I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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AVRA VALLEY RD MARANA I-10 SCENIC DR TWIN PEAKS RD Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista MP242 SILVERBELL RD COACHLINE BLVD TANGERINE RD WADE RD Study Area SANTA CRUZ RIVER EL CAMINO DE MAÑANA ARIZONA PAVILLIONS DRIVE CORTARO RD INA RD 1-3 LINDA VISTA BLVD MP246 HARTMAN LN CAMINO DE OESTE CORTARO FARMS RD CAMINO DE OESTE TUCSON THORNYDALE RD LAMBERT LN OVERTON RD HARDY RD ORANGE GROVE RD Figure 1-2 Study Area Project Number: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Introduction October 2005 The Twin Peaks Road TI would be grade-separated with I-10 and with the UPRR and would include intersections with the I-10 eastbound and westbound frontage roads, and a newly constructed business access/circulation roadway. Twin Peaks Road would cross the Santa Cruz River on two new bridges (one eastbound and one westbound) and the I-10 eastbound frontage road, which is currently a two-way frontage road, would be converted to a one-way frontage road. The purpose and need for the project is described in the next chapter and the proposed improvements are described in greater detail in Chapter 3, Alternatives. The project area (the area where construction is expected to occur) occurs along I-10 at approximately MP 243. The project area will include slightly beyond the Twin Peaks Road tie-in on the west and slightly beyond the El Camino de Mañana/Linda Vista Boulevard intersection on the east. In addition, limited safety improvements are proposed along the I-10 frontage roads. The study area is a much larger area. Federal guidelines suggest that the study area be large enough to: 1) treat environmental issues on a sufficiently broad scope to ensure that the project will function properly without requiring additional improvements elsewhere; 2) not restrict consideration of alternatives for other reasonably foreseeable transportation improvements; and, 3) give decision-makers and the public a clearer picture of the transportation requirements in the project area and a better understanding of the project purpose. Therefore, the study area is defined as the area between the Avra Valley Road TI on the north and the Cortaro Road TI on the south and the area between the intersection of Twin Peaks Road and Silverbell Road on the west and the intersection of Linda Vista Boulevard and Thornydale Road on the east. These termini were selected because the Twin Peaks Road TI would be expected to influence traffic within this area. Existing Roadway Network The FHWA Draft Classification Map, dated 2003, classified I-10 as an urban principal interstate roadway. In the area of the proposed Twin Peaks Road TI, I-10 provides two lanes in each direction with a wide median and a posted speed limit of 75 miles per hour (mph). According to PAG, average daily traffic (ADT) volumes on the roadway vary from 52,100 vehicles per day (Vpd) north of the Avra Valley TI to 86,400 Vpd south of the Cortaro Road TI. Construction is underway on an I-10 widening project to add one through lane in each direction between the Tangerine Road and Cortaro Road TIs, which includes the Twin Peaks Road TI project area. The nearest TIs to the area of the proposed improvements include the Avra Valley Road TI, approximately 2 miles north of the Twin Peaks Road TI, and the Cortaro Road TI, approximately 2 miles south of the Twin Peaks Road TI. At the Avra Valley TI, a diamond interchange, the westbound I-10 ramps merge with a one-way, one lane roadway that parallels I-10. The eastbound I-10 ramps are separate from the two-lane, two-way frontage road that runs parallel to I-10. The two ramp intersections with Avra Valley Road are unsignalized. The Cortaro Road TI is also a diamond interchange. All Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 1-4 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Page 1: Interstate 10 Traffic Interchange a
Page 4 and 5: Draft Environmental Assessment Octo
Page 12 and 13: Mitigation Measures October 2005
Page 14 and 15: Mitigation Measures October 2005 19
Page 16 and 17: Mitigation Measures October 2005 St
Page 18 and 19: Introduction October 2005 CHAPTER 1
Page 22 and 23: Introduction October 2005 Cortaro R
Page 24 and 25: Project Purpose and Need October 20
Page 34 and 35: Alternatives October 2005 CHAPTER 3
Page 36 and 37: Alternatives October 2005 Figure 3-
Page 38 and 39: Alternatives October 2005 • Shall
Page 40 and 41: Alternatives October 2005 Interstat
Page 42 and 43: Alternatives October 2005 Road). Pr
Page 44 and 45: Alternatives October 2005 Preferred
Page 46 and 47: Alternatives October 2005 Twin Peak
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Page 50 and 51: Alternatives October 2005 Linda Vis
Page 52 and 53: Alternatives October 2005 Twin Peak
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Page 56 and 57: Alternatives October 2005 proposed
Page 58 and 59: Alternatives October 2005 Near the
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Page 62 and 63: Affected Environment and Environmen
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Affected Environment and Environmen
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Interstate 10 Traffic Interchange a
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44.20 Avra Valley Rd Twin Peaks Rd
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Public Involvement/Project Coordina
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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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