draft mshcp narrow endemic and criteria area ... - State of California

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Southern California Edison Draft Valley-Ivyglen Transmission Project MSHCP Plant Surveys January 2008 Table 2. Survey Personnel and Dates Date Habitat Assessment 2006 April 24 April 25 April 26 April 27 May 02 May 03 May 04 Focused MSHCP Plant Surveys 2007 May 28 May 29 May 30 May 31 June 1 June 4 June 5 Surveyors: Matt Amalong; AMEC Biologist John F. Green; AMEC Botanist/Biologist Nathan Moorhatch; AMEC Biologist Patrick McConnell; AMEC Botanist 6151000801\R01-001_v2 Page 10
Southern California Edison Draft Valley-Ivyglen Transmission Project MSHCP Plant Surveys January 2008 3.0 EXISTING BIOLOGICAL SETTING The topography in the study area is generally gentle rolling hills. The approximately 58 miles of study area contains a combination of agricultural, municipal, private, and reserve land, most with previous disturbance. 3.1 Climate The study area is located within a Mediterranean climate region consisting of warm, dry summers and mild, wet winters. In summer, temperatures often reach 100º F and winter temperatures fall into the 30s, with an occasional freeze. Average annual temperature ranges are fairly moderate for the area, ranging from 49.3º F to 79.5º F. Average total precipitation for the area is approximately 10 to 15 inches per year (Western Regional Climate Center 2005). 3.1.1 2006/2007 Rain Season The 2006/2007 rain season (September 2006 through May 2007) was one of the driest winters on record for the Riverside region. The Elsinore station is the closest weather station to the project site with reliable monthly rainfall totals for the 2006/2007 rain season (i.e., no missing days during this period) (DRI 2007). The total rainfall for the 2006/2007 rain season to date was 0.44 inches (in) (1.11 centimeters [cm]), which falls extremely short of the yearly average (11.25 in [28.57 cm]) at this weather station by approximately 10.81 in (27.46 cm) (DRI 2007). 3.2 Soils The project area is located on predominantly flat areas that have historically been used for grazing and agriculture. Soils in the study area are primarily in the Monserate-Arlington- Exeter and Traver-Domino-Willows associations. These soils are characterized as level to moderately steep soils that have a surface layer of sandy loam often with a hardpan. The soils can range from very shallow to relatively deep (USDA 1971). The soils in the area do not generally have a high clay component; however, there are “lenses” of clay soils in the study area. The Traver-Domino-Willows association is considered a MSHCP sensitive soil type and includes saline-alkali soils largely located along floodplain areas of the San Jacinto River (Figure 3). Sensitive plants which may be supported by the Traver-Domino-Willows soil association include two federally listed species: San Jacinto Valley crownscale (Atriplex coronata var. notatior) and spreading navarretia (Navarretia fossalis). Other sensitive plant species found in this association include Parish's brittlescale (Atriplex parishii), Davidson's saltscale (Atriplex serenana var. davidsonii), and vernal barley (Hordeum intercedens) (County of Riverside 2003). 6151000801\R01-001_v2 Page 11
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draft mshcp narrow endemic and criteria area ... - State of California

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