I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Affected Environment and Environmental Impacts October 2005 Preferred Alternative The preferred alternative would not impact the fulvous whistling duck. Potential suitable habitat for the duck in the study area is limited to a small, narrow band of riparian vegetation along the Santa Cruz River that lacks sufficient vegetation cover and density to support fulvous whistling duck nesting. Mitigation The preferred alternative would implement measures to minimize impacts to vegetation and restore any vegetation losses resulting from construction. The fulvous whistling duck would benefit from the mitigation measures outlined in the revegetation plan developed for this project. Conclusion Fulvous whistling duck are documented to occur within two miles of the project area; however, potential suitable habitat in the study area is limited to a small, narrow band of riparian vegetation along the Santa Cruz River that lacks sufficient vegetation cover and density to support fulvous whistling duck nesting. Plants Threatened/Endangered Species Species For purposes of this assessment, federally listed plant species include endangered, threatened, proposed, or candidate species as defined in the ESA. The list of federal species used in this report was developed from the federally listed, proposed, and candidate species for Pima County from the USFWS Arizona Ecological Field Office website. The species list contains 4 endangered and 1 candidate species (Table 4-4). No federally listed plant species occur in the project area because the project area is either: 1) clearly outside of the known geographic or elevational range of the species; or, 2) does not contain habitat characteristics known to support the species. Common Name Table 4-4. Special Status Plant Species Scientific Name Status Huachuca Water Umbel Lilaeopsis schaffneriana spp. recurva Endangered Kearney Blue Star Amsonia kearneyana Endangered Nichol’s Turk’s Head Cactus Echinocactus horizonthalonius var. Endangered nicholii Pima Pineapple Cactus Coryphantha scheeri var. robustispina Endangered Acuna cactus Echinomastus erectocentrus var. acunensis Candidate Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-34 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Affected Environment and Environmental Impacts October 2005 Impacts No Build Alternative No federally listed plant species occur in the project area; therefore, the no build alternative would have no impacts upon these species. Preferred Alternative No federally listed plant species occur in the project area; therefore, the preferred alternative would have no impacts on these species. Mitigation No federally listed plant species occur in the project area; therefore, no mitigation for federally listed plant species is necessary. Conclusion No federally listed plant species occur in the project area; therefore no impacts would occur to these species. Arizona Native Plant Law Species Species One Salvage Restricted plant species listed under the ANPL, the Tumamoc globeberry (Tumamoca macdougalii), has been documented by AGFD as occurring within 2 miles of the study area. This species is found on hot, dry, southfacing slopes of basalt and along desert washes. This species was not observed during a pedestrian survey of the study area. In addition, native plants protected by the ANPL, Marana NPPO and Pima County NPPO, such as paloverde, ironwood, mesquite and cactus, are present within the project area. Impacts No Build Alternative The no build alternative would not impact species protected by the ANPL or Marana or Pima County PPOs. Preferred Alternative Existing land uses have disturbed suitable habitat in the project area and natural vegetation in these disturbed areas has been removed. Much of the project area would occur within previously disturbed areas. Tumamoc globeberry were not observed during field reconnaissance of the project area, but undetected individuals may be impacted by construction in undisturbed areas. Native plants protected by the ANPL, Marana NPPO and Pima County NPPO are present within the project area and would be impacted by construction of the preferred alternative. Prior to construction, a native plant survey would be Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-35 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
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Bibliography October 2005 Tetra Tec
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I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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