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Tesoro del Valle (Phases A, B, C)
Draft Supplemental EIR

As detailed in Table 2-2 of Section 2.0, Introduction, these issues are addressed throughout this
Draft Supplemental EIR.

1.6 SUMMARY OF SIGNIFICANT ENVIRONMENTAL IMPACTS

Table 1-1 presents a summary of the environmental impacts resulting from implement of the
proposed Tesoro del Valle (Phases A, B, C) project.

For each environmental topic, Table 1-1 includes applicable mitigation measures that are
identified for impacts determined to be potentially significant. As shown in Table 1-1, the proposed
project would result in less than significant impacts with implementation of MMs for the following
topical areas evaluated in this Draft EIR:

 Air Quality  Hydrology and Water Quality
 Biological Resources  Noise
 Cultural Resources  Public Services
 Energy  Tribal Cultural Resources
 Utilities and Service Systems

As described below, significant and unavoidable aesthetics and transportation/traffic impacts
resulting from the proposed project are identified in this Draft SEIR. Because unavoidable
significant adverse impacts would result from the project, the County, as Lead Agency, must
prepare a “Statement of Overriding Considerations” before it can approve the project. A Statement
of Overriding Considerations states that the decision-making body has balanced the benefits of
the proposed project against its unavoidable significant environmental effects and has determined
that the benefits of the project outweigh the adverse effects and, therefore, the adverse effects
are considered to be acceptable. A summary of the significant and unavoidable impacts of the
project is included below.

 Aesthetics. The Project would result in a reduction of grading footprint, however the
alterations to the ridgeline as shown in Viewpoints 4, 6, 7, and 8 would continue to result
in significant and unavoidable impacts to the aesthetic/visual character of the Project site.

 Transportation/Traffic. The proposed Project would result in significant and unavoidable
impacts at the following intersections:
o The Old Road and I-5 southbound ramps. Existing With Project (PM peak hour)
and Future Cumulative With Project (AM and PM peak hours)

o The Old Road and Rye Canyon Road. Future Cumulative With Project (PM peak
hour)

o The Old Road and Magic Mountain Parkway. Future Cumulative With Project
(PM peak hour)

o I-5 southbound ramps and Magic Mountain Parkway. Future Cumulative With
Project (AM and PM peak hours).

o Copper Hill Drive and Decoro Drive. Future Cumulative With Project (AM and
PM peak hours)

o Tesoro Del Valle-Rio Norte Drive/Copper Hill Drive. Existing With Project and
Future Cumulative With Project (AM and PM peak hours)

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