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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.