ADDENDUM NO. 4

BID DOCUMENTS FOR 5/7/2019

SOOKE LAKE INTAKE TOWER REMEDIATION FILE: 115618065

TENDER #: 2019-492

ISSUED BY:

Bryan Gallagher, P.Eng.

Stantec Consulting Ltd.

Tel: (250) 388-9161

Fax: (250) 382-0514

Bryan.gallagher@stantec.com

Addendum issued to active tenderers with documents on record (6 page, no attachments)

Clarifications and Additions:

1. Given the amount of new data and additional scope related to Addendum #1, bidder

requests a one (1) week extension to the closing date of the Invitation to Tender.

A: Refer to Addendum No. 3 for details on extension to tender close date.

2. Specifications refer to using AB Control Logix PLC. Drawings indicate a Motorola RTU to

perform plant control. Please clarify the intent.

A: Motorola Ace RTU is required. There is no requirement for a PLC on this project.

Specification Section 25 14 00 is revised as follows: Delete clauses 2.6 and 2.22.4.

All remaining references to a PLC shall be understood to refer to the Intake Tower RTU.

3. Specifications refer to a water treatment plant, UB control systems, raw water pumps, remote

HMIs, etc. What is meant by these descriptions?

A: Specification Section 25 14 00 is revised as follows: Delete clauses 2.7, 3.2.1 and 3.2.2.

Specification Section 25 05 01 are revised as follows: Delete clause 1.1.5.

4. Summary of work indicates removal of existing GE MDS SD4 radio modem. Drawings indicate

to connect GE MDS Orbit LN9 MCR to new RTU CPU. Spec indicates this radio to be provided

by Victoria Mobile Radio. Please confirm this radio is new and to be purchased by this

contractor from the vendor noted.

A: This radio is new and VMR is the CRDs preferred vendor. The Contractor may submit

information from alternate suppliers to the consultant for approval. Approval of alternate

suppliers will be granted at the discretion of the consultant and the CRD.

5. Specs indicate programming of RTU and HMI by this contractor. Please provide

details/control narrative and other information reasonably required to determine the cost of

this programming work.

A: CRD have decided to undertake the programming of the RTU themselves. HMI will be

programmed by the CRD as per Addendum 2 item 17.

Specification Section 01 11 00 is revised as follows: Delete clause 1.3.7.

Specification Section 25 14 00 clause 3.7.3 is revised as follows: PLC and HMI programming is

the responsibility of the Contractor. Programming will be based on the work package and

operation requirements of the City. Programming of the HMI and RTU will be performed by

CRD IWS personnel. The Contractor and install, test and commission the RTU as required to

allow programming by the CRD.

Specification Section 25 14 00 clause 3.7.4 is revised as follows: Delete items 3, 4, 5 and 9.

Specification Section 25 14 00 is revised as follows: Delete clause 3.7.6

6. Drawing E101 shows a single 6” conduit running from generator bldg. to intake structure.

Pictures appear to show one 6” conduit with teck cable and one 6” conduit with 2-

communications cables. Cable schedule seems to indicate that 1 new 25 pr cable (gauge

not given) and 2 new teck cables will run in existing 6” communication conduit. Note 5 on

E101 seems to confirm this method, however note 5 indicates replacing existing 6 pr cable

with one new 6pr cable and five Cat 5e cables. There is no mention of Cat 5e cables in the

tender breakdown or cable schedule, only 25pair “structural” cable. Further, drawings seem

to show this 25 pair cable is just coiled (with 10m loop) at each end.

Please confirm what the intent is for new cables, and confirm that existing communications

cables can be removed without disrupting or shutting down any services that need to be

maintained.

A: There are two 6” conduits from the generator building to the intake tower, one being used

for the existing Teck cables for 480V and 120/240V cables. the second 6” is being used for

communication only. The communication only conduit was proofed. This communication

conduit shall be used to pull two new Teck90 cables, one for power and one outdoor rated

25pairs of Category 5e backbone. All existing cables in this conduit to be pulled out and

disposed. Shutdown and disconnection of equipment to be coordinated with CRD prior to

disconnection.

Revise note 5 on E101 to reflect the removal of existing communication cables and the run of

new 25 pair Category 5e in lieu of 6pr and 5 multipair Cat5e. New 25pairs to be coiled on

both ends with sufficient service loop as indicated. Cables to be tested prior to hand over by

the contractor (termination is required for testing purposes only, this can be done on patch

panels on both ends, leave service loop on both ends as indicated and coil above the

patch panels on 4” J-hooks).

The multipair cable is intended for future use. We understand cable length might be an issue,

test results will be reviewed and if any issues arise as a result of the cable length it will be dealt

with at that time.

7. The generator receptacle installed connected to intake panel 1-DP-2E1 is noted as being

rated 30A 2P on drawing E601, however the detail 5/E500 appears to indicate a 4P 200A arc

tite style. Please confirm which is correct.

A: Reference to this receptacle shall be 4A/4B/E500 (100A, 3W, 1Ph receptacle).

Details 3A,3A/E500 to read 4W in lieu of 3W

8. The method of generator transfer shown at intake panels (interlocked breakers) is commonly

used in industry, but may not meet the requirements of a CSA approved transfer switch. Has

CRD/Stantec investigated the use of this design with AHJ?

This is a common practice for plug-in type generator. If required, a variance will be submitted

to the AHJ for this installation prior to the shop drawings approval.

9. The tender breakdown has two items that refer to “Utility coordination and install”. Given

that all the utility should need to do for this project is provide new CTs for the new single point

of metering, could CRD/Stantec just provide a provisional amount for this item? (this

comment/question assumes that CRD owns a primary switch on their private distribution line)

BCH shall shutdown their primary.

A: No cash allowance, the coordination to be carried under the base bid, BCH is required to

disconnect BCH primary disconnect at Sooke Lake Rd near Shawinigan Lake Rd before the

private line (located in the right of way) to safely perform the work and to coordinate CT and

meter installation. Before energizing BCH have to inspect the installation to provide

acceptance for powering the transformer.

10. At intake, there is a significant amount of demolition that must occur before new equipment

can be installed, including wiring to all gates and actuators. Addendum #1 states that a

maximum of 6 hours can be arrangement for outage. Is there an opportunity for the intake

tower to be operated manually for a period longer than 6 hours to allow for demolition and

re-installation?

A: Detailed shutdown plan shall be submitted by the successful contractor for review after

award. Some equipment can tolerate shutdown longer than 6 hours; however, this will need

to be coordinated with CRD staff during construction. Temporary power, from the portable

generator, should be utilized to run specific equipment to accommodate any extended

shutdowns. staged equipment shutdown is expected to provide minimal operation

interruptions.

11. At intake, please clarify the relocation of existing splitter at ~ EL 618’. This splitter seems to be

in the same location as existing? Further, please clarify the intent of this splitter. If it is a

transition between teck and conduit in slab (per note 3 E130), are there to be terminals

added in the splitter? Please clarify/quantify the new teck to be run from this splitter.

A: Existing 480V splitter is located above existing 480V CDP to distribute power throughout the

tower. The intent is to run new teck90 cables from the new MCC to the splitter as shown,

where conduits run in the slab they will be re-used. Run new teck cables to the splitter and

use the splitter to transition to in-slab conduits via RW90 and run the power to each piece of

equipment as shown on SLD. Refer to photo P2 om E103 that shows existing rigid conduits

location in the slab. The existing splitter is not secured to the building structure, the contractor

shall secure the building structure prior to re-use.

12. At intake, please describe the location (or elevation) of the valve actuators.

A: Add Detail 4 ‘Existing Intake Tower and Conduit Section’ to drawing E-101 (image below).

Existing butterfly valve actuators are located at approximate elevation 557’ in the drywell.

13. At intake, do new conduits from new splitter (installed over existing conduits into RTU) need to

match quantity of existing conduits, or can circuits be grouped in larger conduits (with

appropriate derating of conductors)?

A: Larger conduits with appropriate derating as per CEC 22.1 is acceptable.

14. Gate and valve actuator quantities seem to be inconsistent among drawings. (E604 refers to

quantity of 12 in key note 9). RTU DI, cable schedule and single line drawings appear to show

a total of 6 gate actuators and 4 valve actuators, while RTU DO drawing appears to show 8

gate actuators and 4 valve actuators. Please clarify.

A: There are 6 electrically actuated gates.

There are 2 hydraulically actuated gates, with a dedicated control system that accepts

control signals from the RTU.

There are 4 electrically actuated valves.

15. Drawings E604 and E605 seem to indicate 8 control wires from either Rotork or EIM actuators

to RTU. Cable schedule (E603) shows running 7 new wires. Please clarify.

A: Allow for 8 new wires, drawing E603 schedule to read 8C in lieu of 7C

16. RTU cabinet BOM shows a “-“ (dash) as the quantity for new radio modem. Please confirm

intent. Spec indicates this new modem is to be provided by this contract.

A: New radio modem is required. Allow for 1 No. new radio, drawing EI601 to be read ‘1’ in

lieu of ‘-‘ (dash).

17. We would like to request a one (1) week extension to the closing date of the Invitation to

Tender.

A: Refer to Addendum No. 3 for details on extension to tender close date.

18. Regarding duct bank shown on drawing E101

a. What is the approximate length of the duct bank.

A: Drawing E101 is to scale, length of duct bank to be as shown on the drawings (from

generator building to the pole riser C/W pilaster as shown.

b. Will there be more than 1 conduit in the duct bank.

A: Allow for a second 2” RPVC conduit in the trench, conduit to be stubbed up to the

pole and capped off for future. Install a pull string for future.

19. In Section 01 11 00, 1.3.3.1.4 there is a note …”and then pressure-wash clean the interior of

the dry well.” Some clarifications / questions related to this note:

a. At what stage does the pressure wash happen, after crack repairs as noted?

A: Contractor to complete pressure washing after crack repair, to remove residual

polyurethane and evidence of previous leaks.

b. Will the dry well submersible chamber be isolated and locked out?

A: The dry well does not have a submersible chamber. The wet well access is a

manhole cover in the floor of the Intake Tower mechanical room. The wet well

manhole cover does not have a lock. The wet well is not to be accessed as part of

this project and the manhole cover may not be removed by the contractor.

c. Does the pressure-wash clean include columns, beams, stair case, etc or is it only the

immediate area around the crack repair(s)

A: The “pressure-wash clean” only refers to the concrete walls. Other components are

not specifically required to be pressure-wash cleaned, except as required to clean

excess polyurethane drips and spills.

The area requiring cleaning is not limited to the areas of repair. Evidence of previous

leaks are also required to be pressure-wash cleaned.

d. Can the pump chamber be used as a waste water collection point and cleaned out

at the end of the task.

A: Yes. The pump chamber at the bottom of the dry well can be used as a waste

collection point for the pressure-wash cleaning operation. All equipment in the pump

chamber must be protected by the contractor. All waste water must be removed

from site by the contractor.

20. Who at BC Hydro (Duncan Office) was contacted regarding purchase of transformer,

nobody in the Duncan office seems to know about it.

A: Contractor to revise all requirements to purchase transformer from BCH to be privately

sourced. Specifications and capacity to remain as per contract documents. For BCH

coordination during construction, contact Scott Henderson (250) 755-4756 or

Design.dcn@bchydro.com.

21. The spec, under the control panels section refers to an Allen Bradley PLC, while the drawings

show the Motorola Ace? Can you confirm.

A: Motorola Ace RTU is required. There is no requirement for a PLC on this project.

Specification Section 25 14 00 is revised as follows: Delete clauses 2.6 and 2.22.4.

All remaining references to a PLC shall be understood to refer to the Intake Tower RTU.

Also within the CP section, there’s referral to Raw Water Pumps and Trojan UV filters and

corresponding Allen Bradley PLC’s and HMI’s inclusive of programming, it appears to be part

of a past project, can you confirm.

A: Specification Section 25 14 00 is revised as follows: Delete clauses 2.7, 3.2.1 and 3.2.2.

Specification Section 25 05 01 are revised as follows: Delete clause 1.1.5.

22. Can you confirm, is the CRD programming the PLC and HMI and are you requiring and

licences or software purchase for the Siemens HMI or Motorola Ace as shown on the

drawings.

A: Confirmed the CRD is programming the RTU and HMI. No licenses for this are required to

be provided by the Contractor.

23. The drawings call for an Always On UPS and Bypass, I believe these products are no longer

wanted by the customer, are Liebert or Eaton Powerware acceptable alternates?

A: Liebert GXT4 and Eaton Powerware are acceptable alternatives.

24. Please inform us on the outlet (location, treatment etc) of the existing sump at the bottom of

the dry well.

A: The outlet for the existing sump at the bottom of the drywell discharges to one of the

empty mains leaving the Intake Tower. Note that this discharge is only appropriate for clean

water.

25. 26 32 1- Part 2 2.1: Is Kohler an acceptable Genset Supplier, Kohler has been acceptable in

all the recent projects for the CRD.

A: Yes, Kohler is an acceptable alternate.

26. To erect the steel, we will need to position a large crane close to the entrance of the access

bridge. Could you provide use with the width of the roadway?

A: The crest of the bridge is 7.3m wide. A picture is provided below for reference. Crane

details (weight, outrigger loads and locations, etc) will need to be submitted by the

successful contractor. Crane information will be reviewed by the consultant to ensure that

the dam structure is not compromised.

Distribution:

Capital Regional District Integrated Water Service to post on the bid site