Variation Summary - Survey & DE Scope

$
Total Variation Claimed
$134,357
2 variations submitted
$
VS-SRV-001: Monitoring
$93,926
280% over tender
$
VS-SRV-002: Survey/Setout
$40,430
Proportional scope increase
#
Contract Items Affected
2
5.1-1A.7.2 & 5.1.1A.7.1
VS-SRV-001
Additional Monitoring Scope
$93,926.38
Contract Item: 5.1-1A.7.2
Subcontractor: Metric Survey Ltd
Tender: $33,570 | Actual: $127,496
SUBMITTED FOR REVIEW
VS-SRV-002
Additional Survey & Setout Scope
$40,430.25
Contract Item: 5.1.1A.7.1
Subcontractor: RF Sons Engineering Ltd
Ref: EW-11A (Piling +26%), EW-31 (Temp Works +143%)
SUBMITTED FOR REVIEW
Tender vs Actual Comparison
Variation Breakdown
Variation Summary Table $134,356.63
Variation Contract Item Description Tender Actual Variance Status
VS-SRV-001 5.1-1A.7.2 Additional Monitoring Scope (Metric Survey) $33,570.00 $127,496.38 $93,926.38 Submitted
VS-SRV-002 5.1.1A.7.1 Proportional Survey Scope Increase (RF Sons) $47,565.00 $87,995.25 $40,430.25 Submitted
TOTAL VARIATIONS $81,135.00 $215,491.63 $134,356.63

VS-SRV-002: Proportional increase based on EW-11A (Piling +26%) and EW-31 (Temporary Retention +143%) - Blended multiplier 1.85x

VS-SRV-001: Additional Monitoring Scope

$
Variation Amount
$93,926
Over tender allowance
$
Tender Allowance
$33,570
Item 5.1-1A.7.2
$
Actual + Forecast
$127,496
Metric Survey total
%
Over Budget
280%
3.8x tender estimate
Cost Breakdown - Monitoring Activities $127,496.38
Category Description Amount %
Monitoring - Daily Track, platform, sleeper monitoring, reporting $104,259.75 82%
Monitoring - Setup Installation of brackets, magnets, baseline observations $16,387.50 13%
Materials Magnets, L brackets, stickers, glue $6,849.13 5%
ACTUAL COST TO DATE $127,496.38
0%
0%
0%
TOTAL COST (Actual + Forecast) $127,496.38 100%
Less: Tender Allowance ($33,570.00)
VARIATION CLAIMED $93,926.38
Justification Summary
  • Extended Monitoring Frequency: Daily monitoring required during piling operations (vs periodic)
  • Additional Monitoring Points: Platform edges, sleeper monitoring, OLE structures, adjacent infrastructure
  • Night/Weekend Access: BOL access work at $200/hr premium rate (183+ night hours in Christmas period alone)
  • Setup & Reinstallation: Multiple reinstallation of monitoring points due to construction activities
  • Materials: 390+ magnets, brackets, 545+ stickers, adhesives for monitoring system

VS-SRV-002: Additional Survey & Setout Scope

$
Variation Amount
$40,430
Proportional scope increase
%
Piling Increase (EW-11A)
+26%
102 to 129 piles
%
Temp Works Increase (EW-31)
+143%
$661K to $1.6M
x
Blended Multiplier
1.85x
Applied to tender
Proportional Calculation - Survey & Setout Scope $40,430.25
Component Reference RFT Basis Actual/IFC Increase
Piling Works EW-11A 102 piles 129 piles +26%
Temporary Retention EW-31 $660,584 $1,603,118 +143%
Calculation Factor Amount
Original Tender Allowance (Item 5.1.1A.7.1) 1.00 $47,565.00
Piling Multiplier (50% weighting) 1.26 -
Temp Works Multiplier (50% weighting) 2.43 -
Blended Multiplier 1.85 -
Adjusted Survey Budget $47,565 x 1.85 $87,995.25
Less: Original Tender Allowance ($47,565.00)
VARIATION CLAIMED $40,430.25

📊 Actual Cost Tracking To Date (with Forecast)

This section tracks actual survey and setout costs incurred. Use the forecast fields to estimate remaining costs.

Metric Survey - Setout Costs $24,423.00
Category Amount
Pile Setout $15,973.00
Site Establishment $4,313.75
Processing / Admin $4,136.25
Metric Subtotal (To Date) $24,423.00
Metric Total (Inc. Forecast) $24,423.00
RF Sons - Survey & Setout Costs $22,679.10
Category Amount
Setout Files $20,887.30
Column/Bolt Checks $1,140.70
Monitoring $651.10
RF Sons Subtotal (To Date) $22,679.10
RF Sons Total (Inc. Forecast) $22,679.10
Combined Survey & Setout Costs Summary $47,102.10
Subcontractor To Date Forecast Total
Metric Survey $24,423.00 $0.00 $24,423.00
RF Sons Engineering $22,679.10 $0.00 $22,679.10
COMBINED TOTAL $47,102.10 $0.00 $47,102.10
Less: Tender Allowance (Item 5.1.1A.7.1) ($47,565.00)
ESTIMATED VARIANCE (Actual Cost Method) ($462.90)

Note: The variation claim uses the proportional method ($40,430.25) based on EW-11A/EW-31 scope increases.
This cost tracking section shows actual expenditure for internal monitoring and forecasting purposes.

Justification Summary - Proportional Scope Increase
  • Survey Scope is Proportional to Physical Works: More piles and retaining walls = more survey setout points
  • Piling Increase (EW-11A): RFT 102 piles to IFC 129 piles (+26%). Each pile requires centre setout, cap extent, and as-built verification
  • Temporary Retention Increase (EW-31): RFT $660K to Actual $1.6M (+143%). 19 retaining walls requiring survey control across all stations
  • Blended Approach: 50% weighting to each scope component produces fair multiplier of 1.85x
  • Valuation Method: NZS3910:2023 Clause 9.3.5 - proportional adjustment to Schedule of Prices rate
Scope Increase by Station
Station RFT Piles IFC Piles Pile Increase Retaining Walls
Glen Innes 25 29 +16% 2
Takanini 33 54 +64% 11
Te Mahia 44 46 +5% 6
TOTAL 102 129 +26% 19