WRA conducted a wetland delineation, biological assessment, rare plant survey and ranked vernal pool evaluation of the entire 3,500-acre undeveloped portion of Mather Field in Sacramento, California. The jurisdictional wetlands delineation established the boundaries of over 880 wetland features, many of which were vernal pools. All wetland features were mapped in the field using GPS equipment to accurately depict their location and size. WRA assessed and mapped the habitats present within the study area to determine their potential to host rare wildlife species recorded from the vicinity of Mather Field, such as vernal pool tadpole shrimp and California linderiella. Rare plant surveys were conducted for vernal pool species plant species, including legenere, Ahart's dwarf rush, and Bogg's lake hedge hyssop. For each vernal pool, observed biotic features and abiotic features were compiled into a database. Two agency methods for assessing vernal pools were combined to create a unique system used to rank the ecological value of each vernal pool. Using ArcView software, the information was used to create a map that represented the relative habitat value of each pool.