Material change

Addendum 3 — work window

MTA Construction & Development · E31634 · issued 13:41 ET · detected 13:46:22 ET

Was — as estimatedUnoccupied plant area. Continuous work window, straight time.

Now — addendum 3Occupied building. After-hours only, 16:00–23:00, with restricted access and staging.

Bid date: 11 Aug 2026 — unchanged

Addenda: 2 → 3

4 lines stale, 2 not carried at all — each depended on the unoccupied, continuous-window assumption.

Labor — extended$2,114,561
Rested on · Straight time. The 1.1× labor-to-material ratio assumes ordinary shift work.
Revised: withheld — Re-pricing needs a shift-differential wage basis, and no prevailing wage rate is sourced — comptroller.nyc.gov returned 403 on 29 Jul. A number here would be invented.
Crew productivityfolded into the labor ratio
Rested on · Open building with unrestricted access and staging. The elevated ratio already carries below-grade and live-plant conditions — it does not carry occupied-building access restriction on top of them.
Revised: withheld — Re-pricing needs a shift-differential wage basis, and no prevailing wage rate is sourced — comptroller.nyc.gov returned 403 on 29 Jul. A number here would be invented.
Schedule durationnot separately carried in a Class 5 ROM
Rested on · Continuous work window. Nightly 16:00–23:00 windows extend calendar duration against a fixed 1,947-day contract term.
Revised: withheld — Duration re-planning is a scheduling exercise, not an estimate line, and it precedes any cost figure.
General conditions — supervision hours6–10% range, unapplied
Rested on · Supervision tracks the original schedule. General conditions are carried as a 6–10% range and are not applied by the packet.
Revised: withheld — General conditions are yours to set; the packet stops at cost subtotal.
Protection and containmentnot carried
Rested on · None required — the area was unoccupied. Occupied-building dust and noise control was never priced because it was never needed.
Revised: withheld — This line does not exist yet. It must be created and priced, and no basis for it is in the workbook.
Temporary services — after-hoursnot carried
Rested on · None required. After-hours lighting, security escort and elevator operator do not arise in an unoccupied continuous window.
Revised: withheld — This line does not exist yet. It must be created and priced, and no basis for it is in the workbook.

Frozen: labor basis, schedule assumptions.

Nothing downstream of these assumptions advances until a named human releases them. Any approval already given on this packet is void, not merely stale.

Classified material because

Basis change. Does it change an assumption the estimate rests on — work window, access, occupancy, phasing, or the labor basis?
Scope change. Does it add, remove, or re-draw work — quantities, equipment, or systems?

Detection: Published addendum count moved 2 → 3 on the agency’s own index. Deterministic delta, no model involved.
Substance: Supplied for rehearsal — not retrieved from the addendum document
index sha e335153d0b60a0ad… · fired in run_202608031757_codl at 06:15 PM · materiality rubric: provisional — not validated by a qualified estimator

Representative — not a real postingDetection mechanism live; the change itself is a rehearsal scenario, not a retrieved addendum.