HomeMy WebLinkAbout04. Design of Headworks Screen Upgrade and Sub 16 Switchgear Replacement, DPs 7324 & 7327Central Contra Costa Sanitary District 4%
' BOARD OF DIRECTORS
POSITION PAPER DRAFT
Board Meeting Date: October 15, 2015
Subject: AUTHORIZE THE GENERAL MANAGER TO EXECUTE AN AGREEMENT
WITH BROWN AND CALDWELL FOR PROFESSIONAL ENGINEERING
DESIGN SERVICES FOR THE HEADWORKS SCREENING UPGRADE
AND SUB 16 SWITCHGEAR REPLACEMENT, DISTRICT PROJECTS
7324 AND 7327
Submitted By:
Brad Leidecker, Associate Engineer
Initiating Dept. /Div.:
Engineering and Technical Services
Capital Projects
REVIEWED AND RECOMMENDED FOR BOARD ACTION:
C. Mizutani - Senior Engineer
E. Lopez — Capital Projects Division Manager
JM. Petit — Director of Engineering and Technical
Services
Roger S. Bailey
General Manager
ISSUE: Board of Directors' authorization is required for the General Manager to
execute a professional engineering services agreement in an amount greater than
$100,000.
BACKGROUND: The Capital Improvement Budget (CIB) Priority Ranking is Critical
and the project aligns with the District's Strategic Plan, specifically Goal No. 6, which is
"Maintain a Reliable Wastewater Infrastructure."
The existing Headworks screens were installed in 1993. The original design was
modified and the screenings handling facilities were eliminated as a result of a value
engineering study performed after the project was initially bid. Instead, the screens were
installed with grinders, which grind and reintroduce the screenings just downstream of
the screens. The ground screenings are dewatered in the centrifuges or processed
through the scum thickener and ultimately combusted in the incinerators.
The existing Headworks Sub 16 Switchgear was installed under the same project as the
Headworks and influent pump station. The existing ABB switchgear had a short
production run, is obsolete, and replacement parts are difficult to source. Recent issues
with the circuit breakers have revealed that they will only become more difficult to
service. In a report by CDM in 2011, it was recommended to replace the switchgear in
its entirety to assure reliable service from the influent pumps for the treatment plant.
This project will significantly improve the following challenges:
Grinding of the screenings has resulted in several negative impacts, such as
increased plastics and floatables in the liquid and solid streams, equipment
fouling and potential contribution to high HCL incineration emissions.
Page 1 of 3
POSITION PAPER
Board Meeting Date: October 15, 2015
suaiect: AUTHORIZE THE GENERAL MANAGER TO EXECUTE AN AGREEMENT
WITH BROWN AND CALDWELL FOR PROFESSIONAL ENGINEERING
DESIGN SERVICES FOR THE HEADWORKS SCREENING UPGRADE
AND SUB 16 SWITCHGEAR REPLACEMENT, DISTRICT PROJECTS 7324
AND 7327
• The existing screens are not enclosed and newer technology will help reduce
odor issues.
• Maintaining and sourcing replacement parts for the existing screens, grinders
and switchgear is difficult and expensive.
• The reliability of the existing switchgear is a significant risk to the operation of the
Headworks and influent pump station.
The Headworks screening upgrade portion of the project will investigate the current
Headworks screening operation and recommend the most strategic and cost effective
improvements. Following this phase, the project will include design and construction of
improvements to implement the recommendation.
The switchgear portion of the project will replace the Sub 16 electrical switchgear
feeding the Headworks. Work includes removal of the existing switchgear and
modifications of the building and support facilities as necessary for the installation.
Staff is in the process of standardizing the plans and specifications for projects
designed internally and externally. Many of the existing specifications are outdated and
contain references to past standards that are no longer applicable. This portion of the
project will develop standard specifications, details and computer aided design (CAD)
standards.
District staff issued a request for proposals to the engineering consulting community
and received two proposals (HDR and Brown and Caldwell). Staff evaluated the
proposals and interviewed the consultant teams. Brown and Caldwell had the highest
total score and is considered the best overall fit for the project.
Staff has negotiated an agreement with Brown and Caldwell in an amount not to exceed
$900,000 for the preliminary and final design phases of the project.
ALTERNATIVES /CONSIDERATIONS: Do not authorize the General Manger to
execute the agreement, which is not recommended since it would limit staff's ability to
implement the projects.
FINANCIAL IMPACTS: The Brown and Caldwell agreement is anticipated to be
$900,000. The total estimated cost for project design is $1,500,000, which includes
planning, consultant costs, District staff time, and bidding. This project is included in the
Fiscal Year 2015 -16 Capital Improvement Budget on pages TP -20 and 21 with a total
Page 2 of 3
POSITION PAPER
Board Meeting Date: October 15, 2015
subject: AUTHORIZE THE GENERAL MANAGER TO EXECUTE AN AGREEMENT
WITH BROWN AND CALDWELL FOR PROFESSIONAL ENGINEERING
DESIGN SERVICES FOR THE HEADWORKS SCREENING UPGRADE
AND SUB 16 SWITCHGEAR REPLACEMENT, DISTRICT PROJECTS 7324
AND 7327
estimated project budget of $9,000,000. Staff has conducted a budget analysis of the
Treatment Plant Program budget and concluded that adequate funds are available.
COMMITTEE RECOMMENDATION: The Engineering and Operations Committee
reviewed this project at the meeting on October 7, 2015, and recommended ....
RECOMMENDED BOARD ACTION: Authorize the General Manager to execute a
Professional Engineering Services Agreement with Brown and Caldwell with a cost
ceiling of $900,000 for the preliminary and final design of the Headworks Screening
Upgrade and Sub 16 Switchgear Replacement, DPs 7234 and 7327.
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