Page 882 - tesoro_sdeir0218

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

Hydrology and Water Quality

The Reduced Development Area Alternative would reduce the development area of the Project
site, resulting in lesser impacts related to hydrology due to a shrunken development footprint.
Development under this alternative would decrease the amount of storm water runoff and would
require less alteration to existing drainage patterns due to the reduced amount of impervious
surfaces. As with the proposed Project, it is assumed that application of BMPs including
development of on-site storm drain system would ensure that impacts to storm drain infrastructure
are less than significant. The proposed storm drain system would connect to the existing storm
drain system previously developed as part of the Phase A development. As with the proposed
Project, hydrology impacts resulting from this alternative would be less than significant.

As with the proposed Project, there is a potential for construction-related surface erosion with the
Reduced Development Area Alternative. Potential impacts from this alternative would be less than
the proposed Project due to the reduced development footprint. Both the proposed Project and
the Reduced Development Area Alternative would result in surface runoff after buildout which
would have a different composition in comparison to the existing, undeveloped condition.
Consistent with the proposed Project, this alternative would be required to comply with applicable
regulations related to water quality, including the LID Ordinance and National Pollutant Discharge
Elimination System (NPDES) permit requirements which would minimize potential short-term,
construction-related and long-term, operational water quality impacts. Consistent with the
proposed Project, water quality impacts from this alternative would be reduced to a level
considered less than significant. Therefore, impacts associated with the Reduced Development
Area Alternative would be less than the proposed Project; however, the less than significant
impact conclusion would be the same.

Land Use and Planning

The Reduced Development Area Alternative would result in the development of a residential
project, consisting of 245 dwelling units within the southwestern portion of the Project site.
Additionally, the amount of parkland and trail acreage associated with the Reduced Development
Area Alternative would also be less than with the proposed Project, but would be commensurate
with the anticipated demand associated with the number of dwelling units. Other land uses,
including a recreation center and senior housing (113 age-restricted units) would be consistent
with what is proposed for the proposed Project, although the recreation uses may be reduced in
size and relocated to better fit with the alternative design. Consistent with the proposed Project,
the Reduced Development Area Alternative would comply with applicable development guidelines
to ensure compatibility of this alternative with the existing Phase A development. The majority of
the Project site would remain in its natural state; but, a reduced number of housing units
corresponds to a reduced number of housing opportunities. Also, this alternative would result in
reduced park and trail acreage compared to the proposed Project and would not provide improved
connectivity of the Cliffie Stone Trail from its existing terminus to the trails north of the project site.
Like the proposed Project, the Reduced Development Area Alternative would be consistent with
goals and policies of relevant local and regional planning programs. Impacts associated with this
Alternative would be less than the proposed Project; however, the less than significant impact
conclusion would be the same.

Mineral Resources

There are no known construction aggregate resources on the project site. Therefore, as with the
proposed project, implementation of the Reduced Development Area Alternative would not result
in the loss of availability of a known construction aggregate resource that would be of value to the
region and residents of the State or the loss of availability of a locally important mineral resource

R:\Projects\BLC\3BLC000100\Draft EIR\6.0 Alternatives.docx 6-29 Alternatives to the Proposed Project