United States Department of Transportation
i
Carbon footprint estimator, phase II : volume II - technical appendices.
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2014-03-01
[PDF-3.81 MB]
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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 to upload any analysis results to provide information for further development of the
software.
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