HomeMy WebLinkAboutItem 3.c. Presentation (Handout)August 14, 2023
DOWNTOWN WALNUT
CREEK SEWER
RENOVATIONS - LOCUST
DISTRICT PROJECT
100049
Engineering and Operations
Committee Meeting
Sasha Mestetsky, P.E.
Senior Engineer
Project Background
and Drivers
Renovate approximately 4,400 feet of
small diameter sewers by open -trench
construction methods
Public sewers being maintained on a
monthly schedule since 2000's and
requires cleaning to be performed outside
of standard business hours
Project Coordination
City of Walnut Creek's Paving and
Infrastructure Improvements Project
East Bay Municipal Utility District's
Improvement Project
Detail
Area
4.
Item 3.c.
(Handout)
Attachment 4
3
s
Project Complexities
High -density commercial setting at the heart
of Downtown Walnut Creek along Locust
Street including cross streets
Existing sewers are flat, and have fats, oil,
and grease issues and structural defects
Highly congested utility corridor in the
street including sewer, gas, water, electric,
storm, telecommunication, etc.
Contract work is in a dense commercial area
with various restaurants and businesses
frontage to the project limits
Public outreach has been extensive,
targeted and was coordinated with other
utilities and city staff
Private Side Sewers (Laterals):
Sewe QNQO���o
Clean- I Public
buf Ri06fo/•Way No
Alternatives with Lower Lateral
1. Standard approach in Sewer Renovation Program
Replace connection and up to 6 feet transition
Advise property owners of condition of lateral when known and
encourage/educate/or coordinate replacement at owner's expense
2. Pending Lateral Financial Assistance Program with Standard approach.
3. Project specific approach to best resolve the issues (Recommended):
Reduce grease maintenance by Collection System Operations
Minimize future construction impacts and efforts for all
Offer the pending assistance program for the remaining lateral and other
private sewer facilities (grease trap improvements, interceptors, etc.)
Special Circumstances and Project Needs
Project proposes to replace the lower lateral as needed:
Lower laterals up to approximately 30 feet to edge of public right-of-
way
New public sewers will be installed deeper and adjustments on
laterals are needed. Lower laterals will be installed to code (6-inch for
commercial)
Several lateral connections are inactive and will be abandoned after
confirmation
Staff recommends to include the lower lateral replacement in the
public right-of-way to best design and remediate the sewer issues
3
Summary of Bids
Engineer's Estimate: $5,000,000
No.
BIDDER
BID PRICE
1
Pregsion Engineering, Inc.
$4,112,000
San Francisco, California
2
K.J. Wands Construction, Inc.
$4,138,000
South San Francisco, California
3
Ranger �pelines, Inc_
$4.777,480
San Francisco, California
4
JMB Construction, Inc.
$4.897.950
South San Francisco, California
Cratus, Inc.
$5.464.680
San Francisco, California
6
Basset Engineering
$5,631,414
San Francisco, California
7
GIcsage Engineering, Inc.
$6,437,632
Richmond, Cafiromia
8
Mitchell Engineering
$6,640,620
San Francisco, California
9
A&8 Construction, Inc.
$7.373,000
0aidand, California
Financial Impact of Additional Lower
Laterals
Approximately up to $300,000 and includes:
Additional lower lateral replacement
New clean outs at the end of the lower lateral
Inspection by Central San and contingency for conflicts
Bids received were highly competitive and below the
engineer's estimate of $500,000.
M
Total Estimated Project Cost
No.
Item Description
Amounts
of
Construction
Cost
1_
CONSTRUCTION
a_ Construction Contract
$4,112,000
L. 15%Contingency
$617,000
c Permits
$190,000
SUBTOTAL - CONSTRUCTION COST
$4,789,000
100 %
2_
CONSTRUCTION MANAGEMENT
a_ District Farces
-Construction Management (Engineering, Survey)
$220,000
- Public Relati onsfRi ght-of-Way
$70,000
-Lateral Inspection
$50,000
-Operations (CSO)
$25.000
It Consultants
-General Inspection
$200.000
-Material TestinglArboristfOthers
$60,000
SUBTOTAL- CONSTRUCTION MANAGEMENT
$625,000
13%
3.
PREBID EXPENDITURES
a_ Engineering (Design, Survey, Right -of -Way, Drafting)
$500 000
SUBTOTAL - PREBID EXPENDITURES
$500 000
10
4.
TOTAL E STIMATED PROJECT COST
$5,914,000
Recommended Board Action:
Staff recommends the following:
Find the project is exempt from the California Environmental
Quality Act;
Award a construction contract in the amount of $4,112,000 to
Precision Engineering, Inc., the lowest responsive and
responsible bidder, for the construction of Downtown Walnut
Creek Sewer Renovations — Locust, District Project 100049;
and
3. Authorize staff to replace additional lower lateral on the
Public right away to improve the public sewer system and
minimize maintenance.