I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Alternatives October 2005 proposed culvert locations and sizes under I-10 are compared with the existing structures in Table 3-1. The structure locations are illustrated in Figure 3-19. Table 3-1. Existing and Proposed I-10 and Frontage Road Drainage Structures Location (approximate I-10 Milepost) 244.48 Type of Improvement Augmentation / Extension 244.81 Extension Existing Size and Structure Under Frontage Road 2 - 6-foot by 3foot cells RCBC 2- 8-foot by 3.5-foot cells RCBC Existing Size and Structure Under I-10 mainline 2 - 8-foot by 3foot cells RCBC 2- 8-foot by 3.5-foot cells RCBC 244.94 New Structure New - N/A New - N/A 245.16 Replacement 245.38 Replacement 245.87 Augmentation / Extension 3 - 8-foot by 4foot cells RCBC 3 - 5-foot by 2.5-foot cells RCBC 2 - 6-foot by 2.5-foot cells RCBC 3 - 8-foot by 3foot cells RCBC 2 - 8-foot by 3foot cells RCBC 2 - 8-foot by 3foot cells RCBC Proposed Size and Structures for both I-10 mainline and Frontage Road 7 - 8-foot by 3-foot cells RCBC No change – extend RCBC only 6 – 10-foot by 4foot cells RCBC 3 – 10-foot by 4foot cells RCBC 4 - 8-foot by 4-foot cells RCBC 15 - 8-foot by 4foot cells RCBC Cross drainage stormwater would be transmitted under Twin Peaks Road and Linda Vista Boulevard by a combination of reinforced concrete pipes (RCP) and reinforced concrete box culverts (RCBC). The sizes of these structures were developed assuming the 100year storm event in accordance with Pima County design criteria, because these drainage facilities are located outside ADOT right-of-way. The proposed culvert locations and sizes under Twin Peaks Road and Linda Vista Boulevard are shown in Table 3-2. The structure locations are illustrated in Figure 3-19. Table 3-2. Proposed Twin Peaks Road and Linda Vista Boulevard Drainage Structures Location (Distance and Direction from Twin Peaks Road/El Camino de Mañana/Linda Vista Boulevard Intersection) Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista Proposed Structure and Size 535 feet west 2 - 6-foot by 4-foot cells RCBC 400 feet east 1 – 8-foot by 4-foot cell RCBC 1,038 feet east 1 – 48-inch RCP 1,660 feet east 2 - 6-foot by 4-foot cells RCBC 2,595 feet east 2 - 36-inch RCP 3-23 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Alternatives October 2005 Channel Design After stormwater runoff is carried under the roadways in culverts or pipes, it would be transmitted to the Santa Cruz River in open channels. Because the existing outfall channels downstream of the I-10 mainline and eastbound frontage road are located outside ADOT right-of-way, they were designed in accordance with Pima County requirements to convey the 100-year rainfall event. These channels discharge into the Santa Cruz River through openings in the soil cement bank protection. The existing channels are undersized to convey 100-year rainfall events. As a result, the channels near I-10 would be either enlarged or replaced with larger structures. The location, structure, and size of these proposed improvements to drainage channels are compared to existing channels in Table 3-3. All proposed channels were designed to provide one foot of freeboard. The channel locations are illustrated in Figure 3-19. The proposed channel improvements would require widening existing discharge locations into the Santa Cruz River in two locations (the channel outfalls at approximate I-10 MPs require widening also. Flows would be slowed by grade control structures or similar means prior to discharging into the Santa Cruz River; therefore, energy dissipation structures within the Santa Cruz River channel would not be required. Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista Figure 3-19. Proposed Drainage Facilities Near I-10 3-24 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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Page 18 and 19: Introduction October 2005 CHAPTER 1
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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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