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

As shown on Table 6-5, the changes in the calculated volume to capacity ratios indicate that the
Modified 2012 Santa Clarita Valley Area Plan Alternative would contribute to cumulatively
significant traffic impacts at six of the seven County intersections. As shown on Table 6-6, the
changes in the calculated volume to capacity ratios indicate that the Modified 2012 Santa Clarita
Valley Area Plan Alternative would contribute to cumulatively significant impacts at three of the
four City intersections. As shown on Table 6-6, the changes in calculated volume to capacity
ratios indicate that the potential contribution of Modified 2012 Santa Clarita Valley Area Plan
Alternative traffic to cumulative traffic impacts can be mitigated to less than significant levels at
the McBean Parkway/Copper Hill Drive intersection, while impacts at Rye Canyon Road-Copper
Hill Drive/Newhall Ranch Road and Copper Hill-Drive/Decoro Drive intersections are considered
significant and unavoidable.

Therefore, the Modified 2012 Santa Clarita Valley Area Plan Alternative would not avoid any
significant and unavoidable impacts identified for the proposed Project and would increase
cumulative impacts to include two additional City intersections: Rye Canyon Road-Copper Hill
Drive/Newhall Ranch Road and Copper Hill-Drive/Decoro Drive intersections. Therefore, the
Modified 2012 Santa Clarita Valley Area Plan Alternative would result in an increased impact
conclusion when compared to the proposed project.

Tribal Cultural Resources

The Modified 2012 Santa Clarita Valley Area Plan Alternative would reduce the development area
of the Project site, resulting in a reduction in grading and ground disturbance. As addressed in
Section 5.18 of this Draft EIR, the site contains no known tribal cultural resources. Consistent with
the proposed Project, excavation in native soils always has the potential to uncover unknown
resources, including sacred lands and human remains, and there is no way to tell if the
development area identified for this alternative contains unknown resources that the proposed
Project site does not. However, as with the proposed Project, potential impacts to tribal cultural
resources under this alternative can be mitigated to a level considered less than significant.

Utilities

This alternative would decrease the number of residential units and the number of proposed
residents, therefore, the demand on utilities (water, wastewater, and solid waste) would be less
than the proposed Project. This alternative would require less water and generate less wastewater
and solid waste. However, as with the proposed project, these impacts are less than significant
with implementation of the mitigation program identified in Section 5.19, Utilities, of the Draft
SEIR.

Conclusions

Ability to Avoid or Substantially Lessen the Significant Impacts of the Project

Development of the Project site with the Modified 2012 Santa Clarita Valley Area Plan Alternative
would reduce development intensity compared to the proposed Project. In general, the degree of
impacts for most topics would be less with this alternative due to the decrease in development
footprint. The Modified 2012 Santa Clarita Valley Area Plan Alternative would avoid significant
and unavoidable impacts related to aesthetics due to compliance with all applicable ordinances
and regulations related to development in Hillside Management Areas and along significant
ridgelines. However, the Modified 2012 Santa Clarita Valley Area Plan Alternative would result in
similar significant and unavoidable traffic impacts when compared to the proposed Project, plus
this alternative would result in additional significant and unavoidable impacts to two City
intersections.

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