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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 80 and high visibility fencing or flagging will be installed to delineate the 6- meter avoidance buffer. Ricksecker’s water scavenger beetle (Hydrochara rickseckeri) Ricksecker’s water scavenger beetle has a NatureServe ranking of G2S2 and is included on CDFW’s Special Animals List but is not listed under FESA or CESA. This species is an aquatic beetle typically known from shallow water habitats. It is endemic to California, and it has been detected in Lake, Marin, Placer, Sacramento, San Joaquin, San Mateo, Solano, and Sonoma counties. Specific habitat requirements for this species are not known but may include a variety of aquatic habitats including artificial ponds. Both adults and larvae of this species are aquatic (NatureServe 2019a). Ricksecker’s water scavenger beetle has moderate potential to occur within the Study Area based on the presence of suitable habitat. Implementation of Mitigation Measures MM BIO-1 and MM BIO-12 would avoid and minimize adverse impacts to suitable habitat and would reduce potential impacts to Ricksecker’s water scavenger to: Less than Significant with Mitigation Incorporated. Curved-foot hygrotus diving beetle (Hygrotus curvipes) Curved-foot hygrotus diving beetle has a NatureServe ranking of G1S1 and is included on CDFW’s Special Animals List but is not listed under FESA or CESA. This species is a predaceous diving beetle known only from Alameda and Contra Costa counties (NatureServe 2019b). Specific habitat requirements and life history for this species are not known, although like other beetles in the family, both larvae and adults are predators of other aquatic organisms. Curved-foot hygrotus diving beetle has moderate potential to occur within the Study Area based on the presence of suitable habitat. Implementation of Mitigation Measures MM BIO-1 and MM BIO-12 would avoid and minimize adverse impacts to suitable habitat and would reduce potential impacts to curved-foot hygrotus diving beetle to: Less than Significant with Mitigation Incorporated. Vernal pool tadpole shrimp (Lepidurus packardi) Vernal pool tadpole shrimp is listed as Endangered under FESA but is not listed under CESA. It has a NatureServe ranking of G4S3S4 and is included on CDFW’s Special Animals List. This species is a 0.6 to 3.3-inch aquatic crustacean with a shield-like carapace, found in ephemeral freshwater habitats. It is endemic to California, and is patchily distributed throughout the Central Valley, from Shasta County to Tulare County, with isolated occurrences in Alameda and Contra Costa counties. It typically occurs in vernal pools containing clear to highly turbid water. They feed on both living organisms, such as fairy shrimp, as well as detritus. The vernal pool tadpole shrimp produces