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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 53 San Joaquin coachwhip is active from March through October, with breeding occurring in May, and oviposition occurring in June or July (CDFW 2000b). San Joaquin Coachwhip has a moderate potential to occur within the southern portion of the Study Area where the species range overlaps in Contra Costa and Alameda Counties, based upon the presence of suitable habitat and several occurrences within six miles to the west and south. Implementation of mitigation measures to avoid impacts to potential habitat (MM BIO-1), and individuals that could be moving through the Study Area (MM BIO-1 and MM BIO-2), would reduce impacts to San Joaquin coachwhip to: Less than Significant with Mitigation Incorporated. Coast horned lizard (Phyrnosoma blainvillii) Coast horned lizard is identified as a CDFW Priority Two Species of Special Concern (CDFW 2019b, Thompson et al 2016). Coast horned lizard is a compressed oval bodied lizard, reaching a maximum length of 4.5 inches SVL, with a row of large horns behind its head, two of which are longer and separated at the base, and two rows of fringed scales running down each side of its body. It can be tan, yellow, red, brown, or grey with dark splotches down the back, with a lightly spotted yellow, cream or beige ventral surface. The species is found from Shasta County in the North to Baja California in the South and along the California coast inland to the Sierra Nevada and west of the Mojave Desert (Sherbrooke 2003, Thompson et al 2016). Coast horned lizard is found in a wide variety of habitat types including sage scrub, dunes, annual grassland, chaparral, oak woodland, riparian woodland, coniferous forest, Joshua tree woodland, and saltbush scrub, however it requires loose fine soils for burrowing, open areas for thermoregulation and an adequate prey base of native ants and other insects. Coast horned lizard is active from February through November, peaking in April and July. Breeding occurs from March to June, with average clutch sizes of 11 eggs laid likely beginning in May, with an incubation period of approximately 60 days. Hatchlings are active from late July through November. Coast horned lizard has a moderate potential to occur within the Study Area based upon the species range, the presence of suitable habitat and several occurrences within 2.5 and five miles to the west and south, respectively. Implementation of mitigation measures to avoid impacts to potential habitat (MM BIO-1) and individuals that could be moving through the Study Area (MM BIO-1 and MM BIO-2), would reduce impacts to Coast horned lizard to: Less than Significant with Mitigation Incorporated. Giant garter snake (Thamnophis gigas) Giant garter snake is listed as Threatened under FESA and as Threatened under CESA (USFWS 2019c, CDFW 2019a). It is a large snake, reaching from 36 to 65