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Program: HTP North CorridorPackage: All (5)Scenario: BaselineBoundary: A1-A5, B, C, D reported separatelyDataset: EC3 snapshot 2026-07-14Method: EN 17472 / TRACI 2.1
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LCIA indicators
TRACI 2.1 characterisation of the full inventory, six impact categories beyond carbon · Baseline
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Global warming potential
GWP
tCO2e
184,620
At baseline
A1-A3 70%A4-A5 8%B 15%C 7%
Largest contributor
Precast segmental lining, C50/6034%
Acidification potential
AP
t SO2e
434.1
At baseline
A1-A3 70%A4-A5 8%B 15%C 7%
Largest contributor
Reinforcement bar, grade 50038.2%
Eutrophication potential
EP
t Ne
30.2
At baseline
A1-A3 70%A4-A5 8%B 16%C 7%
Largest contributor
Bulk excavation, spoil to licensed fill26.4%
Ozone depletion potential
ODP
kg CFC-11e
12.7
At baseline
A1-A3 69%A4-A5 8%B 16%C 7%
Largest contributor
Sprayed waterproof membrane, 3mm19.8%
Smog formation potential
SFP
t O3e
5,182
At baseline
A1-A3 69%A4-A5 8%B 15%C 7%
Largest contributor
Diesel plant, bulk excavation31.1%
Fossil fuel depletion
ADPf
TJ surplus
2,148
At baseline
A1-A3 69%A4-A5 8%B 15%C 7%
Largest contributor
Grid electricity, tunnel ventilation29.6%
Result range for global warming potential
Combined by root sum of squares across data quality classes
Central estimate
184,620 tCO2e
Range, one standard deviation
169,453 to 199,787
± 8.2% of the central estimate
169,453184,620199,787
Manufacturer EPD±8%
105,784 tCO2e · 57.3%
Product-specific declaration, third party verified
Industry average±18%
15,570 tCO2e · 8.4%
Sector average declaration for the product class
Mixed±22%
54,186 tCO2e · 29.4%
Aggregated tail of 312 minor line items
Generic±32%
9,080 tCO2e · 4.9%
Background database dataset, not product specific
Carbon sensitivity to modelling assumptions
tCO2e against the baseline
-21,400 t+6,800 tBinder replacement, 0% to 50% GGBS-6,900 t+9,400 tGrid decarbonisation, stalls or accelerates-5,200 t+7,600 tData quality, generic against product EPD-3,400 t+5,900 tTransport distance, 40 km to 160 km-2,600 t+4,300 tConstruction wastage, 2% to 8%-2,100 t+3,200 tService life, 80 to 120 years
This is a different question from the range above. The band asks how well the inventory is known; this asks what happens if a modelling choice turns out to be wrong. Binder replacement dominates both, which is why it is the first lever in the scenario builder and the first clause in the specification.
Normalised impact profile
Relative to US per-capita annual reference, GWP indexed to 1.0
Global warming potential
1.00
Acidification potential
0.82
Eutrophication potential
0.64
Ozone depletion potential
0.21
Smog formation potential
0.71
Fossil fuel depletion
0.93
Normalisation exposes where the program is disproportionately impactful. Fossil fuel depletion tracks close to carbon, while ozone depletion is comparatively minor.
Package contribution by indicator
TU-03ST-01EW-01TR-01UT-01
Share of each impact indicator carried by each package
IndicatorUnitTotalContribution by package
Global warming potentialtCO2e184,620
Acidification potentialt SO2e434.1
Eutrophication potentialt Ne30.2
Ozone depletion potentialkg CFC-11e12.7
Smog formation potentialt O3e5,182
Fossil fuel depletionTJ surplus2,148
Earthworks carries a disproportionate share of smog formation and eutrophication because of diesel plant and spoil handling, even though it is a smaller share of carbon.
Life cycle stages:
A1-A3A4-A5BC
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