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Biological Resources Special-status plant and wildlife species present or potentially present in the biological study area were identified through a literature search using the California Department of Fish and Wildlife's (CDFW) California Natural Diversity Database (CNDDB; CDFW 2021 a) and the California Native Plant Society's Inventory of Rare and Endangered Vascular Plants of California (CNPS 2021 a). Dudek's wildlife biologist Matt Ricketts conducted a reconnaissance-level field assessment of the biological study area on April 12, 2021. The reconnaissance consisted of documenting vegetation communities and land cover types present on the project site, searching for potentially jurisdictional aquatic resources, and assessing habitat for special-status plant and wildlife species within the biological study area. Twenty-seven wildlife species or signs of them were observed during the April 2021 field reconnaissance and 26 special status plant species were identified as occurring or potentially occurring in the project's vicinity. Based on the results of the literature review and the April 2021 field reconnaissance, 39 special-status wildlife species were identified as occurring or potentially occurring in the project's vicinity. Of these, 31 species were removed from consideration due to the lack of suitable habitat within or adjacent to the project site or the project site being outside of the species' known range. The project site does not overlap with any designated critical habitat units for California red-legged frogs. However, the project site does contain suitable habitat for the Alameda whipsnake and is also within Unit 3 (Hayward-Pleasanton Ridge) of USFWS- designated critical habitat for Alameda whipsnake. Most of the existing unofficial bike trail passes through coast live oak woodland with closed-to-semi-open canopy with occasional openings supporting small areas of coyote brush scrub. There is also a small patch of high-quality Alameda whipsnake habitat associated with California sage scrub growing on the steep and rocky east-facing slope in the western portion of the biological study area between the existing trail segments. There are several known Alameda whipsnake occurrences on Pleasanton Ridge, thus the project site is contiguous with occupied habitat and high-quality scrub habitat likely to support the subspecies. • Mitigation Measure BIO-1 — Special-Status Plant Compensatory Mitigation Cultural Resources Dudek's staff completed a cultural resources report that evaluated the project's potential impacts on cultural resources and its archaeologist, William Burns, conducted an extensive survey of the Area of Potential Effects (APE). No cultural resources were identified during the survey. • Mitigation Measure CUL-1 —Treatment of Unanticipated Cultural Resources • Mitigation Measure CUL-2 —Treatment of Unanticipated Human Remains Page 4 of 7