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Staff outlines $228,000 change order for Chester public works building tied to subsurface finds
Summary
City staff reported a not-to-exceed $228,000 change order for the public works building to remove an underground storage tank, contaminated soil, a deep concrete slab and unsuitable soils; staff said contingency funds will cover the cost and the project remains on track for mid-November completion.
City staff presented change order No. 4 for the Chester public works building on June 22, citing unexpected subsurface conditions that have increased costs by about $228,000.
Staff said crews uncovered an underground storage tank and contaminated soil, together costing roughly $88,000 to remove and dispose of. Excavation revealed a deep subgrade concrete slab beneath the planned salt shed location that required removal (about $21,000). Staff described additional unsuitable soils that could not be compacted or reused; they estimated a not-to-exceed $120,000 to remove and replace those soils. Taken together, staff framed the total change order at approximately $228,000 and said the work will be paid from the project's contingency line.
Project staff told the council they still expect to complete the building by mid-November and that this change order reflects subsurface conditions typical of brownfield sites. The transcript does not include a public roll-call vote; staff indicated the contingency budget will cover the work and anticipated this would be the bulk of remaining subsurface change orders.
