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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 118 <br />Mason's lilaeopsis (Lilaeopsis masonii) <br />Mason’s lilaeopsis has a CRPR of 1B.2 and is listed as Rare under CESA. It is <br />not listed under FESA. This species is a perennial rhizomatous herb in the carrot <br />family, and it blooms from April to November (CNPS 2019). It is endemic to <br />California, and its current range includes the southern Sacramento Valley, <br />northern San Joaquin Valley, Central Coast, and northeastern San Francisco <br />Bay Area (CNPS 2019, Jepson Flora Project 2019). It typically grows in marshes <br />and swamps and riparian scrub (CNPS 2019). The microhabitat for Mason’s <br />lilaeopsis includes tidal zones in muddy or silty soil formed through river <br />deposition or river bank erosion. It can be found in both brackish or freshwater <br />(CDFW 2019). Threats to this species include erosion, channel stabilization, <br />development, flood control projects, recreation, agriculture, shading that results <br />from marsh succession, and competition with non-native plants (CNPS 2019). <br />This species has moderate potential to occur within the Study Area based on the <br />presence of potentially suitable habitat. <br />Implementation of Mitigation Measures MM BIO-1b, MM BIO-18, MM BIO-19 and <br />MM BIO-20 would reduce potential impacts to Mason’s lilaeopsis to: Less than <br />Significant with Mitigation Incorporated. <br />MM BIO-20: Botanical Avoidance Zones <br />Soil investigation activities will not be conducted within the intertidal zone of <br />rivers or sloughs, as well as on in-channel islands, or shoals. If work in these <br />areas is necessary, the Impact Area will be surveyed by a qualified botanist <br />during tidal conditions that expose the intertidal area where Delta mudwort or <br />Mason’s lilaeopsis would occur. If Delta mudwort or Mason’s lilaeopsis are <br />identified, they will be flagged or mapped with a GPS for avoidance. <br />Delta mudwort (Limosella australis) <br />Delta mudwort has a CRPR of 2B.1 but is not listed under FESA or CESA. This <br />species is a perennial stoloniferous herb in the figwort family, and it blooms from <br />May to August (CNPS 2019). The current range of this species in California <br />includes the Sacramento-San Joaquin Delta region of the Central Valley, and the <br />Central Coast (CNPS 2019, Jepson Flora Project 2019). It typically grows in <br />marshes and swamps and riparian scrub (CNPS 2019). The microhabitat for <br />delta mudwort includes mud banks in marshy or scrubby riparian associations <br />(CDFW 2019). Threats to this species include stream bank alteration, levee <br />maintenance, erosion, recreational activities, and foot traffic (CNPS 2019). This <br />species has moderate potential to occur within the Study Area based on the <br />presence of potentially suitable habitat. <br />Implementation of Mitigation Measures MM BIO-1b, MM BIO-18, MM BIO-19 and <br />MM BIO-20 would reduce potential impacts to Delta mudwort to: Less than <br />Significant with Mitigation Incorporated.