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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 128 typically grows in valley and foothill grassland (CNPS 2019). The microhabitat for caper-fruited tropidocarpum includes alkaline clay soils (CDFW 2019). Caper- fruited tropidocarpum is threatened by grazing, military activities, trampling, and non-native plants (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-18, and MM BIO-19 would reduce potential impacts to caper-fruited tropidocarpum to: Less than Significant with Mitigation Incorporated. b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, or regulations or by the California Department of Fish and Wildlife or the U.S. Fish and Wildlife Service? Less than Significant with Mitigation Incorporated. Fifteen sensitive natural communities were identified as having the potential to occur within the Study Area based on review of the CNDDB (CDFW 2019). These include: alkali meadow, alkali seep, northern claypan vernal pool, northern hardpan vernal pool, valley needlegrass grassland, cismontane alkali marsh, coastal and valley freshwater marsh, coastal brackish marsh, elderberry savanna, Great Valley cottonwood riparian forest, Great Valley mixed riparian forest, Great Valley valley oak riparian forest, sycamore alluvial woodland, valley sink scrub, and valley oak woodland. Further discussion of these habitat types as they relate to potential Impact Areas can be found in the species specific discussions above. Implementation of Mitigation Measures MM BIO-12, for mitigation of potential impacts to vernal pool invertebrates, and MM BIO-1b, for mitigation of potential impacts to wetlands, would reduce potential impacts to alkali meadow, alkali seep, northern claypan vernal pool, northern hardpan vernal pool, cismontane alkali marsh, coastal and valley freshwater marsh, coastal brackish marsh, and valley sink scrub habitats to: Less than Significant with Mitigation Incorporated. Implementation of Mitigation Measure MM BIO-13, for mitigation of potential impacts to Valley Elderberry Longhorn Beetle, would reduce potential impacts to elderberry savanna to: Less than Significant with Mitigation Incorporated. Implementation of Mitigation Measure MM BIO-19, for mitigation of potential impacts to special-status plants as a result of minor vegetation removal, would reduce potential impacts to Great Valley cottonwood riparian forest, Great Valley mixed riparian forest, Great Valley oak riparian forest, sycamore alluvial woodland, and valley oak woodland to: Less than Significant with Mitigation Incorporated. The Proposed Project would have the potential to minimally impact valley needlegrass grassland. Given the small and temporary footprint of each Impact Area, potential impacts to valley needlegrass grassland would be Less than Significant.