Engineering & Operations Committee Item 8-2 February 11, 2019

Award $16,452,832 contract to Baker Electric, Inc. for replacement of the CRA’s 6.9 kV power cables at all five pumping plants

February 11, 2019 E&O Committee Item 8-2 Slide 2

Hinds

Iron Mountain

Intake

Gene

Eagle Mountain

February 11, 2019 E&O Committee Item 8-2 Slide 3

Item 8-2 Slide 4 E&O Committee February 11, 2019

6.9 kV Power Cables Replacement

Lodge Upgrade

Kitchen Upgrade

Surge Chamber Dis-charge Bypass Covers

Flow Meter Replacement

Generator Replacement

Main Pump Rehabilitation

Overhead Crane Refurbishment

Auxiliary Power System Rehabilitation

Seismic Evaluation of Bldgs.

O&M Vehicle Canopy

Concrete Panel Repairs

Potable Water Replacement

Sewer System Replacement

Asphalt Replacement

Renovation of Houses

Delivery Line Refurbishment

Circulating Water and Sump Discharge Piping Systems Rehabilitation

Transformer Replacement

New Storage Bldg.

UPS Replacement

Spillway Auto Rejection

Refurbishment

Iron Mountain Pumping Plant

CRA 6.9 kV Power Cables Provide power to main pump motors

Original construction in operation for 60 to 80 years

Cable design has multiple copper conductors, oil & paper insulation, & protective lead outer coating

Cables travel through conduit & small tunnels

Cable lengths vary from 200 to 650 feet

Total length of cable at 5 Pumping Plants is 48,200 feet February 11, 2019 E&O Committee Item 8-2 Slide 5

Cable Tunnel Pump House

Switch House

February 11, 2019 E&O Committee Item 8-2 Slide 6

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SLP

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Cable Trays

Factors impacting cable replacement

Arranged by pump unit and in close proximity to each other

Installed on each side of small tunnel (6 ft. wide)

Insulation layers starting to crack & leak

Cables being replaced must be de-energized

Need for protective barriers to isolate energized cables

Remediation of hazardous materials February 11, 2019 E&O Committee Item 8-2 Slide 7

Stacked Cables

Temporary Safety Barrier

Small Work Area

6’

Energized Cables

February 11, 2019 E&O Committee Item 8-2 Slide 8

CRA Pumping

Portion of work completed during regular scheduled annual CRA outage in 2020 (1 month)

Reduced flows – up to 5 units unavailable during cable replacement

12 weeks in 4th quarter of 2019

9 weeks in 2nd quarter of 2020

Flexibility to defer work to accommodate developing water supply scenarios

February 11, 2019 E&O Committee Item 8-2 Slide 9

Replace 6.9 kV power cables Install and terminate cables

Modify copper busses at switch house and pump house

Refurbish cable trays

Abate hazardous materials

Rehabilitate tunnel ventilation, cooling, and lighting systems

Repair tunnel cracks

Furnish and install temporary station power

Cracks to be repaired

Cable terminations

February 11, 2019 E&O Committee Item 8-2 Slide 10

Metropolitan force activities High-voltage switching and clearances

Isolation and grounding of electrical equipment

Testing and system startup

Support activities Construction and fabrication inspection

Contract administration and PM

Submittals review and record drawings

February 11, 2019 E&O Committee Item 8-2 Slide 11

Bids Received: Dec. 21, 2018

No. of Bidders: 1

Low Bidder: Baker Electric, Inc.

Low Bid: $16,452,832

Engineer’s Estimate: $18,400,000

SBE Participation*: 24%

*SBE participation level set at 10%

Specifications No. 1809

February 11, 2019 E&O Committee Item 8-2 Slide 12

Contracts Baker Electric, Inc. $16,452,832

Labor Metropolitan force activities 1,962,000 Construction inspection 2,857,000 Submittals review and record drawings 939,000 Contract administration and PM 615,000

Remaining Budget 1,074,168 Total: $23,900,000

Total construction cost: $18,414,832

February 11, 2019 E&O Committee Item 8-2 Slide 13

Construction Board Action

Completion

CRA 6.9 kV Power Cables Replacement

Shutdown

Reduced Flow Period

February 11, 2019 E&O Committee Item 8-2 Slide 14

Option #1 Award $16,452,832 contract to Baker Electric, Inc. to replace the 6.9 kV power cables

Option #2 Do not proceed at this time

February 11, 2019 E&O Committee Item 8-2 Slide 15

Option #1

February 11, 2019 E&O Committee Item 8-2 Slide 16