I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Alternatives October 2005 and sidewalks would be 6 feet in width. Along the segment of Linda Vista Boulevard proposed for reconstruction, 6-foot wide paved shoulders could be used by bicycles, but sidewalks would not be provided. All sidewalks and proposed intersection improvements would provide crosswalks, sidewalk, and ramps that are compliant with the Americans with Disabilities Act (ADA) and resultant regulations. The proposed project would provide pedestrian and bicycle connections between the existing sidewalk and shared use lanes on Twin Peaks Road and the Santa Cruz River Shared Use Path and the Juan Bautista de Anza Historic Trail east of Continental Ranch. The Santa Cruz River Shared Use Path is under final design currently and will be completed prior to the construction of the proposed improvements to Twin Peaks Road. As a result, reconstruction of the path at its intersection with Twin Peaks Road would be required. At-grade shared use path crossings of Twin Peaks Road were not recommended because of potential vehicle conflicts; therefore, users of the shared use path would be diverted along the Twin Peaks Road embankment approximately 850 feet east of the shared use path’s alignment. In this location, both the Santa Cruz River Shared Use Path and the proposed Juan Bautista de Anza Historic Trail would cross Twin Peaks Road beneath the proposed Santa Cruz River Bridges. The connection to the Santa Cruz River Shared Use Path is illustrated in Figure 3-18. Figure 3-18. Proposed Twin Peaks Road Connection to Santa Cruz Shared Use Path To discourage pedestrian crossing of Twin Peaks Road at the former alignment of the Santa Cruz River Shared Use Path, the roadway’s center median would be fenced for approximately 100 feet in length. This would direct path users to either cross under the Santa Cruz River Bridge or at the nearest intersection to the west (Twin Peaks Road and Clover Road). During public information meetings on the Twin Peaks Road TI, the public expressed concerns regarding the safety of children attending Twin Peaks Elementary School (7995 West Twin Peaks Road). As a result, the Town of Marana chose Twin Peaks Elementary School as their initial Safe Routes to School program. A successful grant application Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 3-21 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Alternatives October 2005 would result in the construction of a 4,500-foot long, 14-foot wide shared use path along the south side of Twin Peaks Road from Silverbell Road to Coachline Boulevard and along Coachline Boulevard from Twin Peaks Road to Desert Spirits Drive (approximately 725 feet south of Twin Peaks Road). Although the Twin Peaks Road TI project does not provide funding for this shared use path, the social, economic, and environmental effects of this path are addressed within this document to increase the probability of the grant application’s success. Proposed Drainage Improvements Drainage issues in the study area were documented in the Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista Final Drainage Report, dated May 21, 2004. Although readers are referred to the Final Drainage Report for a more thorough discussion, the results of the analyses are summarized here. Roadway Drainage Pavement drainage from Twin Peaks Road is collected currently by curb and gutter and transmitted to storm drains along the outsides of the roadway. Catch basins and storm drain pipe collect the drainage and transmit the water to drainage channels, which drain to tributaries of the Santa Cruz River. The western portion of Linda Vista Boulevard (near its intersection with El Camino de Mañana) and El Camino de Mañana have no curb and gutter and pavement drainage sheetflows off the roadway into small roadside ditches adjacent to the roadway. Proposed improvements to Twin Peaks Road would use curb and gutter to collect pavement drainage. Catch basins and storm drain pipe would collect the runoff and transmit the water to the nearest cross drainage channels, which would drain eventually to the Santa Cruz River. Where curbs are proposed for Linda Vista Boulevard and El Camino de Mañana (near the El Camino De Mañana/Linda Vista Boulevard intersection only) the method of drainage would be the same as that described for Twin Peaks Road. Beyond the reaches of the intersection, runoff would flow off the roadway into roadside ditches and to the nearest cross drainage facility. Due to the absence of curb and gutter, pavement drainage on the frontage roads is currently collected in roadside ditches and conveyed to existing cross culverts. Under proposed conditions, curb and gutter would be installed along portions of the frontage roads and a catch basin/storm drain system would be used to collect flows and convey them to the nearest cross drainage facility. In addition, median drainage would also be intercepted by the storm drain system for conveyance to the nearest cross drainage facility. Cross Culvert Design Drainage facilities under I-10 and the frontage roads were developed assuming the 50year storm event in accordance with ADOT design criteria. The design considered existing box capacities and outfall angles in relation to receiving channels. In general, where existing facilities are proposed to be augmented, the existing culvert sizes were duplicated for the new culvert cell. Where feasible, larger cells were proposed to increase capacity and decrease the number of additional cells required for augmentation. The Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 3-22 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
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Interstate 10 Traffic Interchange a
Page 4 and 5: 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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