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City outlines $602,973 Forest Heights sewer repair and seeks $266,723 budget amendment
Summary
City staff detailed a three‑phase repair after a collapsed sewer main in the Forest Heights development — compaction grouting, underpinning homeowners' foundations, and excavation/repair — with total costs reported at $602,973 and a staff request to amend the 2026 budget for $266,723.34.
City staff presented a detailed timeline and cost breakdown of a project to repair a collapsed sewer main in the Forest Heights neighborhood at the July 14 Nixa City Council meeting.
Staff described the failure as occurring near a raveling erosion dome (a karst‑related feature). The collapse was discovered after a homeowner reported a backup; camera inspection confirmed the failure and staff instituted emergency purchasing and assessments. Because the line runs deep — the presenter said the excavation zone was about 17 feet deep between two existing homes — the city implemented a three‑phase remediation plan: Phase 1 compaction grouting to fill voids; Phase 2 underpinning of nearby home foundations; and Phase 3 excavation and mainline repair.
The staff presenter gave line‑item figures: Phase 1 (compaction grouting and engineering) $126,264.68; Phase 2 (underpinning) $148,614.50; Phase 3 (excavation, repair and restoration) $261,405.84; total project cost $602,973. Staff noted the numbers exclude all staff time and some coordination costs. The presenter also said 17 homes used the compromised line and five homes in the cul‑de‑sac lost service during the emergency bypass and repair operations.
Because some repair expenses were incurred in 2026, staff requested a budget amendment of $266,723.34 covering items expensed in 2026. Council opened and closed a public hearing on the amendment with no public comments recorded during the meeting.
The report referenced contractors and consultants engaged for the work — RIN Engineering (compaction grouting), Cochrane Engineering (geotechnical work and engineering coordination), Owen Engineering (soil testing), Raine/Renton Engineering (underpinning) and Hamilton & Dad (excavation and repair) — and documented the decision sequence that led to underpinning and excavation to protect adjacent foundations. Staff said restoration work continued into the following year and sod replacement completed June 4.
Council did not record a vote on the budget amendment during the meeting; staff said the item would return as a formal amendment for council action.
