United States Department of Transportation
i
Carbon footprint estimator, phase II : volume I - GASCAP model.
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2014-03-01
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Abstract:The GASCAP model was developed to provide a software tool for analysis of the life-cycle GHG
emissions associated with the construction and maintenance of transportation projects. This phase
of development included techniques for estimating emissions from induced travel when a project
involves a capacity expansion; a life-cycle maintenance module based on recommended procedures
for maintaining a road surface over 50 years; an automated method for inputting construction
equipment activity associated with selected project types; a method based on the Highway Capacity
Manual for estimating emissions associated with project staging and the diversion of traffic around a
worksite; methods for more easily updating emissions factors in the model; and, a variety of
miscellaneous upgrades to account for SF6 emissions, upstream electricity emissions associated
with asphalt, and incorporation of additional bid-sheet codes in the materials module. Four case
studies to demonstrate the models usage were also conducted. These were: a large project case
study (reconstruction of rt 35 in Ocean County) that demonstrated the full capabilities of the model; a
smaller project (rt 47 resurfacing in Gloucester County) that focused on different staging options and
the impact on emissions from traffic; an applied case study conducted in collaboration with NJDOT
staff in the South Jersey regional office that focused on maintenance activities; and a demonstration
of the relationship between the embodied fuel cost of a project and the GHG emissions. The
software and related documentation is available for use on www.gascap.org and users are
requested t
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