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Shrub/Grassland Vegetation Type <br />Dominant species within this vegetation type include blue grama, kochia (Kochia scoparia), <br />plains prickly peaz (Opuntia polyacantha), and occasionally one-seed juniper. Transect numbers <br />4 and 5 were selected to represent this vegetation community in the proposed facility azea near <br />the granite quarry. Slopes were less than 2.0 percent and the aspect was south-southwest. Total <br />plant cover ranges from 27.6 to 35.8 percent. Bare ground ranged from 64.2 to 72.4 percent. No <br />ground cover was contributed by litter or rock along either tansect. Average shrub height was <br />2.5 feet with the shrubs heavily hedged. Where trees occurred, their average height was 12 feet. <br />The potential production of native understory vegetation in normal years is typically 1,100 <br />pounds per acre of air-dry vegetation (SCS 1995). The soil existing on site has a higher percent <br />of coarse fragment (gravel) content than the soil mapped for the area by the SCS. Therefore, the <br />potential production is believed to be approximately 800 pounds per acre for this site. <br />Stream Wash Vegetation Type <br />The Stream Wash vegetation type occurs primarily along Tallahassee Creek in the floodplain <br />above the main channel. This type is subject to scouring and receives deposits of alluvium during <br />flooding (SCS 1995). As such, the vegetation extant is sparse and is primarily limited to shrub <br />and tree species along with annual weedy forbs. The dominant species include rubber rabbitbnxsh <br />(Chrysothamnus nauseosus), four-wing saltbush (Atriplex canescens), leafy spurge (Euphorbia <br />esula), and kochia. A few scattered tamarisk (Tamarix ramosissima) also occur. Since the <br />proposed disturbance to this vegetation type would be limited to 2 river crossings, no transects <br />were run in this type. The potential production of native understory vegetation was not rated for <br />this type of soil map unit by the SCS. The production potential of this unit is assumed to be <br />negligible. <br />Riparian Vegetation Type <br />The Riparian vegetation type occurs along Tallahassee Creek, primarily as a comparatively large, <br />nearly level floodplain bench above the main channel. The dominant species include tamarisk, <br />plains cottonwood (Populus sargentil), peach-leaf willow (Salix amygdaloides), and rubber <br />rabbitbrush. Since this vegetation type is not proposed to be disturbed, no transects were located. <br />The potential production of native understory vegetation was not rated for this type by the SCS. <br />The forage production potential of this unit is assumed to be negligible. <br />Grassland Vegetation Type <br />Dominant species within this vegetation type include blue grama, tree cholla (Cylindropuntia <br />imbricata), and kochia where soils are disturbed by livestock. Transect number 8 was selected to <br />represent this vegetation community in the proposed facility area south of Tallahassee Creek. <br />Slopes were nearly level. Total plant cover was 30.7 percent while baze ground was 66.2 percent. <br />Litter and rock contributed 3.2 percent ground cover. The potential production of native <br />understory vegetation in normal years is typically 1,100 pounds per acre of air-dry vegetation <br />(SCS 1995). The soil existing on site has a higher percent of coarse (gravel) fragment content <br />than the soil mapped for the azea by the SCS. Therefore the potential production is believed to be <br />approximately 800 pounds per acre for this site. <br />Frans Range Aggregates, LLC- Parkdde Quarry <br />DMG ]12 Permit Amendment <br />Page 43 <br />