I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Affected Environment and Environmental Impacts October 2005 Approximate Location (MP) Mitigation Table 4-2. Proposed Additional Drainage Easements Existing Easement Width (feet) Proposed Easement Width (feet) Additional Easement Needed (acres) 244.48 50 150 1.2 244.81 25 75 1.0 244.94 None 120 1.6 245.16 None 100 2.4 245.38 50 120 2.3 The Town of Marana would conduct all acquisitions and relocations in accordance with the Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970, as amended. Sections 28-1841 through 28-1853 of Arizona Revised Statutes would be followed to provide for implementation of the Federal Relocation Assistance Program on a state level. During individual property rightof-way negotiations, the Town of Marana would consider the effects of partial property takes. During individual property right-of-way negotiations, the Town of Marana would address businesses access across other parcels to reach the access roadway. Conclusion The preferred alternative would be consistent with the transportation and land use elements of the Town of Marana and Pima County general plans and would assist in attaining these elements of the plans. Although property would be acquired to construct the proposed improvements, the impacts associated with these acquisitions would be minimized by following the Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970, as amended, and Sections 28- 1841 through 28-1853 of Arizona Revised Statutes. Land Resources The following sections discuss conditions pertaining to land resources found within the study area. Components of land resources include topography, soils, mineral resources, and agriculture. Topography Existing Conditions Elevations in the study area range from approximately 2,100 feet above sea level (a.s.l.) along the Santa Cruz River to over 2,500 feet at Rillito Peak on the west side of I-10 and south of Avra Valley Road. In general, the topography of the study area is relatively flat along the Santa Cruz River, with gently sloping terrain Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-4 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Affected Environment and Environmental Impacts October 2005 to the east and west of the Santa Cruz River. Slopes angle toward the Santa Cruz River. Slopes increase in the eastern portion of the study area near the foothills of the Santa Catalina Mountains and Tortolita Mountains. The Santa Cruz River and floodplain is the dominant topographic feature in the project area. With the exception of the Santa Cruz River, there are no unique or important topographic features in the study area. Impacts No Build Alternative The no build alternative would have no impact on topography in the project area. Preferred Alternative Although the preferred alternative would construct an elevated roadway and bridges over the Santa Cruz River, I-10, and the UPRR, existing slopes and other topographic features in the project area, would not be affected. The low flow channel of the Santa Cruz River would be widened to compensate for the roadway and bridge embankment fill placed within the high flow Santa Cruz River channel (see Floodplain Section, page 4-14); however, these impacts would not affect the Santa Cruz River flows or functions. Mitigation As described in the previous paragraph, no mitigation measures for topography are necessary, if the preferred alternative were constructed. Soils Existing Conditions Soil types were identified for the study area through a review of comprehensive maps compiled by the United States Department of Agriculture, Natural Resources Conservation Service (NRCS) compiled in 2003, and the Arizona Agricultural Experiment Station in 1969. As would be expected in a fluvial depositional system, soils vary widely throughout the study area, often changing over distances of tens of feet. Soils are predominantly of the Anthony, Agua and Grabe Series. Anthony series consists of well-drained sandy loams to gravelly sandy loams. These soils are formed in mixed material that was deposited on flood plains and alluvial fans by rivers and streams. Slopes are 0 to 5 percent. Permeability of these soils is moderately rapid and the hazard of erosion is moderate. These soils are found throughout the study area. Agua Series soils consist of well-drained fine sandy loams about 2 feet thick over fine sand. These soils formed in mixed material that was deposited on flood plains by rivers and streams. Deposits of the Aqua series are found on the flood plain of the Santa Cruz River. Slopes are generally level and runoff is slow. Hence, the hazard of erosion is slight to moderate. Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-5 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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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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