Oil1TURONTOfiiEiièIPiE[h6i3kT uchasing andiiateiai A Idñ1i KèiiöiDirector City HaN, 1 R’ Ftoor, West Tower Manager

100 Queen Street West Constructron Servrces

Toronto, Ontario M5H 2N2

October 20, 2017

Reply to: Michael Porcarelli Via Website Posting: 10 PagesTel: (416) 338-5585

Addendum No. 3

Tender No. 285-2017

Re: Cooling Tower Replacement at City of Toronto Office of Emergency Management locatedat 703 Don Mills Road, Toronto.

Closing Date: 12:00 P.M. Noon (Local Time). October 23. 2017

Please refer to the above Tender Call document in your possession and be advised of the followinginformation:

1. Clarifications1.1 All hoisting costs to be included in cost ‘M. Do not include in items ‘A through ‘L’.

State how many hoists allowed for in cost ‘M’.

1.2 Building cooling and condenser water system piping to be stainless steel to matchexisting. See SPECIFICATIONS section of this addendum.

1.3 Building heating piping to be black carbon steel 5A53 Grade B.

2. Specifications2.1 Add Specification Section 15183:

Section 15183 STAINLESS STEEL PIPE AND FITTINGS — COOLINGas attached hereto.

3.3.1 Revised cover page attached.3.2 Revised M1.01 attached with updated Drawing List.3.3 Drawing M13.17 DELETED.

3.4 Drawing M13.18 revised, as attached.3.5 Drawing M13.21 added, as attached.

Con tin

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4. General Clarifications to Questions from Bidders

Q1. Pipe specification—since the entire new cooling system that was renovated a fewyears back are all in stainless steel piping. Is there a requirement for installing thesame material? As of now, the specification calls for standard schedule 40 black steel.Please confirm.

Al. See ‘Clarifications’ section of this addendum. Cooling and condenser system piping isstainless steeL

Q2. Crane allowance for delivery for all twelve (12) separate pricing scope breakdown:2 5PECPIt4E*0NS

21 tTS

2 1,1 And S b-SecSen 32 HOISTtNG. alden32 KOSTNG

32.1 btv[sdn iS Contractor to r ponttbro tor or hotoirnorOdrion 15 enent.

32.2 DMsi,n 15 C tractor to co-ordn&e troiotrn wh GenoratCeairadc (or Butn Rett ency Proed,

32.3 AU Otwtoton 15 htooltng In be M weekend,, and cadThotede,’rlh Factory M nae’r and Cenera Conlractor for SuUtoRe,rtenty Pcoject

32.4 Subml Kntdn Prance Factoty Mdna5er.. no ieas trron 113rtrktng baa, before planned htoflng date,

32 5 Prortok at necceadry barheedas. dtoerSIOnC. and hoardtncot hcrhing operatton,

32,6 c4nlmun, 011 $dob, eperaton to be canted In pflcUrr3

Secuon 3 —Tcndcrsubmls&en PackagePrIcing Foim

TenterCottor. 205.2017 Cortraci.No. WA ktwwtrn3tn 12,2OTI

cIa EquIpment (Cranest S

With the issuance of addendum #2 and adding a line item for Hoisting Equipment(Cranes), we are to assume that all crane costs will be added to this specific breakdownand nothing on any of the 12 separate scope. Please confirm.

A2. This is correct. See ‘Clarifications’ section of this Addendum.

Q3. Are we responsible for any asbestos abatement if required?

A3. No. The Owner (City of Toronto) is responsible.

Q4. For Series 9, Replacement of Glycol Heat Exchangers etc, please indicate thepercentage of glycol concentration for filling purposes.

A4. 40%.

cc,Continfl!tP?5ntftkrpttge...

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05. The bid documents mentioned that the Warranty is three (3) years. However, theCCDC contract attached only mentions two (2) years. Kindly clarify.

A5. Warranty is three (3) years. CCDC Documents for construction contract will beamended accordingly

06. Is the roofing still under warranty? Kindly provide the roofing contractor if it is.

A6. Roofing is not under warranty

07. Existing wiring and communication cables attached to Cooling Tower structure andscreens. Who is responsible for removing and reinstallation of these wiring?

AZ The Contractor is to have his electrical (or communications cabling) sub-contractorrelocate and reinstall communications antennae and wiring.

08. We would like to request if you could extend the closing date to at least the end ofnext week.

A8. Due to time constraints the closing date will not be extended.

09: The Specification names BAC for the cooling tower. Are alternatives acceptable?

A9: The cooling tower replacement is a deferred portion of the cooling plant upgradeproject (20 73-2076). As such it must be exactly the same as the 2 cooling towersreplaced under that project — SAC

010: Could you please let me know which company is taking care of antenna and disheson this building? And what is this antenna for?

A 10: Refer to information in above A7. Antenna is for building communications purposes.

Please note that the Deadline for Questions has passed.

All other information regarding the call document is unchanged. All other terms and conditionsremain the same. Should you have any questions regarding this addendum contact MichaelPorcarelli, Corporate Buyer, at email Mjrfi.el.Porcarellitoronto.ca.

DC,Continued on next page...

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Please attach this addendum to your Request for Tender document and be governed accordingly.Bidders must acknowledge receipt of all addenda on the space provided on the Tender Call CoverPage as per the Process Terms and Conditions, Section 1, Item 9 - Addenda, of the Tender Calldocument. All other aspects of the Tender remain the same.

Yours

fitTunornç:

LJoanne Kehoe,Manager, Construction Services,Purchasing & Materials Management

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City of Toronto Section 15183 703 Don Mills Road – Additional Mechanical Work STAINLESS STEEL PIPE AND FITTINGS – COOLING SNC Project 2016-637189 Page 1 of 3 1. GENERAL 1.1 Read Mechanical General Requirements, Section 15010 as part of this Section. 1.2 Read Valves – Heating and Cooling Section 15502 as part of this Section. 1.3 Provide steel pipe and fittings in accordance with this Section for systems where working temperatures are in

range of -10 deg C to 120 deg C (14 deg F to 250 deg F) and working pressure up to and including 1035 kPa (150 psi). This Section covers piping and fittings for: .1 Chilled water system. .2 Condenser water system.

1.4 Shop drawings

.1 Submit shop drawings where pipe assemblies with fittings, elbows and flanges are shop prefabricated. 1.5 Reference standards

.1 Latest edition of ANSI B31.1 1.6 Registration

.1 All fittings to be CRN registered. 2. PRODUCTS 2.1 Stainless steel pipe - general

.1 Pipe to be Type 304 or 304L stainless steel to ASTM-A312 “Seamless and Welded Austenitic Cr-Ni alloy steel pipes”.

.2 Maximum carbon content to be 0.03%.

.3 Schedule to be Schedule 10S or Schedule 40, as required.

.4 Piping to be marked and mill certificates for piping batch to be supplied.

.5 Piping to be made in tube mill and welded using TIG process with inert (argon) gas purging, without filler wire. Weld joints to be full penetration welds without using filler metal.

.6 Piping to be cleaned of all scale, rust, grease, and weld spatter, both inside and outside.

.7 Piping to be annealed and passivated, and rinsed with clean water and dried.

.8 Pipe cleaning and passivation to be to ASTM A-380 “Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems”.

.9 Pipe dimensions to conform to ANSI B39.19.

.10 Pipe out-of-roundness permissible variation in outside diameter to be as per ASTM A-530 “Standard Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe”.

.11 Each pipe length to be straight to within 1/8 in over 20 ft length.

.12 Minimum wall thickness of pipe at any point, to be NOT less than 95% of nominal wall thickness for pipe Schedule.

.13 Piping to be delivered as plain end pipe with pipe ends enclosed in caps. Where pipes are delivered pre- bevelled for welding, prepared ends to be protected with caps.

.14 Welds between Schedule 10S sections to be full penetration V-butt welds.

.15 Clean weld joint of weld spatter and discolouration. 2.2 Stainless steel pipe up to NPS 2

.1 Type 304 for threading, Type 304L for welding. .1 Schedule 40 for welding. .2 Schedule 80 for threading.

2.3 Stainless steel pipe NPS 2.5 and over

.1 Type 304L for welding. .1 Schedule 10S.

2.4 Fittings

.1 Fittings up to NPS 2, for instrumentation, or flushing/sampling ports. Connecting pieces to be threaded or socket welded.

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City of Toronto Section 15183 703 Don Mills Road – Additional Mechanical Work STAINLESS STEEL PIPE AND FITTINGS – COOLING SNC Project 2016-637189 Page 2 of 3

.1 Threaded: Type 304 stainless steel, Class 150, to ANSI B16.3.

.2 Socket weld: Type 304 stainless steel, Class 3000 to ANSI B16.11.

.3 Standard of Acceptance: • Camco • Ward • Pinnacle

.2 Butt weld fittings .1 150 lb Type 304L stainless steel to ASTM A-351 “Standard Specification for Castings, Austenitic,

for Pressure Containing Parts”. .2 Dimensions to ANSI B16.3. .3 Schedules as indicated on drawings. .4 Standard of Acceptance:

• Camco • Ward • Pinnacle

.5 Flanges to be weld neck type.

2.5 Flanges .1 For connection of flanged components, and for di-electric separation of dissimilar metals. .2 Type 304L stainless steel to ASTM A-351, ASTM A-743, ASTM A-744. .3 Schedule 10S weld neck flange, ANSI Class 150 to ANSI B16.5. .4 ANSI Class 150 bolting pattern to mate with ANSI Class 150 raised face flange.

2.6 Joints

.1 Flanged joints .1 Joints at valves, or end terminations as indicated to be flanged. .2 Where connecting to black steel flange, provide dielectric separation of other material and

stainless steel flanges. .2 Threaded or socket weld joints

.1 For instrumentation or flushing/sample ports. .3 Butt welds

.1 Welding procedures to CWB standards.

.2 Welding of stainless steel sections to be by MIG or TIG welding.

.3 Provide welding protocol and TSSA WPS conformance as shop drawings submittal.

.4 Provide weld preparation diagrams as shop drawings.

.5 Welds between Schedule 10S sections to be full penetration V-butt welds.

.6 Clean weld joint of weld spatter and discolouration. .4 Fillet welds

.1 To be used for tack welding.

.2 To be used for attaching instrumentation couplings.

.3 Parts attached by fillet welds typically to be welded all around.

.4 Fillet welds minimum 3/16 inch.

2.7 Elbows and tees on steel pipe where welding is employed .1 Wall thickness not less than that of pipe with which they are used. .2 Long radius type elbows. .3 Prefabricated welded tee fittings where branch connections are same size as main. .4 Prefabricated welded tee fittings or welded outlet fittings where branch connections are smaller than

main. 3. EXECUTION 3.1 Piping installation

.1 Piping NPS 2 and under to be threaded or socket welded.

.2 NPS 2 1/2 and larger to be flanged, or welded.

.3 Connect to equipment with unions and threaded fittings where connections are NPS 2 and smaller; and flanged connections where connections are NPS 2 1/2 and larger.

.4 Slope main piping up in direction of flow 1:1000 (1/8 in in 10 ft).

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City of Toronto Section 15183 703 Don Mills Road – Additional Mechanical Work STAINLESS STEEL PIPE AND FITTINGS – COOLING SNC Project 2016-637189 Page 3 of 3

.5 Use eccentric reducers at pipe size changes arranged flat on top to assist venting.

.6 Provide clearance and access for maintenance of equipment, valves and fittings.

.7 Ream pipe after cutting to length and clean off scale and dirt inside and outside of pipe before assembly.

.8 Cap ends during construction to prevent entry of foreign matter.

.9 Make-up joints in threaded pipe with joint compound. 3.2 Pressure testing

.1 Where piping is pressure tested against valve, close valve with blind flange. Blind flange to have NPS 1/2 600 WOG ball valve for pressure relief.

.2 Where piping is tested against blind flange, blind flange to have NPS 1/2 300 WOG ball valve for pressure relief and gauge attachment.

.3 Hydrostatic test to 150 psig for minimum of 6 hours. Pressure to hold without loss or pumping. Pressure testing to be witnessed by Consultant, and Facilities Manager or his designee.

3.3 Flushing and cleaning See other Sections of this Specification.

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