---
title: 2628 — Mason Park BESS — Bid Prep
type: bid-prep
created: 2026-05-04
created_by: cowork-lfcs (lfcs-bid-prep-doc workflow)
---

# 2628 — Bid Prep · Mason Park BESS

## 1. RFQ summary

- **From:** Vaughan Civil (request for quote — Civil & Building TS 7311 Mason Park Annex BESS, NC-00965 Transmittal)
- **To:** LF Construction Services
- **For:** FRP works at Mason Park Grid, Homebush
- **Reference:** CCSP-00455 BESS Grid Mason Park Civil Works · NC-00996 · TW7310
- **Original quote-back date:** Wed 15 Apr 2026 (Husse note: "if you could return a quote for Wednesday April 15th it would be appreciated")
- **V1 quote issued:** 2026-04-19 by Liam (Husse-priced)
- **v-CW-rev1 issued:** 2026-05-04 (Cowork independent A/B)

## 2. Scope of works (verbatim from RFQ + BoQ + LFCS V1)

LFCS shall supply labour, plant and small consumables for the FRP package only. Vaughan shall supply all permanent materials.

**Construction works (LFCS scope):**

a. Cable Pits — 4× 600×600×600 cast in-situ reinforced concrete pits (per drwg 272731)

b. Transformer Bay Bund Slabs — 3 slabs:
   - AUX ETXa: 6 × 5.35 × 0.35 m bund floor slab (drwg 272731)
   - AUX ETXb: 6 × 5.30 × 0.35 m bund floor slab (drwg 272730)
   - TX Bund: 16.3 × 10.6 m bund floor slab, depth varies 150–750 mm (drwg 272732), stated total volume 93.35 m³

c. Reinforced Concrete Sumps — 4 sumps:
   - S1, S2: 900 × 900 × 750 deep
   - S3, S4: 450 × 450 × 300 deep

d. Transformer Bay Walls (low) — 8 walls (BW1, BW2, BW3, BW4, BW5, BW6, BW7, BW8) heights 0.45–0.55 m (drwg 272729/272734/272735)

e. Transformer Bay Walls (TALL) — CW1 + CW2 — both 17.9 lm × 0.25 thick × **5.9 m HIGH** (53.05 m³ combined)

f. Edge Beam EB1 — 20 lin m × 0.3 × 0.3

g. Concrete Plinths — A5 (3.1×2.1×0.5) + A6 (3.2×2.4×0.55)

h. Concrete Turrets — TT5, TT6 (1×0.6×0.6) + Turret 9 (0.75×0.75×0.5)

i. Switchyard Footings — 8 footings + 1 cable pit (drwg 272726/272738):
   - Earthing cabinet (2.4×1.9×0.5)
   - 33kV VT and busbar support A6 + A6A (2×1.5×0.6)
   - 33kV disconnector support A7 + A7A (2.6×1.8×0.5)
   - AC cabinet (1.7×1.15×1.2)
   - 33kV cable stand 1 + 2 (4×2.45×0.65)
   - Cable Pit (1.5×1.3×1.15 enclosed)

j. Concrete Roadway — per drwg 272731 — total stated 289 m³ at 200 mm thick (≈1,443 m²) — 25 panel breakdown for accurate volume

k. Concrete Kerb — K1-type 252 lin m + TX Roadway kerb 36 lin m (288 lin m total)

l. Retaining Walls — drwg 272737 — 7 sections totalling 76 lin m, varying heights 0.4–0.8 m, 0.3 thick

## 3. Programme

- **Hours:** Day shift only Monday–Friday 7:00am – 3:30pm (per Liam V1 quote basis — preserved)
- **Programme estimate:** ≈13 weeks total
- **Critical path:** CW1 + CW2 6-week tall-wall window (Acrow + EWP + Scaffold + Manitou plant period)
- **No night shift assumed.** No midnight crossing loading.
- **No public holiday work assumed.** Public holidays priced as variation.

## 4. Pricing summary

| Version | Date | By | Total ex GST | Total inc GST | Comment |
|---|---|---:|---:|---:|---|
| V1 | 2026-04-19 | Liam (Husse-priced) | $857,041.60 | $942,745.76 | 7-page PDF, 42 exclusions |
| **v-CW-rev1** | **2026-05-04** | **Cowork** | **$541,861.76** | **$596,050** | First-principles, Rate Card V1.7 day rates, +15% redundancy |

**Cowork delta:** −$315,180 (−36.8%) vs V1.

Posture choice for Rocky:
- **Submit V1 ($857K ex GST):** defensible-for-variations posture; high redundancy; Husse rates already reviewed; safe.
- **Submit v-CW-rev1 ($542K ex GST):** competitive-for-award posture; 37% under V1; first-principles defensible; risk = no fat for site surprises.
- **Hybrid (e.g. $700K):** average the two; lock margin between the two estimates.

## 5. Calc methodology — Cowork v-CW-rev1

- **Trade rate:** $85/hr (Rate Card V1.7 day shift first 8 hrs ordinary)
- **Supervisor rate:** $95/hr (LFCS standard +$10 over trade)
- **Materials:** at cost +10% markup (Rate Card V1.7 standard)
- **Redundancy:** +15% on subtotal (LFCS standard)
- **GST:** +10%
- **Productivity baselines (FRP Rates Development + industry):**
  - Slabs: 50–80 m²/crew-day (matches Liam V1 160 m²/day for crew of 3-4)
  - Tall walls (CW1/CW2): 12–15 m²/crew-day
  - Roadway: 200–240 m²/crew-day
  - Low walls: ~3 m³/crew-day
  - Footings: ~6 m³/crew-day
  - Pits/sumps/turrets: 0.5–1 crew-day per element

See `02b/2628-Rate-Buildup-2026-05-04_v-CW-rev1.xlsx` for line-by-line Labour + Materials + Plant build-up.

## 6. Risks + assumptions to confirm with Rocky

1. **CW1+CW2 plant burn rate** dominant — 6-wk allowance = ~$72K. Confirm program window is realistic.
2. **TX Bund stepped pour** — confirm if single 93m³ pour or 4-lift sequence (drives productivity 30%+).
3. **Reo density assumption** — for HV electrical containment, reo can run 200-300 kg/m³. If higher, +10% labour on tall walls.
4. **Roadway productivity** — 240 m²/day assumed. If reduced for fiddly switchyard pavement, +$11K.
5. **Stairs around retaining wall (×4)** NOT IN BoQ — confirm with Vaughan if added.
6. **Connolly Joint type and locations** TBC.
7. **Day-shift programme** — confirm no night/weekend work allowed.

## 7. Next steps

1. **Rocky review** — pick submission posture (V1, v-CW-rev1, or hybrid).
2. **Pre-Pricing-Grill** — see `02b/Pre-Pricing-Grill-2026-05-04.md` — answers carried from V1 quote inferences; Rocky to confirm.
3. **Pre-call questions** — see `06c/Pre-Call-Questions-2026-05-04.md` — surface to Vaughan if QS call scheduled.
4. **Drawing vision-pass** — `lfcs-drawing-extract-vision` to validate quantities + flag discrepancies.
5. **Spec summarise** — AusGrid Vibration spec + Asbestos Register + SER via `lfcs-spec-summarise`.
6. **Drive upload + Airtable sync** — once Rocky locks the submission posture.