I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Draft Environmental Assessment October 2005 SO2 Sulfur dioxide SPUI Single Point Urban Interchange SR State Route SWPPP Storm Water Pollution Prevention Plan TAC Technical Advisory Committee TAPA Tucson Air Planning Area TEA-21 Transportation Equity Act for the 21 st Century TEP Tucson Electric Power TI traffic interchange TRDN Tres Rios del Norte UPRR Union Pacific Railroad U.S. United States USC United States Code USFWS U.S. Fish and Wildlife Service UST underground storage tanks VIR Visual Impact Rating Vpd Vehicles per day µg/ m 3 Micrograms per cubic meter Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista xii Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Mitigation Measures October 2005 MITIGATION MEASURES The following mitigation measures and commitments are not subject to change or modification without the prior written approval of the Federal Highway Administration. Town of Marana Responsibilities: 1. The Town of Marana and the Arizona Department of Transportation would participate in an intergovernmental agreement, which would include the environmental mitigation contained within this document. 2. The Town of Marana would widen the low flow channel of the Santa Cruz River to prevent an unacceptable rise in floodwater elevations within the 100-year floodplain. (Refer to page 4-19) 3. During final design, the Town of Marana would give the local floodplain administrator the opportunity to review project plans. (Refer to page 4-19) 4. The Town of Marana would obtain an individual Clean Water Act Section 404 permit from the U.S. Army Corps of Engineers and Section 401 Water Quality Certification from the Arizona Department of Environmental Quality before construction commences. (Refer to page 4-21) 5. To comply with Section 402, a Stormwater Pollution Prevention Plan would be prepared for this project by the Town of Marana. (Refer to page 4-22) 6. Prior to construction, the Town of Marana would develop a revegetation plan that would incorporate the mitigation discussed below. (Refer to page 4-31) This revegetation plan would be provided to the contractor. Mitigation measures would include revegetation of impacted areas along the roadway and the riparian vegetation along the Santa Cruz River. Mitigation would include: • Disturbed soils would be re-seeded using species native to the project vicinity and would mirror the current plant composition to the extent possible. • Within upland areas, trees greater than 4 inches diameter at breast height and Saguaro cactus that are removed would be replaced within the overall construction footprint at a 3:1 ratio. Vegetation would be replaced in kind with a minimum container size of 15 gallons. These replacements would not occur within the clear zone of the roadway. • Within the clear zone of the roadway, creosote bush seed would be utilized in order to facilitate quick replacement of vegetation cover. • Mesquite trees greater than 4 inches diameter at breast height that are removed within the high flow channel of the Santa Cruz River would be replaced at a 3:1 ratio within the overall project limits in accordance with the revegetation plan. Vegetation would be replaced in kind with a minimum container size of 15 gallons. Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista xiii Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
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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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