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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 106 Palmate-bracted salty bird's-beak (Chloropyron palmatum) Palmate-bracted salty bird’s beak is listed as Endangered under FESA and CESA, and it has a CRPR of 1B.1. This species is an annual hemiparisitic herb in the broomrape family, and it blooms from May through October (CNPS 2019). It is endemic to California, and its current range includes the Central Valley (CNPS 2019; Jepson Flora Project 2019). It is presumed extirpated from San Joaquin County. It typically grows on alkaline soils within chenopod scrub and valley and foothill grasslands (CNPS 2019). Palmate-bracted salty bird’s beak typically occurs on Pescadero silty clay, which is alkaline, along with Distichlis, Frankenia, and other species characteristic of chenopod scrub (CDFW 2019). This species is threatened by agriculture, urbanization, vehicles, altered hydrology, grazing, and development (CNPS 2019). Potentially suitable habitat for palmate-bracted salty bird’s-beak is present within the Study Area. However, this species has low potential to occur within the Study Area because the Study Area is located on the edge of its known range so potential impacts would be less than significant. Implementation of Mitigation Measures MM BIO-1b, MM BIO-18, and MM BIO-19 would further avoid, minimize and/or reduce the potential for impacts to palmate- bracted salty bird’s-beak. Bolander's water-hemlock (Cicuta maculata var. bolanderi) Bolander’s water-hemlock has a CRPR of 2B.1, but it is not listed under FESA or CESA. This species a perennial herb in the carrot family, and it blooms from July through September (CNPS 2019). The current range of this species in California includes the southern Sacramento Valley, Central Coast, and South Coast (CNPS 2019; Jepson Flora Project 2019). It is presumed extirpated from Santa Barbara County. It typically grows in coastal freshwater or brackish marshes and swamps (CNPS 2019). Threats to Bolander’s water-hemlock include development, non-native plants, and hydrological alterations (CNPS 2019). This species has moderate potential to occur within the Study Area based on the presence of potentially suitable habitat. Implementation of Mitigation Measures MM BIO-1b, MM BIO-18, and MM BIO-19 would reduce potential impacts to Bolander’s water-hemlock to: Less than Significant with Mitigation Incorporated. Slough thistle (Cirsium crassicaule) Slough thistle has a CRPR of 1B.1 but is not listed under FESA or CESA. This species is an annual or perennial herb in the sunflower family, and it blooms from May to August (CNPS 2019). It is endemic to California, and its current range is limited to the San Joaquin Valley (CNPS 2019, Jepson Flora Project 2019). It typically grows in chenopod scrub, marshes and swamps, and riparian scrub (CNPS 2019). The microhabitat for slough thistle includes sloughs, riverbanks, and marshy areas (CDFW 2019). Threats to this species include agriculture and