Item 14 - Lincoln Avenue Water and Sewer Main Improvements

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Public Works Agency www.santa-ana.org/public-works Item # 14 City of Santa Ana 20 Civic Center Plaza, Santa Ana, CA 92701 Staff Report March 21, 2023 TOPIC: Lincoln Avenue Water and Sewer Main Improvements AGENDA TITLE Approve an Amendment to the Project Cost Analysis to Add $343,000 to an Existing Construction Contract with Big Ben, Inc. for a Revised Estimated Project Delivery Cost of $2,343,000, for the Lincoln Avenue Water and Sewer Main Improvements Project (Project Nos. 22-6468 and 22-6620) (Non-General Fund) RECOMMENDED ACTION Approve an amendment to the Project Cost Analysis to reflect the new amount of $571,235 for project contingency for unanticipated or unforeseen work, for a total construction delivery cost of $2,343,000, subject to non-substantive changes approved by the City Manager and City Attorney. DISCUSSION On April 19, 2022, the City Council authorized the award of a construction contract to Big Ben, Inc. to construct new Water, Sewer, and Street Improvements (Exhibit 1). During construction, unforeseen obstructions were found underground that required removal to continue with the underground water and sewer improvements. The project is located next to a railroad track where miscellaneous concrete slab, rebar, and box culvert were buried under Lincoln Avenue and were in the way of the new water and sewer line alignment and street improvement. As a result of the extensive excavations caused by the unforeseen obstructions, the National Pollutant Discharge Elimination System (NPDES) regulations were triggered, requiring the project to add a stormwater treatment unit “filterra” to treat the water runoff into the City storm drain. Approval of the recommended action will allow completion of the project including change orders and additional required work. The recommended action will increase the contract project contingency by $343,000, thereby increasing the total estimated construction delivery cost to $2,343,000, as summarized in the table below: Project Item Current Total New Total Construction Contract $1,453,765 $1,453,765 Construction, Administration, Inspection, Testing $218,000 $218,000 Contingencies $228,235 $571,235 Water Engineering $100,000 $100,000 TOTAL CONSTRUCTION DELIVERY COST $2,000,000 $2,343,000