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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 126 <br />Keck's checkerbloom (Sidalcea keckii) <br />Keck's checkerbloom is listed as Endangered under FESA and it has a CRPR of <br />1B.1, but it is not listed under CESA. This species is an annual herb in the <br />mallow family, and it blooms from April through June (CNPS 2019). It is endemic <br />to California, and its current range includes the southern Inner North Coast <br />Range, and the central and southern San Francisco Bay Area (CNPS 2019; <br />Jepson Flora Project 2019). It typically grows in cismontane woodland and valley <br />and foothill grasslands (CNPS 2019). The microhabitat for Keck's checkerbloom <br />includes grassy slopes in blue oak woodland on serpentine-derived, clay soils <br />(CDFW 2019). There are no listed threats to this species (CNPS 2019). This <br />species has low potential to occur within the Study Area because there is limited <br />appropriate habitat and it is on the edge of the species range. <br />Implementation of Mitigation Measures MM BIO-18, and MM BIO-19 would <br />reduce potential impacts to Keck’s checkerbloom to: Less than Significant with <br />Mitigation Incorporated. <br />Long-styled sand-spurrey (Spergularia macrotheca var. longistyla) <br />Long-styled sand-spurrey has a CRPR of 1B.2 but is not listed under FESA or <br />CESA. This species is an annual herb in the pink family, and it blooms from <br />February to May (CNPS 2019). It is endemic to California, and its current range <br />includes the Inner North Coast Ranges and the Central Valley (CNPS 2019, <br />Jepson Flora Project 2019). It typically grows in meadows and seeps and <br />marshes and swamps (CNPS 2019). The microhabitat for long-styled sand- <br />spurry includes alkaline soil (CDFW 2019). Threats to this species include <br />development, habitat alteration, agriculture, and hydrological alterations (CNPS <br />2019). This species has moderate potential to occur within the Study Area based <br />on the presence of potentially suitable habitat. <br />Implementation of Mitigation Measures MM BIO-1b, MM BIO-18, and MM BIO-19 <br />would reduce potential impacts to long-styled sand-spurrey to: Less than <br />Significant with Mitigation Incorporated. <br />Suisun Marsh aster (Symphyotrichum lentum) <br />Suisun Marsh aster has a CRPR of 1B.2, but it is not listed under FESA or <br />CESA. This species is a perennial rhizomatous herb in the sunflower family, and <br />it blooms from April through November (CNPS 2019). It is endemic to California, <br />and its current range includes the southern Sacramento Valley, Central Coast, <br />and San Francisco Bay Area (CNPS 2019; Jepson Flora Project 2019). It <br />typically grows in brackish and freshwater marshes and swamps (CNPS 2019). <br />Suisun Marsh aster is most often seen along sloughs with Phragmites, Scirpus, <br />Rubus, and Typha (CDFW 2019). Suisun Marsh aster is threatened by marsh <br />habitat alteration and loss, erosion, herbicide application, and non-native plants. <br />(CNPS 2019). This species has moderate potential to occur within the Study <br />Area based on the presence of potentially suitable habitat.