HomeMy WebLinkAbout04.a. Receive update on completed Change Order for emergency work at the treatment plant (Primary Sedimentation Tank Repairs)Page 1 of 5
Item 4.a.
Central Contra Costa Sanitary District
November 7, 2017
TO: ENGINEERING AND OPERATIONS COMMITTEE
FROM: EDGAR J. LOPEZ, CAPITAL PROJECTS DIVISION MANAGER
REVIEWED BY: JEAN -MARC PETIT, DIRECTOR OF ENGINEERING AND TECHNICAL
SERVICES
ROGER S. BAILEY, GENERAL MANAGER
SUBJECT: RECEIVE UPDATE ON COMPLETED CHANGE ORDER FOR EMERGENCY
WORK AT THE TREATMENT PLANT (PRIMARY SEDIMENTATION TANK
REPAIRS)
On August 3, 2017, the Board of Directors declared an emergency and allowed the General Manager to
execute a change order with W.M. Lyles Co. based on the time necessary to complete the repairs on the
Primary Sedimentation Tanks (PST) prior to the wet weather season. The following repairs were
completed:
• Replaced floor rails and flights in PST No. 1;
• Replaced floor rails, chains, and flights in PST No. 2; and
• Replaced chains and flights in PST No. 3.
All work was completed by October 19, 2017. The estimated budget for the work was $800,000, which
included contractor costs, testing, staff time, and contingency. Attached is a presentation of the critical
work performed and the final change order and budget to date.
ATTACHMENTS:
1. Presentation
November 7, 2017 EOPS Regular Committee Meeting Agenda Packet - Page 21 of 28 [REVISED]
Page 2 of 5
10/31/17
UPDATE ON PRIMARY SEDIMENTATION
TANK REPAIRS - COMPLETED
Engineering & Operations Committee
November 7, 2017 Meeting
Presented by
Edgar J. Lopez, PE
,,,:_ — Capital Projects Division Manager
PRIMARY SEDIMENTATION TANK (PST) REPAIRS
Background:
• Three major rail failures have occurred in the past year:
• PST No. 4 failed August 2016
• PST No. 1 failed January 2017
• PST No. 1 failed May 2017
• All four PST's were inspected and staff concluded that major
repairs were needed
• Request for Proposals were sent to three Contractors that
were currently working on Central San Projects. Two Proposals
were received; W.M. Lyles Co. was selected
• Board authorized change order at the August 3, 2017 Meeting
1
November 7, 2017 EOPS Regular Committee Meeting Agenda Packet - Page 22 of 28 [REVISED]
Page 3 of 5
10/31/17
PRIMARY SEDIMENTATION TANK REPAIRS
Scope:
• Replacement of bottom rails with stainless steel rails in
PST Nos. 1 and 2 and replacement of chains and flights in
PST Nos. 2 and 3
Schedule:
Start Work in Tank 1
Complete Tank 1
Start Work in Tank 2
Complete Tank 2
Start Work in Tank 3
Complete Tank 3
September 7, 2017
September 20, 2017
September 26, 2016
October 17, 2016
October 23, 2016
October 31, 2016
September 7, 2017
September 22, 2017
September 26, 2017
October 12, 2017
October 16, 2017
October 19, 2017
2
November 7, 2017 EOPS Regular Committee Meeting Agenda Packet - Page 23 of 28 [REVISED]
Page 4 of 5
10/31/17
PRIMARY SEDIMENTATION TANK REPAIRS
Cost Summary:
• Budgeted Amount for Work $800,000
• Actual Contractor Cost $576,000
• Staff Time and Testing $16,000
Total Spent to Date $592,000
• Approximately $100,000 anticipated for electrical work and
flight monitor system; designed by staff
3
November 7, 2017 EOPS Regular Committee Meeting Agenda Packet - Page 24 of 28 [REVISED]
Page 5 of 5
10/31/17
QUESTIONS?
November 7, 2017 EOPS Regular Committee Meeting Agenda Packet - Page 25 of 28 [REVISED]