such as BOD5, grease
and oils, pH, and alkalinity concentrations, primary treatment hydraulic retention time, or temperature.
The standard stage loading is as follows:
For Ammonia -Nitrogen reduction, the ammonia loading rate is 0.01 pounds per day/square foot based on
Design Average Flow. Therefore, the specified type and number of AdvanTex units in the final design
satisfy Orenco's design criteria to achieve the effluent quality listed in the design criteria at a 95%
confidence level for this Type 1, New Subdivision application.
Denitrification
This system includes denitrification and therefore the subsequent Orenco equipment has been configured
based on the expected denitrification chamber effluent. The denitrification treatment has specified it will
be providing 80% denitrification, resulting in an expected effluent NOs concentration of 4 mg/L. The
denitrified effluent concentration is what is being considered in this proceeding portion of the Design
Review.
Orenco utilizes Metcalf and Eddy textbook values when sizing a denitrifying MNBBR. The key
parameters include:

• SALR or flux rates in the post -anoxic stage range from 0.5 -1.0 g NOs/m' •d (0.012-0.024 lbs
NO3/ft2•d) depending on the carbon source utilized.
• Dissolved oxygen levels < 0.5 mg/L (preferably < 0.2 mg/L) to ensure that nitrate becomes the
primary oxygen source for microorganisms. A clarification stage can be placed between the
nitrification stage and the post -anoxic stage to ensure that these levels are achieved prior to the post -
anoxic stage.
• Carbon -to -nitrogen ratio of 4:1 to 8:1. A supplemental carbon feed unit is required for the post -
anoxic stage to achieve the necessary carbon -to -nitrogen ratio for effective denitrification.
• Sufficient residual alkalinity (100 mg/L ±) in the secondary treatment stage to ensure optimum pH
in the post -anoxic stage.
For standard post -anoxic treatment meeting the conditions above, reduction of nitrate (NO3) through
conversion to nitrogen gas (Nz) is approximately 80-90%. When sizing the reactor, a removal rate of
98% should be used in the calculations to conservatively determine the media and reactor volumes.
As long as the design parameters fall within the ranges provided, we would expect the denitrification
system to meet the expectations provided in the design documents.
Hydraulic Load — Polishing Stage
The Final Design specifies the use of three combined AX units wherein the flow is split equally across
each with a polishing stage containing 50 square feet of treatment media, which together containing a
nominal surface area of 150 square feet of treatment media. Using the flow data specified on the
Engineered Project Questionnaire, the hydraulic loading rate for the system calculates as follows:
According to the AdvanTex System Loading Chart in the applicable design criteria, the AdvanTex
treatment system (Stage 3) should not be hydraulically loaded more than 75 gpd/square foot at Design
Average Flow or 125 gpd/square foot at Design Max Day Flow. Therefore, the specified type and number
of AdvanTex units in the Final Design satisfy Orenco's design criteria to achieve the effluent quality
listed in the design criteria at a 95% confidence level for this Type 1, New Subdivision application.
Organic Load — Polishing Stage
Based on the average influent biochemical oxygen demand (BOD5) concentration and flow data specified
on the Plans and the anticipated performance from the denitrification stage, the system will receive
approximately 0.67 pounds of BOD5 per day at Design Average Flow. Using this information, the organic
loading rate of the system calculates as:

According to the Organic Load Requirements in the applicable design criteria, an AdvanTex Treatment
System should not be organically loaded more than 0.02 pounds BODs/square foot at Design Average
Flow. Therefore, the specified type and number of AdvanTex units in the final design satisfy Orenco's
design criteria to achieve the effluent quality listed in the design criteria at a 95% confidence level for
this Type 1, New Subdivision application.
Nitrogen Reduction — Polishing Stage
The nitrogen loading for the polishing stage is as follows:
For Total Nitrogen reduction in the polishing stage, the loading rates of 0.007 pounds per day/square foot
based on Design Average Flow should not be exceeded. Therefore, the specified type and number of
AdvanTex units in the final design satisfy Orenco's minimum design criteria to achieve the effluent
quality listed in the design criteria at a 95% confidence level for this Type 1, New Subdivision application.
Ammonia Reduction — Polishing Stage
The ammonia loading in the polishing stage loading is as follows:
For Ammonia -Nitrogen reduction, the ammonia loading rates of 0.005 pounds per day/square foot based
on Design Average Flow should not be exceeded. Therefore, the specified type and number of AdvanTex
units in the final design satisfy Orenco's minimum design criteria to achieve the effluent quality listed in
the design criteria at a 95% confidence level for this Type 1, New Subdivision application.
Conclusions
I have reviewed the Final Design of the UNC Riversound Subd wastewater treatment system and have
found that the design is compliant with the most current version of the system's applicable design criteria
published by Orenco for the specified parameters provided by the system's designer in the Plans. In
addition, I noted no anomalies in the site layout or configuration of the system during my review.
Compliance Table — Meets Minimum
Design Standards
Standard Stage
Polishing Stage
Recirc Tank Size
Yes
Yes
Hydraulic Load
Yes
Yes
Organic Load
Yes
Yes
Nitrogen Load
Yes
Yes

Ammonia Load Yes Yes
As such, the system as designed satisfactorily complies with Orenco's design criteria to meet the
following effluent limits specified in the Plans at a 95% confidence level, provided that all influent flows
and constituent concentrations specified in the Plans are not exceeded:
Expected Effluent Quality
Constituent
Average (mg/L)
BOD5
<_ 10
TSS
<— 15
Total Nitrogen
<_ 14
Ammonia
<_ 4
It is important to note that even though the AdvanTex Treatment System has the capability to meet or
exceed the required treatment parameters, there is no way that Orenco can guarantee that a particular
system will be operated or maintained in a manner consistent with the Final Design reviewed. Once the
facility is placed into operation, the influent flows and constituent concentrations to the facility should be
monitored, and if flow or any of the influent constituent concentrations exceed those listed in the Plans,
measures should be taken to reduce the flow or constituent concentration to those listed. However, if
additional treatment capacity becomes necessary, the system is designed to have the capability to expand
to account for the new flow or constituent concentration.
Proper air ventilation is a critical feature of all commercial AdvanTex Treatment Systems, and as such,
adequate active ventilation is required for all systems. In addition, please note that disposing of toxics or
chemicals into the system is strictly prohibited. Examples of toxics include restaurant degreasers,
cleansers, wax strippers for linoleum, carpet shampoo, waste products, or any other toxins. Furthermore,
water softener brine discharge is prohibited from being discharged into the AdvanTex Treatment System.
Failure to adhere to these policies will void Orenco's limited product warranties.
If you have any questions about my review process, findings, or conclusions, please feel free to call or e-
mail me.
Sincerely,
co**� MLIX...
Connor Gilham
Sales Engineer
Orenco Systems Inc.
ADVANTEX DESIGN REVIEW 7

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Influent Characteristics
Average Max Flow Effluent Permit
BOD51 300 mg/L 350 mg/L Average Daily Flow 3,350 gpd BODS, 10.0 mg/L
TSS SO mg/L 140 mg/L Max Daily Flow 6,300 gpd TSS 15.0 mg/L
TKN, 70 mg/L SO mg/L NH3 4.0 mg/L
NH3-N 63 mg/L mg/L TN 14.0 mg/L
Alkalinity 120 mg/L 120 mg/L NO3 10.0 mg/L
Average Max
BODs, 150 mg/L 175 mg/L Primary Removal 50%
AFTER TSS SO mg/L 140 mg/L Primary Removal 0%
PRIMARY TKN, 70 mg/L SO mg/L
NH3-N 63 mg/L 0 mg/L
Alkalinity 120 mg/L 120 mg/L
After Standard AdvanTex Treatment
Alkalinity mg/L
Ib/d
BOD3iiei mg/L
Demand 400
TSS(,,) mg/L
Assume95% 0.95
Need 380
11
per treatment train
TKN(,,) 3.5 mg/L
NH3iiei mg/L
NO3iiei mg/L
0.55738305 Ibs
Carbon
TN,, mg/L
MicroC Dose
at Ave Day
0.39 gpd
MicroC Dose at Max Day
0.73 gpd
After MMBRd Stage
C:N Ratio*
0.75 (*4 is good)
BOD3iieJ 3
mg/L**
Adding carbon to optimize the denitrification process -
TSSheJ W11
mg/L***
Multiplying the TSS by a factor ofthree as a safety factor
TKN(,,) 3.5 mg/L
NH3iiei mg/L
NO3iiei mg/L
90% Reduction in MBBRcl
TNMBBRd mg/L
After Polish AdvanTex Treatment
M mg/L
TSS,
TSS
TKN, 0.175 mg/L
NH3mg/L
NO3: mg/L
Assuming MBBRcl
TN, mg/L
First Stage Average Q
Textile Sizing ftz 140 Designed for TN Reduction
Organic Loading 105
Hydraulic Loading (Ave) 134
Hydraulic Loading (Max) 126
Total Nitrogen Loading 140
Ammonia Loading 176 *Per Orenco design criteria, Ammonia limit drives design when permit requires >95%Ammonia removal from a single stage
Second Stage
Textile Sizing ftz 50
Organic Loading 21
Hydraulic Loading (Ave) 45
Hydraulic Loading (Max) 50
Total Nitrogen Loading 14
Removal
SO

Determine mass load in AdvanTex systems
Mass Load Ibs/d
m
Concentration x (8.34 x 10-6) x Flow (gpd)
Determine standard Advantex stage sizine
Design Avg
US Units
Design Max
US Units
Organic Loading Rate (OLR)
0.04
Ibs BODS/ftZ*d
0.08
Ibs BODS/ftZ*d
Hydraulic Loading Rate (HLR)
25
gpd/ft2
50
gpd/ft2
Total Nitrogen Loading Rate (TNLR)
0.014
Ibs TN/ft2*d
0.028
Ibs TN/ft2*d
Ammonia Loading Rate (ALR)
1 0.01
Ibs NH3-N/ft2*d
1 0.02
1 Ibs NH3-N/ft2*d
Second stage Advantex sizing in two -stage system
For Calcs
0.00000834
Design Avg
US Units
Design Max
US Units
Organic Loading Rate (OLR)
0.02
Ibs BODS/ft2*d
0.04
Ibs BODS/ft2*d
Hydraulic Loading Rate (HLR)
75
gpd/ft2
125
gpd/ft2
Total Nitrogen Loading Rate (TNLR)
0.007
Ibs TN/ft2*d
0.014
Ibs TN/ft2*d
Ammonia Loading Rate (ALR)
1 0.005
Ibs NH3-N/ft2*d
1 0.01
1 Ibs NH3-N/ft2*d
Determining anticipated treatment performance from standard AdvanTex systems
Based on BODS
BODse = BODSL x (1 — CBR)
BOD5e BODS effluent from standard Advantex stage
BOD5j BODSprimary treated effluent value
CBR 0.9 coefficient
Based on TKN or NH3-N
TKNe = TKN, x (1 — CNR)
TKNe TKN effluent from standard Advantex stage
TKN; TKN primary treated effluent value
CNR 0.95 coefficient
Based on NO3
NO3e = (TKNL—TKNe) x (1 — CDNR)
N O3e
TKN;
TKNe
CDNR
Based on TN
TNe = TKNe +NO3e
TNe
TKNe
N O3e
NO3 effluent from standard Advantex stage
TKN primary treated effluent value
TKN effluent from standard Advantex stage
0.7 coefficient
TN effluent from standard Advantex stage
TKN effluent from standard Advantex stage
NO3 effluent from standard Advantex stage

Determining anticipated treatment performance for total nitrogen from post -anoxic AdvanTex treatment stages
TNPAe = TKNe + NO3e X (1 — CDNR)
TNPAe TN effluent from standard Advantex stage
TKNe TKN effluent from standard Advantex stage
NO3e NO3 effluent from standard Advantex stage
CDNR 0.7 coefficient
Alkalinity
Alkalinity Demand
mg mg S L9Alkalinity
Alkalinity Demand ( L) = TKNI(L) X imgrxN
L
TKN; TKN primary treated effluent value
Alkalinity Need (L) = Alkalinity Demand (Lg) + Target Residual Alkalinity — Influent Alkalinity
Typical Target Residual 100 mg/L
Type 1
Domestic (Primary Treated)
Average
Max
BOD;
140
mg/L
250
mg/L
TSS;
40
mg/L
140
mg/L
TKN;
50
mg/L
80
mg/L
Type 2
Campgrounds/RV/Offices
Average
Max
BOD;
300
mg/L
500
mg/L
TSS;
80
mg/L
250
mg/L
TKN;
90
mg/L
200
mg/L
Type 3
Schools/Churches
Average
Max
BOD;
300
mg/L
500
mg/L
TSS;
80
mg/L
250
mg/L
TKN;
90
mg/L
150
mg/L
Type 5
Restaurants/Gas Stations
Average
Max
BOD;
300
mg/L
1000
mg/L
TSS;
80
mg/L
300
mg/L
TKN;
90
mg/L
200
mg/L
Primary Tank Sizing Notes
Type Description Value (HRT) Primary Tank Sizing' 1 Assumming no aeration.
Type 1 Domestic (Primary Treated) 2 2 Times the Max Daily Flow
Type 2 Campgrounds/RV/Offices 3 3 Times the Max Daily Flow
Type 3 Schools/Churches 3 3 Times the Max Daily Flow
Type 5 Restaurants/Gas Stations 3 3 Times Max Day flow for Primary Tank and Must have Anoxic Tank
Anoxic Tank Sizing Notes
Type Description Value (HRT) Anoxic Tank Notes'
Type 1 Domestic (Primary Treated) 1 Reduce Primary Tankage by 1 Times Max Day to Add Anoxic Tank
Type 2 Campgrounds/RV/Offices 1 Reduce Primary Tankage by 1 Times Max Day to Add Anoxic Tank
Type 3 Schools/Churches 3 Reduce Primary Tankage by 1 Times Max Day to Add Anoxic Tank
Type 5 Restaurants/Gas Stations 1 1 times Max Day for the Anoxic Tank

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Influent Characteristics
Average Max Flow Effluent Permit
BOD51 200 mg/L 250 mg/L Average Daily Flow 5,000 gpd BODS, 10.0 mg/L
TSS SO mg/L 140 mg/L Max Daily Flow 10,000 gpd TSS 15.0 mg/L
TKN, 70 mg/L SO mg/L NH3 4.0 mg/L
NH3-N 52.5 mg/L mg/L TN 14.0 mg/L
Alkalinity 120 mg/L 120 mg/L NO3 10.0 mg/L
Average Max
BODs, 100 mg/L 125 mg/L Primary Removal 50%
AFTER TSS SO mg/L 140 mg/L Primary Removal 0%
PRIMARY TKN, 70 mg/L SO mg/L
NH3-N 52.5 mg/L 0 mg/L
Alkalinity 120 mg/L 120 mg/L
After Standard AdvanTex Treatment
Alkalinity mg/L
Ib/d
BOD3i1ei 10 mg/L
Demand 400
TSS(,,) � mg/L
Assume 95% 0.95
Need 380
25
TKN(,,) 3.5 mg/L
NH3iiei mg/L
NO3iiei mg/L
1.331064 Ibs
Carbon
TN,, mg/L
MicroC Dose
at Ave Day
0.93 gpd
MicroC Dose at Max Day
1.16 gpd
After MMBRd Stage
C:N Ratio*
0.50 (*4 is good)
BOD3iieJ 3
mg/L**
Adding carbon to optimize the denitrification process -
TSSheJ W11
mg/L***
Multiplying the TSS by a factor ofthree as a safety factor
TKN(,,) 3.5 mg/L
NH3iiei mg/L
NO3iiei mg/L
90% Reduction in MBBRcl
TNMBBRd mg/L
After Polish AdvanTex Treatment
M mg/L
TSS,
TSS
TKN, 0.175 mg/L
NH3mg/L
NO3: mg/L
Assuming MBBRcl
TN, mg/L
First Stage Average Q
Textile Sizing ftz 334 Designed for TN Reduction
Organic Loading 167
Hydraulic Loading (Ave) 320
Hydraulic Loading (Max) 200
Total Nitrogen Loading 334
Ammonia Loading 350 *Per Orenco design criteria, Ammonia limit drives design when permit requires >95%Ammonia removal from a single stage
Second Stage
Textile Sizing ftz 107
Organic Loading 33
Hydraulic Loading (Ave) 107
Hydraulic Loading (Max) SO
Total Nitrogen Loading 33
196
1466.08
Removal
SO

Determine mass load in AdvanTex systems
Mass Load Ibs/d
m
Concentration x (8.34 x 10-6) x Flow (gpd)
Determine standard Advantex stage sizine
Design Avg
US Units
Design Max
US Units
Organic Loading Rate (OLR)
0.04
Ibs BODS/ftZ*d
0.08
Ibs BODS/ftZ*d
Hydraulic Loading Rate (HLR)
25
gpd/ft2
50
gpd/ft2
Total Nitrogen Loading Rate (TNLR)
0.014
Ibs TN/ft2*d
0.028
Ibs TN/ft2*d
Ammonia Loading Rate (ALR)
1 0.01
Ibs NH3-N/ft2*d
1 0.02
1 Ibs NH3-N/ft2*d
Second stage Advantex sizing in two -stage system
For Calcs
0.00000834
Design Avg
US Units
Design Max
US Units
Organic Loading Rate (OLR)
0.02
Ibs BODS/ft2*d
0.04
Ibs BODS/ft2*d
Hydraulic Loading Rate (HLR)
75
gpd/ft2
125
gpd/ft2
Total Nitrogen Loading Rate (TNLR)
0.007
Ibs TN/ft2*d
0.014
Ibs TN/ft2*d
Ammonia Loading Rate (ALR)
1 0.005
Ibs NH3-N/ft2*d
1 0.01
1 Ibs NH3-N/ft2*d
Determining anticipated treatment performance from standard AdvanTex systems
Based on BODS
BODse = BODSL x (1 — CBR)
BOD5e BODS effluent from standard Advantex stage
BOD5j BODSprimary treated effluent value
CBR 0.9 coefficient
Based on TKN or NH3-N
TKNe = TKN, x (1 — CNR)
TKNe TKN effluent from standard Advantex stage
TKN; TKN primary treated effluent value
CNR 0.95 coefficient
Based on NO3
NO3e = (TKNL—TKNe) x (1 — CDNR)
N O3e
TKN;
TKNe
CDNR
Based on TN
TNe = TKNe +NO3e
TNe
TKNe
N O3e
NO3 effluent from standard Advantex stage
TKN primary treated effluent value
TKN effluent from standard Advantex stage
0.7 coefficient
TN effluent from standard Advantex stage
TKN effluent from standard Advantex stage
NO3 effluent from standard Advantex stage

Determining anticipated treatment performance for total nitrogen from post -anoxic AdvanTex treatment stages
TNPAe = TKNe + NO3e X (1 — CDNR)
TNPAe TN effluent from standard Advantex stage
TKNe TKN effluent from standard Advantex stage
NO3e NO3 effluent from standard Advantex stage
CDNR 0.7 coefficient
Alkalinity
Alkalinity Demand
mg mg S L9Alkalinity
Alkalinity Demand ( L) = TKNI(L) X imgrxN
L
TKN; TKN primary treated effluent value
Alkalinity Need (L) = Alkalinity Demand (Lg) + Target Residual Alkalinity — Influent Alkalinity
Typical Target Residual 100 mg/L
Type 1
Domestic (Primary Treated)
Average
Max
BOD;
140
mg/L
250
mg/L
TSS;
40
mg/L
140
mg/L
TKN;
50
mg/L
80
mg/L
Type 2
Campgrounds/RV/Offices
Average
Max
BOD;
300
mg/L
500
mg/L
TSS;
80
mg/L
250
mg/L
TKN;
90
mg/L
200
mg/L
Type 3
Schools/Churches
Average
Max
BOD;
300
mg/L
500
mg/L
TSS;
80
mg/L
250
mg/L
TKN;
90
mg/L
150
mg/L
Type 5
Restaurants/Gas Stations
Average
Max
BOD;
300
mg/L
1000
mg/L
TSS;
80
mg/L
300
mg/L
TKN;
90
mg/L
200
mg/L
Primary Tank Sizing Notes
Type Description Value (HRT) Primary Tank Sizing' 1 Assumming no aeration.
Type 1 Domestic (Primary Treated) 2 2 Times the Max Daily Flow
Type 2 Campgrounds/RV/Offices 3 3 Times the Max Daily Flow
Type 3 Schools/Churches 3 3 Times the Max Daily Flow
Type 5 Restaurants/Gas Stations 3 3 Times Max Day flow for Primary Tank and Must have Anoxic Tank
Anoxic Tank Sizing Notes
Type Description Value (HRT) Anoxic Tank Notes'
Type 1 Domestic (Primary Treated) 1 Reduce Primary Tankage by 1 Times Max Day to Add Anoxic Tank
Type 2 Campgrounds/RV/Offices 1 Reduce Primary Tankage by 1 Times Max Day to Add Anoxic Tank
Type 3 Schools/Churches 3 Reduce Primary Tankage by 1 Times Max Day to Add Anoxic Tank
Type 5 Restaurants/Gas Stations 1 1 times Max Day for the Anoxic Tank

Start -Up, Maintenance, and Troubleshooting
of AdvanTex AX-Max and AX-Mobile
wamovamr lti"P.at11ent Systems
Oul renco
800-348-9843•[phone]
www.orenco.com
www.vericomm.net

About Orenco
Since 1981, Orenco Systems®, Inc. has researched, designed, and manufactured leading -edge
decentralized wastewater treatment technologies. We are one of the nation's leading manufacturers and
suppliers of equipment for the collection and treatment of wastewater. At Orenco, we specialize in the
manufacture of complete treatment systems for residential, commercial and community applications.
Wastewater collection and treatment is our only job. When you purchase an Orenco system, you can be
confident you have chosen the best equipment available.
Assistance
In addition to providing quality equipment, Orenco prides itself on its outstanding customer service and
technical assistance. Should you have any questions regarding your system, components, instructions, or
this 0&M Manual, please contact us for assistance. Please include the name and location of your project
or system with any correspondence, so we can quickly respond to your request.
When Your Equipment Arrives
Inspect your order for completeness and inspect each component for shipping damage. Check to be
sure that the instructions and items supplied comply with your state and local regulations. Carefully
read and follow all instructions. Be aware that improper system or component installation may void
warranties.
System Operators
To get the most from your Commercial AdvanTex Treatment System, we recommend that operation and
maintenance functions be performed by an operator trained by Orenco on AdvanTex Treatment Systems.
If you do not have a trained operator for your system or you would like more information on Orenco's
operator training, please contact Orenco at (800) 348 -9843 or [phone].Or visit us at our
Web site: www.orenco.com/systems/.
All product and performance assertions are based on proper design, installation, operation, and maintenance according to Orenco's current published documentation.
........................................................................................
NIN-0W-V1 -1, Rev. 1, 06/22 Copyright 0renco Systems®, Inc. Property of 0renco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-3W9843.

Introduction
AboutOrenco®.............................................................................. 2
Assistance..................................................................................... 2
When Your Equipment Arrives ...................................................... 2
System Operators......................................................................... 2
About the AdvanTex° AX-MaxTM and
AX-MobileTM Treatment Systems
PrimaryTankage........................................................................... 4
Equalization Tankage.................................................................... 4
AnoxicTankage............................................................................. 4
TreatmentUnits............................................................................. 4
Second -Stage Units...................................................................... 5
Start -Up & Operation
Introduction................................................................................... 6
Roles and Responsibilities............................................................ 6
Safety Precautions........................................................................ 6
Recommended Tools and Equipment ........................................... 6
Pre -Start -Up Inspection Points ..................................................... 7
Start -Up & Operation Inspection Points and Steps ..................... 7
ControlPanels........................................................................... 7
PrimaryTanks........................................................................... 8
EqualizationTanks..................................................................10
Pump Operation for Primary and Equalization Tanks ............ 10
Pump Amperage Chart...........................................................11
TankTimer Settings................................................................12
Quarterly Maintenance...........................................................17
Semi -Annual Maintenance.....................................................17
AnnualMaintenance...............................................................18
BiennialMaintenance.............................................................18
Corrective Maintenance..............................................................19
High Liquid Level Alarm..........................................................19
Low Liquid Level Alarm..........................................................
20
Removing & Replacing Inoperative Floats .............................
20
Removing & Replacing Inoperative Pumps ............................
20
System Performance and
Nitrogen Reduction Process
System Performance.................................................................. 21
Nitrogen Reduction Process....................................................... 21
Signs of Effective Nitrogen Reduction ................................... 22
Performance Indicators of Nitrogen Reduction ..................... 22
Troubleshooting Effluent Quality
Troubleshooting Effluent Quality ................................................. 23
Poor Effluent Quality................................................................... 23
Odor............................................................................................. 23
Effluent Filter or Biotube® Filter Clogging .................................. 23
OilyFilm....................................................................................... 23
Foam............................................................................................ 23
Troubleshooting Nitrogen Reduction
Troubleshooting Nitrogen Reduction .......................................... 24
AdvanTex® Treatment Units....................................................12 Notes.....................................................26
Housekeeping.............................................................................14
O&M Binder Appendices
Maintenance Warranty and Materials List.......................................................... A
Record Keeping...........................................................................15 Installation Instructions and
Tools, Equipment, and Spare Parts.............................................15 Field Maintenance Report Form ................................................... B
Routine Inspection and Maintenance....................................15
Repairs....................................................................................15
Personal Hygiene and Cleanup..............................................15
Preventive Maintenance.............................................................16
Scheduled Maintenance.............................................................16
Scheduled Maintenance Reference Chart .............................16
Monthly Maintenance.............................................................17
Submittals and Technical Data Sheets ......................................... C
PumpRepair Manual.................................................................... D
Automatic Distributing Valve Manual and Booklet ....................... E
ControlPanel................................................................................. F
Material Specifications................................................................. G
DesignCriteria............................................................................... H
........................................................................................
9
Copyright Orenco Systems°, Inc, Proper y of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco 800-348-9843 NIN-OW-V4 , Rev. 1, 041;

Primary Tankage
The primary tank is an enclosed, watertight receptacle designed to collect
wastewater; segregate settleable and floatable solids (sludge and scum);
accumulate, consolidate, and store solids; digest organic matter; and
discharge treated effluent.
Scum layer
Clear zone
Sludge layer
In the primary tank, wastewater separates into three distinct layers: a
floating scum layer, a bottom sludge layer, and a clear zone in between,
which is relatively free of large solids. BOD (biochemical oxygen demand)
removals of greater than 65 percent and TSS (total suspended solids)
removals of greater than 70 percent are easily accomplished by the passive
treatment provided in the primary tank. An effluent filter or pump vault
allows liquid effluent from the clear zone to be transported to the next step
in the treatment process.
A typical treatment system with AdvanTex® AX-Max or AX-Mobile
Treatment Units uses one or more Orenco® T-Max'" primary tanks in
parallel or series, depending on the size of the system, to provide passive
primary wastewater treatment. Then the liquid effluent is transported
to the recirculation/blend chamber of the AX-Max or AX-Mobile unit,
either by gravity through an effluent filter or by pump, through a pump
vault. Depending on the system configuration, the primary tank may be
preceded by a grease interceptor tank. For some AX-Mobile applications,
primary tankage is incorporated right into the treatment unit.
Equalization Tankage (if applicable)
Equalization tanks are used in systems with large surge volumes or great
variability in daily, weekly, or monthly flows. Their design and operation are
generally similar to that of primary tanks and they generally contain similar
components as well.
Anoxic Tankage
In some cases, an anoxic (low oxygen) tank may be required for enhanced
denitrification. The anoxic tank enhances the denitrification of AdvanTex®
filtrate. It is sized based on the design flow of the system and can be
located before or after (pre -anoxic or post -anoxic) AdvanTex treatment in
the treatment train.
The anoxic tank provides an ideal environment for carbonaceous microbes
to reduce nitrate to nitrogen gas (denitrification) in the AdvanTex filtrate
returning from the treatment unit. The harmless nitrogen gas is released
freely back into the atmosphere.
Treatment Units
The AdvanTex AX-Max"and AX-Mobile'" Treatment Units are a multiple -
pass, packed -bed, aerobic wastewater treatment technology specifically
designed and engineered for processing of domestic -strength wastewater to
"better than secondary" treatment standards. Typical unit configurations for
AX-Max and AX-Mobile units include a recirc/blend chamber, a recirc/filtrate
chamber, and an AdvanTex textile media filter.
The AdvanTex textile media filter is located above the recirc/blend chamber
and recirc-filtrate chamber. A timer -controlled pump applies blended
effluent from the recirc/blend chamber onto the AdvanTex filter media. The
filtered effluent percolates down through the media and into the recirc/
blend chamber and recircAiltrate chamber. This design reduces the waste
strength applied to the AdvanTex filter by mixing primary -treated effluent
with AdvanTex filtrate.
........................................................................................
9
NIN-OW-Vi -1, Rev. 1, 06/22 Copyright Orenco Systems, Inc. Property of Crenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-348-9843.

The textile media has a large surface area and void volume for free flow of
oxygen. Wastewater percolates both through and between the textile media
A visible biological film normally develops on the filter media within a few
days of the system start-up. Inside the filter, aerobic conditions exist that
are ideal for immediate biological reductions in BOD and TSS. Microbes
for nitrification (the process of converting ammonia to nitrates) also begin
to develop in the filter within four to six weeks, depending on temperature.
Warmer temperatures will help nitrifying bacteria to develop sooner. The
nitrification process will depend on temperature and alkalinity.
After percolating through the media, the filtrate is then distributed into
both the recirc/blend chamber and the recirc/filtrate chamber. As it fills the
recirc/filtrate chamber, the effluent is either allowed to flow back into the
recirc/blend chamber (during low flow conditions) or discharged to tertiary
treatment or final dispersal.
Second -Stage Units
Second -stage AX-Max and AX-Mobile units are used in systems requiring
advanced ammonia removal or polishing after a post -anoxic denitrification
process. Their design and operation are the same as otherAX-Max and
AX-Mobile units.
AX-Max and AX-Mobile Secondary Treatment Unit Components: Typical Configuration
Stand
Qlnl8L, I I— 311UWVI1
Q Recirc-blend chamber
© Tank baffle
Q Recirc-transfer line
© Recirc-pump chamber baffle
V 11-11 L-Pullip 611-11uc1 W -Val ICA Lcnwc Icwa
Q Recirc pumping assemblies ® Recirc-return valve (D Vent fan assembly
Q Distribution manifold ® Recirc-filtrate chamber Q Air inlet
Q Spray nozzles m Discharge pumping assembly (D Air outlet
G Lateral ball valves ® Outlet, discharge G) Hinged lid, typical
.............................*D,,*
..........................................................
9
Copyright Orenco Systems°, Inc, Proper y of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco, 800-348-9843 NIN-ONM-AXM-1, Rev. 1, 041;

Introduction
This section covers the start-up of an AdvanTex® AX-Max or AX-Mobile
Treatment System in a commercial application. The formal start-up of
an AdvanTex Treatment System should only be performed by trained
personnel. As a trained member of the team performing the system
start-up, you play a critical role in the operation of the system. The
decisions made at the time of the start-up will determine the long-term
maintenance needs of the system. Regulators, manufacturers, dealers,
property owners, neighbors, and service providers all rely on a thorough
start-up.
Before you start up the system, please read this entire manual, as well as
the engineering plans, and contact your Dealer if you have any questions.
You'll save yourself time and money, and you'll reduce the potential for
follow-up work. For information specific to your system, refer to your
detailed engineering plans.
We recommend following the flow path through the treatment train,
if possible, when performing the system start-up, beginning at the
building outlets and ending at the final discharge point. By following this
start-up sequence, the treatment train can be effectively inspected for
proper operation and each step in the process can be given systematic
attention.
Roles and Responsibilities
Prior to start-up, the Orenco Representative or AdvanTex Dealer will
contact the Designer, Installer, and Service Provider to coordinate a start-
up date. The date will be based on a status report provided by the Orenco
Representative and the availability of all parties. The status report will
include, but will not be limited to, verification of leak testing performed
by the Installer, installation of all equipment, and the availability of power,
phone line, and water at the site.
• The AdvanTex Dealer is expected to be on site and is either
performing the start-up or acting as a coordinator and general
resource during the installation and start-up of the system.
• The Designer is required at the site during start-up to answer
questions concerning site -specific issues not covered in the plans,
timer settings, and float switch settings.
• The Installer is required at the site during start-up to address any
installation issues that arise.
• The Service Provider is required at the site during start-up to
become familiar with the system, receive training on control panel
and treatment system operation, and to learn correct sampling
techniques for the system.
Safety Precautions
Before starting up, maintaining, or servicing any wastewater treatment
system, observe the following precautions for the safety and health of all
service personnel working with or around wastewater, effluent, and its
associated equipment:
• Wear proper clothing that covers all parts of the body that will be
exposed to wastewater or effluent.
• Wear personal protection equipment (PPE) such as rubber gloves and
eye protection when handling or touching any equipment components
that come in contact with wastewater or effluent.
• Turn off system power at the service entrance panel and set the circuit
breakers in the panel to their "OFF" positions before removing any
system components. Use Lock Out/Tag Out tags to ensure safety.
• Avoid driving over any part of the wastewater treatment system unless
it's been equipped to withstand vehicle traffic. If the system is subject
to possible traffic, put a barricade up to protect the system.
• Take necessary precautions to avoid falling into AX-Max or AX-Mobile
units.
• Do not enter any tank access. Any work performed on the tank should
be done from the outside. Gases and/or oxygen depletion in the tank
can be fatal.
• Properly secure all access lids after all work is complete.
• Practice proper personal hygiene at all times.
Recommended Tools and Equipment:
Start -Up
The following items are recommended for a smooth, successful start-up:
• A tool kit containing common tools and these additional items:
— A cordless power drill with %2-in. nut driver and %2-in. hex -head bit
— Voltmeter
— Small electronics screwdrivers
— Wire strippers/cutters
— Cable ties
— Tape measure
— Adjustable pliers
• A laptop computer with Hyperterminal (PC) or ZTERM (MAC), to
interface with the control panel if the control panel doesn't have a
touch screen.
• A copy of the layout and a start-up checklist for the person
performing the system start-up.
• Appropriate personal protection equipment (PPE) for each person
involved in the start-up.
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NIN-OW-Vi -1, Rev. 1, 06/22 Copyright 0renco Systems, Inc. Property of Crenco Systems, Inc. Do not reproduce or distribute without written authorization from 0renco: 800-3W9843.

Pre -Start -Up Inspection Points
• System layout: Verify that the component layout in the plans or
the system diagram matches the installed system and note any
differences between the plans and the installed system.
• Site drainage: Verify that all riser lids, external splice box lids, and
treatment unit lids are level and above grade. Verify that the soil
slopes away from all lids for good drainage.
• Serviceability: Verity that there is sufficient space between
treatment units to fully open the lids on the treatment units. Check
for a useable water source within hose distance of the system.
Control Panels
The system may have multiple control panels. For AX-Mobile Treatment
Units, control panels are typically built into the treatment unit. Identify if
there are control panels on the section of the system that you are about to
start up and perform the following start-up steps:
1. Panel documentation: Locate the panel -wiring diagram inside
the panel and verify the document matches the document number
found on the inside of the front panel door. If you can't find the wiring
• Landscaping: Check for landscape features that may cause
maintenance issues:
— Trees planted near tanks or on top of tanks
— Trees that could shed snow onto critical components, such as
control panels
— Risers, external splice boxes, and components covered in bark or
other landscaping materials
• Circuit breakers:
Open the control
panel and make sure
that all of the circuit
breakers are switched
to "Off."
• System access:
Remove lid bolts and
open all lids.
• AX-Max or
AX-Mobile: Verify
that all of the shipping
materials are removed from the treatment units. If not, remove them
at this time. Verify that the lateral inlet valves in the pods are open
and the spray nozzle turbines are pointed up.
diagram, contact Orenco at [phone] or [phone] to
have a copy e-mailed or faxed to you.
2. Wiring installation:
Verify all of the main
breakers are in the
"OFF" position. Inspect
the wire terminations
in the panel by giving
a light tug to all of the
float switch wires, pump wires, pump power lines, and main power
lines in the panel. If a wire comes loose, reattach the wire correctly.
WARNING: Loose Wres can cause intermittent failures,
inconsistent panel operation, and over -current conditions on pumps.
3. Conduit seal installation: Check for conduit seals on all conduit
connections to the control panel.
WARNING: Failing to seal the conduit may allow corrosive gasses to
corrode major components. Orenco recommends conduit seals for all
connections to the control panel to assure proper system operation
and componentlongevd}.
........................................................................................
Copyright Orenco Systems-, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-* 8-9843. NIN-ONM-AXM-1, Rev. 1, 04/;9

4. Power supply voltage: Make sure the panel breakers are switched
off, and check the power supply voltage at the panel.
• On 120 V panels, measure voltage between L1 and neutral. The
voltage should be within ten percent of nominal.
• On 230 V panels, measure the voltage between L1 and neutral,
and between L2 and neutral. The voltage of each leg should be
approximately 115 volts. Measure the voltage between L1 and L2.
The voltage should be within ten percent of nominal.
• On 208 V, 230 V, and 460 V 3-phase panels, measure the voltage
between L1 & L2, L2 & L3, and L3 & L1. The voltage between
each leg should be 208, 230 or 460 volts, respectively. If there
is a voltage difference between line legs, it is an indication that
the power source may be undersized. The voltage between each
leg and ground on 208 volts should be approximately 120 volts.
The voltage between each leg and ground on 460 volts should be
approximately 277 volts. (Due to the variability in the ways 230 V,
3-phase power can be wired, there is not a standard test method.)
5. Neutral and ground voltage: Check for any voltage difference
between each neutral (N) wire in the panel and ground. If there is a
difference in voltage, use the wiring diagram to track down the source
of the difference and correct it.
6. Controls circuit: Connect the controls circuit if it is not already
connected. The controls circuit is now ready to be turned on. Do not
turn on the pump circuit at this time.
WARNING: Tuming the pump circuit on at this time can damage the
panel or the pump if the pumps and floats are miswired or if there
isn't sufficient liquid in the tank.
7. Panel operation: Verify that the panel is powered up.
• On TCOM panels, an LED will light up indicating the board is
operational. If the blinking light does not turn on, refer to the wiring
diagram and verify the connections on the control circuit were
properly terminated.
On MVP, Simplex, and Duplex panels, turn on the control circuit,
then toggle the pump "AUTO -OFF -MAN" switch to "MAN." The
motor contactor will visibly and audibly engage at this point. If the
motor contactor does not engage and there are no alarm conditions,
refer to the wiring diagram and verify the connections on the control
circuit were properly terminated.
Primary Tanks
The ability to easily remove filters and float switch assemblies from primary
tanks is essential. Check the system plans to identify any associated
components, such as splice boxes, float switches, filters, or pump vaults.
Primary tanks may not have associated components as described below.
Place system components on a plastic tarp or sheeting when they are out of
the tank. Record inspection results on the Field Maintenance Report Form.
1. Tanks: Confirm with the installer that all tanks have antibuoyancy
measures installed (if necessary) and that they have passed
watertightness testing. Verify that the inlet and outlet of the tank and
riser(s) are properly installed.
2. Risers: Inspect riser attachments and rubber grommets for a
watertight seal.
3. Splice boxes: Inspect all
splice boxes for correct
wiring and the use of
waterproof splice nuts. If
there is water in a splice
box, use a suction bulb or
sponge to remove the water.
WARNING: Failure to use
waterproof wire nuts can cause intermittent or permanent float
switch failure.
4. Float switch assemblies: If the tank is equipped with a float switch
assembly, verify that it is easy to remove for service and maintenance.
Also verify the float switch settings.
a. Detach the float switch
assembly from the
bracket on the effluent
filter or pump vault,
remove it from the tank,
and lay it aside. Verify
there is enough slack in
the cord for easy removal.
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NIN-OW-Vi -1, Rev. 1, 06/22 Copyright Crenco Systems, Inc. Property of Crenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-3W9843.

b. Raise the high-level alarm float switch to simulate a high-level
condition. Verify that the high-level signal is on by the audible alarm
or the high-level alarm input LED on the circuit board in the panel.
NOTE: The audible alarm is delayed for hours in TCOM control
panels.
c. When the assembly is out of the tank, verify the handle is long
enough for easy access. If not, adjust it to the necessary length.
d. Check the float switch settings provided in the plans against the
actual float switch settings. If the plans don't provide float switch
settings and the engineer or system designer is unable to provide
settings, set the float switches based on the following general
float switch setting rules:
• Demand Dose:
— "Redundant Off" (RO)
float switch is set 3
inches (76 mm) above
filter cartridge or
minimum liquid level of
the pump, whichever is
higher.
— "Pump Off" float switch
is set 3 inches (50 mm)
above "RO" float switch
or for a minimum
30-second drawdown
differential between the
"Pump Off" float switch
and "RO" float switch.
— To calculate distance
between "Pump On"
and "Pump Off" float
switches, divide desired
dose volume by the
—
— — —
Invert of
tank inlet
2
(50 ram)
High Level/Lag
1
pump Enable
Calculate
T
distance
1
Pump On
Calculate
distance
®
Pump Off
T
3" (76 mm)
or30-second
drawdown
®
RO
T
3"
(76 mm)
Filter cartridge
1
or minimum
liquid level
gallons per inch (or liters per mm) of the tank. Place the
"Pump On" float switch that many inches (or mm) above the
"Pump Off" float switch.
— "High Level" or "High Level/Lag Pump Enable" float switch is
set at 2 inches (50 mm) below invert of tank inlet.
WARNING: Pumps have a 30-second minimum run time. If the drawdown
differential between the `Pump Off "float switch and "RO" float switch is less
Men 30 seconds, the pumps may continue to run, resulting in a false low-
level alarm.
• Timed Dose:
— "RO" float switch is set
3 inches (76 mm) above
the filter cartridge.
— "Timer On/Off" float
switch is set 3 inches
(50 mm) above the "RO"
float switch.
— "Override Timer" float
switch is set 3 inches
(76 mm) below the
"High Level" float switch
switch.
— "High Level" or "High
Level/Lag Pump
Enable" float switch is
set at 2 inches (50 mm)
below the invert of the
tank inlet.
NOTE: If you use the
general floats witch
— — —
— Invert of
tank inlet
2"
50 mm
1
High Level
T
3"
76 mm
Override Timer
Timer On/Off
T
3"
76 mm
RO
3'
76 ram
Filter cartridge
1
or minimum
liquid level
Float Configuation,
Timed Dose
setting rules, you may need to return at a later time after the
system is in operation and adjust float switch settings.
e. Leave the float switch assembly out of the tank for use during
pump run testing.
5. Effluent filters: If the tank is equipped with an effluent filter, verify
that the filter cartridge is easy to remove for service and maintenance.
a. Pull the effluent filter cartridge out of the housing and remove it
from the tank. There should be ample clearance to allow easy
removal of the cartridge from the housing and tank.
b. When the cartridge is out of the tank, verify that the handle is long
enough for easy access. If not, adjust it to the necessary length.
c. Reinstall the cartridge into the effluent filter housing.
........................................................................................
Copyright Orenco Systems-, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-348-443. NIN-0W-V -1, Rev. 1, 06/22

6. Biotube® pump vault filter: If the tank is equipped with a Biotube
pump vault filter, verify the pump vault filter cartridge is easy to
remove for service and maintenance.
a. Pull the filter cartridge out of
the pump vault and remove it
from the tank. There should
be ample clearance to allow
easy removal of the cartridge
from the pump vault and tank.
b. When the cartridge is out of
the tank, verify that the handle
is long enough for easy
access. If not, adjust it to the necessary length.
f. Reinstall the cartridge in the pump vault.
7. Effluent pump access: If the primary tank is equipped with an
effluent pump, verify that the pump is easy to remove for service and
maintenance and that the pump flow rate and voltage are correct.
a. Verify that the ball valve and cam -lock fitting or union on the
discharge assembly is within 24 in. (610 mm) of the top of the
tank riser.
b. Close the ball valve on the discharge assembly if there is one
and disconnect the discharge assembly at the cam -lock fitting or
union.
c. Verify that there is enough slack in the pump cord for easy
removal.
d. Pull the pump out of the vault
by the discharge assembly
and remove the pump from
the tank.
WARNING: Lifting or
lowering the pump by the
cord can damage the pump
and cord.
e. Check the voltage and
phase values on the pump nameplate. Write them down in the
start-up report. If there are pump motor stickers on the inside
of the control panel door, check to see if they match the pump
nameplate.
WARNING: If the pump does not match the panel voltage and
phase requirements, do not turn on the pump breakers!
f. Reinstall the pump if the pump matches the panel voltage and
phase requirements.
g. Reconnect the discharge assembly at the union or cam -lock fitting
and open the discharge assembly ball valve.
Equalization Tanks
The ability to easily remove filters and float switch assemblies from
equalization tanks is essential. Equalization tanks typically contain
components similar to primary tanks. Check the system plans to identify
any associated components, such as splice boxes, float switches, filters,
or pump vaults and follow the steps listed for these components from
the section on start-up and inspection points for primary tanks. Record
inspection results on the Field Maintenance ReportForm.
Pump Operation for Primary and
Equalization Tanks
After the necessary control panels are inspected and powered up, the float
switch inputs have been tested, and all pump voltage and phase information
has been verified, primary tank pump(s) and equalization tank pump(s) can
be powered up and tested. Record all necessary information on the Field
Maintenance Report Form.
1. Manual pump operation:
a. Turn the effluent pump
breaker(s) in the control panel
to the "ON" position.
b. Measure the static voltage
of the pump(s) and enter
the value(s) on the start-up
checklist.
c. Toggle the pump "AUTO -OFF -
MAN" switch to "MAN." The
motor contactor will visibly
and audibly engage at this
point. If the motor contactor
does not engage, check for an
"RO" alarm condition. If there
is no alarm condition, refer to the wiring diagram and verify that the
connections on the control circuit were properly terminated.
WARNING: There is no motor protection in TCOM panels and
panels without RO"alarms . Before running a pump, always verify
that there is sufficient liquid in the tank.
d. Check the discharge plumbing assembly (DPA) for vibration to verify
the pump motor is operating.
— No vibration in the DPA indicates a pump wiring issue. Check the
pump voltage and pump wiring terminations in the panel and in the
splice box. Wires may be incorrectly terminated or wire insulation
may be causing faulty contact between the wire and terminal lug.
— Vibration in the DPA with low or no flow from the pump
indicates closed valves or line breakages. On duplex pumping
systems where two DPAs are plumbed together in a single
........................................................................................
NIN-OW-AXM-7, Rev. 7, O6/22 Copyright Orenco Systems, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-3W9843.

line, verify that the check valves on both pumps are operating
correctly. On three-phase systems, verify L1, L2 and L3 are
wired correctly. A quick way to identify correct pump wiring
is to watch for clockwise torsion in the discharge plumbing
assembly when the pump is first turned on.
e. Measure the voltage across the pump when it is runnin
and measure the voltage across the pump when it is static.
Compare the two measurements.
Voltage drops indicate connection problems in the splice box or
wiring that is too small for the pump.
Pump Amperage Chart
Pump Model
Low Amp Reading
High Amp Reading
PF100511
11.9
12.6
PF100512
6.0
6.4
P F10053200
3.5
3.9
PF100552
3.6
3.8
PF100712
7.8
8.4
PF10073200
4.9
5.2
PF100752
5.8
6.2
P F101012
9.0
9.8
PF10103200
5.1
5.6
P F101552
9.4
11.4
PF102012
10.0
12.2
PF102032
6.4
7.6
P F10203200
7.5
8.7
P F200511
11.0
12.5
PF200512
5.8
6.5
PF200532
2.5
2.9
P F20053200
3.3
3.8
P F201012
9.6
10.5
PF300511
10.7
11.8
P F20103200
5.0
5.9
PF20153200
6.0
7.2
P F201512
10.5
12.6
P F300512
5.6
6.2
PF30053200
3.3
3.7
P F300552
3.5
4.2
P F300712
7.4
8.6
PF300752
5.5
6.1
P F30073200
4.1
4.9
PF301012
9.3
10.4
PF301052
6.4
7.4
P F30103200
4.9
5.8
P F301512
10.1
12.6
P F30153200
5.5
6.9
P F301534
2.3
2.8
P F301552
8.1
9.3
P F302012
7.4
11.0
P F30203200
7.7
9.3
P F303012
12.6
16.8
P F303032
8.2
10.1
PF305012
20.1
25.8
P F305032
14.0
16.6
f. Use an ammeter to measure the pump amperage. Make
sure the amperage is within the range specified in the pump
amperage chart below or listed on the pump nameplate. For
non-Orenco pumps, consult the manufacturer's literature.
NOTE: On TCOM panels with a current sensor option, pump
amperage should match the value listed in the panel. If it does
not match, inspect the three -position switch on the current
sensor for the correct scaling factor.
g. Set the high and low amperage ranges based on the reading.
Pump Model
Low Amp Reading
High Amp Reading
P F30503200
15.4
18.6
P F500511
10.5
12.1
PF500512
5.4
6.2
PF500532
2.6
3.0
PF50053200
3.2
3.7
PF500534
1.3
1.5
P F500552
3.3
3.9
P F500712
7.3
8.5
P F500732
3.1
3.9
P F50073200
3.9
4.9
P F500734
1.4
1.8
PF501012
8.8
10.1
P F50103200
4.6
5.7
P F501034
1.8
2.2
PF501512
9.6
12.6
P F50153200
5.4
7.0
P F501552
8.0
9.1
P F503012
12.6
17.7
P F503032
8
10.4
P F50303200
10.1
13.1
PF503034
4.2
5.3
PF505012
17.3
26.4
P F505032
13.1
16.5
P F751512
11.4
12.3
P200511
12.6
13.8
P200512
6.1
7.1
P201512
11.2
12.2
P300512
5.8
6.5
P300712
7.4
8.3
P301012
9.1
10.3
P500511
11.2
12.7
P500512
5.8
6.5
P50053200
3.4
3.8
P500712
7.7
8.8
P50073200
3.8
4.8
P501012
9.4
11.2
P501512
10.6
13.1
P50153200
6.0
7.6
PEF3311
6.9
7.8
........................................................................................
Copyright Orenoo Systems°, Inc, Proper y of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco, 800-348-9843 NIN-ONM-AXM-1, Rev. 1, 00/22

2. Automatic pump operation: Test the system by using the float
switches to drive pump operation.
• Demand dose:
a. Toggle the "AUTO -OFF -MAN" switch to the "AUTO" position.
b. Unclip the float switch assembly and remove it from the tank if
it is not out already.
c. Verify the automatic operation of the pumps by incrementally
lifting the float switches to simulate normal raising and lowering
of the tank liquid level. The pumps should cycle on when you lift
them and cycle off when you release them. On duplex systems,
the pumps should alternate between lead and lag pumps and
cycle off when the float switches are dropped.
NOTE: An "On/On" float switch works differently than a pair of
"On "and "Off" float switches. Verify the type of float switches in
your system before testing.
d. Lower the float switch assembly into the tank and clip the float
switch assembly into the float bracket.
• Timed dose:
a. Toggle the "AUTO -OFF -MAN" switch to the "AUTO" position.
b. Record the timer settings, then reduce the timer settings to 0.5
minutes "OFF," 0.5 minutes "ON," and 1.0 minutes "OVR OFF."
c. Let the pump run through several cycles to confirm that the
timers are operating correctly.
d. Change the timer settings back to the settings specified by the
engineer.
3. Drawdown test: Perform a drawdown test to set the pump flow
rate in the control panel.
a. Measure and record the distance from the top of the tank to the
liquid level in the tank.
b. Toggle the pump "AUTO -OFF -MAN" switch to the "MAN" position
for sixty seconds.
c. Toggle the pump "AUTO -OFF -MAN" switch to the "OFF' position;
then measure and compare the difference in elevations. The
difference in elevation in inches or millimeters, multiplied by the
gallons per inch or liters per millimeter of the tank, will provide the
correct flow rate in gallons per minute (gpm) or liters per minute
(L/min). Follow the instructions provided with the control panel for
entering the measured pump flow rate.
Tank Timer Settings
1. Timer settings: The timer settings for the system are calculated
based on the actual and expected flow. Equations are provided below.
a. Identify Dose Volume
• Dose Volume = Number of gallons desired per dose
or
• Dose Volume = (Number of Orifices) x (Loading Rate per Orifice)
b. Identify Doses per Day
• Number of Doses per Day = (Design Flow) - (Dose Volume)
c. Identify Time Interval Between Starts
• Time Interval Between Starts = (Hours per Day) - (Doses per Day)
d. Identify Time On
• Time On = (Dose Volume) - (Measured Pump gpm)
AdvanTee Treatment Units
Before placing treatment AX-Max orAX-Mobile Treatment Units in service,
make sure that they are functioning properly. Record all necessary
information on the Field Maintenance ReportForm.
1. Initial inspection: Inspect the points below to begin the start-up
process for treatment units.
• Check that the treatment unit is level.
• Check that all plumbing and venting connections to and from the
treatment unit are connected and secure.
• For AX-Max treatment units installed in -ground, confirm with the
installer that the treatment unit has antibuoyancy measures installed
(if necessary).
• For AX-Max treatment units
installed in -ground, check that
the treatment unit is installed
with the top at least 6 inches
(150 mm) and no more than
36 inches (915 mm) above
final grade. Check that the
final grade slopes away from
the unit.
6-in. (150 mm) minimum
clearance above grade
• Check that all of the laterals are turned so the spray nozzle turbines
are pointed up, the outlet valves on the ends of the laterals are
open, and the manifold valve is open, to prevent fouling of the spin
nozzles during operational testing of the of the recirc pumps.
• Check that the treatment unit is free of loose items and debris.
........................................................................................
NIN-OW-Vi -1, Rev. 1, 06/22 Copyright 0renco Systems, Inc. Property of Crenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-3W9843.

2. Manual pump operation:
WARNING: Before testing the pumps in the treatment unit, the
unit must be partially filled with water to avoid pump damage.
a. Make sure the recirc/blend
pump circuit breakers —
located in the treatment unit
control panel — are in the
"ON" position. If the unit is
equipped with recirc/filtrate
pumps, make sure the unit's
recirc/filtrate pump circuit
breakers are in the "ON"
position.
b. Measure the static voltage of the pump(s) and enter the value(s)
on the start-up checklist.
C.
Toggle each of the recirc/
blend pump "AUTO -OFF -
MAN" switches and recirc/
filtrate pump "AUTO -OFF -
MAN" switches to "MAN."
The motor contactors should
audibly engage at this point.
If any of the motor contactors
does not engage, check for an
"RO" alarm condition. If there
is no alarm condition, refer to the wiring diagram and verify the
connections on the control circuit were properly terminated.
WARNING: There is no motor protection in TCOM panels and
panels without RO"alarms . Before running a pump, always verify
that there is sufficient liquid in the tank or basin.
d. Verify the operation of the recirc/blend and recirc/filtrate pump
motors by checking for vibration from the DPAs on each of the
pumps.
— No vibration in the DPA indicates a pump wiring issue. Check
the pump voltage and pump wiring terminations in the panel and
in the splice box. Wires may be incorrectly terminated or wire
insulation may be causing faulty contact between the wire and
terminal lug.
— Vibration in the DPA with low or no flow from the pump indicates
closed valves or line breakages. On three-phase systems, verify
L1, L2, and L3 are wired correctly. A quick way to identify if the
pump is wired correctly is to watch for clockwise torsion in the
discharge plumbing assembly when the pump is first turned on.
e. Measure and compare the dynamic voltage of the pumps to
the measured static voltage. Voltage drops indicate connection
problems in the splice box or wiring that is too small for the pump.
f. Use an ammeter to measure the pump amperage. Make sure the
amperage is within the range specified in the pump amperage
chart on page 11 or listed on the pump nameplate.
NOTE: On TCOM panels with a current sensor option, pump
amperage should match the value listed in the panel. If it does not
match, inspect the three -position switch on the current sensor for
the correct scaling factor.
g. Set the high and low amperage ranges based on the reading.
3. Manifold pressure and nozzle spray patterns: Before testing the
automatic function of the pumps, set the manifold pressure and check
the spray pattens of the spin nozzles for sufficient treatment media
coverage.
a. Close the outlet valves on the ends of the laterals. Turn all laterals
so the spray nozzle turbines are pointed down.
b. Make sure the pressure in the
pressure gauges is equalized
by opening and closing the
port at the top of the pressure
gauge and then toggle the
recirc/blend pump "AUTO -
OFF -MAN" switches in the
control panel to "MAN."
c. Use the gate valve on the
manifold to pressurize the
manifold and laterals to 3.0-
3.5 psi (20.7-24.1 kPa).
d. Check the nozzles for square spray patterns to the edge of the
splash guards, but not over them; use the gate valve to adjust the
manifold pressure for good spray patterns. Record the adjusted
manifold pressure settings in the Field Maintenance Report Form.
e. Toggle the recirc/blend pump switches to "OFF" when finished.
........................................................................................
Copyright Orenco Systems-, Inc. Property of O4co Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-* 8-44 . NIN-ONM-AXM-1, Rev. 1, 04/;

4. Automatic pump operation: Test the recirc/blend pumps and
recirc/filtrate pumps Of equipped) using the float switches to drive
pump operation.
• Demand dose (recirc/filtrate pumps):
a. Toggle the "AUTO -OFF -
MAN" switch to the "AUTO"
position.
b. Unclip the float switch
assembly and remove it from
the vault or flow inducer.
c. Verify the automatic operation of the pumps by incrementally
lifting the float switches to simulate normal raising and lowering
of the chambers' liquid levels. The pumps should cycle on when
you lift them and cycle off when you release them. On duplex
systems, the pumps should alternate between lead and lag
pumps and cycle off when the float switches are dropped.
NOTE: An "On/Off" float switch works differently than a pair of
"On "and "Off" float switches. Verify the type of float switches in
your system before testing.
d. Lower the float switch assembly into the vault or flow inducer
and clip the float switch assembly into the float bracket.
• Timed dose (all recirc/blend pumps and recirc/filtrate pumps with
timed dosin :
a. Toggle the "AUTO -OFF -MAN" switch to the "AUTO" position.
b. Record the timer settings; then reduce the timer settings to 0.5
minutes "OFF," 0.5 minutes "ON," and 1.0 minutes "OVR OFF."
c. Let the pump run through several cycles to confirm that the
timers are operating correctly.
d. Change the timer settings back to the settings specified by the
engineer.
5. Recirc timer settings: The method for calculating timer settings
for the recirc/blend chamber timer settings is provided below. TCOM
panels have the ability to adjust the timer setting based on actual flow
data. See the instructions included with the control panel for setting
information.
• Pump On Time =1.5 Minutes
• Pump Off Time = (1440 - Cycles per Day) - Pump On Time
NOTE: The standard "Pump On Time" for AX-MAXand
AX-Mobile treatment units is 1.5 minutes. Your systems needs
may differ. Consult your site plans, engineer/designer, or Orenco
for more details.
Cycles per Day = [Flow x (Recirc. Ratio + 1)] = (Pump Flow Rate x
Pumps per Dose x Pump On Time)
6. Vent Assembly: A current sensor monitors the vent fan operation. If
the fan fails, this sensor will open and activate an alarm. To test the
current sensor, switch off the power to the fan and verify the visual
alarm on the control panel is activated.
NOTE: TCOM control panels have a 12-hour delay in the audible
alarm for the current sensor.
Housekeeping
1. Verify that all control panels are turned on and all "AUTO -OFF -MAN"
switches are toggled to "AUTO."
2. Close and secure all control panels.
3. Close and bolt down all tank access lids and riser lids.
WARNING: AN OPEN TANK ISA SAFETY HAZARD! Therefore a
damaged riser or lid oran unbolted lid is a safety hazard. TANKLIDS
AND RISER ACCESS LIDS MUST BE PROPERLYSECUREDATALL
TIMES If a lid or riser becomes damaged or if lid bolts are lost or
damaged, BLOCKACCESS TO THE TANK OPENING and repair the
damage immediately. If you need replacement bolts, contact Orenco
immediately for replacements.
4. Police the area for debris and tools.
5. Make sure that all start-up forms and checklists are complete and
provide copies to the necessary parties.
........................................................................................
NIN-OW-Vi -1, Rev. 1, 06/22 Copyright Orenco Systems-, Inc. Property of Crenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-3W9843.

Record Keeping
Maintain a written diary
describing all activities relating
to the AdvanTex system. This
information is very valuable for
analysis and troubleshooting if
problems should occur.
Tools, Equipment, and Spare Parts
Many maintenance and troubleshooting procedures require specialized
tools, equipment, and spare parts. We recommend that you keep the
following items on hand:
Routine Inspection and Maintenance
• Ammeter
• Biotube° filter cradle (OM-BIOTUBECRADLE)
• Calculator
• Channel lock pliers
• Cordless driver
• Digital camera
• Dissolved oxygen (DO) meter or colorimetric ampoules
• 1/2" and 3/16" hex head drill bit
• Extension cord
• Extra lid bolts
• Laptop with null modem cable (fCOM only)
• Hook for raising float switches to test them
• Hose with sprayer
• pH meter or pH test strips
• Sample beakers or bottles
• Sludge and scum measuring device (e.g. Nasco Sludge Judge° for
sludge and Orenco SMUG for scum)
• Spare pressure gauge
• Tape measure
• Telephone for testing dial tone (fCOM only)
• Test strips for nitrate, ammonia, alkalinity
• Turbidity meter
• Voltmeter
• Watch or stopwatch
Repairs
• Adhesive
• Backf low prevention device
• Extension cord
• Flashlight with spare batteries/bulb
• Float switches (spares)
• Hacksaw with spare blades
• Hammer
• Hand tools
• Heat gun (torch)
• Hole saw (vari-bits: 3/4" and 1-3/8")
• Hose with nozzle
• Inspection mirror (e.g. PrototekTm "Mirror on a Stick")
• Plumber's snake
• Pumps (spares)
• PVC cement and primer
• PVC fittings
• PVC pipe
• Screwdriver set
• Shovel Snake (building sewer)
• Spare parts for downstream components
• Waterproof wire nuts
• Wire stripping/crimping tool (10 to 22 AWG)
• Wrench (24-inch or 600-mm pipe wrench)
• Wrench (lid bolt)
Personal Hygiene and Cleanup
• Bleach/water solution
• Eye protection
• Hand cleanser
• Paper towels
• Protective clothing
• Rags
• Rubber gloves
........................................................................................
Copyright Orenoo Systems°, Inc, Proper y of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco, 800-348-9843 NIN-ONM-AXM-1, Rev. 1, 06/22

Preventive Maintenance
As with any engineered system, such as a car or heat pump, your
wastewater treatment system will work better and last longer if it is
regularly maintained by a qualified service provider. The service provider
should be present during installation, so he or she is familiar with the
system, especially those service lines, conduits, and connections that get
buried.
Your system will work better and last longer if you learn what not to put into
the treatment system. There should be no disposal of toxics or chemicals
into the system, such as restaurant degreasers, cleansers, wax strippers
for linoleum, carpet shampoo and its waste products, and other toxics. As a
general rule, nothing should go into any wastewater treatment system that
hasn't been ingested, other than toilet tissue, mild detergents, and wash
water. Every system user and qualified service provider should be familiar
with the basic guidelines below:
• No septic additives
• No flammable or toxic products
• No excessive household cleaners
• No chlorine bleach, chlorides, and pool or spa products
• No pesticides, herbicides, or agricultural chemicals or fertilizers
• No RV waste (unless the system is specifically designed and
engineered to treat such waste)
• No water softener backwash
• No surface runoff or stormwater runoff
• No excessive amounts of fats, oils and grease (FOG)
• No food byproducts
• No cigarette butts
• No paper towels, newspapers, sanitary napkins, diapers, disposable
wipes, floss, gum or candy wrappers, etc.
Preventive maintenance should start with facility user and/or homeowner
education. Orenco Systems®, Inc. can provide a manual of Do's and Don'ts
to distribute upon request. To request multiple copies of this manual,
contact Orenco Systems, Inc. at [phone] or ([phone].
With preventive maintenance and periodic inspections, the wastewater
treatment system will function for decades.
Scheduled Maintenance
We recommend that scheduled maintenance be performed in the time
frames provided as a guideline in this section. A chart showing suggested
scheduled maintenance activities and times is included below, for your
convenience. However, system discharge limits and influent loads dictate
actual 0&M requirements. Consult Orenco, your system's engineer, and
your regulatory permit for information on your system's specific O&M
requirements.
Scheduled Maintenance Reference Chart
-11111V • - • A - • •
ks AA
Visually Inspect Tank Liquid Levels
01
•
Check Biotube® Effluent Filters; Clean as Required
61
•
•
Check Biotube® Pump Vault Fitters; Clean as Required
61
•
•
Record Elapsed Time Meters and Event Counters for All Pumps
•
Inspect Spin Nozzles, Clean as Required
•Z
•
Confirm Proper Operation of Automatic Distributing Valve (if applicable)
•
Sample Influent and Effluent Quality Parameters'
61
•
Confirm and Record Pump Voltages and Amperages
61
•
Inspect Distribution of Effluent in AX-Max Units; Clean as Required
•
Record Scum and Sludge Accumulation in Tanks
•
Flush Distribution Laterals in AX-Max Units
•
Inspect Pumping System Components; Clean as Required
•
Replace Lithium Battery in TCOM Control Panel (if applicable)
•
' This maintenance schedule is only required during the first year of system operation.
2 This maintenance schedule is only required during the first quarter of system operation.
3 Recommended guidelines only. Sampling should be scheduled according to regulatory requirements.
........................................................................................
0
NIN-OW-Vi -1, Rev. 1, 06/22 Copyright Orenco Systems®, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-348-9843.

Monthly Maintenance
1. Visually Inspect Tankage and Treatment: Once a month, during the
first year of operation, make a visual inspection of the liquid levels in
the primary tank, recirc-blend chamber, and recirc-filtrate chamber.
The liquid level should never be lower than the "Redundant Off" float.
If liquid leaks out of the tank or treatment unit, the scum layer can
drop to the level of the perimeter holes in the pump vaults and cause
the screen to plug. A watertight tank is important and any leakage
must be corrected.
2. Check the Biotube® Filter or
Effluent Filter: Check the filters in
the tanks every month during the
first year of operation, and clean
the filter when it is necessary. For
Biotube filter cleaning instructions,
see 0&M Binder Appendix B.
3. Check the Pump Vault; Once
a month, during the first year of operation, the Biotube Pump Vaults
should be examined to determine if cleaning of the Biotube filter is
necessary. If the liquid level inside a pump vault is discernibly different
from the level outside the pump vault while the pump is running,
cleaning is required. Remove the filter cartridge and clean it.
3. Inspect the Spray Nozzles:
Once a month, during the first
quarter of operation, inspect the
spray nozzles in the treatment
units. Observe and measure
the manifold pressure. Manifold
pressure values should be
between 3.0-3.5 psi (20.7-24.1
kPa). If the manifold pressure exceeds 3.5 psi (24.1 kPa), it is likely
that the manifold and laterals require flushing or the spray nozzles are
plugged. To flush the manifold and laterals, follow the instructions from
the "Start -Up and Inspection" section of this manual.
io clean out the spray nozzles,
turn the laterals so the spray
nozzle turbines are pointed up
and then hose off each turbine.
For excessive buildup in the
spray nozzles, remove the
nozzles and replace them with
clean nozzles Disassemble and
• After flushing and cleaning, recheck the manifold pressure. If the
manifold pressure still exceeds 3.5 psi (24.1 kPa), try either a
bottle brush attached to the end of a plumber's snake or a high-
pressure washer to clean the manifold.
4. Read Hour Meters and Event Counters: Once a month, read the
hour meters and event counters for the recirc-blend and recirc-filtrate
chamber's pumps. Each pump should run approximately the same
number of hours and turn on approximately the same number of times
as their operating counterpart. If the run times or cycle times differ
significantly between pumps, determine the cause of the discrepancy
and take corrective measures. For units equipped with TCOM, this
information can be found on the TCOM control panel.
Quarterly Maintenance
Testing for Carbonaceous Biochemical
Oxygen Demand (cBOD0; Total
Suspended Solids (fSS); Fats, Oils,
and Grease (FOG); Ammonia (NH3);
Nitrate (N0); and pH should be done
according to regulatory requirements.
Take and Test Influent and
Effluent Samples: If the regulatory jurisdiction doesn't require
treatment system influent and effluent testing, samples should be
taken quarterly for the first year to establish a baseline. Subsequent
testing after the first year may be reduced based on the establishment
of this baseline. Regular samples will provide valuable information for
ongoing maintenance and troubleshooting. All results obtained should
be reported to the appropriate people, including Orenco.
2. Check Pump Voltages and Amperages: For the first year only, check
voltages and amperages of all pumps during quarterly inspections and
record them on the Field Maintenance Report Form. Refer to the start-
up voltages and amperages recorded in the "Start-up & Operation"
section of this document. If the voltage drop or amperage exceeds
National Electric Code (NEC) requirements or the limits set by your
regulatory jurisdiction, have an electrician verify the service line and
check the pump windings. This procedure can be performed annually
after the first year, if there is no discernible difference in voltage or
amperage during the first year of checking.
Semi -Annual Maintenance
1. Inspect the Spray Nozzles: Inspect the spray nozzles in the
Treatment Units as directed in the monthly maintenance section and
perform maintenance as needed.
soak the plugged nozzles in TSP • If the nozzles are substantially plugged after six months, then it's
or any other appropriate cleaning agent for 30 minutes. When a recommended that you begin inspecting the manifold pressure
spray nozzle is clear, you can see the spray nozzle turbine spin freely every three months (or sooner) and adjust scheduled testing and
and the spray distribute evenly across the textile media. flushing of the manifold accordingly.
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Copyright Orenco Systems®, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-348-443. NIN-OW-V -1, Rev. 1, 04/;

Annual Maintenance
Once a year, send copies of the complete activity diary to the appropriate
person. This information is very valuable for analysis and troubleshooting if
problems occur.
Measure the scum and sludge accumulation in all tanks and chambers
annually. Record scum and sludge measurements on a Field Maintenance
Report Form.
Measure the scum layer: Use a scum utility measuring gauge
or similar tool to measure the thickness of the scum layer. With this
measurement, determine if the distance from the bottom of the scum
layer at the liquid's lowest normal level to the bottom of the outlet
tee or to the top of the inlet holes for the pump vault is 3 in. (76 mm)
or less. If so, pump out the contents completely. After removing the
septage contents, refill with water to the normal operating level.
2. Measure the sludge layer: Use a Sludge Judge® or similar tool to
measure the thickness of the sludge layer. With this measurement,
determine if the distance from the top surface of the sludge to the
bottom of the outlet tee or inlet holes for the pump vault (PVU) is 6
inches (152 mm) or less. If so, completely pump out the contents. If the
tank is fitted with a pump vault or effluent filter discharge assembly,
take the measurement from the top surface of the sludge layer to the
bottom of the vault's inlet ports. After removing septage, refill it with
water to its normal operating level.
3. Check the Pump Voltages and Amperages: Check the voltages
and amperages of all pumps and record them on a Field Maintenance
Report Form. Compare them to the start-up voltages and amperages
provided in the "Start-up and Inspection" section of this document. If
the voltage drop or amperage exceeds NEC requirements, have an
electrician verify the service line and check pump windings.
4. Inspect the Pumping System: Inspect the pumping system annually
to ensure it is operating properly. Unscrew the stainless steel bolts that
fasten the fiberglass lid over the pumping equipment. Remove the
fiberglass lid for an inspection that includes these steps:
a. Verify there are no obvious holes or leaks in the riser or around
the perimeter of the riser connection to the tank. Wetness or
watermarks may be an indication of weeping.
b. Inspect the splice box to ensure it is free of water. Ensure the lid and
connections are secure.
c. Verify the floats are in good condition and properly secured to the
float tree. Verify the float cords are neatly wrapped inside the riser
so that they cannot interfere with the operation of the floats.
d. Verify float operation. Refer to the float tests in the "Start-up &
Operation" section of this document.
Biennial Maintenance
All TCOM control panels contain a lithium battery for backup. For good
measure, we recommend you replace the battery every two years. Refer
to "Battery Replacement" in the Custom TCOM Control Panels and
HyperlerminalAccess Manual, provided in Appendix F.
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NIN-OW-Vi -1, Rev. 1, 06/22 Copyright 0renco Systems®, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from 0renco: 800-348-9843.

Corrective Maintenance
An alarm is triggered when the liquid in a tank or treatment unit chamber
reaches a level that is either higher or lower than it should be, under
normal operating conditions.
When responding to an alarm, first determine the type of alarm being
activated. If it is due to pump failure, test each pump manually and locate
the failed pump. To replace the pump, see the "Removing & Replacing
Inoperative Pumps" section of this document. Remove the access lid and
visually inspect the liquid level. If a high liquid level or low liquid level has
caused the alarm, follow the appropriate procedures below.
High Liquid Level Alarm
1. Determine if the high water alarm is from higher than expected
usage (i.e., special event, etc.). If there is a long-term increase in
flows, then timer settings need to be adjusted accordingly.
2. When a high liquid level condition exists, the source of the problem is
likely to be one of the following:
a. Control panel breakers tripped — Check the circuit breakers,
switches, and fuses in the system control panel. If separate
breakers in the main panel were used for the pumps and controls,
also check these breakers. If a breaker is found to be tripped,
reset the breaker. If the breaker trips immediately, check the
wiring for a short or bad breaker. If the breaker or breakers don't
trip again, then the problem has probably been found or has
corrected itself. Test the automatic function of the system as
shown in the "Start-up & Operation" section of this manual to
verify proper operation.
b. Faulty floats — If, after checking the circuit breakers, fuses, and
switches, the pump still does not operate, toggle the "AUTO -OFF -
MAN" switch to "MAN." If the pump engages, the problem is likely
to be in the float system. (If the motor contactor engages but
the pump doesn't run, go to step f, "Water in splice box or loose
wires.") Pump the tank down to a level below the "Override Timer
On/Off" float. Cycle the pump to simulate the timer on and off
periods so the effluent is dosed to different zones of the treatment
unit. Toggle the "AUTO -OFF -MAN" switch to "AUTO." Do not leave
a pump in the "MAN" position unattended. If you do, the pump
can continue to operate without liquid, possibly drawing solids into
the filter and causing potential failures. Isolate the float switches
and check to ensure all floats are operating properly.
If a float is found to be faulty, refer to the "Removing & Replacing
Inoperative Floats" section in this document.
IMPORTANT! Before doing any work on either the wiring to the
level control floats and pump or inside the pump control panel,
switch off the power to the system at the service entrance panel
and set the circuit breakers in the panel to their "OFF" positions.
c. Pump clogged or not clean — Check the pump for discharge
flow. Close the ball valve, disconnect the union in the discharge
plumbing assembly and turn the union so it is facing down.
Engage the pump and visually inspect the approximate flow
rate being discharged. If you are unsure of the discharge rate,
measure the time it takes to fill a five -gallon bucket with the
discharge. Check this value against the appropriate pump curve. If
the flow rate is insufficient, the pump may need to be cleaned.
d. Valves closed — If the pump operates in the proper flow range,
check all downstream valves to ensure that they are in the open
position. If the valves are all open, test the discharge pressure of
the pump.
e. Pump failure or bad electrical connection — Check the panel to
verify the motor contactor engages. If it engages but the pump
doesn't operate, then it is either a pump failure or a bad electrical
connection.
Water in splice box or loose wires — Check splice boxes in the
system for water. Remove the stainless steel screws from the
splice box lid, being careful not to drop the screws. If the splice
box was submerged, or if there is a crack in the conduit, there
may be water in the splice box. If this is the case, remove the
water with a suction bulb, sponge, or other appropriate method.
Carefully check the splices to ensure they are intact and remain
watertight. If all splices are found to be watertight, replace the
splice box lid. In the control panel, carefully tug on each wire going
to the splice box. Correct any wires that are loose. Reactivate and
retest the system.
g. Leaks in tanks or treatment unit — If the system operates but
can't keep up with the flow, check the system for watertightness.
A leaking tank or treatment unit can infiltrate enough water to
overcome the pump. Also check for leaking fixtures in the facility
or home, though it is unlikely a leaky fixture could provide enough
liquid to overcome the pump.
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Copyright Orenco Systems-, Inc. Property of O4co Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-* 8-44 . NIN-ONM-AXM-1, Rev. 1, 04/;

Low Liquid Level Alarm
1. Determine the actual flows in the system. If the flows are considerably
less than the timer is set for, then adjust the timer settings to match
current flows. If a low level exists in the recirc/filtrate chamber, then
ensure the minimum run time is appropriately set.
2. When a low liquid level condition exists, the source of the problem is
likely to be one of the following:
a. Tank or recirc-filtrate chamber siphoning — Inspect the liquid level
in the tank. If the liquid level is below the "Redundant Off/Low
Level Alarm" float, then it's likely that the problem is either a leaky
tank or siphoning. Siphoning typically occurs when the system is
pumping downhill. A system will not necessarily siphon every time
it operates. It is dependent on the system design. A siphoning
system can be retrofitted with an anti -siphon valve. Most
siphoning problems will manifest in the first months of operation.
b. Tank or chamber leaks — If the hydraulics of the system do not
allow for siphoning, it is possible that the tank or the treatment
unit is leaking. Fill the tank or treatment unit to a normal operating
level and return to inspect at a later time. If the liquid level is
below the normal operating level, the tank or treatment unit is
leaking and needs to be repaired or replaced.
Removing & Replacing Inoperative Floats
IMPORTANT! Before doing any work on either the wiring to the
level control floats and pump or inside the control panel, switch off
the power to the system at the service entrance panel and set the
circuit breakers in the panel to their "OFF" positions.
1. Remove the float assembly. There is no need to move the settings
of the floats to remove and replace a float. After noting the tether
length, snap the inoperative float out of the holding collar.
2. Remove the screws from the splice box lid, being careful not to drop
the screws. Remove any water found in the splice box with a suction
bulb, sponge, or other appropriate method. Loosen the cord grip
at the splice box and identify the appropriate wire nut for the float.
Remove the wire nut and the appropriate common wire.
3. Remove the inoperative float and replace it with a new one. Push the
float cable through the watertight cord grip into the electrical splice
box. Leave an adequate length of electrical cord coiled inside the riser
to allow for easy removal of the float assembly. Do not remove the
colored markers or the paper tags from the float cords, and do not try
to thread the markers and tag through the cord grip. Tighten the cord
grip by hand, then test the tightness of the cord grip by tugging on the
cord. A cord is secure when the cord grip is tight enough to prevent
slippage.
4. Use a fresh waterproof wire nut to connect the float wires to the
wires from the control panel, following the wiring schematics
provided with the system plans. Always use watertight wire nuts for
all connections! Attach the common wire with the other commons
using a new waterproof wire nut.
5. Replace the float in the collar, using the same tether length, and
reinstall the assembly.
6. Reconnect power and test the unit per the instructions provided in
the "Start-up Inspection and Steps" section of this manual.
Removing & Replacing Inoperative Pumps
IMPORTANT! Before doing any work on either the wiring to the
level control floats and pump or inside the control panel, switch off
the power to the system at the service entrance panel and set the
circuit breakers in the panel to their "OFF" positions.
1. Close the ball valve on the discharge plumbing assembly, disconnect
the union, and carefully remove the pump and attached plumbing.
Disconnect the pump from the discharge plumbing assembly.
2. Remove the screws from the splice box lid, being careful not to
drop the screws. Remove any water found in the splice box with a
suction bulb, sponge, or other appropriate method. Label the wires,
Loosen the cord grip at the splice box and identify the appropriate
waterproof wire nut for the pump. Label the wires and remove the
wire nut.
3. Remove the inoperative pump and replace it with a new one of the
same type. Push the pump cable through the watertight cord grip
into the electrical splice box. Leave an adequate length of electrical
cord coiled inside the riser to allow for easy removal of the pump.
Tighten the cord grip by hand, not by tool; then test the tightness
of the cord grip by tugging on the cord. A cable is secure when the
cord grip is tight enough to prevent slippage.
4. Use a fresh waterproof wire nut to connect the pump wires to
the appropriate wires from the control panel following the wiring
schematics provided in the system plans.
5. Reattach the discharge plumbing assembly and carefully lower the
pump into the vault or flow inducer. Be careful not to lower the pump
by the cable or to pinch the cable when lowering it into the flow
inducer. Reconnect the union and open the ball valve.
6. Reconnect power and test the unit per the instructions provided in
the "Start-up Inspection and Steps" section of this manual.
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0
NIN-0W-V1 -1, Rev. 1, 06/22 Copyright 0renco Systems, Inc. Property of Crenco Systems, Inc. Do not reproduce or distribute without written authorization from 0renco: 800-3W9843.

System Performance
Because the influent characteristics, treatment train, and discharge limits
for every wastewater treatment system are unique, every commercial
AdvanTex Treatment System has its own unique performance signature. We
strongly recommend sampling the complete system, once it is in operation,
to establish your system's baseline performance and determine your
influent and effluent wastewater characteristics.
The table below provides approximate values of potential wastewater
characteristic numbers at specific points in the treatment process for an
AdvanTex system receiving typical strength waste as described in the
AdvanTex' AX-Max Design Criteria, NDA-ATX-MAX-1.
Wastewater Raw Primary Recirc/ Treated
Characteristic Influent Tank Blend Effluent
Effluent Effluent (Filtrate)
cBODS(mg/Q
2504M
150
40-60
10
TSS (mg/L)
250-400
30
30
10
TKN (mg/L)
40-80
40-80
40-80
<2
NO3(mg/L)
0
0
2-8
20-30
FOG (mg/L)
50-150
10-20
10-20
<5
DO (mg/L)
0
0
2-6
2.5-6
Alkalinity(mg/L)
200-500
200-5M
100-2M
100-150
l
6.5-8.5
6.5-8.5
6.5-8.5
6.5-8.5
' pH can be tested with litmus paper, a pocketpH meter, or a bench top pH meter.
When all parts of the AdvanTex system are operating correctly and the
component values in each part of the treatment process are within the
ranges above, you can expect to see typical results from field tests of
AdvanTex treated effluent (filtrate) that conform to the table below.
Parameter Sampling Typical Values
Method or Properties
Effluent Clarity
Visual'
Clear (<15NTus)
Odor
Sniff
Non -offensive odor (Musty is OK;
rotten eggs or cabbage is not OK)
Effluent Filter
Usual
No excessive biological growth
Biotul Pump Vault
Visual'
No liquid level differential inside/
outside vault, does not clog
between one-year cleaning
intervals
Oily Film on Effluent
Usual
None; no red, blue, green, or
orange sheen
Foam
Visual
None
Turbidity measurements can be taken with a portable turbidity meter or calibrated turbidity standards.
Odor can be checked with a suffide measuring packet, an offactorysnifter device, or by sniffing the sample.
If effluent is cloudy or smells pungent or if the biomat on the textile
filter appears greasy, waxy, or oily, laboratory tests of the filtrate will aid
troubleshooting.
Nitrogen Reduction Process
Total nitrogen reduction in standard AX-Max and AX-Mobile configurations
typically exceeds 60 percent. Using alternative configurations, total
nitrogen reduction can exceed 80 percent, depending on wastewater
strength and other characteristics such as cBOD5, FOG; pH, alkalinity,
temperature, and hydraulic retention time. Because nitrogen reduction is a
complex, multi -staged process, it's important to understand the process,
its related factors, the signs of effective nitrogen reduction, and how to
keep the process optimized.
It's also important to know the total nitrogen (IN) limits required by the
system user's permit. Some regulatory agencies have no requirement;
some require a specific percentage reduction of a certain kind of nitrogen
(90-95 percent nitrification of ammonia nitrogen, for example); and some
require TN reduction to levels at or near drinking water quality at the point
of final dispersal.
Finally, because influent characteristics greatly affect the amount of
nitrogen reduction possible from any given system, it's vital to know the
alkalinity of your waste source and the local or regional norms for organic
and ammonia nitrogen.
In nitrogen reduction, ammonia is converted to nitrate in an aerobic
environment, and then reduced through bacterial action in an anaerobic
environment to nitrogen gas, which is released harmlessly to the
atmosphere. Typical -strength wastewater has an ammonia level of about
60 mg/L and a TN of about 70 mg/L. Optimum nitrogen reduction typically
requires the following:
• Adequate alkalinity of approximately 250 mg/L or higher.
• pH of 6.5-8.5. Fixed -film microbial processes generally thrive
between pH 6.5 and 8.5. Treatment problems typically result from
rapid changes in pH rather than extreme long-term mean values,
although long-term levels can result in less efficient process activity.
• Primary tank DO level of 0 rill filtrate DO level of 2.5-6 mg/L.
• Adequate time for the nitrifying bacteria to develop (1-3 months).
• Adequate temperature (below 400 F retards the process).
• Good organic removal (cBODS).
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Copyright Orenco Systems, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from 0renco: 800-348-9843. NIN-ONM-Ai -1, Rev. 1, 06/22

Signs of Effective Nitrogen Reduction
Following is a brief summary of indicators of good nitrogen reduction:
• Clear, odorless filtrate effluent (a "see and sniff" testis generally
considered sufficient).
• Normal -looking biomat on the textile filter eight -brown to dark -brown
and gelatinous in texture).
• Additional filtrate tests will show ...
— Typically, low cBOD51 low turbidity and high clarity.
— Filtrate DO of about 2.5-6 mg/L.
— Low ammonia levels (typically from <1 to 3) and relatively high
nitrate levels, since nitrification converts ammonia to nitrate. Lower
nitrate levels are typically found after the denitrification process
takes place.
Performance Indicators of Nitrogen Reduction
To judge the nitrogen -reducing performance (or potential) of any wastewater
treatment system, be sure to check the following performance indicators:
Influent Characteristics — Influent characteristics will greatly affect
the amount of nitrogen reduction that is possible from any wastewater
treatment system. High solids and/or fats and cooking oils increase the
oxygen demand and accumulation of material on and within the media,
affecting the available oxygen for nitrification.
Clear, Odorless Effluent— Simple, "see and sniff" tests can
be performed in the field. Effluent from Treatment Units that are
performing well should be clear (turbidity <15 NTUs) and odorless.
Laboratory Tests for Ammonia and Nitrate Nitrogen — If the
system is oxidizing ammonia to nitrate (nitrifying), lab tests should
measure relatively low ammonia levels and relatively high nitrate levels
in the filtrate. Because nitrification responds to many and varying
conditions within the aerobic treatment processes, ammonia and
nitrate nitrogen levels in the filtrate are the most ideal constituents to
watch for any changes in performance. Start-up times can be plotted,
optimum recirc ratios can be gauged, cleaning frequencies can be
predicted, and nonvisible clogging or saturation can be detected by
watching either of these constituents. Typical nitrification is expected
to be in the 98-99 percent range. Investigate if the process appears to
degrade by 5 percentage points or more.
cBOD5 Levels —The nitrification process requires oxygen, which is
why nitrification is enhanced when cBOD5 is extremely low. Measures
of filtrate cBOD5 should be <15 mg/L, although higher cBOD5 may
not necessarily correlate with low levels of nitrification. When cBOD5 is
high, there is a greater organic demand for oxygen, which may hamper
the nitrogenous demand for oxygen. Increasing the recirc ratio should
help establish oxygen balance.
Biological Growth on Filter — Biological growth on the filter media
inside of treatment units is natural. The biological growth should
appear light -brown to dark -brown in color and gelatinous in texture.
Dissolved Oxygen (DO) — Dissolved oxygen also provides critical
information with which to diagnose how well a system is performing.
Measures of filtrate DO should be in the range of 2.5 to 6 mg/L. If
the DO level drops, the degree of nitrification will normally drop as
well, which could be a sign of blinding or saturated flow conditions
— anything that might inhibit free air from flowing into the system.
(Nevertheless, it's quite possible to have low filtrate DOs and still have
high effluent quality, as measured by cBOD5 and TSS levels.)
pH and Alkalinity — pH is typically 6.5-8.5 for normal nitrogen
loads. The nitrification process releases hydrogen ions into solution,
which tends to lower the pH level. Alkalinity is essential for nitrification.
For each part of ammonia that is nitrified, 7.14 parts of alkalinity are
consumed (buffering the acidity caused by the release of hydrogen
ions). Consequently, if the degree of nitrification is less than expected, it
could simply be a lack of sufficient alkalinity to support more. Typically,
nitrification requires alkalinity above about 250 mg/L for recirculating
processes.
Some wastewater streams do not have sufficient alkalinity to support
complete nitrification. In these cases, the nitrification process can
deplete the alkalinity and drop the pH to a level that retards microbial
activity (<6.5). Recirculating the effluent helps, since half the alkalinity
can be restored in the recirc or process tank, wherever denitrification
occurs (and adjusting the recirc ratios may also bring the pH back to
preferred operating levels). But wastewater streams that are alkalinity -
starved can't provide for 100 percent nitrification.
Low -Flush Fixtures —The use of low -flush fixtures can reduce
nitrification performance. Low -flush fixtures tend to reduce hydraulic
loads, which causes elevation of wastewater constituents (i.e., higher
concentrations of cBOD5' TSS, TINT, etc.). In this case, the available
alkalinity in the water supply may not be adequate to accomplish the
full level of nitrification desired.
Additional buffering may be necessary to accomplish the level of nitrification
desired. In low alkalinity conditions, pH adjustment can be made with the
addition of quicklime or hydrated lime, soda ash, or caustic. If the alkali is
to be introduced at a process point preceding sedimentation zones, such
as in the tank, lime would be preferred. Soda ash and caustic both contain
sodium, which is a dispersant and will impede settling of solids in the tank.
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0
NIN-0W-V1 -1, Rev. 1, 06/22 Copyright 0renco Systems, Inc. Property of Crenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-3W9843.

Troubleshooting Effluent Quality
Once you know the typical values for your wastewater treatment system's
performance, you can be proactive and troubleshoot nontypical process
indicators, before system performance is affected.
Poor Effluent Quality
If your effluent samples are cloudy and color/turbidity is significantly higher
than expected ( >15 NTU), do the following:
• Check the effluent filters or Biotube® filters for clogging.
• Check to see if the textile filter smells of chemicals (medication,
chlorine, etc.) or has a granular or crusty appearance. (For example,
a white crystalline crust could signal that water softener discharge or
industrial strength detergents have been flushed into the system.)
• Check for a recirc ratio that is too high or a pump dose time that is too
long.
• If effluent cBOD5 is high and TSS is low, a large amount of soluble
cBOD5 has not yet been consumed. That could be because the recirc
ratio is too low for the influent strength or insufficient start-up time has
elapsed. Typical organic reduction within the first 24 hours in systems
is around 75 percent or greater. As the biomat develops, greater
reductions in the soluble cBOD5 will occur (typically within the first
7-10 days). With higher influent strength, soluble cBOD5 is not readily
removed until the biomat on the media is established.
• Check that the unit is properly ventilated.
• Interview the users about system abuse, especially regarding harmful
chemicals, solvents, strong cleaning agents, or water softener
backwash.
Note: Water softener backwash is extremelyhigh in salts,
which can disrupt system performance, especially nitrogen
reduction processes. Make sure that no water softener backwash
is discharging into the primary tank. Plumbing water softener
backwash into the primary or equalization tank voids the warranty.
If none of these troubleshooting steps makes a difference, lab tests may
be necessary to determine the cause of the problem. Call your Dealer or
Orenco for recommended lab tests or design remedies.
Odor
If the inside of the treatment unit smells like rotten eggs or cabbage:
• Check dissolved oxygen levels using a DO meter or DO wet test kit.
• Note filtrate DO levels of <2.5 pess than 2.5) or >6 (greater than 6)
mg/L. Filtrate DO levels of <2.5 mg/L indicate insufficient oxygen.
Filtrate DO levels >6 mg/L indicate excessive aeration.
If the filtrate DO is <2.5 mg/L:
• Check the filter surface for evidence of clogging.
• Check that the pump is working.
• Check for proper ventilation in the unit.
• Check the recirc ratio; increase the recirc ratio if it is too low.
• Check that influent strength isn't too high.
• Check to ensure hydraulic retention time isn't high.
If the filtrate DO level is >6 mg/L:
• Check the influent flows and recirc ratio. If influent flows are below
normal or the recirc ratio is too high, reduce the recirc ratio.
Effluent Filter or Biotube° Filter Clogging
If a visual inspection of the effluent filter or Biotube° filter for biomass build-
up shows the need for cleaning more often than once a year an annual
cleaning cycle is typical, try the following:
• Verify the pump isn't running too long (typically 3 cycles/hour).
• Check for excessive FOG and TSS in influent; if excessive, a review
of component sizes may be required.
Oily Film
All signs of FOG anywhere in system downstream of the primary tank must
be investigated prior to action. Excessive grease and oil ( >25 mg/L) is
typically a design or management concern.
• Sample and test at all process steps, including influent (if possible).
• Label, date, and photograph all samples.
• When photographing, use standard glass beakers and set samples
in front of a common, uniform background
• Check biomat accumulation at AdvanTex Filter.
• Note if biomat is yellowish and wax -like or lard -like. If so, scrape
biomat sample for analysis.
• Photograph/document biomat sample.
• Send to lab with effluent samples.
Foam
Foam rarely occurs in AdvanTex Treatment Units. If you see foam in the
treatment unit, call your Dealer or Orenco.
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Copyright Orenco Systems-, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-* 8-44 . NIN-OW-V -1, Rev. 1, 04/;

Troubleshooting Nitrogen Reduction
If you suspect that the system is not meeting expectations for nitrogen
reduction, troubleshoot each of the critical factors that contribute to optimum
nitrogen reduction, to determine a cause.
Filtrate Alkalinity Too Low — Sufficient alkalinity is required
to achieve the desired degree of nitrification for any wastewater
treatment system, because it takes 7.14 parts alkalinity to nitrify 1 part
ammonia. If filtrate alkalinity is too low:
• Check the recirc ratio; a high recirc ratio increases alkalinity
consumption.
• Check influent TKN or ammonia levels and source alkalinity.
If a large quantity of nitrification is required, it may be necessary to add
alkalinity -raising chemicals to the system.
Filtrate pH Too Low— Nitrification is particularly sensitive to pH
but tends to thrive at levels between pH 6.5 and 8.5. The nitrification
process releases hydrogen that consumes alkalinity and causes pH
levels to drop. A pH level of <6 retards microbial activity of all kinds,
including denitrification, and with a pH level <5.5, nitrification may
show signs of degradation. Maintaining an alkalinity of 50 to 80 mg/L
in the treated effluent is typically sufficient to maintain pH levels
above 5.5. If the filtrate pH level is too low:
• Check influent alkalinity level (pH drops when too much available
alkalinity is consumed).
• Check recirc ratios; reduce if too high.
• Ask the system users about chemical discharges into the system,
including carpet cleaners, chlorine, and photo developing agents.
Filtrate DO Levels Outside Range of 2.5-6 mg/L— If filtrate DO is
too low (indicating insufficient oxygen), the system may release sulfide
odors during dosing events, or there may be a more lasting smell
within the treatment unit(s). Try the following:
• Check for surface clogging/ponding and clean as necessary.
• Check air flow through the vent assembly.
• Check the recirc ratio; if it's too low (<2:1), increase as necessary.
If the system's filtrate DO is too high (indicating excessive aeration), it's
likely that excessive recirculation or insufficient hydraulic retention time are
factors. Try decreasing the recirc ratio.
High Filtrate Ammonia Levels — Because ammonia is
biochemically oxidized to nitrate during nitrification, high ammonia
levels are a sign that something is amiss. Try the following:
• Check for surface clogging/ponding and clean as necessary.
• Check for sufficient aeration (measure DO).
• Ensure no blockage of air flow into textile filter (indicated by thick
biomat development or a build-up of grease and oils).
• Ensure no blockage in the manifold, causing ...
— Localized hydraulic overloading, saturation.
— "Short circuiting" between textile sheets.
• Check for sufficient alkalinity; if insufficient, consider supplemental
buffering using equipment that automatically adds an alkaline
compound to the system. Call Orenco for assistance, if necessary.
Low Filtrate Nitrate Levels —AdvanTex treatment units normally
yield more than 95 percent nitrification (conversion of ammonia
to nitrate). Therefore, the ammonia levels in the filtrate should be
low and the nitrate levels higher. Some denitrification occurs in the
treatment unit, so the normal nitrate level may vary. Be sure you
are familiar with the mode of operation, as some AdvanTex modes
are configured to produce lower nitrate levels. If it appears that
nitrification is dropping off:
• Check the recirc ratio; adjust as necessary (high recirc ratios may
drive pH too low for effective nitrification/denitrification, and low
recirc ratios may not provide sufficient aeration).
• Verify incoming ammonia levels.
• Check recirc/blend for excessive organic food source (high cBODS
may cause greater oxygen demand through the filter, reducing
nitrification).
Adequate Time and Temperature — Nitrifying bacteria require one
to two months to develop. Temperatures below 400 F (4° C) retard the
development of nitrifying bacteria. If the AdvanTex Treatment System
has been installed during a period of cold, nitrification may not "kick in"
for several months until warmer temperatures are reached. Typically,
a June -September installation provides the necessary temperatures
for a 30-60 day nitrification start-up time. Once nitrifiers colonize, they
typically continue to nitrify through normal winter conditions. Only in
severely cold regions should additional insulation of the treatment unit
be necessary.
Nitrogen removal (or "nitrification/denitrification") is a biochemical
process. In nitrification, ammonia is oxidized to nitrate (2NH3
converts to 2NO3 + 31-120). This nitrate is then reduced through
bacterial action (denitrification) to nitrogen gas, which is released
harmlessly to the atmosphere.
During the nitrification process, about 9 parts oxygen are consumed
in converting 2 parts ammonia to nitrate. Therefore, depending
on the concentration of ammonia, a considerable amount of air
may be needed. Other processes, like cBODS reduction, may
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NIN-OW-Vi -1, Rev. 1, 06/22 Copyright Orenco Systems, Inc. Property of Crenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-3W9843.

occur simultaneously and further elevate the demand for aeration,
especially if the organic level is high. In an abundance of air, all the
aerobic or facultative microbes compete for their share of oxygen.
When the organic concentration is high, the microbes that oxidize
organic matter, primarily the heterotrophic bacteria, are aggressive
and tend to outcompete other microbes for the available free oxygen
in solution. Ammonia is oxidized by autotrophic bacteria, which do
not have as aggressive a growth rate, so if oxygen is not abundant,
nitrification suffers. Consequently, the nitrification process usually
lags until the organic concentration is depleted or until sufficient
oxygen is present. At a 2.5:1 cBOD5/TKN ratio, the nitrifiers may
only make up about 10 percent of the microbial population. At
0.5:1 cBOD5/TKN, the nitrifiers make up about 35 percent of the
population.
In a filtering process, the filter column must be deep enough or the
filter media must be efficient enough at filtering organic particles
to deplete concentrations of organic material to a level in which
a sufficient population of nitrifiers will be sustained. The physical
(dimensional) features of the filter will vary depending on the media's
characteristics — void ratio, moisture holding capacity, and effective
surface area per unit volume ratio.
........................................................................................
Copyright Orenco Systems-, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Orenco: 800-* 8-44 . NIN-OW-V -1, Rev. 1, 04/;

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NIN-ONNI-AXNI-1, Rev. 1, 00/;2 Copyright Orenco Systems -,Inc, Property of Orenco Systems, Inc. Do not reproduce or distribute wlthoA written authorization from Orenco, 800-348*4 3,

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Copyright Orenco Systems-, Inc. Property of Orenco Systems, Inc. Do not reproduce or distribute without written authorization from Ore1,4: 800-* 8-44 . NIN-OW-V -1, Rev. 1, 06/22

AdvanTex Treatment Systems are
U`
listed to NSF/ANSI Standards 40
0
FA
C US
and 245 for Class I Systems.
LISTED
Australian
Standard
wf.u%op r e n c a
W A T E R
800-348-9843•[phone]
www.orenco.com
www.vericomm.net
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
NIN-ONNI-AXNI-1, Rev. 1, 00/22 Copyright Orenoo Systems-- Inc, Property of Orenoo Syste0
ms,
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Inc, Do not reproduce or distribute without written authorization from Orenoo, 800-348*4 3,

Atlantic OBX
P.O. Box 2560
Kitty Hawk, NC 27949
September 23, 2022
Joseph Anlauf, P.E.
4721 Eckner St
Kitty Hawk, NC 27949
Re: Willingness to Serve
Riversound WWTP
Chowan County, NC
Dear Mr. Anlauf,
Atlantic OBX provides this letter to verify that we are willing to provide residuals management, to
include the hauling and disposal of primary tankage sludge and treatment process residuals. Atlantic
OBX is able to manage the residuals from the subject facility up to an anticipated flow of 10,000
gpd.
A copy of this letter should be submitted to the county or state regulatory agency.
_ Sincerel ,
G Eo
Atlantic OBX
252-255-2030
Livicalvi
/�7w-
https://www.atlanticsewaL,e.com/