TO: Napa-Vallejo Waste Management Authority Board of Directors
FROM: Chris Celsi, Executive Director
REPORT BY: Chris Celsi, Executive Director
SUBJECT: Change Orders and Budget Amendment for the American Canyon Sanitary Landfill Leachate Line Improvement Project
RECOMMENDATION
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1. Approval and authorization for Executive Director to execute two change orders totaling $55,720.40 with Benchmark Civil Construction, Inc. for the ACSL Leachate Line Improvement project, for a new contract total of $336,200.82.
2. Approval and authorization to amend and increase the Capital Project Budget Item 25801 - ACSL Leachate Line Improvement from $300,000 to $370,000.
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EXECUTIVE SUMMARY
On October 10, 2024, the Board authorized award of a contract to Benchmark Civil Construction for the American Canyon Sanitary Landfill (ACSL) Leachate Line Improvement Project in the amount of $280,480.42. The leachate lines collect fluids draining from the ACSL and carry the fluids to the wastewater system for treatment. The Project involved installation of a leachate line cleanouts, pressure testing, concrete curb and gutter replacement, concrete sidewalk replacement, moisture compaction of subgrade, and asphalt pavement replacement. Most of the work occurred in the public right-of-way of the City of American Canyon.
During construction Benchmark discovered that portions of the leachate line system were not in the locations where they were supposed to be, and/or much deeper than expected. Benchmark incurred additional labor and material costs in locating the leachate lines, avoiding other utilities, dewatering some trenches during construction, and bringing in additional base rock to protect the leachate lines. Benchmark also incurred additional labor and equipment costs locating and clearing a blockage in the leachate lines. The additional work is further described in two change orders included with this item, totaling $55,720.40 which the Executive Director is requesting permi...
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