I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Introduction October 2005 Cortaro Road TI ramps merge with two-lane, one-way frontage roads. Both I-10 ramp intersections with Cortaro Road are signalized. Frontage roads exist along both sides of I-10 in the vicinity of the Twin Peaks Road TI. The frontage road west of I-10 provides one lane in each direction allowing two-way travel from Avra Valley Road to Arizona Pavilions Drive (just north of the eastbound Cortaro Road off-ramp). The frontage road east of I-10 provides two lanes of one-way (westbound) travel from Cortaro Road to Avra Valley Road. Twin Peaks Road from Silverbell Road to its eastern terminus west of the Santa Cruz River is classified as an arterial roadway by the Town of Marana, but Pima County classifies Twin Peaks Road as a major collector. Twin Peaks Road is under the jurisdiction of and maintained by the Town of Marana. Twin Peaks Road consists of two travel lanes in each direction with a raised landscaped median, shared use lanes, curb, gutter, and sidewalk. The posted speed limit is 35 mph. Access along Twin Peaks Road is restricted to connecting roadways. Traffic counts are available only east of Silverbell Road, where ADT volumes on the roadway are approximately 10,700 Vpd. Volumes near the eastern terminus of Twin Peaks Road are considerably less. El Camino de Mañana from the I-10 westbound frontage road to Tangerine Road is classified as a collector roadway by the Town of Marana. Pima County classifies El Camino de Mañana from I-10 to Linda Vista Boulevard as an urban collector and a minor collector from Linda Vista Boulevard to Tangerine Road. El Camino de Mañana is under the jurisdiction of both the Town of Marana and Pima County, but is maintained by the Town of Marana through an intergovernmental agreement. The roadway provides one travel lane in each direction with no shared use lanes, curb, gutter, or sidewalks. The posted speed limit is 35 mph along El Camino de Mañana from I-10 to Tangerine Road. According to PAG, traffic volumes on El Camino de Mañana in this area reach approximately 500 Vpd. Access along El Camino de Mañana is unrestricted. El Camino de Mañana intersects with the I-10 westbound frontage road in an unlighted unsignalized “T”-intersection with stop-control on the El Camino de Mañana approach. El Camino de Mañana crosses the UPRR at-grade just east of its intersection with the I-10 westbound frontage road. El Camino de Mañana and Linda Vista Boulevard intersect in an unlighted unsignalized “T”-intersection with stop-control on the Linda Vista Boulevard approach. Linda Vista Boulevard from El Camino de Mañana to Thornydale Road is classified as a collector roadway by the Town of Marana. Linda Vista Boulevard west of Hartman Lane is under the jurisdiction of the Town of Marana while Linda Vista Boulevard east of Hartman Lane is under the jurisdiction of Pima County; however, Linda Vista Boulevard is maintained by Pima County through an intergovernmental agreement. West of Camino de Oeste, Linda Vista Boulevard provides one travel lane in each direction with no bike lanes, curb, gutter, or sidewalks. East of Camino de Oeste, Linda Vista Boulevard provides one travel lane in each direction with intermittent shared use lanes, curb, gutter, and sidewalks. The posted speed limit is 45 mph. Access along the roadway varies from unrestricted in the western portion to restricted in the eastern portion. According to PAG, traffic volumes on Linda Vista Boulevard vary from 400 Vpd near El Camino de Mañana to 7,700 Vpd near Thornydale Road. Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 1-5 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Introduction October 2005 Other Modes of Transportation The only continuous pedestrian and bicycle facilities (sidewalks 5 to 6 feet in width and paved shoulders of 6 to 8 feet in width) within the area are found along Twin Peaks Road from Silverbell Road to its eastern terminus. According to the PAG Tucson Bike Map, Twin Peaks Road from Silverbell Road to Coachline Road is designated as a Bike Route, while the roadway from Coachline Road to its eastern terminus is not designated. R17-3- 407 of the Arizona Administrative Code prohibits bicycle use of I-10 in the vicinity of the Twin Peaks Road TI. Trails within the area are currently under design or construction. The Santa Cruz River Shared Use Path is under construction and will be a paved trail for bicycle and pedestrian use that will connect with other community trails and bikeways, facilitating nonmotorized access throughout the community and adjacent natural areas. This trail will follow the high flow channel of the Santa Cruz River and will cross Twin Peaks Road. The Marana segment of the De Anza National Historic Trail is under design and will follow and interpret the route of the 1775 De Anza expedition to San Francisco, California. This trail will be unpaved and suitable for equestrian use. The De Anza Trail will follow a circuitous route just outside the low flow channel of the Santa Cruz River and will connect with other equestrian trails that provide connections with nearby public open space and natural areas. Public transportation within the Town of Marana is provided by Sun Tran, the fixed bus route transit provider for the City of Tucson, and Pima County Rural Transit, the transit provider for unincorporated Pima County. Neither Sun Tran nor Pima County Rural Transit currently provides service stops in the vicinity of the Twin Peaks Road TI. A Greyhound Bus Lines station is located on Sandario Road near the Marana TI, approximately 8 miles north of the Twin Peaks Road TI Amtrak, which provides long distance intercity passenger rail service, passes through the Town of Marana. The only Amtrak station in Pima County is located at the Union Pacific Depot in downtown Tucson. The 1994 ADOT State Rail Plan Update identifies a future opportunity for providing a regional rail passenger system, which includes service between Tucson and Phoenix along I-10. The Union Pacific Transportation Company provides freight rail service along I-10 for the central and southern portions of the state. The UPRR line runs parallel to and east of I-10 in the vicinity of the Twin Peaks Road TI. Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 1-6 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 20 and 21: AVRA VALLEY RD MARANA I-10 SCENIC D
Page 24 and 25: Project Purpose and Need October 20
Page 34 and 35: Alternatives October 2005 CHAPTER 3
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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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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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