HomeMy WebLinkAbout07. Amendment to Professional Engineering Services Agreement with Carollo Engineers, Inc. for A-Linie Sewer Relocation DP 100050Page 1 of 4
Item 7.
DCENTRALSAN
MEETING DATE: JULY25, 2024
BOARD OF DIRECTORS
POSITION PAPER
SUBJECT: AUTHORIZE THE GENERAL MANAGER TO EXECUTE AN AMENDMENT TO
THE PROFESSIONAL ENGINEERING SERVICES AGREEMENT WITH
CAROLLO ENGI NEERS, I NC. I N THE AMOUNT OF $780,000 FOR AN
AMENDED AMOUNT NOT TO EXCEED $1,880,000 FOR DESIGN OF THE A-
LINE SEWER RELOCATION FOR CONTRA COSTA TRANSPORTATION
AUTHORITY (CCTA), DISTRICT PROJECT 100050
SUBMITTED BY: INITIATING DEPARTMENT:
DANA LAWSON, SENIOR ENGINEER ENG-PDS-DIVISION MANAGER
REVIEWED BY: DANEA GEMMELL, PLANNING AND DEVELOPMENT SERVICES DIVISION
MANAGER
GREG NORBY, DEPUTY GM - ENGINEERING & OPERATIONS
Roger S. Bailey Leah Castella
General Manager District Counsel
ISSUE
The Board of Directors' (Board) authorization is required for the General Manager to execute amendments
to professional engineering services agreements in an amount greater than $100,000 for agreements with
an original amount less than $2,000,000, in compliance with Board Policy 37, item 9b.
BACKGROUND
On September 7, 2023, the Board authorized the General Manager to execute a professional engineering
services agreement in an amount not to exceed $1,100,000 as related to District Project (DP) 100050, A -
Line Sewer Relocation for CCTA. This effort is required by CCTA to accommodate their final phase of the
improvements to the State Route 4/ Interstate 680 interchange and will be reimbursed by CCTA, as
July 25, 2024 Special Board Meeting Agenda Packet - Page 32 of 188
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required by California Streets and Highway Code Section 702. Utility Agreement No. 633 between CCTA
and Central San was executed on May 17, 2023 with an estimated reimbursement amount of $1,907,032.
This amendment to the professional engineering agreement with Carollo Engineers will extend the design
of the relocation to the Treatment Plant's Influent Structure to obtain adequate clearance under Grayson
Creek where the low -flow channel (LF) has eroded below the flood control channel's design in 1960.
When the A -Line Relief Interceptor was installed in the early 1990s, it had to clear the eroded low -flow
channel which required lowering the invert elevation of the headworks intake. The relocation of the A -Line
will take advantage of this lower invert. This will extend the length of relocation/replacement from 2,000 LF
to approximately 3,500 LF and ensure that Central San is ensure that the system remains self flushing
under gravity flows.
After an initial investigation to verify this concept, Carollo Engineers prepared a scope and budget revision
which would increase the total agreement amount from $1,100,000 to $1,880,000. While this revised
consulting budget is within the Utility Agreement amount, there will also be internal staff time for project
management and coordination, so CCTA anticipates taking an amendment to their board in September or
October.
California Environmental Quality Act (CEQA)
At its meeting on June 15, 2023, the Board found this project to be exempt from CEQA.
ALTERNATIVES/CONSIDERATIONS
The Board may decline authorization of the amendment. This is not recommended as the amendment is
necessary to provide a comprehensive design to ensure the relocation provides comparable operation;
meaning, the relocation has to extend from the upper reach on Berry Drive all the way to the Treatment
Plant's Influent Structure to obtain adequate clearance under Grayson Creek to ensure that the system
remains self flushing under gravity flows.
FINANCIAL IMPACTS
While this project is included in the FY 2024-25 Budget on page 244, there will be no net impact to the
Capital I mprovement Budget (Cl B) or 10-Year Capital I mprovement Plan (CI P) since the costs will be
reimbursed by CCTA as outlined in the Utility Relocation Agreement.
COMMITTEE RECOMMENDATION
The Engineering and Operations Committee reviewed this matter at the July 15, 2024 Committee Meeting
and recommended approval.
RECOMMENDED BOARD ACTION
Authorize the General Manager to execute an amendment to the professional engineering services
agreement with Carollo Engineers, I nc. in the amount of $780,000 for an amended amount not to exceed
$1,880,000 for design of the A -Line Sewer Relocation for CCTA, District Project 100050.
Strategic Plan re -In
GOAL ONE: Customer and Community
Strategy 3 - Build neighborhood and industry relations
July 25, 2024 Special Board Meeting Agenda Packet - Page 33 of 188
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GOAL FOUR: Governance and Fiscal Responsibility
Strategy 3 - Maintain financial stability and sustainability
GOAL SIX. Infrastructure Reliability
Strategy 1 - Manage assets optimally
ATTACHMENTS:
1. Map
July 25, 2024 Special Board Meeting Agenda Packet - Page 34 of 188
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