Trident TR-840A Retrofit WesTech Unit 6.pdf

ADDENDUM NO. ONE

IFB 2024-W-005

Filters & Clarifiers Rehab

October 15, 2024

Please review all three manuals for this project.

This Addendum to the above referenced project shall become a part of the Contract Documents and shall be binding in all respects.

Information contained in this Addendum shall supersede any information presented in the Contract Documents.

The bidders shall permanently affix this Addendum to the Contract Documents and Specifications so it will be turned in with the bid.

The undersigned bidder acknowledges receipt of this Addendum No. ONE.

Received by:

Firm Name:

Address:

Date:

Phone:

END OF ADDENDUM

Trident½ TR-840A Retrofit WesTech Unit 6 Clairifer Section

Filter Section w/ Multiblock Underdrains

USFilter - Memcor

Project No. 400060

PUEBLO WEST METROPOLITAN DISTRICT

PUEBLO WEST, CO

Prepared By:

USFilter-Memcor 441 Main Street/ PO Box 36 Sturbridge, MA O 1566 Project Manager: Brad Oswalt Project Engineer: Andrew Schwarzer

Submittal

Package

Rev 1

March 20, 2006

A Siemens Business

SECTION N - ROBERTS LIQUID LEVEL CONTROLLER

Roberts Water Technologies, Inc.

Lh and Columbia Avenue

Darby, PA 19023

(610) 583-3131 Tech. Service: (800) 788-8568 E-mail: servi ce�ro bertsfil tergro up. com

Roberts 1Vater Technologies, Inc.

6'h and Columbia Avenue

Darby, Pennsylvania 19023

Liquid Level Controller (LC115)

Operational Manual

Table of Contents

System Overview

Connections and wiring

Voltage check on LC-115 board

Testing and calibration

Packaging and shipping

LC 115 Wiring Diagram ............................................................... LCl 15-El

Dip Tube Assembly ........................................................................... S170

System Overview

The LC-115 Liquid Level Controller is an instrument (a proportional conlro!lcr) that measures and controls the level of water in a filter. A dip tube mounted near the water surface is connected to a pressure sensor on the LC-115 electronics board. (Refer to drawing Sl70 for further details on dip tube). The LC-115 can sense/measure level changes in a three-inch range. The output is a 4-20 mA signal, which is directly proportional to the level measured within the three-inch range. This signal is directed to either the effluent valve or the filter to waste valve as directed by the PLC program.

During the drain down stage of a backwash sequence, the proportional signal is overridden by a direct signal, which is adjustable via the electronics. This direct signal will drive the appropriate valve approximately halfway open during drain down in order to lower the filter level prior to an air scour.

Shown below in figure 1 is the front door of the LC-115.

Figure I

Numeric display inclicati11g the liqt1id level ill illches

Status liglits fodicating the current operatiltK mode of the treatment unit

LED Bar graph clb,playing the liqllid level

The numeric display below the "LC-115" label indicates the level or hci ght of the water relative to the dip tube.

The vertical green LED bar graph indicates the level of the liquid in proportion to the actual level.

The 3 indicator lights mounted beside the bar graph indicate whether the "Effluent" (green) or the "Filter-to-Waste" (orange) valve is being operated. During the drain down stage of a backwash, the "Drain Down" in<licator will illuminate.

Connections and Wiring

The LED board is mounted to the aluminum back plate via screws and stand-offs, while the level controller board is mounted to the back of the LED board. Shown below in figure 2 is the arrangement of the terminal blocks within the LC-115's back plane, which contains the following:

4 signal tenninal blocks, 4 fose terminal blocks (0.6A) G ground tenninal blocks 2 end caps

Refer to drawing LCl 15-El for more details on wiring the back plane.

2 4 6 8 11 14 fuse 2 fuse 4 l 3 5 7 fuse 1 fuse 3

Tenninals blocks 4, 6, 8, 11 and 14 - Ground tenninal blocks (green and yellow terminal blocks above in figure 2).

Terminal block 1 - 24 VDC input from an external source (typically filter control panel) to LC-115 main board.

Terminal block 2 -Return signal from the external voltage source

Terminal block 3 - Effluent valve input signal from the PLC.

Terminal block 5 -Filter To Waste valve input signal from the PLC.

Terminal block 7 -Drain Down input signal from the PLC.

Fuses 1 and 2 - Effluent valve output signal ( 4-20mA) to the valve or I/P

Fuses 3 and 4 - Filter to waste valve output signal ( 4-20mA) to the valve or I/P

Terminal blocks 1 and 2 should be wired to a 6-pin connector, which goes into its 1st and nd slots. This 6- pin connector in connected to )4 on the LC-115 board. The first two terminals on J4 cany the 24V DC input supply voltage, which powers the LC-115 board.

The next two terminals on the J4 connector is a 5V DC output supply voltage that powers the LED board. The last two terminals are 24V DC output for convenience.

The 5V output signal from 14 is wired to a 3-pin connector, which connects to Jl2 on the LED board having the middle terminal as ground and the signal as the terminal towards the 6-pin connector on the LED board.

Terminal block 1 is also wired to the 9th pin of a 10-pin connector, which connects to J3 on the LED board. This signal powers the current loops ( 4-20mA signals going to the modulating effluent and filter-to-waste valves) of the LC-115. Detailed wiring of the current loops are shown in drawing LCl 15-El.

Finally, terminal blocks 3, 4, 5, 6, 7 and 8 are wired to an 8-pin connector that connects to J1 of the LC-115 board. These signals are input commands from the PLC, which are optically isolated within the LC-1 l 5 board for safety measures.

With having all the wiring complete also ensure that the LED board contains an "AD420AN" chip (an analog to digital converter integrated circuit) mount on the Ul2 socket.

For a detailed wiring diagram refer to drawing LCl 15-El.

Specific points to look at before connecting the LED board

Note: These voltage checb on the LC-115 board should be carried with all power to the LED board disconnected, which can be done by simply removing the connector JI 2 on the LED board. Upon successful completion of this voltage check, the power to the LED board can be connected.

The voltage across the 1st pin on J4 (24V input signal) and the 8th pin on Ul2 should be

12VDC.

The voltage across the 1st pin on J4 (24 V input signal) and the 7'11 pin on Ul 2 should be

24VDC.

An 8.3k0 resistor (Color code: white, brown, red) across R2 should replace the potentiometer RV 1.

If the above voltages are in close proximity to the given values then all LED board connections can be made. The purpose of this voltage check is to ensure that the LC-115 board is functioning as per expectation.

Testing and Calibration

Note: The Liquid Level controllers are subjected to intense testing and calibration prior to being shipped out to the field. However some further field calibration may he required as testing is carried out based upon simulated 1/0. For example upon drain down the modulating vales are set to open 50% but may be required to open more or less depending on the flow rate and the piping. Refer to the checklist in appendix 1 when carrying out testing on the LC-115.

VR4 (50KO. potentiometer) should be calibrated such that on a zero inch level the output signal (4-20mA) across fuses 1 and 2 or 3 and 4 (depending on which valve is being operated) should read 4mA. Similarly on four inches of water the output signal should read 20mA. This implies that at high level the valve will be fully open and at low level the valve will be fully closed.

During drain down the output signal should be 12mA. This signal will be directed to the valve that is selected by the PLC. VR4 (50KO potentiometer) should be calibrated such that during drain down a 12mA output signal is obtained. This implies that the valve \Vould be opened to 50% during drain down mode.

The signal across the ih pin on Ul 3 and the ground should be 0.5 volts when the level is zero inches. Adjust VR 2 (l0Kn potentiometer) until this value is obtained.

The signal across the ih pin on Ul3 and the ground should be 3.5 volts when the level is three inches. Adjust VR 3 (500 potentiometer) until this value is obtained.

Packaging and shipping

A complete LC-115 package should include the following elements:

• LC-115 box, which includes LC-115 board, LED board, and all other wiring.

• A complete dip tube assembly with tygon tubing.

• Carlon mounting brackets

Ensure that the boxes are properly closed; all additional wires and jumper used for testing are disconnected and removed prior to shipping.

B/M R09ERiS

PART

ITEM NUMBER

S170

A FTPP010

B FfP 1/8

C T.AGTUB1/8

D PPP4001W

r----=-----1 4----------

NOTE: USE TEFLON TAPE ON

THREADED FITTING.

6"

SIDE VlEW

QTY. ! MATE.~iAL UST PER UNIT

#/UNIT

'l

6 FT.

6"

I I I I I I I I I I I I I I I I I I I I I I I I I

I I I l l I I I I I

X I 0 I

(I) I

LL I

0 I

I w l 0 l (/) I f- :::i I 0 I

I I I I I I I I

DESCRIPTION

LEVEL cmnROLLER DIP TUBE ASSEM6L Y

1" DIA. SCHEDULE 80 PIPE CAP TAPPED FOR 1/8 l~PT

BARBED HOSE FITTING, 1/8" NPT X 1/8" TUBING ADAPTER

1 /8" TYGON TUBING

1" DIA. SCH 40 PVC PIPE, WHITE

X co

LL

w (J) z

CONTRACT #

QUANTITY ______ _

THIS DRAWING REPRESENTS THE OESIGN

N,D ENGINEERING EFFORTS OF ROBERTS

Tli!S DRAWING ANO ASSOCIAiE'.D DOCUMENTS

MAY NOT BE REPRODUCED , LOANED,

COPIED OR USEO FOR ANY PURPOSE WITHOUT

1HE D(PRESS WRITTEN AUTHORIV.nON OF ROBERTS, G

CJJ""

0 Po:, ~ C\l c:, 0)

~ -~ u ~

~ ~ s::

Cl:J

Q:;

C/J ~ c::q

SCALE

>- >-Cl'. CD "- I!:' If) < '- 0 0 -

- o' z tr)

I~ ~m er: ~ w~ ::l (/) 0~ a: Lu I- a:i z ::::> 0 I-

__J 9:: w o ::l

NTS

Cl w

~ :r u

CONTRACT

SECTION A

DWG

S170 Nn

I flL TER TO WAST£ [ 1//>J.Vt SIGNAL TO

PLC 4-20mo r9,9ATED_ON~KPN-IEL Ill LC-17 ' ,........,_~_._, l

FUSE

rusE GNO 1IRIJlNAI.

I I

I ,__,.___...L...J I

L ______________ J j I

' i i l I I i i I I j I I

I

I I

J4

GND D

3 [Il

I/')

GND §

5 ~

GND

J12

R WN

WH

J1

GND

GNO 0

g

,,., -• GND §

3 0 ,...

GND

ORANG

J3

J4

JS

2 I-

Ti-115 DRAWING REPRESENTS THE DESIGN

AND ENGINEERING EFFORTS OF ROSERTS

THIS DRAWING AND ASSOCIATED DOCUMENTS

MAY NOT SE: REPRODUCED. L.OANED,

COPJE:0 OR USED FOR m Y PURPOSE WITHOUT lHE !'):PRESS WRITTEN Atm-lORlZATION OF ROBERTS.

:c >---, a, -, "' ~ 0 w <

' r- \c: 0

('I 0 r')

0 g

V)

C..:> C ~

C c::, Cl') t5~ ~ :s _J(.!)

~ _.l<( o- 0::0 l[)

~ I-00::..-r,;i

2 zo.-

0-Li..O 00:: _J

~ t"aq ...J3:-

~ WO

GJ_J

_Ju.I

Ci:

VJ ~

E-o::i C

SCALE

CONTRACT LC 115

SECTION A

~~~LC 115-E1

THE ADSORPTION CLARIFIER-" IS A

TWO-IN-ONE TREATMENT PROCESS

WE AIM TO RAISE THE STANDARD IN WATER TREATMENT

In the first stage of treatment, chemically closed raw water enters the Adsorption Clarifier, where an upflow treatmeut process combines flocculation and dari ficarion in a single unit ou:upy ing less than 20% t>f che floor space uormally required for these funnions in a conven tional system.

This space - and cost saving is made possible in part by the nature and placement of the adsorption media.

Conventional clarifier systems and clar ifiers with tube scttkrs or plate settlers, require a larger "footprint'" to allow enough time for floe to setcle. Instead, the Adsorption Clarifier uses special, naturally buoyant media which is rolled and scarified and held in place by a sc rccn at the top of the clari ficr rank. In normal operation, the natural buoyancy of the media and tbe upward process flow hold the media firmly in place against the rop screen.

CL\AIF!ER OPEIIAmN IIAT'EII tEVEI.

AO$Ol\l> flOII

MEOIA

l t t WAIEllflOW

In many cases, especially if color or algae is the major treatment issue, Trident can use less co,1gulant and polymer than conventional settling type clatifiers, because with the Trident Adsorption Clarifier it is not necessary to form a settleable floe, which means settling time is not a factor.

If nrnimenance is required within the Adsorption Clarifier for any reason, access is easy. Just remove a top screeu panel an<l temporarily float the clarifier media onto the filter for the mainte nance period.

There are Adsorption Clarifier units designed to operate at flow rates that range from 5 co 15 gpm/ft2, generally achieving turbidity removal levels of 75-95%. In pilot studies, Adsorption Clarifier units have performed satisfac torily at ra tes as high as 25 gpm/ft2 •

TIIOVG~

W"A!'ERI.Eva llilCKWASH

AIR

FILTRATION MODE

' ~ aAC<\ t.] \I/AS~

'FILfEFl•O

WATER

ADSORPTION CLARIFIER

FLUSH MODE

ADSORPTION

MEDIA

FILTER

CLEANING MODE

TROUGH

WATER LEVfl

Fl l TER OPERATION

WATER LEVEL

CKWAfiH

BAC~

WASH

FILTER t ' FIUEAfO

TO WASTE WATER

OUR NEW STANDARD IN FILTRATION:

MIXED MEDIA AND THE MICROFLOC®

TRITON UNDERDRAIN

A 6 MGD raJlc1City T rid:i,t pn-engineered system ii ins1,./L1d in Le1co11itt, New H,m{JJbirr.

MICROFLOC TRIDENT@ WATER TREATMENT SYSTEMS ARE CHARACTERIZED BY

CONTINUOUS IMPROVEMENT

From the Adsorption Clarifier"'~ flow passes through the Tridem Mixed Media filtration chamber, after which it is collected by our Microfloc® Triton undcrdrain. We pioneered Mixed Media technology, which has Gemme the industry filtration standard. Now we have coupled it with our Triton direct retention nnderdrain, which affords all the benefits of .~imultaneous air/water backwash while eliminatin,s the need for support gravel.

Our Mixed Media filter media design uses three or more granular materials of differing size and specific gravity layered ro produce a filter thm is coarse near the top of the bed and becomes pmgressively finer towarJ the hotrom. Process flow is from the top Jown and solids removal is progressive throughout the entire bed depth. The bottom layer, being very fine, heavy density media, creates superior quality finished water. Its fine particle and pore sizes arc factors which comrihuce to the bed's excellent ability to resist breakthrough by CryptoJjJoridimn and Giardia !amblia.

The approach of using progressively finer media from top to bottom is in accord with the filtrntion theory which holds that the removal efficiency of a filter depends upon the opportunity for particulates to attach to the surfaces of

Dou;nf!r,u, A-fixed Media jil1Tatio11 ml/J differing materials to prod11ro a fi11tt which hecomts progmJir>ely finer f(JWan/ the bo110111. Shown above left, aJ i11Jta!led and al right, after barkivash.

the filtration media grains. Using the Mixed Media design allows placemem of ,1 high specific surface are,1 bed in a compact filter area. This "coarse to fine" design with high specific su rfiice area ensures optimum particle capture for production of high-quality drinking water.

MICROFLOC AOUARITROL~ Ill CONTROLS SYS-

TEM PERFORMANCE

Th" 1lq11ati1rvl lll provid<1s wn1i1111011s ro1mol over chemical dwi,ie to maintain a desired /e,,-e/ of eff/11ent tnrbidity f/1,'I" when raw w,mr q11ality ir wj,idly ,hanging.

MICROFLOC TRIDENT~ TECHNOLOGY HAS

BEEN APPLIED TO SYSTEMS UP TO 40 MGD

§gor--C_O_ S_T_O_F_TRID __ ENT __ P_LANT ___ s _ _,.

"- vs CONVENTIONAL SYSTEMS. -;;;

§ 60 il

" 8 40 ·z ...

C

.;:'. 20 C

" ~ 0 ~ .5 l 2 4 6

Plant capacilt, MOD

Comp(lred ro comw11io11a! trMll!le>11 ,y.rwm, 1h, Trident Jpte111r ca11 ml capira/ ro11 by 50% or 1i101r.

Changes in raw water characteristics and flow rate are automatically detened by our Microfl.oc Aquaritrol® III solid state umtrnller, which monitors filter effluellt quality and rnntinuall y evaluates and changes chemical feed to main tain desired (or preset) water qLiality parameters.

In the raw water version, the Aquaritrol III maintains specified effluent turbidity l:,y controlling chemical dosage up or down based on dep;irtures from specified filter effluent turl:,idi ty (and, optionally, pH) setpoints and the n,te of clrnnge in raw water turbidity versus time.

In the stre;iming current option, continuous monitoring of filter eflluent

There ure three basic configuwtions for the Microfloc Tridenl'J technology, b.,sed on required treatment capacity.

The smallest of these, the Microfloc@ Tri-Mite, is designed for ilows Crom 50 to 700 gpm (0.072 to J.O MGD).

These units ,1re factory-assembled single wnk systems ready to go. They rnke up Ii mired floor. space and are easy to insrall ;ind operate.

O\lr modular Micro/Joe Trident® systems are used for flows from 5'.lO gpm (0.5 MGD) and up. The largest single sieel tank module can rrear 2.0 MGD and can he shipped on an ordi nary trailer rruck. Shipping hy rruck allows each faetory-builr module ro he scnr direct ro the job sire, which simpli fies and shonens on-site consrruction.

fior huger capacities, our Microfloc0

Tricon design usc:s prefah1·icared Trident modules pl,1ced in economical concrere basins. Hecause it is modular, this design rnn a('(:ornmodate any sysrem capaci1y. Tricon can also be cusrom-dcsigned for your exact needs, even for rhe largest of trca[mcnt rnparitics, whe[her yoll arc Jcsigning a turbidity permirs selection of a stream ing current sec point that is continually re,1djusted to al low fast response: co changing fllrcr effluent water quality resulting from changes in raw water condirions. The streaming current version is also capable of controlling your Tridenr sysrcm based on filter efrluent rurbidity or Slrcaming current alone. This redundant control system helps optimize [be Aquari trol III maimcnance of preset effluent quality paramc[crs, Ei thcr version of rhc Microfl.oc Aquaritrol III can run your Trident sy!,tcm at optimum chemical costs for selected effluent quality parameters.

new plant or renovMin.g an older one.

Hefore plnnt design work begins, we can perform n pmfessional, on-site pilot study with our mobile pilot plant.

Based on the findings, we can establish the chemical parameters and design requirements for a Trident system.

Among the applications we can evaluate in sud1 a pilo[ study arc turbidity, algae, color, taste and odor removai, Gie1rdi11 l,1m/Jli11 and C:t:i,11tosjnn·idium removal, and iron and manganese removal. We can also nse the pilot plant rn assess the feasibility of tertiary wastewater treat nwnc and industrial applications such as prc:-treatment to RO, filtration, phosphorus reduction and boiler water pretreatment. We: have performed hunJrc:Js of pilot scud ics and have all cx[cnsive database. After completion of a pilo[ scuJy, we can offer a bonded process performance guarantee. In fact, in many cases after reviewing your JctaileJ water analysis, we can desi>Jn a Trident system and offer this perfor mance guarantee without piloting. Ask us for Jctai ls.

MICROILOC® TRIDENT AND TRID(Nl LP

WATER SY STEMS ME ET YOUR NEEDS

COST-EFFECTIVELY

MODEL

Typkol Design Flow GPM"

Length

Dlm%1:ions (~ tank) Width

Height

Microfloc Trident@ systems are working in hundreds of water plants acrnss the country, treating souru waters with a wide range of influent rnnditioDs utiliz ing a variety of ueacmenr solutions. The combination of our Adsorption Clarifier'" and Mixed Media filter delivers excellent finished water with pred ictablc, cost effective results. Kow, we've further refined the Tr idem sysrc m to reduce i cs physical size aDd cost. The Microfloc

Trident LP design offers cost s,1v.ings while providing all the benefits of ,1

Trident system for modernte quality (up to 30 NTU) raw water sources. Among the features in the new Trident LP line are lowtr overall rank height, a smaller foot print ilnd incorporntion of our Triton"' underdrain ro incre,J.Se the Jlow collection ~rt-a and allow direct rt'tention and Hit/ water back wash of the filter media without support gravel.

TR· 105A TR·2l0A TR·420A TR·840A TR· 105-LP TR· 210-LP TR-420-LP TR-840-LP

350 700 1400 2800 350 700 1-400 2800

1 0' 1" 14' 5½11 27' 10" 39' 10" 9' 1" 12' 11½" 24' 9" 35' 6"

6' 11" 8' 11" 8' 11" 11' 11" 6' 11" 8' 11" 8' 11" 11' 11"

8' 5" 8' 5" 8' 5" 1 0' 1" 7' 6" 7' 6" 7' 6" 8' 6"

• Design Row is for a two-lank syslem. Being modular allows us lo provide a I 1 1 /s) TR-21 OA lo treat l 050 gpm with 3 Ion ks, or o (2) TR-8.i0A for 5,600 gpm, etc.

MICROFLOC'°' TRIZONE PROVIDE5

CHLORINE-FREE PREOXIDATION

J Thi; 1\mhrm, M,,11.<arbm,t/J, f"ri/iry i,s/j OZO!I< tfl.h11,,/11yJ in c1m1imrtirm r1..-'ith Fridwt ,Mm1t.t

Our newest innovc1.tion, Microf1m:C• TriZone, combines Trident rcchnology with ozone in ,1 comp,KI, modular trcat mellt plant. This new system produces quality treated wHter by \Ising ozone in lieu of chlorine for preoxidarion. This approach provides elfecuve concrol for taste, color, odor, m.,mgancsc and moderate levels of iron in surface wacers.

It prevents form,ition dL1ri ng pretreat ment o[balogenME'd compoL1nds, such as trili~lometh,rnes and haloacctic acids, and reduces overal.l chlorine demand. In

10' 11 ½ 11

6' 11"

7'6"

• 16' O" so doing, it nrnkes it easier to comply -now a11d imo the Cuturc - with the Disinfection and Disinfection Aypt·oJucts Rule which nrnkes chlorine undcsirahle for many oxidizing ,1pplicacions.

The integrated ozone-Trident com bination - only slightly larger than the 'li:idrnt LP uni t alone - also saves space, allows control of al I the process functions and, in some cases, improves coagulation. Ozone may also he geaerated for downs11-carn disinfrccion.

700 1,400 2,800

14' 10" 26' 7½" 38' 2'/2"

8' 11" 8' 11" 11' 11"

7' 6 11 7'6~ 81 6~

0.5·3.0 mg/I 0.5-3.0 mg/I 0.5-3.0 mg/I

16' 0" 16' O" 16' 0"

• Design flow is for a two-tank system. Being modular allow, us to provide a Ill /2) TZ-210 to treat 1050 gpm with 3 tanks, or a 12] TZ-8AO for 5,600 gpm, etc.

B

MICROFLOC® TRICON BRINGS TRIDENT~

TECHNOLOGY TO LARGE CAPACITY SYSTEMS

'J 'ride,Jt treatment l)JJJd!fle.r art iwlaflJ i1' amuWe basim 10 m:ale the 'lric,m- "" 1m>1//!Hit1! .wlllti,m to hish-capa,i1y h'C<tlme/11 t;r:edr.

The same high efficiency that makes our Microlloc"' Trident units the choice of hun,\reds of customers for water systems in rhe 0.5 to 40 MCD range is available in systems of virtm11ly ,iny size. Called Tricon, it p.laces factory-1.:milt Trident internals into concrete basins, producing an extremely eflective - and economical

- large capacity sys rem. St;1inless steel construction of i 11 scrr module strnctu rnl materials provides durability while diminating costly and complex con crete forming, such as for rroughs and headers. We can custom-design a Tricon system to serve your particular sn e or flow requiremcnt.s.

Two (2) Tricon Modules Shown

MODEL CT-3 CT-4 CT-5 CT-6

ftp~~ _; MGD• 3 4 5 6 length 20' 5" 27' 21/2" 3~' 0" 40' l OP

.,~tE!-

Width 30' 7½" 30' 71/i" 30'7½ " 30' 71/2"

Height 11' 2" 11 ' 2" 11' 2" 11' 2" . -...,~., - -, Width 10" 21/2" 10" 21/i" 10" 21/i" 10" 21/l'

• Single module desigll.

MICROFLOC@ TRIMITE: ~IG PLANT

PERFORMANCE IN A SMALL WATER SYSTEM

T,~9 (2) T11Ll.50 'Frimi1t d11e1!-m1i1 syrt,ms ,m ready for Jhipmenr a1Jd installa1io11.

Tl.le M1croflocv Trirnite is factory assem bled. The first stage is the Adsorption Clarifier'", which is designed to generally remove 75% to 95% of the raw water turbidity before sending the flow ro the Mixed Media filter for finishing. The Trimi re is available in five standard si zcs as single units from 50 gpm to 350 gpm (0.072 MGD to 0.5 MGD) and as a two unit system up to 700 gpm (] .0 MGD) capacity. for flows less than 50 gpm, a

MODEL TM·SOA

lypi®I Desigp,flGW GPM" 50 length 91 .4 11

ShiP..¢flg Oimer11ion• Width 6' ,on

Height 9' ©"

*Single tonk design single tmit can be operated on an intermittent or reduced flow basis.

These systems are perfect for new designs with future expansion in mind.

The future additional tank would share the control p,lllel, turbidimeter, blower and b,ickwash pump of the first tank.

Options include streaming current men itor coagulation control and filrer ro-waste valve and controls for use after filler backwash. Ask us for more details.

TM·75A TM·l00A TM-175A TM·350A

75 100 175 350

9' 3• 10' 11" 131 511 22'6~

81 2" 81 0" 10' 4 11 10' 10"

9' 1" 8' 11" 9' :4" 9' .d"

TURBIDITY REMOVAL

IRON AND MANGANESE REDUCTION

GIARD/A IAMBLIA AND CRYPTOSF'ORIDIUM

REMOVAL

MICROFLOC TRIDENT"" SYSTEMS CAN HANDLE A WIDE RANGE OF

APPLICATIONS

The combinatio11 of the Adsorption Clari f1er"', Mixed Media filtration an<l gmvcl-frcc Trito11'" air/water wash under-

The Adsorption Clarifier is designed to generally remove 75-9501, of rhe raw warcr mrbidity - a level bt>tter than that of many co11 ve11tio11al floccularion and settling proce~ses - and Trident commonly produces finished drinking water with turbidity levels of 0.1 to 0.3 NTU, a11d if desired, Gtn be adjusted ro produce rnrbidi ty levels less lhan O. I N1U. Dy removing so much of the solids in the raw water, rhe Adsorption Clarifier exteods the Mixed Media filter's nrn and increases ovenill. net production.

Trident systems typically use alum and a polymeric Uocculant or filter aid. Ferric

Ad,orpciou clarification of oxidized solids followed I.Jy Mixed Medi,1 !titration dfeccively reduces iron ,1nd m,rngancsc rnncentrnrions <lown to acceprnhlc lcvds.

fo many applicmions, dirccr f1lcracion cam1ot economiG1U y t rear su rfacc war er s11prl ies wiLh higher levels of these minerals becat1se of irs short run times.

The Adsorption Clar1f1cr removes a h:rgt: ptrltnt :1g~: of ~-,,liJ~;, alluw iJ:g longer fill er ni ns in iron and manganese reduction applications, Jn some Iron and manga11ese reduction applicacions, the Adsorption Cfarifier media mnst he ckaned periodicnlly to prevent a reduction in its effect ivencss chat could othc1wisc occur over rime. We: havt: developed mid

Trident systems use coagulation, clari fication and lihration ro remove both of these troublesome parasites. Tridcnc pilot studies have demonstrated that clrains produces cxcd !cnt water qLmlity in a wide variety of applications and sysrcm sizes.

salts, sodium aluminate or cationic polymers can also be used as a primary coagulant.

ii 4 MGD Tridwt pl(l11t in GeorKi" /1roduml O. !H NTU ~(f/11mt du,·ing ,m inf/11,nt ,j,ike ,,f 1110 Nl'U.

implcmcmed an effective procedure for use in such i11sta11u"S.

11 9.0 Af(;I) 'fridwt jil,mt in Kokomo, fodia!la, rtd1Jre5 ir{Jn tmd 111tm:;,mese kre/5.

Trident can provide greMer 1ha11 2. '5-log removal, a11d, in some instances, as high as -1-log removal of Cryp1osporidi11111 and Gicirdia lmnblia size p,1n iclcs.

J

COLOR REMOVAL

WA.';TFWATFR RFI I.SF I\ INr>I ISTRIAI

APHl(ATIOl'-1~

M(Jkt·. lklLlcNI oY,lcM, I\Kt Al WUKK

THAM EYER BEFORE

I\ Trit!rnt uw,,- .-y.dw, Jtfftr 82% I!( the fioor rf!ace req11ircd h a 0 .. 5 .-VJG/J mm-wtir,na{ t;w,t1Hrnf system.

OrJ;anic color in surface waters is often mused l.iy humic and fulvic acids which arc lil:sl 1cl110vcd by prccipiracion wi[h mcrnl s.11 t co,1guhmts, like alum or fi:rric salr.s. The resulting lightweight floe is rh,:n •Ju1,:lsly rtm,)ved iu du: T,i,k111.

1irocess, which adsorl.is arid strains 1 ighr Wr'ieh1 llnrs in,., rapid, upflnw prnn'ss

Conven1 ion,11 S}'$tem,; depend cmin:ly u11 a sluw, duwuward .1erding process.

Reclaiming w,1,1 e:wntcr by couvcmional crearnwnt ~yet.cm~ j~ Cl(pcu:;ivc in muny appl1camms. The elJJCiency ut the t\dsorp[ion Clarifiec ,ind .Mixed Mtcdia fi I t1·r rn~b, r1:r1 i,uy w,1stewater filtration cost-effective.

Tridc'.n t tcchnologv can also cost effectively perform boiler wuter pretreat n1ent, pn-iccs:s v.r,1tcr I re,llfrit:'J:Il t1 [1J J-ll1u.-..:

phorus removal hy alum precipit1Hio11.

When water treatment systems are evaJ uated for efficiency, adaptahi Ii ry, ease of operntio11, initial and opcmri ng costs, ,1nd dependable performance rcsul1 s - Trident systems ri~e to the [()p.

Look at how water plams incorporacing Trident technology have dealt with al I kincls or water quality aocl opcrati og concli1 ions. Ask about om Trident pilot

MICROFLOC TRIDENT®

This YomerJ11J01'1h, N.I I., 1,·imn 1' 1 plant t,u,ted ,·im

1t,uJe,, I.ii 1r.1'1iw 1vlu1 /cp,_}J f,l.!m tJ.,r tt-t,•ttaKr.:. i/ JOO ~1il,i1 nn/J.1 J1i In, il,a,1 5 wlv, mo't)., ming 1MI)' p1ilymer.1 :J.I

Jwi111my "nd .wonda,J coawt!antJ.

/Jy redJ1cinx ,·iva- warer'I r9//,irlal 1i!ica, a 'li-idwt .1y.1tem /mun!.r axc,~r p!(tting 9f Jitira on w,hme h!ddn in " l'enwylvm,ia /";w,r pl,ml.

plant program. R.ea<l om case hi.,tories describing how wf'.'vf'; solv~rl rh(: very problems you m«y be facing. At the end of the day, we're coufident rhac you'll look 10 1 he constantly improving Microfloc Trident family of technologies for l1igl1-qtmli1 y, cost-effective water treatment.

CLARIFICATION FILTRATION

ADSORPTION 1 ==1 ===~

10 GPM/FT2 5 GPM/FT2

6 MIN DETENTION FILTER RATE

~ FFFTrlFFP

CONVENTIONAL

FLOCCULATION

30 MIN DETENTION ~ ~-

8 FEET DEEP CLARIF10ATI©N

60 MIN DETENTION

FILTRATION

5GPM/FF

FILTER RATE

I I

OTHER WATER TREATMENT PRODUCTS

If it'i in the watrr, our enginee,·ed procmes and equipment cart take it 01tt, econnmica!ly and dependt,bly. Our wmprehemive line indttd.e.i Jo/utions to simple and wmplex waler treatment and wnditioning need,, all br1cked by working inrtallat;,om and years of e,\,p1::1·iwc£. Ot1r line ind,1dc.r:

■ A<lsorprion Cbrifiers~

■ CONTR i\FI.O'' snlirls rnnrsn dsrifin.,

■ Sl'IR ACONF ,;lutlge lilaJ1kcL d~Lifi,,i,

■ Sludge Su~kcr"' sludge removal .system

■ Sludge lh ickener:;

■ Vertical and hori7onral pr~s.\llrc filters

■ Acr~tor,

■ AliRALATER" p~tketg~d Llc~u"e111.

.'IH/1..J 'l/JL OCK~ mulmlrnin i)'Jlm1

■ MicroDoc Trit!cnr' packa.g~d water treatment

■ MlJLTIWASII~ Filu ... 1iu1t Pr,),6.1

■ Gravi ry fi I rration equipmcm

■ _11.,fULTICRETE ll"' ""'"")idiit urnlcl drnin ~y.c;rFin

■ li.~SD • I ilrrr washcmnghs and launder systems

<:ONT /? i\ rl J )

Sl'Il/ACON E

USFil!r.r products and pron!.Of!..I frir Wdlet· aud WtHtNi'ttf(;f l n 'utmatJ art pnite,;tet/ h)1 p,:/.ltntJ iJ"JJUd ,we/ j,n1ding i11 the United Ylatds i:m.d oth,,.,, <.f)JltJt rit.r.

To finJ out more about how to put USPiltcr to work for you, contact us at

A ~iemens Bu~iness

M·~mrnr, MirrnAoc, ~ncl

Ccncral Filter PwJ ucr., 600 Arrasmith Trail

Ames, IA 30010

515.2(;!l.!H OO pho,u 51 5.268.8500 Jax

44 I Main Street

P.O, Box% Swrhridge, MA 01566

508.317.7344 phone 508 .317 .7019 fax

1728 l'""rtia Su·cct

Colorado Spri n ~s, CO 80915

719,622.5322 phone 7 1 ') .G22.5:l99 /i1x i-,;or more informalion, visit our web site at www.usjilter.com

PUEBLO WEST, CO PROJ ECT:400060

INSTALLATION & ASSEMBLY

INSTRUCTIONS

TRIDENT WATER SYSTEMS

PUEBLO WEST METROPOLITAN DISTRICT

PUEBLO WEST, CO

TRIDENT 1/2TR-840A RETROFIT of WesTech CLARFIER & FILTER SECTIONS

USFilter - MEMCOR DIVISION

441 MAIN STREET

P.O. BOX 36

STURBRIDGE, MA. 01566

(508) 347-7344

PROJECT NO.

400060

3/21/2006

PUEDLO WEST, CO

TRIDENT WATER SYSTEMS

INSTALLATION AND ASSEMBLY

TABLE OF CONTENTS

INTRODUCTION

1. GENERAL INSTRUCTIONS

2. RECOMMENDATIONS FOR HANDLING AND STORING MEDIA

A. Storage I. Mixed Media Filter Materials

2. Adsorption Media

B. Moving Media

3. ASSEMBLY, EQUIPMENT, CLARIFIER/FILTER

A. Check Supplies

B. Tools, Manpower

C. Miscellaneous Assemblies

n. Air Distribution System

E. Influent Distribution System

F. Adsorption Media

G. Adsorption Clarifier Retainer

H. Filter Underdrain Installation I. Concrete Fill

2. Multiblock Laterals Installation

4. HEADLOSS/LEVEL SWITCHES

5. BUtLDING THE FILTER

6. FINAL CHECK~OUT

PROJECT:400060

INST ALLA TI ON AND ASSEMBLY INSTRUCT JONS

TRIDENT WATER TREATMENT PLANT

These instructions cover four TRIDENT models:

l/2TR-840A 1,400 gal/min maximum capacity

This capacity is based on a one-tank system.

Work will be done on the USFilter Microtloc Products TRIDENT water treatment plant which consists of:

1. Removal of existing heavy clarifier media and replace with USFiltcr's buoyant Adsorption Clari fer Media.

2. Removal of all filter components and media and replacement with US Filter Multiblock with Laser Shield direct media retaining underdrain system.

3. Re-enforcing tank shell as required to operate with additional pressures that may develop.

4. Painting of tank interior and exterior.

5. Replacement filtration media.

6. Start-up service and training.

Only the items referenced in the Bills of Material for the drawings in the Drawing section of this Owners Manual are furnished by Microfloc Products.

The Jobsite Superintendent should review these instructions before the arrival of the equipment. THIS REVIEW IS IMPORT ANT. Assembly should not be attempted without first understanding these instructions.

OM\5-0lB

PUEBLO WEST, CO

1. GENERAL INSTRUCTIONS

CAUTION: Be careful when installing equipment and media to avoid damage to the paint. Any paint damage that occurs during installation must be touched up immediately to prevent rusting. Small areas of steel exposed by paint damage inside the tank will rust quickly when submerged.

Padding of some sort is recommended in the bottom of the tank to help prevent paint damage from dirt imbedded in the worker's shoes. Heavy plastic sheet or cardboard may be used. Remove any padding material before installing media or filling the tank with water.

PROJECT:400060

Steel chips from any drilling inside the tank should be removed immediately. Steel chips will cut the paint and become imbedded in shoes, carrying the damage to all parts of the tank. Exposed steel in newly drilled holes should be coated with touch-up paint provided with the plant.

Check for debris inside the underdrain headers in the filter compartments. Any large objects can be removed by hand. Sand or any other debris can be flushed out with a hose.

Do this before placing the tanks.

It is required that there are clean backwash supplies for all media undcrdrains. It is recommended to screen the backwash supply to prevent debris from getting below the underdrains.

PUEBLO WEST, CO PROJECT:400060

2. RECOMMENDATIONS FOR HANDLING AND STORING MEDIA

A. Storage

1. Mixed Media Filter Materials

The filter media for your TRIDENT water treatment plant will arrive in bags, crated and clearly identified. Do not plan on placing material directly from the truck into the filter. The waiting time on trucks and drivers is prohihitive.

Store the bagged material as close to individual filters as possihle. Note that different sized gravels have different colored tags on the bags. Stack all bags with the same colored tag in the same pile. Do not store bagged material directly on the ground, or even on a hard surface. It can be palletized for easy handling by forklift to the filter, if you plan to go that route; but at any rate, it should be elevated to ensure airflow under and around the bags to prevent them from rotting away. Deteriorated bags will cause you trouble and expense at placement time, as the media will have to be shoveled. Do not stack more than five bags high, to avoid breakage. If you cannot store bagged material under a roof, it must be covered to protect it from the weather. Do not use clear plastic sheeting; the sun will rot the bags. Use the black plastic type. It is essential that provision be made, if material is covered, for a flow of air around the stored material, as much of it is damp and the bags will rot if this is not done. An open, roofed shed is an ideal place for storing media.

2. Adsorption Media

Adsorption media is shipped in crates, called gaylords that hold about 900- 1000 lbs. of material. The media is enclosed in plastic liners inside the box. If the gaylords are stored out of doors, make sure that the cardboard does not get wet since this will weaken it. Cover the gaylords with plastic sheeting.

B. Moving Media

Moving bagged material to the filter with a conveyor usually works well as there is no loose material to contend with. If a conveyer is not practical, a forklift or a well-operated loader is good.

The adsorption media gaylords are on pallets and easily moved with a forklift.

•• 3. ASSEMBLY, EQUIPMENT, CLARIFIER/FILTER

A. Check Supplies

Check quantities of all items on the Bill of Material (BOM) with the corresponding drawing. Note that there is a separate BOM for each unit. All nuts, bolts, and washers should be stainless steel or bronze except for those for the lifting lugs (where applicable). Stainless steel hardware is not attracted by a magnet.

B. Tools, Manpower

MisceJlaneous wrenches are required. Drifts to align holes in mating parts to be match-drilled on-site are helpful. You will want ladders and a forklift. Two assembly workers are recommended. Refer to GENERAL section of this instruction for recommended procedures to protect the paint.

C Miscellaneous Assemblie~·

Install the following as shown on the drawings:

1. Pipe plugs for drains (if not already installed).

2. Clarifier drain assembly.

Note that to complete item 2, refer to Field Assembly dwg 4000604051 as required. The suggested installation of a tee, two gate valves and piping to and from the coupling on the tank is by others.

D. Air Distribution System

Next, install the air distribution systems in the clarifier. Web strap type pipe wrenches arc recommended for pipe laterals. "Ridgid" style or chain type pipe wrenches are not recommended but can be used if a lot of care is used to prevent damage to the PVC lateral. One assembly worker can do this job. Refer to GENERAL Section of this instruction for recommended precautions to avoid paint damage. All tools and material should be carefully handed into the tank for the safety of the workers inside and to avoid paint damage by dropped items.

Be sure to use Teflon tape or joint compound on all threaded connections.

1. Install the air distribution header and lateral support pieces(angles) on the brackets welded to the tank bottom. Tighten all fasteners.

2. Make sure that the air header is free from all debris. Jnstall the airwash header as shown on the Equipment Assembly drawing. You will need the victaulic coupling, SS holddown strap and SS hardware (nuts, bolts and washers).

3. Thread the diffusers in each lateral (by hand - no tool is needed). Tighten carefully.

4. Making sure that each lateral is also free of deb1is, thread each into the airwash header. Start each lateral carefully to make sure it is not cross threaded. The latcraJs are plastic and can be ruined easily. Each lateral should screw in one or two turns by hand.

5. Tighten all the laterals c,arefully with the wrench. Thread engagement should be four to eight turns totaJ. The row of diffusers in the lateral must point straight down towards the bottom of the tank when the lateral is finally tight.

CAUTION: Be very careful moving around in the bottom of the tank while installing the lateraJs. The laterals will break if bumped heavily or if they are stepped on.

6. Loosen lateral support angles from brackets welded to the bottom of the tank.

Position support so it supports all laterals in a level plane. Re-tighten support bolts. Place U- bolts over each lateral through support holes an<l secure with fasteners provided. Be careful not to tighten U-bolts too much, as laterals are PVC and can be broken.

7. Remove anything that was used to protect the paint. Touch-up paint any places in the clarifier compartment that look like the paint has been damaged.

Touched-up paint should have a day or so to dry before the adsorption media is installed.

8. Fill the clarifier compartment with just enough water to reach to the seam on the diffusers. Carefully screw the diffusers in or out until they arc all at the same elevation relative to the water surface. BE SURE THAT THE

DIFFUSERS ARE NOT UNSCREWED TO THE POINT OF BEING LOOSE

IN THE LATERAL THREADS. IT IS MORE IMPORTANT THAT THE

DIFFUSERS BE TIGHT THAN PERFECTLY LEVEL.

9. Thoroughly clean the clarifier compartment hcfore installing the adsorption media.

E. Influent Distribution System

Install the influent distribution header and lateral(s) as shown on the FIELD ASSEMBLY drawing 4000604051. you will need to assemble the laterals onto the header). You will need the victaulic couplings, SS holddown straps and SS hardware (nuts, bolts and washers).

PROJECT:400060

1. Be certain that the header and lateral(s) are clean of all miscellaneous dirt and debris.

2. Carefully lower the header and lateral(s) into the clarifier section making note of the orifice orientation, also make note of the lateral arrangement; See detail C-2-2 on the FIELD ASSEMBLY drawing. The center line of the rows of orifices are to be 15 degrees offset from horizontal.

NOTE: Do not assemble laterals onto header outside the tank, as the resulting assembly becomes very difficult to get into the tank for installation.

3. Connect the header with the flex coupling and match drill the holddown strap to the support angle.Connect the header laterals with victaulic couplings to the header). Secure lateral(s) to the support angle using holddown strap(s) and hardware. Once latcral(s) are properly orientated, be certain that the header holddown strap is properly tightened and that the header is rigidly in place.

F. Adsorption Media

CAUTION: The plastic adsorption media is flammable. Exercise great caution.

Do not allow welding or flames of any sort to come into contact with the dry material.

Now you can install the adsorption media in the clarifier. It ships in "gaylords" (cardboard crates), each weighing between 900 and 1000 lbs. It can be placed in any fashion that is most convenient for you. Follow these steps:

I. Before you proceed, the influent valve and the clarifier air inlet valve must be installed and closed.

PROJECT:400060

2. Make sure that the clarifier compartment is totally clean (use a vacuum cleaner) of any debris and that the clarifier drain assembly is installed. Make a final check of the air distribution system to be sure everything is tight and secure.

3. Make some light pencil marks on the interior wa11s at a level of 4 ft. above the floor. You can use these to make sure that you don't place too much media.

4. You must exercise caution to make sure that the air laterals arc not damaged by the impact of fall1ng media. To do this, run one to two feet (no more!) of water into the compartment.

5. As media is poured, a smaJI amount of fine dust may be released. It is recommended that anyone working in the immediate vicinity wear a particle mask to prevent inhaling this material.

6. The easiest way to place media is to raise each gaylord up over the tank on a forklift. Then, cut open one side of the gaylord with a utility knife, and let the material run down into the tank. You will need to cut through the plastic liner also. A garden rake or hoc will come in handy to help remove the media and to move it around in the tank.

7. The following precautions are to be observed while placing media:

a. Be very careful that you don't drop foreign material into the tank with the media. If you do, be sure to remove it before proceeding. Be particularly careful of dropping bits of cardboard, plastic liner, and pieces of the pallet.

b. Be careful to knock off loose pieces of gravel, soil, etc., from the pallet before lifting it up to the tank.

c. Don't scratch the paint on the tank with the forks or with the rake.

d. The media in the tank will not support a person's weight until most of it is in place, since it will be floating on water. You can, however (if necessary), lay down a piece of plywood to stand on, after you have placed about half of the media. Test it with your rake first to make sure that the media is solid.

8. Pour the media in. Go slowly at first, until the air distribution laterals are covered. Add media until you reach the marks you made on the walls. The media need not be leveled except to help you judge the overall depth. The depth is not extremely critical; plus or minus 1-2 inches is okay.

G. Adsorption Clarifier Retainer

l. Make certain that the proper quantity of media is placed and that there is no foreign material or debris in the clarifier compartment. Make a last second check of the paint.

2. Identify all of the pieces shown on the Field Assembly drawing. It is good to lay them out on the floor first to check the arrangement and fit before lifting them into the tank. You will need the retainers, holddowns, gasket material and hardware (nuts, bolts and washers). It is recommended that you don't take the hardware into the tank until the retainer is placed so that you don't drop any into the media.

3. Install gaskets on the supporting angles (1/4" thk.) all around. Also affix gaskets (1/2" thk.) to side(s) of center grating panel(s) so that there is one strip of gasket material between the panels. Do not forget to spray the edge of the grating with the glue provided--follow instructions on the can.

4. Lift the grating sections into the tank. Depending on the size of the tank, they may require a forklift (or overhead crane) to bring them up. lnstall these one by one onto the support angle, the center piece(s) being squeezed between the two end pieces. Note screen faces down!

Make sure you push laterally at each end so that the center gaskets are properly sealing the gaps between grating panels.

5. Bring hold down angles and hold down beams as required (2 or 4 per tank depending on tank) into the tank and position them as shown on the Equipment Assembly drawing.

6. Install the hold down elements. These consist of a piece of threaded rod (3/4" or l" dia.) nuts, and appropriate washers, which attach to gussets and brackets welded to the tank wall. Also install the stainless steel pads provided at the point where the rod will bear on the angle.

a. Insert rod first through hole in gusset, install washer and nut wider tbe gusset.

b. Install washer and two nuts above the gussets. Tighten the two nuts together at some distance from the gusset.

c. Tighten nut under gusset while holding top nut above gusset to prevent rod from turning. This will move the rod down, and apply pressure on the hold down angle (do not forget stainless steel pad to prevent paint damage to the angle).

d. Tighten until the gaskets on the support angle are getting compressed by about 1/8".

e. Loosen double nut on top of gusset and tighten the bottom one against the top surface of the gusset. The remaining nut can be removed or better tightened against the nut under it so it is not lost.

H. Filter Underdrain Installation

CAUTION

Read entire instruction before installing this underdrain system. If instructions are not followed in detail, the underdrain may be structurally unsound and distribution may he adversely affected.

NOTE:

NOTE:

American Concrete Institute (AC[) specifications must be adhered to when creating, placing, and working concrete unless other methods are expressly documented in this manual. ACI 305 "Hot Weather Concreting" must be followed when installing underdrains at temperatures above 80° F (26. 7° C) and A Cl 306 "Cold Weather Concreting" must be followed when installing underdrains at temperatures below 40° F (4.4° CJ to prevent cracking.

Underdrain should be placed in a timely fashion to prevent unnecessary curing before installation is complete. This is especially a concern when placing concrete in locations with hot weather or low relative humidity.

1. Concrete Fill

Prior to installation of the underdrain ]atcrals, concrete fill must be placed in the bottom of the tank. Refer to the FIELD ASSEMBLY drawing. A similar view is shown on the FILTER MEDIA DESIGN drawing.

a. Inspect the interior of the underdrain plenum and remove any dirt or debris that may have accumulated. Cleanliness of the underdrain system is very important to the future life of the filter.

b. Once the plenum interior is clean, temporarily cover the open ends of all the drop tubes (also called riser pipes).

c. Place the concrete fill to the depth shown on the Unit Assembly drawing (flush with the top of the plenum), trowelling the surface level so that the overall length of the finished concrete is smooth and level to+/- 1/4" (this is necessary for proper underdrain seating and hold-down). Be very careful not to get any concrete into the plenum, even though the drop tubes are covered.

d. While finishing the concrete, thoroughly clean any concrete spatter from the outside of the drop tube before it hardens. The outside of the drop tube must be smooth, clean, and free of any nicks or gouges in order to form an acceptable seal with the underdrain.

NOTE: DO NOT PROCEED WITH UNDERDRAIN PLACEMENT IF

TIIE ENDS OF THE DROP TUBES ARE NOT BEVELED ON THE

OUTSIDE. CONTACT USFilter FOR INSTRUCTIONS.

2. Multiblock Laterals Installation

The following steps will insure a proper installation of the laterals, provided that the concrete fill has been correctly installed as described above.

a. Refer to the FIELD ASSEMBLY drawing.

b. Preliminary Procedures

USFilter includes field service time to allow for an inspection of the underdrrun placement. Arrangements for this inspection should be made by the contractor so that the inspection can be made prior to the base concrete (base grout) pour.

The contractor shall install the filter undcrdrain in strict accordance with this manual and installation drawings provided.

Before proceeding with any work inside the filter compartment, remove any construction debris, dirt and sand from inside the compartment.

Inspect the interior of the pknum and flush out any debris, dirt or sand from inside the plenum.

Underdrains must be level. Each lateral should be level to within 3/16".

Between laterals, the level should be within+ 1/4" from grade across each filter basin. Levels should be taken at the center of the various blocks. The concrete fill should have eliminated any unevenness that may be inherent in the tank floor and/or tank pad. If resulting floor is 1" or more out of level, it is recommended to level low spots before commencing installation. Ifleveling is required, grout must be allowed to set before commencing installation.

CAUTION

The filter basin concrete floor should have a broom finish or rougher. Finer finishes could prevent adequate bonding of the base grout to filter basin floor ( concrete fill).

The installing contractor must follow the recommended precautions found in this document to ensure that the underdrain system is clean and free of debris that couJd clog the underdrain system or otherwise impede backwash distribution.

Filter basin sha]l be swept and vacuumed, to remove dirt and debris, prior to commencing underdrain placement. Backwash supply and air piping must be thoroughly cleaned.

Cleanliness must be maintained throughout the installation of the underdrain.

It is recommended to locate a grade line around the perimeter of the basin that will represent the top of the undcrdrain block ( excluding media retaining cap). This grade line will need to be located l '-1 1/4" vertically from the top of the concrete fill. In addition to the horizontal grade line vertical lines on lateral centerlines should be placed on the end walls to facilitate alignment of the laterals.

c. Block Storage Before Installation

The underdrain blocks are manufactured of black High Density Polyethylene and therefore have…