WRA biologists are conducting extensive monitoring studies on the 450-acre Silver Creek Preserve in south San Jose as part of a habitat restoration effort undertaken as mitigation for a William Lyon Homes, Inc. golf and housing development. Prior to beginning this monitoring effort, WRA prepared a comprehensive Restoration and Management Plan as required by the USFWS and Corps. Special status plant and wildlife species included in this monitoring and habitat restoration include: federal threatened bay checkerspot butterfly and California red-legged frog, federal endangered Santa Clara Valley dudleya and Metcalf Canyon jewelflower, and federal species of concern California tiger salamander and Mt. Hamilton thistle. WRA designed mitigation wetlands, riparian planting layouts, and native grassland restoration to comply with Corps, RWQCB, USFWS, and CDFG permits issued for the project. Additional rare plant and bay checkerspot butterfly annual surveys are being conducted on an off-site mitigation parcel near Kirby Canyon in the Coyote Valley.