Incoming Change Order Request — CO-047
Unforeseen subsurface conditions encountered during excavation at Metro Station B foundation zone. Upon reaching design subgrade elevation at -22 ft. below grade, contractor encountered existing buried concrete cap (estimated 6" thickness, continuous along 180 LF of station footprint). Buried cap was not shown on contract drawings or geotechnical report and required removal and replacement with new 6" reinforced concrete cap per structural engineer's field direction. Contractor requests $284,000 additional compensation and 14-calendar-day schedule extension to critical path activity ST-04 (Structural Foundation).
Estimated claim exposure avoided through AI-guided negotiation
Negotiated target: $200,000 vs. $284,000 requestedAI Risk Assessment
- DSC claim has legal merit — buried cap not in geotech report
- Cost markup (32%) appears inflated vs. industry norms (15–18%)
- 14-day extension likely overstated; actual critical path impact: est. 5–7 days
- No third-party cost estimate submitted with claim
Recommended Response
- Accept the DSC basis — buried conditions are legitimate differing site conditions under the contract's DSC clause (GC-6.04)
- Challenge the cost markup — request detailed cost breakdown; dispute 32% markup, counter with 15%
- Reject 14-day extension — commission independent CPM schedule analysis; counter with 6 days based on concurrent activity review
- Target settlement: $200,000 and 6-day schedule extension
- Require substantiation — subcontractor invoices, equipment time sheets, labor records
Formal CO Response Letter
Full letter generated below — scroll down to view the AI-drafted formal response.
✗ $84K cost reduction requested
✗ 8-day schedule reduction contested
✓ Substantiation required within 15 days