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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 92 and north of the winter range. Hoary bat generally roosts in dense foliage of medium to large trees that are hidden from above, with few branches below, and have ground cover of low reflectivity. This species prefers open habitats or habitat mosaics, with access to trees for cover and open areas or habitat edges for foraging. Breeding habitat includes all woodlands and forests with medium to large-size trees and dense foliage. Hoary bat mate in the fall in their winter range, with delayed fertilization until the following spring. Young are born from mid-May through early July (CDFW 1990j). Hoary bat has a moderate potential to occur within the Study Area due to the presence of suitable habitat and reported occurrences within two and five miles of the Study Area. Implementation of Mitigation Measures MM AES-1, MM AES- 2, MM BIO-1 and MM BIO-15 would reduce potential impacts to hoary bat to: Less than Significant with Mitigation Incorporated. San Joaquin Pocket Mouse (Perognathus inornatus) San Joaquin pocket mouse has a NatureServe global and state rarity and imperilment ranking of G2G3 and S2S3. San Joaquin pocket mouse is a small rodent with silky pelage containing no bristles or spines and a tail that is slightly longer than 50% of their total length. The San Joaquin pocket mouse occurs between 1,100 and 2,000 ft elevation, spanning through the San Joaquin Valley, Delta, Sacramento Valley through Colusa County, and portions of the southern Coast Ranges. Habitat includes shrubby ridge tops and hillsides in dry, open grasslands or scrub areas with friable soils. Young are born and raised in burrows in the spring and early summer. San Joaquin pocket mouse has a moderate potential to occur within the Study Area due to the presence of suitable habitat and reported occurrences within two and five miles of the Study Area. Implementation of Mitigation Measure MM BIO- 1 would reduce potential impacts to San Joaquin pocket mouse to: Less than Significant with Mitigation Incorporated. American Badger (Taxidea taxus) American badger is identified as a CDFW Species of Special Concern. It has a stocky, low-slung body with short, powerful legs, identifiable by its large foreclaws and distinct black and white head markings. American badger is an uncommon solitary species that is widely distributed throughout the state except in the northern North Coast area, from below sea level to over 12,000 ft. This species inhabits a variety of open, arid habitats but is most abundant in drier open stages of most shrub, forest, and herbaceous habitats with friable soils for burrowing. Home range typically varies in size between 5 and 1,800 acres but can become much larger during breeding season as males locate receptive females. Natal dens are constructed in dry, sandy soil with sparse overstory. Breeding occurs between July and August, with young born in March and April and disperse after three to four months.