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5.7 Biological Resources

plant species populations that have previously been found in the Mitigation
Preserve, newly detected populations will be preserved and managed for long-
term preservation. These populations will provide baseline information for
management efforts described below and will provide information to help
determine habitat suitability in areas where propagation of rare plants may be
considered.

The Project Applicant shall prepare and implement a Special Status Plant
Species Restoration Plan covering the California androsace, crownscale,
round-leaved filaree, Mojave spineflower, sylvan scorzonella, and adobe
yampah that shall specify the following: (1) procedures for the collection and
temporary storage of seed (all available seed from every impacted occurrence
shall be collected); (2) planting procedures, including soil preparation and
irrigation; (3) a schedule and action plan to maintain and monitor enhanced,
restored, and/or created populations; (4) methods to control plant densities
(of competing plants) to promote the establishment of California androsace,
crownscale, round-leaved filaree, Mojave spineflower, sylvan scorzonella, and
adobe yampah; and (5) a list of County-approved success criteria (e.g.,
germination rates, growth, plant cover) to compare to the density of existing
populations. The Project Applicant shall develop the Special Status Plant
Species Restoration Plan and the County shall approve it prior to any
vegetation clearing or grading on the site. Adoption of this plan shall be used
as the performance standard. An overview of the plan objectives is provided
in the Biological Resource Mitigation Program to be submitted and approved
by the County prior to issuance of grading permits.

Prior to the commencement of vegetation clearing and/or grading activities,
the Project Applicant shall contract a qualified firm to harvest California
androsace, crownscale, round-leaved filaree, Mojave spineflower, sylvan
scorzonella, and adobe yampah seeds from the impacted populations on the
Project site. The seeds shall be collected in the manner and time described in
the Special Status Plant Species Restoration Plan. The harvested seed shall be
used for the enhancement, restoration, or creation of these species’
populations to be preserved in open space areas on the Project site.
Additionally, prior to implementation of the Plan, a focused survey for the
special status species impacted (listed above) shall occur in the preserve areas
to document existing populations.

The previously documented populations of California androsace, round-
leaved filaree, Mojave spineflower, sylvan scorzonella, and adobe yampah
occurring in the designated on-site mitigation areas (north of State Route [SR]
138 and south of SR-138), and Mitigation Areas 1, 2, 3 shall be preserved in
perpetuity. These existing areas shall be enhanced, expanded, or restored or
new areas shall be created in suitable habitat in order to compensate at a 2:1
ratio for the thousands of individual special status plants that will be lost due
to the Project.

R:\Projects\PAS\CEN\000306\Draft EIR\5.7 Bio_051117.docx 5.7-174 Centennial Project
Draft EIR