WQ0037287_More Information (Received)_20210609

a 0 9".
Michael C. Gallant PE, PA
Engineering / Consulting / Design
NC Firm C-1989, AL Firm CA - 4338 — E
NC Reg. No. - 25572, AL Reg. No. - 32178
Laruen Raup Plummer, Engineer III
Division of Water Resources
NCDEQ
617 Mail Service Center
Raleigh, NC 27699-1617
June 9, 2021
Re: Additional Information Request — WQ0037287 — Pluris Hampstead WWTP
Dear Ms. Plummer,
I am in receipt of your request for additional information dated June 8, 2021. Please see my responses
to your comments below. Your original comments are in italics. I have attached several documents to
this email in response to your request.
A. Cover Letter:
1. The basis of design document listed flowmeters, dissolved oxygen meters, and all other associated
devices as already being in place for this modification. How long has this equipment been on -site, and is
this equipment in good working order and calibrated?
The operator has informed me that the flow meter and dissolved oxygen probe in question are on site
and working fine. Normally the flowmeters for the PA tanks are not calibrated because they are not
used for reporting just process control. The DO probes are validated by the operators using hand held
probes daily to verify the readings sent to the SCADA system by the in -place probes. Typical
maintenance of the probes is performed according to the manufacturer's literature.
C. Application:
1. Within the wastewater treatment facility design criteria (Item V.11.c), the disinfection section was not
completed. Please indicate the method of disinfection being utilized for the expanded treatment
capacity.
The first phase of the plant was permitted without disinfection. This was supported by several technical
papers from EPA and other sources documenting the ineffectiveness of UV, chlorination and ozone to
add value to the process based on the fact that MBR removes bacteria mechanically due to pore sizing
of the membranes. Subsequently an NPDES permit was obtained for the plant and a peracetic acid
system was installed as an emergency back-up system. Both the peracetic acid disinfection system and
the NPDES outfall have never been used. Since there was no change proposed to this arrangement that
section of the application was not filled out. I would reiterate the fact that disinfection for bacteria is
not effective after MBR treatment simply because the membranes do not allow bacteria to pass through

a 0 9".
Michael C. Gallant PE, PA
Engineering / Consulting / Design
NC Firm C-1989, AL Firm CA - 4338 — E
NC Reg. No. - 25572, AL Reg. No. - 32178
to the effluent. To my knowledge, there have been no issues with fecal coliform at the plant and I do
not feel that disinfection should be stipulated in the permit.
2. Per Item IV.10, the groundwater well table under General Requirements, there appears to be some
discrepancy between the well locations provided and those observed in the field and depicted on the Site
Map (Sheet C1.3). One of the monitoring wells appears to have been installed south of the borrow pit
pond instead of north of the pond as proposed in the existing permit. Please provide updated location
information for the installed wells to the nearest tenth of a second.
It is my understanding that during a recent site inspection a new location for the monitoring well was
selected. I have revised the application to show this new location. Please be aware that the original
location was approved by staff and inspected on several occasions prior to this most recent inspection.
D. Property Ownership Documentation:
1. Property ownership of parcel (3271-08-8507-0000), the location of the groundwater storage pond,
appears to be owned by a 'Blake Farm" and not Pluris Hampstead, LLC. Has an agreement between
Pluris Hampstead, LLC and Blake Farm Pond, LLC been recorded with the Pender County Register of
Deeds pursuant to 15A NCAC 02T .0108(b)(1)(B) per Condition 1.3 of the existing permit and pursuant to
15A NCAC 02T .0704(f)? Please provide a copy of the recorded agreement and note that this will also
satisfy Condition 1.3 of the existing permit.
The owner has been contacted regarding this matter. There was an original executed agreement
submitted when the plant was first permitted. The owner is researching the recordation of the
document and will respond shortly. If the document has not been recorded then it will be done.
I. Engineering Plans:
1. Within the plan sheets the notation "Q1, Q2, and Q3 is used. It appears that this refers to phases with
Q1 = 250,000 gallons per day (GPD) having been installed and currently in operation. However, Q2 is
listed at 625,000 GPD, but it is our understanding that the current phase expansion is to a total capacity
of 500,000 GPD. Please provide clarification and revise the Plan Sheets as necessary.
The designations of Q1, Q2 and Q3 On sheet C1.2 refer to peak flows for the plant. These were specified
for the NPDES permitting process which required a 2.5 peaking factor for a flow of 250,000 gpd (250,000
x 2.5 = 625,000). The expansion is for 500,000 gpd. Please note that the hydraulics of the plant are
designed to meet or exceed a peak hourly flow of 1 MGD. The addition of the large equalization basin
should greatly reduce the effects of peak flows on the plant. Please note that the permeate pumps
exceed this 1 MGD peak flow when all three are in operation and there is a spare pump at the plant
should one of those fail. I have revised the plan sheet accordingly.
2. Within the plan sheets there are two C1.3 sheets, the first depicts the Site Map and the second depicts
a more detailed plan view of the treatment structures. The second C1.3 was signed and sealed but not
dated. The date on this sheet reads "xx/xx/xxxx". Please revise and submit a fully certified plan sheet.

a 0 9".
Michael C. Gallant PE, PA
Engineering / Consulting / Design
NC Firm C-1989, AL Firm CA - 4338 — E
NC Reg. No. - 25572, AL Reg. No. - 32178
This sheet has been revised to show a current date and the correct sheet number. I apologize for the
confusion.
3. Per Sheet P&ID 1.3 of 8, it appears that the labels for the digester and equalization lines are flipped.
Please review and revise as needed.
This plan sheet has been revised.
4. Are the chemical storage tanks and chemical metering pumps sufficiently sized for the increased
capacity? Chemical dosing is referenced within the membrane bioreactor sheets but the reference sheets
were not included in the submittal. These components were not mentioned within the Basis of Design
document and did not appear to be depicted in the Plan Set.
I asked the operator to provide the current pumping rates versus the overall pump capacities. He has
informed me that aluminium sulfate pump max is 1.6 ghp. The pump is running at 9% roughly 24gal per
week. The Micro-C pump max is 20 gph and is currently running at 8.33% with a weekly usage 279.88
gal. The plant is seeing an average daily flow in the range of 200,000 gpd. Given this flow and
the low settings on the metering pumps there should be no issue with them providing the
appropriate feed rates. Please also note that these pumps were installed with duplicates for
back-ups.
5. Detail drawings for key components such as trenching/bedding requirements, pipe insulation, valve
boxes, and other appurtenances were not provided. Please provide the detail drawing sheets for our
review.
The standard details were added to the plan sheets C1.5
1. A project construction sequence was not included within the provided specifications. Will infiltration
activities be shutdown for construction activities? Please provide a construction sequence and indicate
which tasks will require bypassing or operations shutdown.
Due to the shallow depths of the lines being installed and the fact that these lines are not within the
underdrain boundary the infiltration basins will not need to be shut down. I have included a
construction sequence as an addendum to the specifications.
2. Within the equipment specifications please indicate the total number of pumps/blowers units to be
installed and indicate that a backup/standby unit is being provided as needed to meet the requirements
of 15A NCAC 02T .0705(j).
I have included a listing of the proposed equipment for the expansion as an addendum to the
specifications. Please note that a similar listing can be found on plan sheet C1.0.
3. Within the specifications it lists that the wasting/rescreening pumps are to have an operating point of
75 gallons per minute (GPM) and a note within the engineering calculations indicates that each pump is

a 0 9".
Michael C. Gallant PE, PA
Engineering / Consulting / Design
NC Firm C-1989, AL Firm CA - 4338 — E
NC Reg. No. - 25572, AL Reg. No. - 32178
to be sized at 75 GPM. The provided documentation within Appendix I Tab 6 for the wasting/rescreening
pumps appears to indicate an operating point of 26.5 GPM at 16.9ft of head. Please review and provide
clarification or revision as necessary.
The total rate for all three pumps is 75 gallons per minute or 25 gpm each. I have revised the
specifications accordingly. I have revised the calculations to show that the total pumping rate is 75 gpm
(25 gpm for each pump)
K. Engineering Calculations:
1. Within the provided calculations and basis for design documents, it appears that the design
parameters are based off of values published within "Wastewater Treatment Plants -Planning Design and
Operation". Have samples from the facility been collected to confirm that the published values are
representative of those experienced at this facility?
The plant staff do not collect influent samples as a general practice. The values in the Basis for Design
are consistent with what one would expect from typical domestic sewage. To date the plant has had no
issues with meeting its limits for nutrients or BOD. That said the operator has been directed to sample
the influent.
Unfortunately, the nature of influent is such that you would expect to see considerable variation in
parameters like Total Nitrogen and BOD. In order to really get a reasonable appreciation of the influent
the staff would have to sample it regularly. Since there has not been an issue with effluent quality it
would be hard to justify a regular sampling regime.
2. Please provide the spreadsheets/formulas utilized in the design calculations for our review.
I have attached the spreadsheet as you have requested.
N. Operation & Maintenance Plan:
1. An Operation & Maintenance (O&M) Plan was not provided as part of the project submittal. Within
the application checklist, it is indicated that an O&M Plan is to be submitted with all application
packages. Please review the existing O&M Plan, revise the plan as necessary for the proposed
modifications, and submit for our review. The O&M Plan must meet the requirements outlined within
15A NCAC 02T .0707.
1 have attached an updated O and M plan for your review.
P. Additional Documentation:
OExisting Permit:
1. Within the existing permit, the facility description lists the membrane bioreactors (MBR), but a tank
volume was not provided. Please provide the as -built tank volume for the existing MBR units.

a 0 9".
Michael C. Gallant PE, PA
Engineering / Consulting / Design
NC Firm C-1989, AL Firm CA - 4338 — E
NC Reg. No. - 25572, AL Reg. No. - 32178
There are 3 membrane zones. Each zone has a volume of 20,198 gallons for a total of 60,594 gallons.
Please note that this is predicated upon a side water depth of 15 feet. This depth is adjustable to some
degree by using the telescoping valves located in each basin. The value stated above is the design value
which is mirrored by the as -built value. In an MBR zone this is always the case because the equipment
and supports are shipped as designed from the manufacturer. If the basins are not built correctly then
the equipment will not fit. These dimensions are checked, re -checked and checked again during
construction. I personally verify the length and width with a tape measure prior to the concrete being
poured. This is one instance in the plant construction where not meeting the dimensions shown on the
plans can cause enormous problems.
As a rule, the design dimensions of the various tank cells exceed the required volumes to avoid any
issues should there be a small discrepancy during construction.
If you should have any additional questions or concerns, please feel free to call or email me.
Sincerely,
Michael C. Gallant, PE

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SITE MAP -PLANT AND HRI BASINS
RECORD DRAWING
. Michael C, Gallant PF, PA PLURIS HAMPSTEAD, LLC
Engineering 1 consulting I Design 2100 MCKINNEY AVE
Pl�fl�e #A RZ4� P,N SUITE 1550
[e-mail] 40T €fit CUB T10t DALLAS, TX 75201
PO BOX 4039 SURF CITY, NC 28445 �,'�1y�soe�e@P <'
'n,4pLC Gp�. NOTE: ANY PLAN THAT GOES NOT DEAR ANC ® —
910.448.1048 ENGINEER'S SEAL, SIGNATURE AND DATE IS A
SM FlRtl CC t989 PRELIMINARY PLAN AND NOT RELEASED FOR
C4989 CONSTRUCTION

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NONRESIDENTIAL WELL CONSTRUCTION RECORD
North Carolina Department of Environment and Natural Resources- Division of /Water Quality
•m,�"q,,", a+• WELL CONTRACTOR CERTIFICATION # H I I q,'A
1. WELL CQNTRACTOR�'
: d. TOP OING IS FT. Above Land Surface*
op ofcasing terminated at/or below land surface may require
Well C'oV'actA(Inddiilvid
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a variance' accordance with 15A NCAC 2C . 118.
`^ �" eeYIELD (gpm): M&AOD OF TEST
We ontraci
om any Name
f. DISINFECTION: Type Amount
Street
d�d'[''ellss
g. WAT ZONES (depth):?
Top Bottom _ 3d Top Bottom
ity or
Town
State
Zip Code : Top Bottom Top Bottom
Top Bottom Top Bottom
Area code
Phone nu er
Thickness/
2. WELL INFORMATION'
WELL CONSTRUCTION PERMIT#
OTHER ASSOCIATED PERMIT#(if applicable)
SITE WELL ID #(if applicable)
3. WELL USE (Check One Box) Monitorin Municipal/Public ❑
Industrial/Commercial ❑ Agricultural ❑ Recovery ❑ Injection ❑
Irrigation❑ Other ❑ (list us _
DATE DRILLED
4. WELL LOC pNA b / A' Sdo '-L< A;1 l
(Street Name, Numbers, Community, Subdivision, Lot No., Parcel, Zip Code)
CITY: COUNTY
TOPOGRAPHIC / LAND SETTING: (check appropriate box)
[]Slope ❑Valley ❑Flat ❑Ridge ❑Other
LATITUDE 36 " DMS OR 3X.XXXXXXXXX DD
LONGITUDE 75 " DMS OR 7X.XXXXXXXXX DD
Latitude/longitude source: ❑GPS Elropographic map
(location of well must be shown on a USGS topo map andattached to
this form if not using GPS)
5. FACW (Name of the business where the well is located.)
A
FaciliTq r 'J�dFacility ID# (if applicable)
StreetAddress . - .. A . - .. A .
City or Town State Zip Code
1�,(,,1
Area code Phone number
6. WELL DETAILS: SIC)
a. TOTAL DEPTH:
b. DOES WELL REPLACE EXISTING WELL? YE)I NO ❑
c. WATER LEVEL Below Top of Casing: , FT.
(Use "+" if Above Top of Casing)
7. PMSING:DepthDIRe1pr V)ghToBottom'- Ft. //
Top Bottom Ft.
Top Bottom Ft.
8. GROUT: Depth Material tho p
Tope iin Ft. f l
Top--�� ottom Ft.
Top LLI Bottorff'° 6 Ft. Of
9. SCREEN: Depth Dla eter
Sot Size VatyLeerial
ToBottom` Ft. I.. In.
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Top
Bottom Ft. in. in.
Top Bottom Ft. in, in.
10. SAND/GRAVEL PACK:
Depth z Ma i l� � j�
TopBottom O Ft. VXk
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Top Bottom Ft.
Top Bottom Ft.
: 11. DRILLING LOG
Top Bottom
: 12. REMARKS:
DescriptionFormatio
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I DO HEREBY CERTIFY THAT THIS WELL WAS CONSTRUCTED IN ACCORDANCE WITH
15A NCAC 2C, WFAL CONSTRUCTION sTANPARDS, AND THAT A COPY OF THIS
RECORD HAS B PR DE HE L OWNER.-y���(j
SIGNATUFP OF CERTIFIED WELL 111��CTOR DATE
PRINTED NAVE OF PERSON -CONSTRUCTING THE WELL
Submit within 30 days of completion to: Division of Water Quality Information Processing, Form 109
Y p tY ' 9 Rev. 2/09
1617 Mail Service Center, Raleigh, NC 27699-161, Phone: [phone]

Sage Drilling & Pump Services, llc
Well Drilling License #4119-A
204 Tom Ave Castle Hayne, NC 28429
910-231-6669
RE: PLURIS
1095 Hwy 210, Sneads Ferry, NC 28460
Office: 910-327-2880
Fax: [phone]
Email:
5-26-21
*Hampstead Plant
-2inch pvc, monitor well. 30ft.
-Screen from 20ft. -30ft.
-With concrete 2x2 pad, locking well protector & well tag
-GW1 well log submitted to client and state
Total........................................................................................................ $3,950.00
"Thank You Very Much For Your Business"

PLURIS HAMPSTEAD WWTF
MBR-HIGH RATE INFILTRATION WASTEWATER TREATMENT
FACILITY
REVISED 6-9-21
p = v
OPERATIONS & MAINTENANCE PLAN
FOR THE OPERATOR IN RESPONSIBLE CHARGE AND ASSOCIATED STAFF
• SYSTEM OPERATION AND ANTICIPATED MAINTENANCE
• SAFETY MEASURES AND RESTRICTED ACCESS
• SPILL CONTROL, EMERGENCY RESPONSE, EMERGENCY CONTACT
INFORMATION

I. SYSTEM OPERATION AND ANTICIPATED
MAINTENANCE
1.0 OPERATIONS AND MAINTENANCE OVERVIEW
1.1 Biological wastewater treatment is the process by which a large mass of bacteria
is utilized to process nutrients from an influent waste stream. Because the process is
biological in nature, it is ever changing. The mass of bacteria, also known as, mixed
liquor is constantly changing and evolving with a momentum and inertia that can carry
the processes in unintended directions if not corrected in a timely manner.
The goal of a successful operator is to understand the changes and direction of the
movements in biological character of the mixed liquor, and to use this knowledge to
direct the biomass to achieve optimal effluent quality.
This manual is intended to give a brief introduction to the proposed membrane
bioreactor system. No manual or text can ever replace the experience of a seasoned
operator. The theory of this manual is based on two basic principles.
I . Having intimate knowledge of all the systems in the plant and examining each
on a daily basis allows the operator to become aware when something is
different. These observations would include the sight, sound, and scent of
various system components. When operating correctly a plant and its
components look, sound and smell a certain way. When the operator notices a
change it usually represents a pending problem. Changes in mixed liquor color,
flock texture, motor sounds, and liquid levels all may reveal problems that need
attention.
2. Regular, methodic, thorough maintenance is the proverbial "apple a day" for
any wastewater system. A well maintained system, from lubricating a motor to
maintaining the landscaping, makes the life of the staff easier. A system that is
not well maintained or maintained sporadically is a snake in the grass waiting
to strike.
These principles rely on experience with a system. No two plants are the same and
even two identical plants with similar influent can exhibit different characteristics and
produce effluent of differing quality.
This manual will proceed to walk through the plant from the odor control wet well to
the infiltration basins and suggest tasks to perform at specific time periods. In some
instances, the operator will be directed to make observations of the plant, not only for
normal process control but for later comparison in times of upset or other plant
dysfunction.
Because of the biological nature of the activated sludge process, the plant will have a
"set point" or "sweet spot". These terms refer to the characteristics of the biology when
the plant is running at an acceptable level. These characteristics include but are not
limited to the following;

• Aeration dissolved oxygen concentration.
• Aeration pH
• MLSS or MLVSS levels
• Influent BOD
• Food to Mass ratio
• Mixed liquor temperature
• Sludge retention time
• Flock texture
• Mixed liquor color
It is advisable that the operator record several such data points when the plant is
running well in every season. In case of an upset these "set point" characteristics can be
compared to the characteristics at the time of the upset.
2.0 PROCESS OVERVIEW
2.1 The proposed expansion of the Pluris Hampstead Wastewater Treatment
Facility (PHWWTF) utilizes a membrane bioreactor treatment scenario. In essence, the
plant is an activated sludge process. Unlike a typical activated sludge processes the
system does not have a secondary clarifier or tertiary filters. Instead, the process relies
on a membrane to physically block and filter solids from passing to the effluent. Unlike
typical activated sludge processes, the mixed liquor suspended solids (MLSS)
concentration is in the 8,000 ppm range instead of the typical 3000 to 4000 ppm range.
This greater concentration allows for a more compact system design that is best
expressed in a small plant footprint. The membrane process does have weaknesses, one
of which is a low tolerance to large inert solids and abrasive grit, oil and grease. These
constituents tend to foul and degrade the membranes. Because of this the manufacturer
mandates fine screening prior to the membrane zones.
Due to the regulatory constraints on the plant, the system is designed with online
turbidity monitoring.
If you review the plant schematic in the appendix you will notice that the system
has two trains. Each train has pre and post anoxic zones, aeration zones, recycle loops
and chemical addition. These zones create a process that allows the mixed liquor to
nitrify the influent biomass, then denitrify before being processed by the membrane
system.
The first phase of the plant will be capable of treating .025 million gallons per day
(MGD) of influent wastewater. This plant is designed to easily be modified to treat an
additional 0.25 MGD by the addition of more membrane units and converting the aerobic
digester to an additional Pre aeration basin.
The kinetics of the system are described in the Basis For Design. All
operators responsible for operating and maintaining the MBR system should be familiar
with this information.
Targets values for air addition and chemical dosing to effluent quality on a
mathematical basis are listed in the appendix of the Basis For Design (Tab H). These
values are based on kinetic mathematics and a computer model of the system. The
2

calculations are based on past experience with membrane systems and reflect reasonable
targets for normal operation. In reality the plant may run better with slightly different
levels of chemical and air addition. Only experience with this plant can tell how accurate
the calculated rates are.
To aid in operating the plant, the manufacturer has provided user interface
software and a SCADA system and for controlling and monitoring the plant operations.
The system can be operated by an onsite PC in the main control room or by offsite PC via
modem access. These tools are invaluable for recording and analyzing plant operations.
They do not, however, eliminate the need for the operator to be familiar with the plant on
a daily basis.
The PHWWTF disposes its effluent in two high rate infiltration basins located
adjacent to the plant. These basins infiltrate the effluent and require an outstanding and
consistent effluent quality to assure that infiltration remains constant over time.
In order to remove the interference with groundwater, the basins are surrounded
by a groundwater lowering device in the form of an under drain. This under drain flows
to a surplus ground water impoundment. This impoundment can be used to store ground
water for distribution to customers and is designed with an overflow which directs excess
water to a level spreader. The level spreader directs the excess ground water to wetlands
by sheet flow.
2.0 SAFETY AND HEALTH
In the course of operating the PHWWTF all OSHA and NC Department of Labor
practices are to be followed. At no time should the staff perform tasks which violate
normal safety standards for the industry. Personal protective equipment (PPE) should be
worn at all times when indicated by industry standards and North Carolina Department of
Labor requirements. PPE should include but not be limited to safety glasses, hearing
protection, chemical face shields, goggles, gloves and steel toed boots.
The plans for the system should be reviewed in detail by the staff. Sheet C6.0
(included in the appendix) of the plans shows the locations of fire extinguishers, eyewash
stations, and self contained breathing apparatus. The staff should be trained in the use of
all safety equipment and devices. This involves actual field training in the use of all
safety equipment.
Section 12 of the specifications labeled "Project Specifications" contains several
MSDS documents for various chemicals used in the plant. The staff should collect and
maintain an updated catalog of MSDS documentation for every chemical on plant
property. Multiple copies of the catalog should be kept on site for quick reference in the
case of an emergency. All staff should have knowledge and understanding of the MSDS
catalog and all other safety manuals and plans.
It is advisable that all plant staff be inoculated for various communicable diseases
associated with wastewater and human waste products. Staff should consult with a
physician to understand and manage their exposure to these diseases.
In addition, the plant staff should develop and maintain all standard safety practices
and plans such as spill prevention, lock -out tag -out, and confined space entry plans.
3

3.0 AERATED EQUALIZATION
Plant influent will be directed to an aerated equalization basin. This is an above
ground steel tank. The influent line deposits water into a static screen and then that water
flows into the basin. The basin is outfitted with diffusers to mix the tank and keep the
influent from becoming septic.
Two pumps send water from the basin to the fine screens. These pumps operate off
of the level in the equalization basin and are sized to deliver a steady flow to the plant.
3.1 Daily Tasks for the Aerated Equalization Basin
Observe the diffused air patterns in the tanks surface. Any large
concentrations of turbulence or any areas that are lacking in turbulence
can be a sign of air line leaking or diffuser clogging. The operator
should look at these patterns at least once a shift. After several
observations of a normal pattern it will be evident if the pattern
changes and this will signal a need for maintenance to the operator.
Verfify that both pumps are operational by toggling them on and off.
The static screen should be inspected at the beginning and end of every
shift and raked as required. All debris should be disposed of properly.
The blowers supplying air to the tank should be examined for proper
operation. The sound of the blowers should be consistent day after
day. A different noise pattern or volume can be a sign of a problem.
Follow all of the manufacturer's guidelines for blower maintenance
and lubrication.
4.0 INFLUENT SCREENING
The PHWWTF has two Vulcan Rotary Drum Fine Screens. These screens receive
flow from the odor control wet well and remove large solids exceeding 2mm in size. The
screens discharge by gravity to Equalization/Anoxic zone in the MBR plant. The screens
are outfitted with an automatic compacter and washing system.
The screens are the first defense for the plant and are a possible bottleneck if not
maintained. The screens should be visited at least twice per shift and cleaned manually
as needed.
In all cases the staff should refer to the O & M manual supplied from the
manufacturer.
4.1 Daily Tasks for Screens
Inspect the screens at least twice per shift.
Inspect the washing press and empty the dumpster as needed.
0

Inspect the screen pad and drain and remove any buildup of grit or
other solids.
Check the control panel and all parts for normal function.
Refer to the manufacturer's O&M manual for any other required
tasks.
5.0 EQUALIZATION/ANOXIC ZONE
The Equalization/Anoxic Zone (EQ/ANOX) receives flow from the rotary drum
screens, the denitrification gravity recycle loop and the return activated sludge (RAS)
recycle loop. The zone is equipped with two mixers. The mixer assures that the solids
do not settle out and the influent to the zone is dispersed evenly.
The mixers will produce eddies and currents in the tank. If the flow patterns appear
different the mixer may be fouled. Follow the manufacturer's recommendations for
normal maintenance and operation of the mixers.
The level in the EQ/ANOX zone is controlled by two feed forward pumps. The
pumps are operated by variable frequency drives (VFD) that are activated by the plants
computerized control system. These pumps keep the level of the basin lower than the rest
of the zones in the common wall tank structure to allow for the gravity recycle loops to
work correctly.
5.1 Daily Tasks for the Anaerobic Zone
• Inspect the mixer apparatus and general mixing of the tank.
• If the eddies or flow around the tank are abnormal the mixer may
be pulled up and checked for propeller fouling or damage.
• Refer to the mixer manufacturer's literature for normal O&M tasks
and guidelines.
• Toggle the pumps and check for normal operation every shift.
• Visually compare the level in the tank with the reported level given
by the control software to assure that the level sensor is
functioning properly.
6.0 PRE AERATION ZONES
There are two Pre Aeration (PA) Zones in the MBR plant. These zones are aerated
with a diffuser system fed by one blower located in the control room. The blower feeds
into a common air header with the blower for the aerobic digester allowing for the
digester blower to be utilized as a spare in the case of a breakdown or malfunction.
The zones are equipped with a pH monitoring and dissolved oxygen sensors.
These devices feed data to the software provided by Ovivo and help control the aeration
system.
These devices are great tools but need to be calibrated and checked regularly. The
staff should check the pH and dissolved oxygen level in the basin with a handheld meter

once per shift. If the values from the handheld units differ greatly from the online
systems, the systems may need calibration or other maintenance. Follow all
manufacturers' recommendations for operations and maintenance.
The staff should observe the pattern of bubbles at the surface of the zones for normal
operation. Large bubbles or upwelling of mixed liquor or uneven dispersion may indicate
malfunctioning or damaged diffusers.
The operations staff should run bench tests every shift to check the level of mixed
liquor suspended solids (MLSS) in the PA zones. This level should be compared with the
target level of suspended solids for the plant.
Every shift the surface of the aerobic zones should be examined for foam. Due to the
aeration process some limited foaming is expected but excess of foam, light colored foam
or large amounts of floating solids can indicate an excess of air in the zones. The target
dissolved oxygen level in the aerobic zones is 1 ppm. It is important to note that this
value indicates a "residual" of oxygen in the zone. The biological processes are using
less air than is being supplied and so there remains "extra" dissolved oxygen. I ppm is a
target. The plant may run better at different dissolved oxygen levels at different times of
the year. Experience must guide the long term target for dissolved oxygen.
As with the equalization basin, the Pre Aeration zones feed flow to a tank that
requires a low dissolved oxygen concentration. For this reason, the target dissolved
oxygen concentration should not be exceeded if possible.
The calculations included in the Basis For Design are based upon a dissolved
oxygen concentration of 2 ppm in the PA zones. At the design flow of .25 MGD this
concentration requires the addition of a carbon source to help in the reduction of
nutrients. In the case of this plant the carbon source of choice is Micro-C. Micro-C is a
relatively safe chemical, but it is expensive. By limiting the dissolved oxygen
concentration to I ppm in the Pre Aeration zones the need for additional carbon is greatly
reduced. It is for this reason that the dissolved oxygen concentration in the PA zones be
closely monitored and tightly controlled. Once again it is important to note that the
amount of air supplied to the zones will vary with temperature and will most likely be
adjusted through the year.
The MBR control system adjusts the air supply to the zones automatically by
feedback through the dissolved oxygen sensors. Automatic controls such as this are
excellent for controlling biological processes but should be maintained and monitored
continuously. The operations staff should be well versed in calibrating and maintaining
the dissolved oxygen sensors as well as a backup handheld probe used to verify the
sensor readings.
In order to control total phosphorus in the plant effluent alum is injected in the
two PA zones. The chemical is added via metering pumps and is regulated by the
operator. The Basis For Design designates the suggested rates for the addition of alum
the design flow of 0.25 MGD. If the flow is less than the design flow then the dosing
rates will have to be adjusted accordingly. As with most things, it is likely that the
operator will use the recommended targets for dosing to start and fine tune the feed as
time goes by.
Section 27 of the specifications refers to an MSDS for Alum. All safety
procedures for chemical handling and storage should be strictly adhered to.
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6.1 Daily Tasks for the Pre Aeration Basin
• Twice per shift the dissolved oxygen and pH levels should be
measured using a handheld meter. The results should be recorded and
compared with the online sensors.
• Bench tests for MLSS should be performed every shift with results
recorded in the plant log.
• The amount and color of foam or scum on the surface of the Pre
Aerobic zones should be noted. Abnormal conditions should be
investigated with concern to available food source, dissolved oxygen
content, and microbial content.
• The PA zones should be inspected for uniform patterns in the surface
bubbles from the diffuser system. Non -uniform or irregular patterns
may indicate an inoperable or damaged diffuser.
• Use a hose to break up zoogleal slime from all devices and tank walls
as well as any bulking solids.
• Inspect all chemical feed equipment at least once per shift. Due to the
nature of the chemicals being dosed, equipment leaks, and failures are
to be periodically expected. Repair all leaks and seal failures
immediately. It is prudent to keep a running supply of spare pumps
and parts for all chemical dosing systems.
• Observe the liquid levels in all chemical drums or totes to prevent the
pumps from running dry and to assure that the dosing rates are
consistent.
• Assess the need to order more chemicals if necessary on a weekly
basis.
7.0 POST ANOXIC ZONE
7.1 The Post Anoxic (PAN) zone receives flow from the PA zones and is the last
treatment zone prior to the membrane units. The zone is mixed with two submersible
mixers as in the EQ/ANOX zone.
Flow to the PAN zone from the PA zones is through submerged valves with
extended operators. This configuration allows downflow in the PA zones and upflow
through the PAN zone and reduces the chances of short circuiting in the plant.
The addition of Micro-C, a methanol substitute, aids in the treatment process in
the PAN zone. The chemical is added via metering pumps and is regulated by the
operator. The target feed for Micro-C is designated in the Basis For Design. If the flow
is less than the design flow then the dosing rates will have to be adjusted accordingly. As
with most things, it is likely that the operator will use the recommended targets for dosing
to start and fine tune the feeds as time goes by.
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Section 27 of the specifications refers to an MSDS for Micro-C. Micro-C was
chosen because it has less safety concerns than methanol. All safety procedures for
chemical handling and storage should be strictly adhered to.
7.2 Daily Tasks for the Post Anoxic Zone
• Inspect the mixer apparatus and general mixing of the tank.
• If the eddies or flow around the tank are abnormal the mixer may
be pulled up and checked for propeller fouling or damage.
• Refer to the mixer manufacturer's literature for normal O&M tasks
and guidelines.
• Inspect all chemical feed equipment at least once per shift. Due to
the nature of the chemicals being dosed, equipment leaks, and
failures are to be periodically expected. Repair all leaks and seal
failures immediately. It is prudent to keep a running supply of
spare pumps and parts for all chemical dosing systems.
• Observe the liquid levels in all chemical drums or totes to prevent
the pumps from running dry and to assure that the dosing rates are
consistent.
• Assess the need to order more chemicals if necessary on a weekly
basis.
• Remove all zoogleal slime deposits from equipment with a hose on
a daily basis.
8.0 MEMBRANE SYSTEM
8.1 Ovivo has a complete Operations and Maintenance manual for the membrane
system, control panel and permeate equipment. Refer to this manual when operating or
maintaining any part of the Ovivo system.
The membranes have the capacity to be cleaned by backwashing with sodium
hypochlorite. The frequency of the cleanings may change depending on flow and other
parameters. Follow all the manufacturer's guidelines for cleaning the membranes.
Unlike the other chemical addition equipment, sodium hypochlorite is delivered
by a chemical ejection system. This system is driven by flow from the Wash Water Lift
Station pumps. Chemical is added manually by connecting a polypropylene tube to the
drum inlet and opening the valves for the membrane permeate headers.
This process is important to the maintenance of the membrane system and should
be practiced and thoroughly understood during the plant start up process.
The plant staff needs to be aware of the amount of chemical needed and place
orders for additional material in a prompt manner. Records of the date and the amount of
chemical used should be kept for budgeting and planning purposes.
Since the cleaning of the membranes is most likely a biannual exercise, a drum of
sodium hypochlorite should be stored outside the control room and out of sunlight until
needed.
E

The membrane tanks are aerated using a dedicated blower for each zone. The
staff should inspect all blowers daily and follow manufacturer's guidelines for routine
maintenance such as oil changes and lubrication.
The membrane tanks are fed by two slide gates from the PAN zone. These gates
should be maintained as per the manufacturer's requirements.
In order to remove permeate form the MBR zones each zone has a dedicated
permeate pump located in the equipment room. These pumps are controlled by the
plant's operation software.
A rescreening/wasting pump is located in the corner of each MBR zone. These
pumps send mixed liquor back to the screens or to the aerobic digestor when it is time to
waste. These pumps should be inspected to verify that they are not clogged. This can be
done by turning the valves in the plumbing to direct sludge to the aerobic digestor and
then observing the end of the line as it exits into the tank.
8.2 Daily tasks for the Membrane System
• Check all permeate lines for leaks daily.
• Observe and record the usage of sodium hypochlorite upon use.
• Change the oil and lubricate all compressors per the manufacturer's
specifications.
• Follow all prescribed practices for operating all membrane related
equipment.
• Observe the membrane tanks and note the pattern of air bubbles on the
surface of the tank. Odd patterns in the tank surface or a preponderance of
foam may be cause to change the blower VFD settings or repair the
blowers if not functioning correctly.
• Exercise and clean the slide gates to assure proper operation.
• Inspect the permeate pumps for proper operation and toggle all pumps
each shift.
• Verify that the rescreening/wasting pumps are functioning properly.
9.0 RAS AND DENITRIFICATION RECYCLE LOOPS
9.1 The RAS and denitrification recycle loops return RAS and mixed liquor to the
EQ/ANOX zone by gravity flow. These loops consist of telescoping valves and
subsurface lines that daylight in the EQ/ANOX zone. The outlets for these loops should
be visually inspected daily to assure consistent flow. These loops allow the plant to
remove nitrogen from the effluent. If they are not working properly then the plant
effluent will not be within its permitted limits.
The denitrification loop starts at the telescoping valve in the PAN zone. The
outlet is a 10 inch pipe in the EQ/ANOX zone. The required flow for this loop is IQ or
.25 MGD (175gpm) at the influent design flow
The RAS loop starts at ends of the MBR zones in two telescoping valves. The
loop terminates in a 16 inch pipe outlet in the EQ/ANOX zone (lower and closer to the
6

end wall than the denitrification loop). The required flow for this loop is 5Q or 1.25
MGD (868 gpm) at the influent design flow of .25 MGD.
9.2 Daily Tasks for the RAS and Denitrification Recycle Loops
The operator should inspect the outfall of the loops on a daily basis to
check for consistent day to day flows. My measuring the depth of the
stream from the pipe invert it is possible to estimate the flow. These loops
should not be adjusted unless major increases or decreases in flow are seen
over a prolonged time. In most cases a higher recycle rate is not
detrimental to plant operations. The rate can be adjusted by the
perspective levels of the telescoping valves.
10.0 WASH WATER LIFT STATION/ ISCO SAMPLER
10.1 The Wash Water Lift Station allows effluent to be directed to the two
infiltration basins via gravity flow through a 12 inch outlet pipe. The valve vault is
equipped with an aluminum hatch for easy access.
The Wash Water Lift Station is also the source of the water used to wash the
rotary drum screens and the compactors. This same line also feeds the chemical cleaning
ejectors for membrane cleaning. The station has two submersible pumps which feed a 3
inch line. This line is equipped with a bladder tank to prevent water hammer. The
pumps are operated by a pressure switch and duplex control panel. The pumps are
activated when the line pressure is less that 55 psi and shut off at 65 psi. The bladder
tank is located inside the control room adjacent to the lift station.
This Wash Water Lift Station should be the first stop on a plant tour for each
shift. The staff should take a grab sample of the effluent in a clean clear glass beaker and
observe the effluent. Care should be taken to examine the effluent under similar light
conditions every day. For this reason, the sample should be examined in the laboratory
area under consistent lighting circumstances. When operated properly the plant effluent
should be clear, free from particulate or flock. The effluent should not have a strong
odor.
The wet well is the location of the inlet for the composite sampler. This device is
used to take the required samples such as BOD5 to meet regulatory requirements. The
sampler refrigerates the samples to preserve them. The manufacturer's literature
describes the operation and care of the unit.
10.2 Daily Tasks for the Wash Water Lift Station
All manufacturer recommendations for the duplex pumps and bladder tank
should be followed. These components should be checked daily for
proper operation.
Bladder tanks are called such due to a bladder filled with air inside the
tank. This bladder should be at a pressure equal to that of the pump off
pressure. If the pressure is less or if the bladder is compromised and the
10

tank gets waterlogged, the submersible pumps in the station will cycle
constantly and water hammer is likely to occur. Water hammer can be
destructive to valves and other components and causes these parts to wear
much more rapidly then under normal use. In order to check the pressure
of the bladder it is suggested that the operator periodically turn off the
pumps and allow the line pressure to go to zero. The bladder pressure can
then be read with a tire gage. If the pressure is low then air should be
added to the bladder.
11.0 INFILTRATION BASINS
11.1 The infiltration basins designed for the disposal of the effluent are very
important to the overall operation of the PHWWTF. If the basins fail to infiltrate the
effluent then the plant would be limited in allowable flow. It is important to keep trash,
garbage and other debris from the basins. The side slopes should be maintained and
vegetated to the waterline. This does not include the side slopes of the center berm area.
Grass clippings and other organic material should be removed and not allowed to enter
the basins. At no time should trees or bushes be planted on the inside slopes of the basins
or down the center dividing berm.
The basins each have a flow meter prior to the basin inlet. These meters should
be read and recorded daily. In addition, both basins have staff gauges to visually detect
the level of the basins. These level readings should be taken daily and compared with to
the previous day's readings.
The basins are surrounded by a groundwater lowering device. This under drain
enhances infiltration by removing groundwater from around the basins. The under drain
has manholes at each vertices. These manholes are for inspection of the under drain. If a
problem is suspected in the under drain system then the pipes can be accessed and
televised using these manholes.
The center berm of the two basins is constructed of an engineered fill material.
The material should be inspected daily for erosion and rills. Any weeds or other growth
on the side slopes should be removed on a monthly basis at a minimum. The side slopes
of this material are not to be seeded with any ground cover. Vehicular traffic on the
material should be prohibited at all times.
12.0 AEROBIC DIGESTER
12.1 The Aerobic Digester is sized to hold in excess of 30 days of residuals from
the biological process. The waste activated sludge (WAS) is sent to the digester by
opening the WAS valve and allowing the WAS to flow into the basin. The WAS valve is
submerged and located in the common wall between the PAN zone and the Digester
zone.
11

When starting to waste the aeration/ mixing system should be running. The
aeration/mixing system should stay running until the system is shut down to allow the
digester to settle. Depending on the amount of solids in the tank and the quality of those
solids it may take several hours for the solids to have settled. The operator should
visually inspect the digester to determine how much the solids have settled.
The layer of solids below the clear liquid in a tank with settled solids is usually
referred to as a blanket. The clear liquid is called supernatant. The goal of dewatering
the digester is to remove the supernatant without upsetting the blanket. The process of
removing supernatant is called decanting.
Decanting removes liquid with a low concentration of solids and allows for the
remaining liquid to have a higher concentration. This process is called thickening.
Supernatant can be removed by using a portable trash pump to pump from the
digester to the aerated equalization basin.
The digester is aerated and mixed with blowers and medium bubble diffusers.
Care and maintenance of this assembly should follow the guidelines laid out in the
Manufacturer's Operations and Maintenance manual.
The processes described above are key to the operation of the PHWWTP. If
wasting is not performed often and properly then the biological makeup of the mixed
liquor of the plant may be affected and the plant could experience an upset.
The liquid in the digester should not be thickened to a MLSS concentration
greater than 4%. Between 4% and 6% the solids will become to viscous to remove with a
vacuum truck. Solids should be removed from the digester and disposed of by a licensed
contract hauler.
13.0 GROUNDWATER IMPOUNDMENT
13.1 The groundwater impoundment is located in the rear of the project and
consists of an earthen basin a surplus groundwater lift station and a
hydropneumatics tank. NCDEQ has stipulated that at no time shall any
impounded groundwater exceed a level such that the freeboard is less than one
(1) foot. This impoundment is owned by a separate entity but operated under
contract by Pluris Hampstead, LLC. In order to assure the freeboard
requirement, the operators shall utilize the following techniques for surplus
groundwater use:
a. Irrigation of surrounding uplands.
b. Habitat creation via wetland augmentation or created wetland areas.
c. Irrigation of medians and shoulders of rights of way.
d. Natural infiltration in the impoundment itself.
e. Used for amenity ponds.
f. Vehicle washing.
g. Irrigation of non-food crops.
h. Fire suppression systems.
12

The maintenance of the groundwater impoundment pond includes typical erosion
control and mowing of all side slopes and grassed areas around the impoundment. In
addition, the impoundment pond lift station shall be inspected for proper operation.
The impoundment pond will also be used as a source for surplus groundwater for
the surrounding community, reducing stress on subsurface aquifers for potable water.
The surplus groundwater impoundment pond existing lift station and hydropneumatic
provide for water to be delivered to community distribution network(s) by others. The
lift station and hydropneumatic tank operation and maintenance program mirrors that of
typical sanitary sewerage lift stations.
13.2 Daily Tasks for the Groundwater Impoundment
• The operator should walk the entire perimeter of the impoundment daily
and inspect all side slopes and graded areas for signs of erosion.
• All rills and or channeled areas should be filled seeded and repaired
immediately to prevent erosion.
• Grassed areas are to be maintained at a height of no more than 12 inches
and overseeded as needed to assure a robust ground cover.
• The lift station will be inspected for proper operation periodically
including pumping capacity and correct control panel operations. The
hydropneumatics tank will be inspected as required by statute for pressure
vessels.
• The level of the impoundment shall be recorded using the level gage
attached to the lift station wet well.
14.0 EMERGENCY GENERATOR AND AUTOMATIC TRANSFER SWITCH
13.1 In order to satisfy the reliability requirements set out in Title 15A T2 rules
the plant is equipped with an emergency standby generator and automatic transfer switch
(ATS). The generator is activated in the case of a power failure, loss of a phase or other
electrical anomaly. At the time of the outage, the generator is started automatically and
after a brief period, the transfer switch switches the plant to generator power. After
power is restored, the generator and switch automatically switch the plant back to normal
service.
The generator and ATS should be tested under load at least once per week.
Follow the manufacturer's guidelines for testing of the system.
The manufacturer's O and M manual specifies the periodic maintenance and
operation of the system. Only qualified personnel should perform maintenance or make
repairs to the generator and transfer switch.
13.2 Tasks for the Emergency Generator and Automatic Transfer Switch
13

Check the fuel level weekly. It is important not to let the fuel in
the generator tank get to old. The generator needs to be exercised
regularly and fresh fuel should be added as needed. In most
instances, the generator will only be required to run for short
periods of time. In the event of an imminent long term power
disruption, such as a hurricane, the fuel tank should be filled with
reserve fuel on hand.
15.0 LANDSCAPING AND PAINTING
14.1 An important part of the maintenance of any facility is the upkeep of the
grounds and surrounding area. It is important that the landscaping and grass be kept
trimmed and neat in appearance.
The plans for the facility require that exposed ferrous piping and carbon steel be
coated with Tnemec products. To avoid corrosion and ultimate component failure, all
ferrous metal parts should be scraped sanded and painted to maintain their integrity. It is
not uncommon for a maintenance team to have an ongoing schedule of painting tasks
throughout the plant. Staff should plan to visit all painted components at least yearly to
paint or retouch areas that show wear, rust or other corrosion.
16.0 PERMIT REVIEW
15.1 It is imperative that the operators of the PHWWTF be thoroughly and
completely familiar with all aspects, provisions and requirements of the operating permit.
The permit is an agreement between the owner of the facility and the State of North
Carolina as to how the facility will be operated and maintained. The permit specifies the
characteristics of the effluent, sampling parameters and frequencies and responsibilities
for reporting.
A copy of the permit should be on display or available in the plant office at all
times. The permit is often used as a reference and needs to be renewed periodically. The
staff should pay close to every provision and contact a local NCDEQ official with any
questions or clarifications on any part of the permit.
II. SAFETY MEASURES AND RESTRICTED ACCESS
1.0 OSHA AND THE NORTH CAROLINA DEPTARTMENT OF LABOR
1.1 All personnel should at all times follow the guidelines and most recent
revisions to all OSHA regulations and the rules and regulations of the North Carolina
Department of Labor. This document defers to these agencies in all matters of safety and
14

creating a safe work environment. All personnel should be familiar with all applicable
rules, regulations and standards for safe work practices and behaviors. All required
placards and employee notifications shall be posted in a location or locations so that all
employees receive notification as required.
All operations, maintenance staff and any other associated personnel shall follow
all industry standard practices for wastewater treatment plant operations, maintenance
and emergency response.
The utility system manager shall be responsible for all aspects of creating and
maintaining a safe work environment. This includes the preparation and updating of all
required safety, and emergency response plans.
2.0 LOCK OUT/ TAG OUT
2.1 For the safe operation and maintenance of all energized systems the utility
should develop the required program for isolation and verification of de -energized
components and devices commonly referred to as a Lock Out/Tag Out program.
Such a program shall require the evaluation of any and all systems that are
energized with electrical current and/or fluid pressure. The program shall identify all
components in a given system, points of isolation such as valves, switch gear circuit
breakers, disconnects, mechanical unions, and methods of securing the said system
against accidental energizing. Any personnel required to maintain or operate any part of
such a system shall be trained to implement the required Lock Out/Tag Out plan.
All personnel maintaining and or repairing electrical equipment or systems shall
be properly licensed and experienced to do so.
3.0 CONFINED SPACE ENTRY
3.1 The utility system manager shall insure that a Confined Space Entry plan is in
place for the facility. This plan shall outline the methods of safely accessing spaces that
are not designed to be readily accessed and meet the criteria of a confined space as
outlined by OSHA, the North Carolina Department of Labor and industry standards.
The utility system shall have any and all equipment including personal protective
equipment (PPE), self-contained breathing apparatus (SCBA), harnesses, lifts, safety
lines and any other equipment required for the safe entry of any confined space at the
plant.
All personnel who shall have an occasion to enter any confined space shall
receive training and be familiar with the standards and practices of confined space entry
as outlined by the required plan, industry standards and all applicable regulations.
4.0 MANUFACTURER'S SAFETY DATA SHEETS (MSDS)
4.1 The utility system manager shall retain a catalog of all MSDS sheets for all
chemical compounds used in the operations and maintenance of the system. The catalog
15

shall be available to all personnel with at least one copy in the manager's office and one
copy in the plant control room.
These catalogs are to be made available to all plant personnel and shall be labeled
"MSDS" and be in plain sight and readily accessible.
5.0 OPERATOR IN RESPONSIBLE CHARGE (ORC) AND BACK UP ORC (BORC)
CREDENTIALS
5.1 The utility system manager shall employ an operator in responsible charge
(ORC) with a current North Carolina Grade IV biological wastewater treatment plant
operator's license. The ORC will be responsible for the daily operations of the plant as
well as all aspects of reporting plat operations to NCDEQ as required by the system
permit.
The ORC shall direct the operations staff and maintenance crews. The ORC shall
be responsible for notification of the utility system manager, NCDEQ staff, and any
applicable federal, state or municipal authority in the case of a permit violation, accident,
spill, bypass or any incident requiring any such notification.
The ORC shall receive continuing education as required by conditions of
licensure to facilitate professional growth and competence in the field of biological
wastewater treatment.
The utility system manager shall employ a back-up operator (BORC) with a
current Grade III biological wastewater treatment license to act as ORC in the ORC's
absence. The BORC shall work with the ORC and be completely familiar with all
aspects of plant operations and maintenance.
The BORC shall receive continuing education as required by conditions of
licensure to facilitate professional growth and competence in the field of biological
wastewater treatment.
6.0 MAINTENANCE CREW MEMBERS, COMMUNICATIONS, AND
CREDENTIALS
6.1 All maintenance crew members either under direct employment of the utility
system manager or acting as subcontractors shall be qualified to do such work as required
by normal industry standards. All maintenance crews shall be compromised of at least
(2) two persons and equipped with radios, cellular phones or other communications
devices with the ability to contact emergency response personnel.
All maintenance crew members shall be trained in all aspects of safety as pertains
to any and all work they are expected to perform. This includes training in confined
space entry, lock out/tag out and safe handling of chemicals.
Any maintenance crew member working on any electrical system should be
licensed or under the direct supervision of a licensed electrician as required by laws and
statutes of the State of North Carolina.
7.0 SAFETY MEETINGS, CONTINUING EDUCATION
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7.1 All personnel including the utility system manager, the ORC and BORC and
maintenance crew members and any other applicable staff shall receive training for
creating a safe work environment. This may include but not be limited to regularly
scheduled safety meetings, on site or off site vendor training sessions, and continuing
education regarding safe working practices.
All personnel shall be responsible for maintaining documentation showing the
completion of all required continuing education for their position. The utility system
manager shall keep a copy of all records of staff continuing education events, training
events and safety meetings including continuing education credits earned and staff
attendance.
8.0 SITE ACCESS, CONTROL SYSTEM ACCESS
8.1 The site will be limited to access by authorized personnel only. The plant is
accessed through a security gate and the property is fenced. No access of unauthorized
personnel shall be allowed. All visitors shall be required to register at the utility office
and a sign requiring such is posted.
All personnel are required to report any unauthorized access to the utility system
manager immediately.
All electrical equipment panels, sumps, wet wells, control panels and valve vaults
shall be equipped with mechanisms to prevent entry by unauthorized personnel. Access
to these areas shall be limited to authorized personnel at the discretion of the utility
system manager and the ORC.
III. SPILL CONTROL, EMERGENCY RESPONSE,
EMERGENCY CONTACT INFORMATION
1.0 Spill Control
1.1 Due to the design and siting of the Pluris Hampstead Wastewater Treatment
plant it is unlikely that a spill of wastewater would reach surface waters. This does not
mean that spills are acceptable. In most cases plant infrastructure is located adjacent to
large impoundments or lagoons or located on very flat land with hundreds of feet of
buffer between plant components and surface waters, wetlands or property lines.
That said there should be no tolerance for spills. Any spill or release of
wastewater to an undesirable location due to mechanical failure, operator oversight or
other reasons should be treated with the utmost urgency. Any such incidence should be
reported to NCDEQ as required by the system permit.
In the event of a spill the following steps should be followed to assess, report and
correct the situation in a timely manner.
1. Upon notification or discovery of a spill plant personnel should immediately
notify the ORC (or BORC if the ORC is not present) and the utility system
17

manager. The utility system manager should immediately assess the situation as to
the type of spill, the magnitude of the spill in approximate gallons of wastewater
spilled and possible corrective actions. The utility system manager should
immediately contact NCDEQ personnel by phone to report the spill, the
approximate number of gallons and the timeline for corrective action.
2. The utility system manager should update NCDEQ personnel as the corrective
action proceeds. The utility system manager or plant personnel should document
the spill using digital photographs or video that can be texted or emailed to
NCDEQ for their evaluation. This documentation should continue from the
discovery of the incident to the completion of any and all repairs.
3. The utility system manager should maintain a log of personnel involved in the
corrective action, materials used, and steps taken to prevent future spills.
4. All soil areas that are impacted by a spill of wastewater should be treated with
quick lime to facilitate disinfection of the area.
5. In the case of a spill or bypass where wastewater enters the high rate infiltration
(HRI) basins or the ground water impoundment all discharge of effluent or
groundwater to those areas should immediately be halted. The discharge of
effluent to the HRI basins should not proceed until bacteriological tests indicated
a suitable level of fecal coliform in the basin coincident with or lower than the
permit limit.
6. In the unlikely event of wastewater reaching adjacent surface waters to the plant
the spill should be assessed as to how far downstream sludge or solids have
entered the stream. In the case of such an event the utility system manager should
consult on site with the NCDEQ staff as to the methods to best clean up the spill.
The primary objective in such an incidence should be to stop the flow of
wastewater to the surface waters. After the flow has been stopped corrective
measures for cleaning the stream or wetlands can be evaluated. The utility system
manager should have on hand absorbent booms, quick lime, skimmers and other
materials for immediate cleanup of spills. The utility manager should also have
on hand or by contract, the ability to pump sludge and wastewater from a spill
area by vacuum truck.
7. In the event of an excessive rain event like a hurricane or tropical storm, the utility
system manager and ORC should work to maintain the appropriate level of free board
in all basins and impoundments to prevent overtopping due to the storm event.
8. Upon completion of the repairs and corrective actions the utility system manager
should document the incident with digital photographs of the affected areas.
2.0 EMERGENCY RESPONSE and CONTACT INFORMAION
2.1 In the case of an emergency please review the list of contact information
below. Please note that in all cases the utility system manager and ORC should be
notified of any and all emergencies at the earliest possible time. A log of all emergencies
including a timeline of notifications and affected personnel should be compiled and kept
on file by the utility system manager.
M

2.2 Medical Emergencies - All medical emergencies including accidents or any
event that threatens the life of any person related to the utility should be addressed
immediately. First responders should be notified by dialing 911 and reporting the event
to the Onslow County dispatcher.
2.3 Fire Emergencies - All emergencies regarding fires including structures,
brush, forest and vehicle fires should be immediately reported to the Onslow County
Dispatcher by dialing 911. All personnel should be trained in the use of fire
extinguishers.
2.4 Chemical Spills - All chemical spills should be reported to the proper
authorities based upon the chemical and the threshold amount. The MSDS sheet for the
specific chemicals involved should be consulted for the need of personal protective
equipment (PPE). If PPE is required and not on hand for the containment and cleanup of
a spill then the proper authorities should be contacted to do so. The use of such
chemicals at the plant is discouraged and the ORC and the utility system manager should
strive to use chemicals that do not pose a hazard to human health and in quantities that
are manageable.
2.5 Wastewater Spills or By Passes - All wastewater spills and by passes are to be
reported to the NCDEQ per the requirements of the system permit.
2.6 Contact Information
First Responders, Fire, Rescue 911
Utility System Manager, ORC 910-327-0374
NCDEQ, Wilmington Regional Office 910-796-7215
19

APPENDIX
I. PLANT SCHEMATIC
II. LIFE SAFETY PLAN
20

IV. GENERAL REQUIREMENTS — 15A NCAC 02T .0100 (continued):
8. What is the nearest 100-year flood elevation to the facility? 27 feet mean sea level. Source: Firm Panel 3262
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
MWI
Active
34.342590'
-77.7716'
Up Gradient
On Review Boundary
MW2
Active
34.343396'
-77.77148'
Down Gradient
On Review Boundary
MW3
Active
34.3433680
-77.771050
Down Gradient
On Review Boundary
MW4
Active
34.3412610
-77.771020
Down Gradient
Inside Review Boundary
Select
0-
0Select
Select
Select
0-
0Select
Select
Select
0-
0Select
Select
Select
0-
0Select
Select
Select
0-
0Select
Select
Select
0-
0Select
Select
a Provide the following latitude and longitude coordinate determination information:
Datum: NAD83 Level of accuracy: Nearest loth 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 Agreement (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. 143-215.6139 ❑ 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: HRIS 06-16 Page 3 of 13

101
&2S"
6.88'
0.69" 0.69"
SEWER
- o00
A A
FI�0.5"
7.25"
11.875"
PLAN
BOX
7"
6.69"DIA
D.125"
Ds" Ds°
0.5" 0.32" 0.5"
11 - 6.5"DIA
05 T SECTION "A -A"
z7s"
11 a8"
MINIMUM WEIGHTS:
EXTENSION TOP 10 LBS.
BOX 40 LBS.
EXTENSION 40 LBS.
NOTE:
VALVE BOX LID NOT FOR USE IN ROADWAY LOCATIONS.
HEAVY DUTY LID REQUIRED. SEE SD 14-09.
PSD NO. 12 - CAST IRON VALVE BOX DETAIL PSD NO. 15 -GATE VALVE DETAIL
NOT TO SCALE
NOT TO SCALE
PRE -AERATION 3
CURRENTLY USED AS A DIGESTER
WILL BE CONVERTED TO A PRE -AERATION BASIN
EXISTING GROUND— COMPACTED '/MODIIED PROCTOR
ALL SLIDE GATES VALVES DIFFUSERS AND OTHER
95% MODIFIED PROCTOR
IF UNDER PAVEMENT ACCESSORIES ARE IN PLACE.
SLOPE WALLS TO ANGLE OF
REPOSE OF SOIL OR AS
APPROVED BY THE ENGINEER
COMPACTED PIPE EMBEDMENT
TO 90% MODIFIED PROCTOR
CLASS I OR II MATERIAL
#57 STONE 6" DEEP MINIMUM
PIPE WIDTH +24", EX. COMMONWALL TA
TRENCH BOTTOM
NOTES:
I. MINIMUM BURY DEPTH FOR ALL FORCE MAINS AND GRAVITY LINES IS 36" UNLESS SPECIFICALLY
ALLOWED BY THE ENGINEER. ALL LINES SHALLOWER THAN 36" MUST GIVE CONSIDERATION TO
USING HIGHER PRESSURE AND THICKNESS CLASSES OF DIP.
2. ALL LINES TO BE BEDDED IN 6" OF #57 STONE MINIMUM. FOR LINES INSTALLED BELOW THE WATER
TABLE #S7 STONE SHOULD EXTEND TO THE SPRING LINE OF THE PIPE AT A MINIMUM.
3. THE USE OF 4S7 STONE BEDDING AND BACKFILL SHOULD BE COMMENSURATE WITH THE
CONDITIONS IN THE TRENCH. THE CONTRACTOR IS RESPONSIBLE FOR PROPER BEDDING AND
BACKFILUNG TO INSURE PIPE STABILITY AND UNIFORM GRADE.
PSD NO. 9 - PIPE TRENCH AND BEDDING DETAIL INSTALL
NOT TO SCALE NOTE: ALL AIR AND
UNDISTURBED
SOIL (fYP.)
PLAN -BENDS
45 \
18" MIN-10" DIA. OR LESS
24" MIN-12" DIA. OR GREATER
SECTION X-X
BENDS & TEES
X
,7
A A
X
PLAN -TEES
18" MIN. C F-24" MIN.,
ID" DIA. 12"0 & UP
& LESS
U
V �
C=PLAN
D=ELEVATION
PLAN &ELEVATION
PLUGS
000000�00000
ASSUME 2000 PSF SOIL (SAND & GRAVEL WITH CLAY)
NOTES
I. BASED ON 200 PSI STATIC PRESSURE PLUS AW WA WATER HAMMER ALLOWANCE.
7. ALL BEARING SURFACES TO BE CARRIED TO UNDISTURBED GROUND.
3. THRUST BLOCKS TO BE USED AT ALL LINES OPERATING UNDER PRESSURE.
4. CONCRETE SHALL NOT CONTACT BOLTS OR MECHANICAL FITTINGS.
5. CONCRETE SHALL BE 3000 PSI.
6. TRENCHES SHALL CONFORM WITH STANDARD EMBEDMENT DETAIL
7, ALL BENDS AND INTERSECTIONS SHALL HAVE CONCRETE THRUST BLOCKING.
& SEE STD. THRUST BLOCK SHEET 2 OF 4 FOR OTHER SOILS.
PSD NO. I - THRUST BLOCKING DETAIL
NOT TO SCALE
REACTION BEARING AREAS FOR HORIZONTAL WATER/SEWER PIPE BENDS
BASED ON TEST PRESSURE OF 200 P.S.I.
GIVE" IN s
��� v per^' 1871
r
x°
6"
II I/4
1,108
1
1
1
1
1
1
2
1
22 10
2,207
1
2
2
1
1
1
3
1
45 "
4,328
2
3
3
1
1
2
5
1
90"
7,996
2
4
5
1
1
2
8
1
PLUG
S,6S5
2
3
4
1
1
2
6
1
8.,
11114
1,970
I
I
1 2
1
1
1 I
1 2
I
221/2
3,922
1
2
3
1
1
1
4
1
45,
7,699
2
4
5
1
1
2
8
1
90,
14,215
4
8
9
2
2
4
IS
2
PLUG
10,053
3
5
6
2
2
3
10
1
12"
II 1/4
4,433
2
3
3
1
1
2
5
1
22 1 /2 "
8,826
3
5
6
2
2
3
9
1
45,
17,312
5
9
11
3
3
5
Is
2
90o
31,983
8
16
19
4
4
8
32
4
PLUG
22,619
6
12
14
3
3
6
23
3
16"
11 1/4
7,881
2
4
5
1
1
2
8
1
22 1/2 "
15,691
4
8
10
7
2
4
16
2
45 "
30,779
8
16
19
4
4
8
31
4
90o
56,861
IS
29
35
8
8
IS
57
6
PLUG
40,213
10
21
25
5
5
10
41
5
REACTION BEARING AREAS ARE IN SQUARE FEET MEASURED
IN A VERTICAL PLANE IN THE TRENCH SIDE AT AN ANGLE OF
99' TO THE THRUST VECTOR.
USE 6" - 90" BEND VALUE FOR HYDRANTS FOR ADDITIONAL
SAFETY FACTOR.
PSD NO.2 - THRUST BLOCKING DESIGN QUANTITY TABLE
NOT TO SCALE
SUMBERSIBLE WASTING/RESCREENING PUMPS
4" WASTING LINE ON TOP OF
SIDEWALK W/ HEAT TRACING HERE
EXISTING INFLUENT SETTLING TANK AND
ODOR CONTROL SKID TO BE
REMOVED FROM SERVICE
INSTALL 12" GATE VALVE
W/ SQ NUT OPER.
TAG 6.6
EX. CONTROL BUILDING
I VV 1 L. I 11%VI \.JJLL/ Z LII VL 1 \J UL I\\J%-J I LLJ
UNDER EXISTING HRI EFFLUENT LINE
MINIMUM SEPARATION 2 FEET
FM TO PROPOSED DIGESTER
I \4" C-900 WASTING LINE
I TAG 6.4
i
FM
(PROPOSED WASTING LINE
MINIMUM BURY DEPTH OF 3'
STARTING AFTER LINE LEAVES
EXISTING WALK HERE
NORTH
■■■■SCALE: I'll 101
Lf)
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0

TYPICAL FOR 3 TYPICAL FOR 3
c('AF)A
aiw
A lnn
FAIL
YA
500001
RUN REMOTE HIGH TEMP
YC
Y
TAH
500001
500001
500001
SCADA
0
DI
DI
PLC
I I
I ,
HS
�------ s0000l
HOR
I
I I
I
I I
MCC
I I
I
I I
I I
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----
PROCESS AIR
Z1 TOED-01
I I
REF SHT 1- 1.1
I I
5PG TTSH
0PRV-500001 0001500001
CHV-5000011I 5x4
V-500001
DIGESTER BASIN BLOWER 1 ® I
❑3
I
1
I BLR_500001 ® - -SOUND ENCLOSURE ® - -
1CD
CD
Sao
TT
IT' IT'
I>
--
-- -
PG TG TSH
1 PRV-500002 .O OHS 500002 SWWZ
�®
REVISED 6 - 9 - 21
®
L L— i� �
.,i-
FLIPPED EQ AND DIG. SINES
— — — — — —
4"-COMM
- �
CH V— 5000021 5x4
V— 500002
COMON STAND—BY BLOWER 2 ®
❑3
I OLR=500002 ® - -SOUND ENCLOSURE
- o
xEF
T�
31 T
I - - - '-
_ _ I
� PG TG TSH I
1 PRV-500003 �a0o3 s0aoa3 500003
CHV-5000031 5x4 V-500003
EQUALIZATION BASIN BLOWER 3 ® ❑3
I �
OLR-500003 ® SOUND ENCLOSURE
PROCESS AIR
IZ21 TO DIG-01
REF SHT 1-1.2
NOTES:
❑1 PIPING, FITTINGS AND ASSOCIATED HARDWARE SUPPLIED BY OTHERS.
❑2 ALL MANUAL VALVES AND ASSOCIATED FITTINGS SUPPLIED BY OTHERS.
❑3 SUPPLIED BY OTHERS. WORKMANSHIP STANDARD ES0001 APPLIES
® SUPPLIED BY OVIVO
❑5 FUTURE. *UNLESS OTHERWISE NOTED DO NOT SCALE DRAWINGS
EQ/DIG BLOWERS
FINAL DRAWING —FOR REVIEW PURPOSES ONLY —NOT RELEASED FOR CONSTRUCTION

vii. NSF STANDARD 14
viii. NSF STANDARD 61
ix. Note: Latest revision of each standard applies.
x. Refer to the manufacturer's suggested specification form Charlotte Pipe and
Foundry Company as meeting these standards. Pipe supplied shall be equal or
better to the materials included in Appendix I tab 5.
xi. Appendix Reference - Appendix I tab 4.
III. EQUIPMENT
1. PUMPS
Equalization Tank Pumps
i. Equalization Tank Pumps shall be Flygt np3102, 5 hp submersible pumps or
equivalent.
ii. Design Point: 450 gpm @ 20' TDH
iii. Appendix Reference - Appendix I tab 5.
b. Wasting/Rescreening Pumps
i. Wasting/Rescreening Pumps shall be Flygt NP3085, 2.2 hp submersible
pumps or equivalent.
ii. Operating Point — 26.5 gpm @ 16.9' TDH
iii. Appendix Reference - Appendix I tab 6.
2. BLOWERS
DIGESTER AND EQUALIZATION BLOWERS
i. Equalization Blower package shall be Aerzen GM 25S Delta positive
displacement rotary lobe blowers (or Kaeser equivalent) capable of producing
488 SCFM at a differential pressure of 5.7 psig.
ii. Digester Blower packages shall be Aerzen GM 30L Delta positive
displacement rotary lobe blowers (or Kaeser equivalent) capable of producing
785 SCFM at a differential pressure of 5.9 psig
iii. Appendix Reference - Appendix I tab 7.
3. EQ AND DIGESTER MEDIUM BUBBLE DIFFUSERS
a. Medium bubble diffusers shall be manufactured by Environmental Dynamics, Inc.
Equivalent products may be considered.
b. The digester diffuser system shall be capable of 40 scfm for 1000 cu ft of tank
volume based on mixing.
c. The equalization diffuser system shall be capable of 20 scfm for 1000 cu ft of tank
volume based on mixing.
d. Associated piping and hardware shall be as detailed in the manufacturer's literature.

PLURIS HAMPSTEAD WWTF PLANT EXPANSION CALCULATIONS
EQULIZATION AIR REQUIREMENTS AND STORAGE CALCULATIONS
TANK DIAMETER
64.37
FT
SIDEWALL HEIGHT
11.87
FT
FREE BOARD
2
FT
VOLUME
32,120
CU FT
VOLUME
240,257
GAL
AIR REQ. FOR MIXING
15
SCFM/1000 CU FT
AIR REQ
482
SCFM
AIR PROVIDED
488
SCFM AT 5.9

PLURIS HAMPSTEAD WWTF PLANT EXPANSION CALCULATIONS
AEROBIC DIGESTER MIXING AIR REQUIREMENTS AND STORAGE CALCULATIONS
TANK DIAMETER
50.38
FT
SIDEWALL HEIGHT
10.66
FT
FREE BOARD
2
FT
VOLUME
17,263
CU FT
VOLUME
129,130
GAL
WASTE SOLIDS
9952
GAL/DAY (8,000 PPM)
TARGET CONCENTRATION
2
% (AFETR THICKENING AND SETTLING, DECANTING)
DIGESTER STORAGE TIME REQ.
30.00
DAYS
TOTAL WASTED IN 30 DAYS
298,560
GAL
VOLUME AFTER THICKENING/DECANT
119,424
GAL
STORAGE TIME
32
DAYS
AIR REQ. FOR MIXING
40
SCFM/1000 CU FT
AIR REQ
690.53
SCFM
AIR PROVIDED
785
SCFM AT 5.9

PLURIS HAMPSTEAD WWTF PLANT EXPANSION CALCULATIONS
EQULIZATION PUMP SIZING CALCULATIONS
Q, ADF
0.5
MGD
Q, ADF
500,000
GPD
PEAK FACTOR
2.5
Q, PEAK
868.06
GPM
TRAGET FLOW
450
GPM
WATER ELE IN EQ
44.00
FT ELE
EQTANK MOSTLY EMPTY
HIGH POINT ELE
55.00
FT ELE
ELEVATION HEAD
11.00
FT
TOTAL ELEVATION HEAD
FM1 SIZE
4.00
IN
L, FM1
16.00
FT
INCLUDES EQ. LENGTH FOR VALVES ETC
Hf, FM1
1.70
FT
FRICTION HEAD FOR PUMP DISCHARGE
FM2 SIZE
6.00
IN
L, FM2
40.00
FT
INCLUDES EQ. LENGTH FOR VALVES ETC
Hf, FM2
0.58
FT
FRICTION HEAD IN 6" LINE
FM3 SIZE
12
IN
L, FM3
270
FT
INCLUDES EQ. LENGTH FOR VALVES ETC
Hf, FM3
0.14
FT
FRICTION HEAD FOR 12" LINE TO SCREENS
TOTAL FRICTION HEAD
2.42
FT
TOTAL FRICTION HEAD
TDH
13.42
FT
TOTAL DYNAMIC HEAD CACULATED
PUMP OPERATING POINT
TDH
20
FT
CONSERVATIVE BASED ON ABOVE
Q, PUMP
450
GPM

PLURIS HAMPSTEAD WWTF PLANT EXPANSION CALCULATIONS
WASTING/RESCREENING PUMP SIZING CALCULATIONS
TRAGET FLOW
75
GPM
WATER ELE IN EQ
44.50
FT ELE
HIGH POINT ELE
53.00
FT ELE
ELEVATION HEAD
8.50
FT
FM1 SIZE
4.00
IN
L, F M 1
500.00
FT
Hf, FM1
1.90
FT
TDH
10.40
FT
PUMP OPERATING POINT
TDH
15
FT
Q, PUMP
75
GPM
75 GPM - 3 PUMPS IN TOTAL
EQ TANK MOSTLY EMPTY
INCLUDES EQ. LENGTH FOR VALVES ETC -LONGEST RUN
FRICTION HEAD FOR PUMP DISCHARGE
TOTAL DYNAMIC HEAD CACULATED
CONSERVATIVE BASED ON ABOVE
(25 gpm FOR EACH PUMP)

PLURIS HAMPSTEAD WWTF PLANT EXPANSION CALCULATIONS
STATIC SCREEN CALCULATIONS
EXPECTED FLOW
1800
GPM
WORST CASE WITH BOTH UPSTREAM LIFTSTATIONS RUNNING
Q, INFLUENT CFS
4.01
CFS
FLOW IN CF/SEC
SCREEN WIDTH
3
FT
TARGET FLOW DEPTH
0.8
FT
Q, ALLOWABLE
7.15
CFS
ALLOWABLE FLOW BASED ON TARGET DEPTH, WIER EQUATION
FLOW VELOCITY THROUGH SCREEN
1.67
FT/S
BASED IN Q INFLUENT AND TARGET DEPTH
INLET PIPE FLOW VELOCITY
INLET PIPE ID
18
IN
AREA
1.77
SF
VEL
2.270
FPS
BASED ON PIPE AREA AND Q INFLUENT

PLURIS HAMPSTEAD WWTF PLANT EXPANSION CALCULATIONS
WASTING/RESCREENING PUMP SIZING CALCULATIONS
TRAGET FLOW
75
GPM
WATER ELE IN EQ
44.50
FT ELE
HIGH POINT ELE
53.00
FT ELE
ELEVATION HEAD
8.50
FT
FM1 SIZE
4.00
IN
L, FM1
500.00
FT
Hf, FM1
1.90
FT
TDH
10.40
FT
75 GPM - 3 PUMPS IN TOTAL
EQTANK MOSTLY EMPTY
TOTAL ELEVATION HEAT]
INCLUDES EQ. LENGTH FOR VALVES ETC -LONGEST RUN
FRICTION HEAD FOR PUMP DISCHARGE
TOTAL DYNAMIC HEAD CACULATED
PUMP OPERATING POINT
TDH 15 FT CONSERVATIVE BASED ON ABOVE
Q, PUMP 75 GPM (25 gpm FOR EACH PUMP)

PLURIS HAMPSTEAD WWTF
PLANT MODIFICATION TO 0.5 MGD
ADDENDUM TO THE
PROJECT SPECIFICATIONS
b-9-21
FIRM C-1989

TABLE OF CONTENTS
Part A. Equipment register showing proposed equipment including
the number of all pumps and blowers to be supplied.
Part B. Construction Sequence

Part A. Equipment Register

PLANT EXPANSION EQUIPMENT REGISTER
TAG ID
NO
DESCRIPTION
MANUFACTURER
SUPPLIER
P&ID INDEX
SPEC PG
APP. TAB
3.1
1
STATIC SCREEN
GULFSTREAM FAB
PLURIS
SCR-300101
3.2
1
GLASS LINED EQTANK
TARSCO
EW2
TNK-300101
3.3
4" 304SS AIR LINE
CONTRACTOR
3.4
1
EQ DIFFUSER SYSTEM
EW2
CBD-300101
3.5
1
LOW LEVEL SENSOR
MEYERS
PLURIS
LSL-300101
3.6
1
HIGH LEVEL SENSOR
MEYERS
PLURIS
LSH-300101
3.7
2
EQ PUMPS, SUBMERSIBLE 450 GPM @30 FT
FLYGHT
CONTRACTOR
PMP-300101, PMP-300102
3.8
4"-6" SCHED 80 PVC
CONTRACTOR
3.9
2
SWING CHECK VALVE
CONTRACTOR
CHV-300101,CHV-300102
3.10
2
GATE VALVE
CONTRACTOR
V-300101, V300102
3.11
3
6" & 12" GATE VALVES, SQ. NUT OPER.
MEULLER
CONTRACTOR
4.1
1
GLASS LINED DIGESTER TANK
TARSCO
EW2
TNK-400101
4.2
1
DIGESTER DIFFUSER SYSTEM
EW2
CBD-400101
4.3
4" 304SS AIR LINE
CONTRACTOR
4.4
1
LOW LEVEL SENSOR
MEYERS
PLURIS
LSL-400101
4.5
1
HIGH LEVEL SENSOR
MEYERS
PLURIS
LSH-400101
4.6
1
4" GATE VALVE, SQ. NUT OPER.
MEULLER
CONTRACTOR
5.1
1
EQ BLOWER
AERZEN
EW2
BLR-500001
5.2
1
DIGESTER BLOWER
AERZEN
EW2
BLR-500002
5.3
1
COMMON STAND-BY
AERZEN
EW2
BLR-500003
5.4
3
PRESURE RELIEF VALVE
AERZEN
EW2
PRV-500101, PRV-500102, PRV500103
5.5
3
AIR CHECK VALVE
AERZEN
EW2
CHV-500101, CHV-500102, CHV500103
5.6
5
4" BUTERFLY VALVE, MANUAL
CONTRACTOR
V-500101-5
5.7
4" 304SS AIR LINE
CONTRACTOR
6.1
3
WASTING PUMPS 75 GPM @20 FT
MEYERS
CONTRACTOR
PMP-600101, PMP-700101, PMP-800101
6.2
3
2" PVC CHECK VALVE
CONTRACTOR
CHV-600101,CHV-700101, CHV800101
6.3
3
2" PVC BALL VALVE, SCHED 80
CONTRACTOR
V-600101, V-700101, V-800101
6.4
2"-4" PVC WASTING LINE
CONTRACTOR
6.5
2
4" GATE VALVE, SQ. NUT OPER.
MEULLER
6.6
1
12" GATE VALVE, SQ. NUT OPER.
MEULLER

Part B. Construction Sequence
1. The Wilmington Regional Office NCDEQ staff will be notified prior to the
construction beginning.
2. The area to be disturbed will be cleared of any vegetation, shrubs and trees.
Areas to be excavated such as the tank foundation sites will be grubbed and the
root mat will be removed.
3. TASRCO TANK has been tasked with providing turn -key tank construction. This
includes the tank foundations and staircases. This work will proceed after the
tanks are staked out by a NC PLS.
4. The tanks will be leak tested for a minimum of 24 hours by filling to the
respective freeboard elevations. A measurement from the tank rim will be taken
at the beginning of the test and at the end. Any precipitation will be taken into
account. Tanks will be inspected by the Engineer prior to and after the 24 hour
period. Any leaks or issues will be corrected, and if required the test will be
repeated. After the tanks have passed the leak testing phase the water will be
removed so that he diffusers and pumps can be installed.
5. After the tanks are erected the blower shelter will be constructed. This involves
the driving of the support pilings and the pouring of the pad that bridges the two
tank foundations.
6. Installation of the proposed pipelines and valves will commence after all existing
lines have been located and marked.
7. The static screen will be installed on the Equalization tank and connected to the
influent piping.
8. All lines will be pressure tested at 150 psi for a minimum of 2 hours.
9. Diffusers will be installed in both tanks. Air lines will be installed to the blower
shelter.
10. The pumps and rail system for the Equalization tank pumps will be installed.
11. The wasting/rescreening pumps will be installed in the MBR Zones.
12. The blowers will be set and plumbed to the air lines per the plans.
13. After all pumps and blowers are set, electrical lines will be run and the various
devices connected to power.
14. Both tanks will be filled with enough water to allow for diffuser and pump
testing, usually a minimum of 2 feet over the top of the diffusers.
15. Pumps will be tested for operation, rotation verified and a drawdown test
performed to confirm the pumping rate. Floats will be tested for correct
operation.
16. Blowers will be turned on and the diffuser lines will be checked for leaks and the
diffuser patterns will be reviewed to make sure that the air is being properly
dispersed throughout the tanks.
17. After all manufacturer's representatives have verified correct installation of all
components and all systems have passed all tests and been adequately started up
to assure proper operation, the tanks will put into service.
18. NCDEQ staff (Wilmington Regional Office) will be contacted to witness all
testing if they wish. Any NCDEQ staff comments will be addressed in a timely
manner.