Page 1271 - trc_centennial_deir201705

5.10 Traffic, Access, and Circulation

Specifications for Public Works Construction (Greenbook) and Additions and Amendments
to the Standard Specifications for Public Works Construction (Graybook), including Traffic
Control Provisions. To avoid traffic disruption during the construction phases of each
development, MM 10-5 requires that temporary traffic controls in accordance with the
Greenbook and Graybook and a Transportation Management Plan be prepared and
implemented during Project construction activities.

Impacts would be less than significant after compliance with the Greenbook and Graybook
and the implementation of MMs 10-1 through 10-5, MM 10-29, MM 10-30, and MM 10-23.
Off-Site Impacts

Existing Plus Project Scenario

Exhibit 5.10-9, Average Daily Traffic Volumes – Project Only, shows the Project-generated
ADT volumes that would be distributed onto the study area roadway system.

An evaluation of the off-site impacts to SR-138 roadway segments and intersections and
freeway mainline segments and ramps due to buildout of the Specific Plan under existing
plus Project conditions was prepared by directly adding the traffic that would be generated
by the Project to existing conditions. The purpose of this analysis is to differentiate the
significant impacts due only to the Project from the significant impacts that would occur from
other traffic sources. To provide a conservative analysis, the Project traffic forecasts do not
reflect supplemental reductions for trip reducing measures, such as TDM measures that
would be implemented by the Project (see MM 10-29 and MM 10-30). Exhibit 5.10-10,
Average Daily Traffic Volumes – Existing (2014 and 2015) Plus Project, shows the existing
plus Project ADT volumes on the study area roadway system.

The existing plus Project analysis conservatively assumes that the existing background
traffic conditions do not change, other than changes directly due to the Project, over the
approximate 20-year time frame required to build the Project. The analysis does not include
other approved, planned and anticipated projects that would also change traffic patterns in
the study area over time.

State Route 138 Highway Segments

Using the two-lane highway methodology in the HCM 2010, the LOS for each segment of SR-
138 under existing and existing plus Project conditions are provided in Table 5.10-20.

R:\Projects\PAS\CEN\000306\Draft EIR\5.10 Traffic-051217.docx 5.10-53 Centennial Project
Draft EIR