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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 122 <br />Implementation of Mitigation Measures MM BIO-1b, MM BIO-12, MM BIO-18, <br />and MM BIO-19 would further avoid, minimize and/or reduce the potential for <br />impacts to prostrate vernal pool navarretia. <br />Colusa grass (Neostapfia colusana) <br />Colusa grass is listed as Threatened under FESA, Endangered under CESA, and <br />has a CRPR of 1B.1. This species is an annual herb in the grass family, and it <br />blooms from May through August (CNPS 2019). It is endemic to California, and <br />its current range includes the Central Valley in Colusa, Merced, Solano, and <br />Stanislaus counties (CNPS 2019; Jepson Flora Project 2019). However, it is <br />presumed extirpated from Colusa County. It typically grows in large vernal pools <br />with adobe soils (CNPS 2019). Colusa grass is threatened by agriculture, <br />development, overgrazing, hydrological alterations, non-native plants, and habitat <br />fragmentation and loss (CNPS 2019). Potentially suitable habitat for Colusa <br />grass is present within the Study Area. However, this species has low potential to <br />occur within the Study Area because the Study Area is located on the edge of its <br />known range . <br />Implementation of Mitigation Measures MM BIO-1b, MM BIO-12, MM BIO-18, <br />and MM BIO-19 would reduce potential impacts to Colusa grass to: Less than <br />Significant with Mitigation Incorporated. <br />Slender Orcutt grass (Orcuttia tenuis) <br />Slender Orcutt grass is listed as Threatened under FESA, Endangered under <br />CESA, and has a CRPR of 1B.1. This species is an annual herb in the grass <br />family, and it blooms from May to September (CNPS 2019). It is endemic to <br />California, and its current range includes the Inner North Coast Ranges, Cascade <br />Ranges, Sacramento Valley, and Modoc Plateau (CNPS 2019, Jepson Flora <br />Project 2019). It typically grows in vernal pools (CNPS 2019). The microhabitat <br />for slender Orcutt grass includes gravelly substrates (CDFW 2019). Threats to <br />this species include agriculture, residential development, grazing, trampling, <br />vehicles, recreational activities, logging, fire, and 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-12, MM BIO-18, <br />and MM BIO-19 would reduce potential impacts to slender Orcutt grass to: Less <br />than Significant with Mitigation Incorporated. <br />Sacramento Orcutt grass (Orcuttia viscida) <br />Sacramento Orcutt grass is listed as Endangered under FESA and CESA, and <br />has a CRPR of 1B.1. This species is an annual herb in the grass family, and it <br />blooms from April to July (CNPS 2019). It is endemic to California, and its <br />current range is limited to the Sacramento Valley (CNPS 2019, Jepson Flora <br />Project 2019). It typically grows in vernal pools (CNPS 2019). Threats to this