I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Affected Environment and Environmental Impacts October 2005 Impacts No Build Alternative Under the no build alternative, no affects to wildlife would occur. Preferred Alternative Proposed improvements to Twin Peaks Road, Linda Vista Boulevard, and El Camino de Mañana would impact vegetation that may provide wildlife habitat. Vegetation impacts would be limited to riparian vegetation along the Santa Cruz River and desertscrub vegetation in upland areas along Linda Vista Boulevard and El Camino de Mañana. The preferred alternative would not impact wildlife movement along the Santa Cruz River. The bottom of the proposed bridge structures over the Santa Cruz River would be approximately 20 feet above the low flow channel of the Santa Cruz River, which would allow adequate clearance for wildlife movement under Twin Peaks Road. New or larger diameter drainage structures under Linda Vista Boulevard, El Camino de Mañana, and I-10 could enhance wildlife movement under the roadways. Mitigation Prior to removal of vegetation during construction, the Town of Marana would develop a revegetation plan that would comply with the Arizona Native Plant Law (ANPL), and Native Plant Protection Ordinances (NPPO) of the Town of Marana and Pima County (see Threatened/Endangered Wildlife Species page 4-26). In addition, the revegetation plan would include Corps’ recommendations from the TRDN Feasibility Study (see Mitigation in the Threatened and Endangered Section below). As a result of the revegetation plan, the value of the vegetation in the disturbed area of the project area would be improved by construction of the preferred alternative. Conclusion Proposed improvements to Twin Peaks Road, Linda Vista Boulevard, and El Camino de Mañana would impact vegetation that may provide wildlife habitat; however, as a result of the revegetation plan, the value of the vegetation in the project area would be improved. The preferred alternative would not impact wildlife movement along the Santa Cruz River and may enhance wildlife movement under Linda Vista Boulevard, El Camino de Mañana, and I-10 in new or larger diameter drainage structures. Threatened/Endangered Wildlife Species Species For purposes of this assessment, federally listed wildlife species include endangered, threatened, proposed, or candidate species as defined in the Endangered Species Act (ESA) of 1973, as amended (Endangered Species Act Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-26 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Affected Environment and Environmental Impacts October 2005 1988). The list of federal wildlife species used in this report was developed from the federally listed, proposed, and candidate wildlife species for Pima County from the U.S. Fish and Wildlife Service’s (USFWS) Arizona Ecological Field Office website. The species list contains 16 endangered and threatened, 1 proposed endangered, and 2 candidate wildlife species (Table 4-3). It was determined that listed species or suitable habitat could be impacted by the Preferred Alternative; therefore, a Biological Evaluation (BE) was prepared. The findings of this BE, entitled Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista Biological Evaluation, July 27, 2004 is summarized below. Of the 19 species described above, 13 were not evaluated further 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. Of the six remaining species, one federally listed species, cactus ferruginous pygmy-owl (Glaucidium brasilianum cactorum), has been documented by Arizona Game and Fish Department (AGFD) as occurring within two miles of the study area. Furthermore, the study area contains suitable habitat for five additional federally listed species: desert pupfish (Cyprinodon macularius), Gila chub (Gila intermedia), Gila topminnow (Poeciliopsis occidentalis occidentalis), southwestern willow flycatcher (Empidonax traillii extimus), and yellow-billed cuckoo (Coccyzus americanus). Each of these species is discussed below. Table 4-3. Special Status Wildlife Species Common Name Scientific Name Status Bald Eagle Haliaeetus leucocephalus Threatened Cactus Ferruginous Pygmy-Owl Glaucidium brasilianum cactorum Endangered California Brown Pelican Pelecanus occidentalis californicus Endangered Chiricahua Leopard Frog Rana chiricahuensis Threatened Desert Pupfish Cyprinodon macularius Endangered Gila Topminnow Poeciliopsis occidentalis occidentalis Endangered Jaguar Panthera onca Endangered Lesser Long-nosed Bat Leptonycteris curasoae yerbabuenae Endangered Loach Minnow Tiaroga cobitis Threatened Masked Bobwhite Colinus virginianus Endangered Mexican Gray Wolf Canis lupus baileyi Endangered Mexican Spotted Owl Strix occidentalis lucida Threatened Ocelot Leopardus pardalis Endangered Sonoran pronghorn Antilocapra americana sonoriensis Endangered Southwestern Willow Flycatcher Empidonax traillii extimus Endangered Spikedace Meda fulgida Threatened Gila Chub Gila intermedia Proposed Endangered Sonoyta Mud Turtle Kinosternon sonoriense longifemorale Candidate Yellow-billed Cuckoo Coccyzus americanus Candidate Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-27 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
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Interstate 10 Traffic Interchange a
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Draft Environmental Assessment Octo
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Mitigation Measures October 2005
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AVRA VALLEY RD MARANA I-10 SCENIC D
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Project Purpose and Need October 20
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Conclusion October 2005 Interstate
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Bibliography October 2005 CHAPTER 8
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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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