WQ0034367_More Information (Received)_20200106

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DICI<SON
community infrastructure consultants
January 6, 2020
NC Department of Environmental Quality
Division of Water Resources
Water Quality Permitting Section
Non -Discharge Permitting Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Attention: Ms. Ashley Kabat
Environmental Engineer
Division of Water Resources
Re: Application No. WQ0034367
Additional Information Request
Northwest Regional WRF
High -Rate Infiltration and Reclaimed Water Bulk Distribution System
Onslow County
Dear Ms. Kabat:
Please find enclosed the additional information to address the items received November 22, 2019:
1. Compiled TSS and Flow Data — "2020-01-06 Compiled NDMR Data.pdf"
2. Disc Filter Flow Analysis — "Discfilter Calculations.xlsx"
3. Rental Disc Filter Information — "200046-AO 40X Disc Pricing.pdf"
4. Existing Disc Filter Information — "Siemens 40-X Disc Filter Data Sheet.pdf"
1. K. Engineering Calculations
"Provide signed, sealed, and dated Engineering Calculations showing that the facility will
meet effluent standards listed in Attachment A of the existing permit with the removal of
the membrane filters from the treatment works."
Response: Since Hurricane Florence (September 2018), the facility has been meeting
effluent standards listed in Attachment A of the existing permit without the membrane
filters. Refer to the attached TSS and flow / loading data. A rental disc filter is temporarily
installed upstream of the existing disc filters, membrane filters and UV disinfection system.
The flow has been temporarily bypassing all these components due to impacts from
Hurricane Florence. Therefore, based on the effluent TSS numbers achieved without the
1213 W. Morehead Street
Suite 300
Charlotte, NC 28208
Tel. [phone]
wtiwv.wkdickson.com Aviation • Water Resources • Community Development • Energy

Ms. Kabat
January 6, 2020
Page 2
membrane filters online, and at a significantly higher hydraulic loading than the existing
discfilters are designed for (9.25 gpm/ft2 at max. daily flow versus 0.48 gpm/ft2 at max. daily
flow each), once the rental disc filter is taken offline and the existing disc filters return to
service, it is expected that the plant will continue to meet effluent standards without the use
of the membrane filters as has been demonstrated since September 2018.
2. N. Operation & Maintenance Plan
"Provide a revised Operation and Maintenance Plan that includes the required operation
and maintenance of the new open -vessel UV system rather than the closed -vessel system or
state that a final O&M plan will be submitted with the Engineering Certification."
Response: A final O&M manual and plan will be submitted upon contractor final
submittals and approval by the Engineer.
3. P. Additional Documentation - Existing Permit:
1. Please provide the following schedules from the current permit issuance:
i. Prior to operation of the reclaimed water bulk distribution system, the Permittee shall
submit documentation of a bulk reclaimed water education program in accordance
with 15A NCAC 02U .0501(a)(3), .0501(b)(4), and .0601(d).
Response: Please note that currently there has been no operation of the reclaimed water
bulk distribution system. In accordance with 15A NCAC 02U .0501(a)(3), .0501(b)(4),
and .0601(d) prior to the reclaimed water bulk distribution being placed in operation,
ONWASA will submit documentation to NCDEQ of a bulk reclaimed water education
program.
2. The inspection report prepared from the Wilmington Regional Office explained that the
groundwater lowering system has not had water present for sampling as required by
PPI 002 in the current permit issuance. Provide an explanation on how the groundwater
lowering system is operated and how sampling is performed for PPI 002 at this facility.
Response: The groundwater lowering system is a pumped system and is controlled
through a float system. This pumped groundwater's flow is measured through a flow
meter, and the flow through this system is sporadic and at times nonexistent. One
month exceeded an average daily flow in excess of 10,000 gallons per day and this was
during hurricane impacted month. We would propose that the sampling of PPI 002 be
IICKSON

Ms. Kabat
January 6, 2020
Page 3
dropped from the permit and utilize the sampling from the monitoring wells (MW-1,
MW-2, MW-3, and MW-4) as an indicator for the impact to the groundwater.
Should you have any questions or need additional information, please contact me at 704-227-3417
or email at [e-mail]
Sincerely,
W.K. Dickson & Co., Inc.
Mr. James W. Holland, P.E.
Project Manager
c: Mr. David M. Mohr
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Engineering Director
Onslow Water and Sewer Authority
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Data Sheet for Tertiary Filter
Equipment Name: Siemens 40-X Disc Filter
Service: Sanitary Waste Water Filtering
Tag No.: 20331000279
Plant Location: Onslow County, NC (ONWASA)
No. of Units: Two (2)
Manufacturer/Model: Siemens / 1406 Tank Disc Fitter
1
OPERATING DATA
CONSTRUCTION MATERIAL
2
Filter Type
Disk/Drum, cloth media
Drum/Tank
304 Stainless Steel
3
Fluid
Municipal Waste water
Fitter
304 Stainless Steel
4
Nozzle
Plastic
5
Maximum Liquid Flowrate / unit mgd
2
Flanges
304 SS Cut Plate
6
Operating Temperature °F
Ambient
Gaskets
Note 4
7
Operating Pressure atm
Atm
Bolting, external
304 SS
8
Liquid Density Ib/ft3
62.4
Nuts, external
304 SS
9
Liquid Viscosity cP
1
Painting / Coating External
N/A - Note 1
10
Vapour Flowrate
N/A
Internal
N/A - Note 1
11
Vapour Density @ T/P
N/A
MECHANICAL DATA
12
Vapour Viscosity @ T/P
N/A
Drum/Disk size In
39.2
13
Molecular Weight
N/A
Number of filter elements
28/disc
14
Flange Rating / Facing
150 lb.
15
PERFORMANCE
Tank Thickness shell/head ga
11
16
Liquid to be removed
N/A
V se nk me r in
/A
17
Particle size to be removed (um)
> 10
ess I / Ta k He ght ( /f) i
100
18
Allowable pressure drop (clean)
Negligible
Gross Filteration Area (2 filters) ft2 m2
830
19
Allowable pressure drop (dirty)
300 mm
ffect.Filtr. Area (NEFA) 2 fifters ft2 mz
_
20
Max Influent Total Suspended Solids (mg/1)
20
Ba kw fac ity
s ray ozzl
21
Effluent Total Suspended Solids (mg/I)
< 5 (see note 7)
Mesh Type, Absolute micron
10
22
Effluent Turbidity, 24 hr Avg.(NTU)
N/A
ESTIMATED WEIGHTS
23
Effluent Turbidity, Max. (NTU)
N/A
Shipping lb
8,000
24
Operating lb
19,600
25
DESIGN DATA
Hydrotest lb
n/a
26
Design Code
N/A
Internals lb
n/a
27
Vessel Orientation
Horizontal
ACCESSORIES
28
Corrosion allowance mm
N/A
29
Design Temperature "F
n/A
Drain Valve
Siemens to Supply
30
MDMT "F
N/A
Level Monitor
IFM Effector
31
Design Pressure (Internal)
Full of Water
Level Switch
IFM Effector
32
Stress Releving
N/A
Drives
SEW
33
Radiography and UT
N/A
Motors
Baldor
34
ASME Code Stamping
N/A
35
Shop Hydrotest Pressure
Full of Water
36
Fitter Support
N/A
37
NOTES
38
1. Standard Stainless Steel Handling and Washing Procedures including Oakite Post treatment
39
2. Botts and nuts shall be Stainless Steel for optimum corrosion protection as per ASTM At 53
40
3. VTA = Vendor to Advise
41
4. Spiral wound, 4.5mm thk, ASME B16.20 SS 316L winding with graphite filled, SS316L inner and outer ring
42
5. All flanges up to 24" NB shall be as perASME B 16.5 and above 24" in accordance with ASME B 16.47 series A.
43
6. Direction of the flow shall be cleary stamped on the filter.
44
7. Chemical addition and additional equipment may be required at buyers expense if the Turbidity or TSS is
45
originated from significant particles <10 micron in size, or any other constituents renderthe water unfilterable.
46
47
48
49
50
51
Sheet1 oft
52
53

DAVCO'"
an 6V000A brand
EVOQUA FORTY-X DISC FILTER
BUDGET PROPOSAL
Project Name: ON WASA Disc Filter Pricing
Date: 11/22/2019
Proposal Number: 200046-AO
Process Performance Requirements:
Avg. Daily Flow:
Peak Daily Flow:
Influent Avg. TSS:
Influent Peak TSS:
Effluent TSS:
Fg2 X Filter Sizing and Selection:
Number of Filters:
Filter Model Number:
Avg. Hydraulic Loading Rate:
Avg. Solids Loading Rate at Avg. Flow:
Max Solids Loading Rate at Avg. Flow:
Peak Hydraulic Loading Rate:
Avg. Solids Loading Rate at Peak Flow:
Max Solids Loading Rate at Peak Flow:
0.6 mgd = 417 gpm
1.2 mgd = 833 gpm
10 mg/I
20 mg/I
5 mg/I
h 1
E1403T
4.63 gpm
0.56 mg/I
1.11 mg/I
9.25 gpm
1.11 mg/I
2.22 mg/I
Fortv-X Filter Specs:
Submergence:
65%
Effective Filter Surface Area
90
ft' / filter
Drum Rotational Speed
1-3
rpm
Drum Drive Motor
2
Hp, 480V, 3ph, 60Hz
Backwash Pump
33
gpm at 100+psi
Backwash Pump Motor
5
Hp, 480V, 3ph, 60Hz
Material of Construction:
Filter Tank
304
SS
Central drum
304
SS
Sliding Cover
304
SS
Filter Cloth
316SS
Filter Panel Box
ABS / PPE
Backwash Trough
304
SS
Spray Manifold
304
SS
Evoqua Additional Scope:
Each filter to have individual PLC based control
panel with HMI and ethernet port (of Evoqua's standard
design and components). Mounting by others.
Trailer mounted 3 disc filter unit.
Site set up including piping, delivery and initial commissioning of the unit.
Level probe for automatic backwash operation.
Standard equipment spare parts including: 4 filter panels and 4 spray nozzles
No

DAVCO"
an E)VOQUA brand
Equipment startup and operator training: 2 days on site, 1 trip.
Supplied by Others
Civil construction and installation; including piping, concrete works, and electrical connections
Other instrumentations not described herein
Control Panel stands or mounting
Effluent/ Bypass Weirs
Equipment Access Platform or Grating
Equipment Freeze Protection
Any necessary bid bonding requirements
Influent feed pumps or influent isolation valves
Any other items not explicitly indicated in this proposal
Eaurent Budget Pricing:
One (1) Forty-X Disc Filter(s) and scope as defined above .................... $245,000 US Dollars
F.O.B. Thomasville, Georgia. Freight is included.
Taxes and Duties are Not Included.
Price and delivery estimate valid only for 45 days from date of this proposal.
Recent market conditions have resulted in exceptionally volatile prices for materials. This means
that the cost used for developing the prices in this qucatation are subject to escalaltion. As a
result of the recent tariffs, it has become necessary for Evoqua to pass along any excalation
in the cost of materials affected by recent tarriffs.
Delivery:
Submittals: 4-6 weeks from mutually agreed upon and signed contract for submittal delivery.
Equipment: 16-18 weeks from approved submittals for equipment delivery.
The scope of supply and pricing are based on Evoqua's standard equipment selection, standard terms of
sale and warranty terms. Any variations from these standards may affect this budgetary quotation.
Additionally, please note that this budgetary quotation is for review and informational purposes only and
does not constitute an offer for acceptance.

Effluent TSS Data
(9/4/2018 - 8/28/2019)
12
10 4- - - - - - - - - - - - ------ - - - - - - - - - - - - - - - - - - - - - -----
O Daily TSS
8
- - - - Daily-Wa-x (10 mg/L)
- - - - Monthly Avg Max (5 mg/L)
6
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Flow Data
(9/4/2018 - 8/28/2019)
1,600,000
1,400,000 t O Daily Flow Effective Loading (gpm/ftz)
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400,000 8 ��O O O �� �5 ® ® 0 0 O
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200,000 0 8 O O O
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- 10.00
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- 2.00