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5.7 Biological Resources

of the U.S.” because there is no significant nexus to a Traditional Navigable Water. The USACE
issued an Approved Jurisdictional Determination (AJD) on December 1, 2009, confirming
that 1.745 acres of “waters of the U.S.” occur on the Project site and another 0.009 acre occurs
off site along the southern edge of Quail Lake. As described in the AJD, impacts to “waters of
the U.S.” are as follows:

• On-Site Permanent Impacts:0.04 acre (all non-wetland waters)

• Off-Site Permanent Impacts: 0.01 acre (all non-wetland waters)

Impacts to CDFW-regulated streambeds and riparian areas total 57.0 acres (48.7 acres of on-
site permanent impacts; 8.0 acres of on-site temporary impacts; and 0.3 acre of off-site
permanent impacts) (BonTerra Psomas 2015a). These impacts are further broken down as
follows:

• On-Site Permanent Impacts: 48.7 acres (13.1 acres of riparian habitat and 35.6
acres of unvegetated streambeds)

• On-Site Temporary Impacts: 8.0 acres (3.7 acres of riparian habitat and 4.3 acres
of unvegetated streambeds)

• Off-Site Permanent Impacts: 0.3 acre (0.03 acre of riparian habitat and 0.3 acre of
unvegetated streambeds)

Impacts to RWQCB-regulated waters total 55.8 acres (47.6 acres of on-site permanent
impacts; 7.9 acres of on-site temporary impacts; and 0.3 acre of off-site permanent impacts)
(BonTerra Psomas 2015a). These impacts are further broken down as follows:

• On-Site Permanent Impacts: 47.6 acres (36.6 acres of non-wetland waters and
11.0 acres of wetlands)

• On-Site Temporary Impacts: 7.9 acres (4.2 acres of non-wetland waters and 3.7
acres of wetlands)

• Off-Site Permanent Impacts: 0.3 acre (all non-wetland waters)

Additionally, the following vegetation types are associated with the drainages on the site and
fall under the jurisdiction of the CDFW: riparian herb; rush riparian grassland; southern
arroyo willow riparian; southern cottonwood willow woodland; southern willow scrub;
unvegetated wash; valley oak riparian woodland; willow riparian forest; willow riparian
woodland; alkali meadow; Baltic rush; and coastal and valley freshwater marsh.

Impacts to the drainages, wetlands, and riparian vegetation on the Project site are
considered significant due to their protected status. A less than significant impact would be
achieved through implementation of MM 7-12, which includes preservation, enhancement,
and creation of jurisdictional wetland and water features to maintain the overall pre-Project
functional values in the Mitigation Preserve. This MM would result in a “no net loss” of
functional values of jurisdictional resources, as determined by a functional assessment of
existing and proposed restoration activities. Additionally, in accordance with PDF 7-6, if a

R:\Projects\PAS\CEN\000306\Draft EIR\5.7 Bio_051117.docx 5.7-163 Centennial Project
Draft EIR