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5.20 Dry Utilities

SoCalGas Infrastructure
SoCalGas anticipates that either additional feeds from the existing distribution system in the
Project vicinity or a new system would be necessary to serve the Project’s projected demand.
This will be determined in the future as part of the Project planning and implementation
process. Regardless, MM 20.3-2 requires that the Project Applicant/Developer install, bond
for, or otherwise provide on-site natural gas facilities in coordination with SoCalGas. To
provide natural gas service to the Project, a series of transmission and distribution gas mains
would be installed in the proposed roadways. An underground extension of gas facilities will
need to be constructed east along Gorman Post Road from the proposed regulator station to
the Project’s westerly entrance, where it would follow the route along with electricity and
telephone lines through the Project site around the north side of Quail Lake. The main could
also be extended along the SR-138 roadway, just outside the road right-of-way, easterly to
the initial construction phases of the Project. Due to gas line installation requirements,
transmission main extensions would be in separate trenches within proposed roadways.
Distribution main extensions would be installed in utility corridors (shown on
Exhibit 5.20-2, Centennial Project – Dry Utility Improvements). Some of these transmission
and distribution mains may parallel each other in the same roadway. It may be necessary to
extend a high pressure line to and within the Project site for the placement of a series of
future regulator stations. The initial distribution gas source is proposed to come from
connecting, or “tapping” into an existing high pressure main west of the southwest corner of
the site near Gorman Post Road, placing a regulator station (potential easement space
needed of approximately 75 feet by 30 feet), and running distribution medium pressure
and/or transmission high pressure to and through the Project site. Gas distribution efficiency
and operating integrity require that the gas mains are looped. As the Project develops, the
mains may be tied to each other for pressure stabilization. MM 20.3-3 requires that an
additional regulator station be constructed in the future to loop the distribution system for
increased reliability.

As discussed above, SoCalGas has stated that, with appropriate expansion of infrastructure,
there are adequate natural gas supplies to serve the Project (SoCalGas 2006). All new and
upgraded on-site facilities and infrastructure, including regulators and distribution facilities,
would be implemented as part of site development and would be constructed within public
rights-of-way. Therefore, these improvements would not create additional physical impacts
beyond those addressed elsewhere in this EIR because natural gas facilities would be
implemented within the footprint of the overall development Project.

Energy Conservation in the Project

The Project would be subject to Title 24 and mandatory CALGreen Code energy efficiency
standards. However, as discussed in the Green Development Program, the Project has
committed to achieving CALGreen’s voluntary Tier 1 status, including exceeding Title 24
requirements by 15 percent for low-rise buildings and by 10 percent for nonresidential,
hotel, and high-rise residential buildings (PDFs 11-5 and 11-6, from Section 5.11, Air
Resources). Also, a minimum of 50 percent of the Project’s anticipated electrical energy
demand would be satisfied from on-site renewable energy generation (PDF 21-3 from
Section 5.21, Climate Change). The GHG emissions associated with energy use (electricity
and natural gas) were estimated based on these assumptions. A description of the ways the

R:\Projects\PAS\CEN\000306\Draft EIR\5.20 Dry Utilities-051117.docx 5.20-20 Centennial Project
Draft EIR