# 07 — Assumption Ledger (LIVING DOC)

Every assumption made during proposal development. Each row has rationale, impact if wrong, and the gap it covers.

When customer answers a Q-NNN, find every A-NNN that referenced that gap and reconfirm/adjust.

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## Phase 7 Consolidation Summary (as of 2026-04-28)

| Status | Count |
|--------|------:|
| **Open** (active during proposal) | 19 |
| **Retired** (rehab-specific, dropped after greenfield re-classification) | 4 |
| **TOTAL tracked** | 23 |

### High-impact-if-wrong assumptions (±10% cost/schedule or more)

These need explicit customer confirmation in proposal acceptance — flagged with **[HIGH-IMPACT]** below:

- **A-009** — 16-week project schedule (Q-007 dependent — schedule pressure could add 20–30% labor)
- **A-CHW-001** — 4 PCHWP (3W+1S) — wrong count cascades into pump/cable/manhour
- **A-CHW-002** — 3 cooling towers — same
- **A-PL-001** — Plumbing pump LZ DI / HZ HLI split — affects panel I/O module sizing
- **A-VENT-001** — 3-DI per fan — TUEC totals diverge by 23 DI; could indicate scope misread
- **A-EE-001** — 13 power meters per A-004 — Q-011 dependent
- **A-006-rebuilt-if-retrofit** — if Q-018 reveals retrofit, demolition/cutover could add 30%

### Phase 7 dispositions

- **No assumptions retired in this pass** (all rehab-specific assumptions were already retired during Phase 2 stage re-classification)
- **All Open assumptions remain Open** — pending customer answers to Q-001 through Q-021
- **Any new generator-implicit assumptions captured?** Yes — A-NET-001..005 (network architecture defaults from A5) and pricing defaults from `_playbook/checklists/standard-pricing-defaults.yaml` are documented in their respective working docs but not duplicated here

### Top 5 assumptions for proposal "Stated Assumptions" section (Phase 10)

The proposal team should highlight these to the customer (per importance + likelihood of disagreement):

1. **A-009** — 16-week schedule from PO to handover
2. **A-008** — Commercial terms (30-day net, 10% retention, 1+1 yr warranty, no LD, PHP)
3. **A-007 + A-NET-003** — Isolated BMS LAN, flat /24, single uplink to customer LAN; no integration with PMS/FDAS/CCTV/ACS unless added (Q-012)
4. **A-013** — 16 hours operator training included; admin/factory training as priced options
5. **A-014** — 1-year preventive maintenance NOT in base; available as priced option

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## Format

| ID | Assumption | Rationale | Impact if wrong | Gap covered | Status |
|----|-----------|-----------|------------------|-------------|--------|

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## Active assumptions

| ID | Assumption | Rationale | Impact if wrong | Gap | Status |
|----|-----------|-----------|------------------|-----|--------|
| A-001 | Cable run lengths use a 30 m average panel-to-device run + 80 m trunk per floor as a fallback for cable routes not covered by the available drawings. **Scope of fallback (Kingsford-specific):** the proposal-stage information includes the EE Plan (Construction Bulletin No.8 — partial architectural backgrounds, panel locations, riser diagram EE-24) and the BMS Points list with zone-coded sheets BMS-01/02/04 covering Basement-Podium BOH. Trunk cables between panels, inter-floor riser cables, and plant-room cable runs in the Basement-Podium BOH zones are *measurable* from these inputs and should not use A-001. Guestroom-corridor FCU/VAV runs and tenant fit-out spaces *are* A-001 fallback because no HVAC / full-architectural set has been provided for those areas. **Pilot-run note (2026-04-27):** the pilot run applied A-001 to every cable rather than measuring the measurable subset from the EE Plan; this is a process gap, not the system design — see `_playbook/sub-routines/measure-cable-routes.md`. Re-measurement of trunk + plant-room cables from the EE Plan is a Phase-5a follow-up before the proposal is issued. | Partial drawing coverage; agent skipped drawing-based measurement in initial pass | ±15% on cable, conduit, and wireman-hours for the fallback subset; measured rows have ±5–10% as-installed deviation | G-003 (HVAC), G-001 (full architectural set) | **Action: re-measure from EE Plan before issue** |
| A-002 | Plumbing equipment locations follow MC Standards typical condotel layout; calorifier rooms = 2 (lower ground + roof deck) per points list | No plumbing layouts; points list confirms quantities | Minor — points list gives equipment count | G-101 | Open |
| A-003 | Electrical baseline single-line follows MC Standards condotel template; only the explicitly revised sheets (per Construction Bulletin No.8) deviate | Only revisions provided; full baseline absent | Affects power metering point identification — ±5% | G-102 | Open |
| A-004 | Power metering hierarchy = main switchgear + each significant feeder (per Megaworld standard practice); estimate 1 meter per main + 1 per major load center | No full riser; revised EE-24 only Part 1 of 2 visible | ±10% on power meter count and Modbus interface effort | G-102 | Open |
| A-005 | Load schedule structure = 1 EE-21/22/23 page per major panel group; total panel-mounted instrument count derived from BMS Points list "C/O" column showing C/O = "BMS Contractor" | EE-21/22/23 provided as revisions; BMS PL gives definitive panel-mounted device count | Minor | G-102 | Open |
| A-007 | Network: dedicated BMS LAN (Cat6 trunk, managed Layer 2 switches) with single 1G uplink to customer corporate LAN at server room; no integration with hotel PMS, FLS, CCTV, ACS in base scope | No IT requirements stated; safe default | Affects switch count, network engineering hours, integration scope | G-103 | Open |
| A-008 | Commercial terms: 30-day net payment; 10% retention released at handover; 1-year manufacturer warranty + 1-year on-site defect liability; no LD; PHP-denominated | No terms stated; standard local market | Affects cash-flow & risk pricing — ±2% | G-104 | Open |
| A-009 | Schedule: 16-week project duration from PO to handover (4 weeks engineering, 4 weeks supply, 6 weeks installation, 2 weeks T&C). Comfortable schedule, normal manpower loading. | No customer schedule given | If actual is 8 weeks, requires double crew + overtime → +20-30% labor | G-004 | Open — **high-priority gap** |
| A-010-rev | **Working hours (greenfield):** standard daytime construction hours (8am–5pm Mon–Sat); no night-work premium; weekend work as needed for critical-path catch-up | New-construction site, no operating-building constraints | Minor (compared to retrofit assumption) | G-105 | Open |
| A-011-rev | **MEP sequencing (greenfield):** BMS installation follows main MEP trades — first-fix conduit/cable trays after structure, second-fix wiring after MEP rough-in, terminations & devices after MEP equipment delivery, T&C after MEP commissioning. Standard critical path. | Standard greenfield sequencing | Affects mobilization timing, not total cost | G-105 | Open |
| A-013 | Training: 16 hours of operator training on-site after handover, included in base | Standard for hotel BMS handover | Minor | G-107 | Open |
| A-014 | Maintenance: NOT included in base. Optional 1-year preventive maintenance contract priced separately | Customer did not request | Removes maintenance from base scope; customer can add later | G-108 | Open |
| A-015 | Contracting entity = **Megaworld Corporation** | Reviewed-by stamp + recipient on EE bulletin | If wrong, affects contract counterparty / billing entity | G-005 | Open |
| A-CHW-001 | Primary CHW Pump (PCHWP) quantity = **4** (3 working + 1 standby) | TUEC BMS-01 doesn't enumerate count; MC Standards mentions "Primary Chilled Water Pumps"; standard practice is N+1 redundancy matching N chillers | ±5 rows in A1; affects pump VFD count + cable runs | G-001 / G-003 — refine after Q-005/Q-008/Q-011 | Open |
| A-CHW-002 | Cooling Tower quantity = **3** (CT-1, CT-2, CT-3) — typical N=N relationship to chillers | BMS-02 r1c2 cooling tower table shows qty 3 column structure; matches 3 chillers + 3 condenser water pumps | ±9 rows per CT in A1 | G-001 / G-003 — refine after Q-005/Q-008 | Open |
| A-PL-001 | Plumbing pump status routing: **Lower-Ground (LZ) pumps via hardwired DI** to BMS panel; **Roofdeck (HZ) pumps via equipment-panel HLI gateway** to BMS | TUEC visible PL totals show 18 DI + 18 HLI for 36 pump status points (12 pumps × 3 status types). MC Standards lists all as "Auxiliary Contact" but physical wiring strategy varies by location. LZ-DI/HZ-HLI split matches TUEC totals exactly. | If wrong (e.g., all hardwired DI per MC Standards baseline), 18 HLI rows shift to DI, affecting panel I/O module sizing for PNL-PL-HZ. Same total point count. | G-101 — refine after Q-008 (mech layouts) confirms wiring strategy | Open |
| A-VENT-001 | All exhaust fans use 3-DI point pattern (Motor Status + Hand/Off/Auto + Trip Alarm), per MC Standards EAS baseline | MC Standards EAS baseline lists all 3 statuses for every fan. TUEC visible total is 181 DI for ventilation section. With 68 fans × 3 = 204 expected. | 23-DI discrepancy from TUEC suggests ~7-8 smaller fans (basement mech rooms, roofdeck) may have 2-DI pattern (no HOA) or some fans are missing in the points list. ±23 rows in A1 (±2-3% of total). | G-001 / G-003 — refine after Q-008 (mech layouts) confirms per-fan point pattern | Open |
| A-EE-001 | Power metering scope = **13 multifunction power meters** (3 main + 10 sub-feeder), each via Modbus with 5 HLI sub-points (kW, kWh, kVAR, V_avg, I_avg) + 1 Network connection | A-004 says "1 meter per main + per significant feeder"; common practice for medium hotel BMS scope. Sub-feeder coverage: chiller plant, AHU plant, kitchen, lighting, hotwater plant, lifts, BMS UPS, mechanical/pumps, boiler/laundry, fire pump. | If actual count is 5–20 meters, ±5 rows per meter (×6 = ±30-90 rows). Driver: customer's energy-monitoring expectations. | G-102 — refine after Q-011 (full electrical drawing set) and Q-013 (brand preferences) | Open |

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## Retired assumptions (rehab-specific, removed after stage re-classification 2026-04-27)

These were dropped when project was re-classified from rehabilitation to greenfield. **If Q-018 reveals the project is actually a retrofit, restore these.**

| ID | Was | Reason retired |
|----|-----|----------------|
| A-006 | "Full replacement of head-end + controllers + field devices + cabling; reuse trunk only on survey" | No existing system to replace — greenfield |
| A-010 (orig) | "Working hours: BOH plant rooms daytime; guestroom floors night-work 10pm–6am at 1.5×" | No operating-building constraint — greenfield |
| A-011 (orig) | "Phased zone-by-zone cutover; no system-wide outage" | No existing system to cut over — greenfield |
| A-012 | "Replace 100% field cabling; reuse main cable trays / conduit / penetrations where survey confirms" | No existing cabling — greenfield, all new install |