Page 1970 - trc_centennial_deir201705

5.21 Climate Change

One-Time Emissions
Construction Emissions

The major construction phases included in this analysis are as follows:

• Demolition involves tearing down of buildings or structures and removal of asphalt
and concrete parking areas and walkways.

• Site Preparation involves clearing vegetation (grubbing and tree/stump removal)
and stones prior to grading.

• Grading involves cut and fill of land to ensure the proper base and slope for the
construction foundation.
• Building Construction is the construction of structures and buildings.

• Architectural Coating is the application of coatings to both the interior and
exterior of buildings or structures

• Paving is the laying of concrete or asphalt such as in parking lots or roads.

These phases would occur in connection with anticipated construction at the Project site and
related off-site Project impact areas, as described in Section 4.0, Project Description. GHG
emissions from these construction phases are largely attributable to fuel use from
construction equipment and worker commuting. Additional indirect GHG emissions would
result from the supply and delivery of water used during site grading.

Construction GHG emissions were calculated by using CalEEMod Version 2016.3.1 as
described in Section 5.11, Air Resources. Specific inputs to CalEEMod include but are not
limited to the start and finish dates of construction phases; inventories of construction
equipment to be used during each phase; areas to be paved; and areas to be painted. Output
emissions data are provided for off-road equipment and on-road vehicles.

Once construction begins (in Year 1), it will proceed continuously for approximately
20 years, with full buildout completed after 20 years. Construction emissions are calculated
for the following construction activities: grading, building, paving, and architectural coating
(painting).2 The rate of construction would vary with a variety of factors including, but not
limited to, market demand, weather, and as-found site conditions. The estimation of the
quantities of grading, building, paving, and painting on a year-by-year basis for a 20-year
project would be highly speculative. Therefore, the construction effort is initially evaluated
assuming that each construction activity would be spread equally over the applicable years.
Additionally, as further explained below, construction emissions are evaluated for a peak
grading year.

Grading would occur from Year 1 through Year 18. Preliminary grading engineering design
indicates that approximately 127 million cubic yards (mcy) of earth would be moved for the
total Project. Based on the preliminary grading estimates, the average daily grading quantity

2 Emissions modeling often includes demolition and site preparation (clearing and grubbing) activities. Demolition
required for the proposed Project would be negligible. Clearing and grubbing would be predominantly grassland, and
would occur concurrently with grading.

R:\Projects\PAS\CEN\000306\Draft EIR\5.21 ClimateChange-051117.docx 5.21-50 Centennial Project
Draft EIR