I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Affected Environment and Environmental Impacts October 2005 connectivity within the area would not be improved; therefore, increased use of less polluting alternative transportation modes would not be expected. The 1990 Clean Air Act Amendments require transportation projects to conform to (be consistent with) air quality implementation plans. To be a conforming project, it must be part of an approved transportation plan and transportation improvement program. The Twin Peaks Road TI is part of the approved 2025 Regional Transportation Plan and 2005-2009 Transportation Improvement Program. As a result, the no build alternative would not be consistent with the approved transportation plan and program and no benefits to regional air quality would occur. Preferred Alternative The proposed project is located within an area that is in attainment for all criteria pollutants except PM10. The project is within the boundaries of the Rillito Planning Area, which has been designated by EPA as a moderate nonattainment area for PM10. However, compliance with Pima County’s NEAP, ADOT standard specifications for dust suppression during construction, and a SWPPP would comply with the Rillito Planning Area SIP. Construction-related soil disturbance and operation of heavy equipment would produce an increase in particulate matter during roadway construction, but these impacts would be short-term in nature and mitigated as described below. The Twin Peaks Road TI is part of the approved 2025 Regional Transportation Plan and 2005-2009 Transportation Improvement Program. The proposed project is located within the TAPA in Pima County. This project is in an area that complies with the NAAQS for CO and would have no negative effects on CO levels in the area. The project involves construction of a new TI with I-10 and associated improvements, which would reduce roadway congestion and associated CO emissions. Pursuant to 40 CFR 93.116, this project is in conformity. Mitigation Prior to initiating any construction activities, such as earthmoving, trenching, or road construction, the contractor would apply for and be granted an activity permit from the PDEQ and a grading permit from the Town of Marana. The contractor would monitor dust generation from the construction area and limit the amount of dust generated to a maximum opacity of 20 percent. The contractor would follow ADOT standard specifications for dust suppression during construction and shall comply with the SWPPP prepared for this project. During construction, the contractor would control, reduce, remove, or prevent air pollution in all its forms, including air contaminants, in the performance of the contractor’s work in accordance with Arizona Department of Transportation’s Standard Specifications for Road and Bridge Construction, Section 104.08 Prevention of Air and Noise Pollution (2000 Edition). Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-48 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Affected Environment and Environmental Impacts October 2005 Conclusion As a result of these mitigation measures, the proposed project would have only temporary, short-term, and minimal impacts to particulate levels during project construction. The project would decrease traffic congestion in the study area, which would improve overall air quality. Pedestrian and bicycle facility connectivity within the area would be improved; therefore, an increased use of less polluting alternative transportation modes would be expected. Noise ADOT’s Noise Abatement Policy(NAP) for Federal Aid Projects (March 21, 2000) defines a traffic noise impact as: • When the predicted level approaches or exceeds the FHWA’s NAC. ADOT defines “approach” as being within 3 dBA of the appropriate NAC. Under this policy, residential impacts would occur when the future Leq(h) value is 64 dBA or greater; or, • When the predicted level substantially increases over existing noise levels. “Substantial” is defined as an increase of 15 dBA or higher. Existing Conditions The complete results of the traffic noise analyses are presented in the document Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista Final Traffic Noise Analysis Report, dated September, 2004. Readers are referred to this report for the detailed findings; however, the results are summarized below. Traffic Noise Monitoring Existing traffic noise conditions were assessed using traffic noise monitoring. Field monitoring of traffic noise during peak traffic periods was conducted on December 4, December 16, and December 17, 2003. Monitoring occurred between approximately 7:00 AM and 8:00 AM and between 4:00 PM and 6:00 PM. Noise levels were measured at seven locations near roadways in the study area using an integrating sound level meter. The field monitoring results are presented in Table 4-7. Measured noise levels ranged from 55 dBA near Twin Peaks Elementary School to 73 dBA west of the I- 10 Frontage Road at Linda Vista Boulevard. As expected, the highest noise readings were near I-10. Traffic Noise Modeling Computer modeling of traffic noise can be utilized at a greater number of locations along a corridor than noise monitoring, modeling can be adjusted to replicate highest traffic volumes and other parameters, and modeling can be used to assist in traffic noise mitigation design. For these reasons, noise impacts resulting from existing roadway traffic were analyzed using STAMINA/Optima 2.0 (STAMINA). Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-49 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
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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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