Upload
others
View
0
Download
0
Embed Size (px)
Citation preview
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
`
1
2
3
4
5
SLP
6
7
8
9
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