I-10 Twin Peaks Traffic Interchange, Environmental Assessment

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Wall to Protect Rec. ID Affected Environment and Environmental Impacts October 2005 Total Units (Benefited) Table 4-8. Noise Mitigation Evaluation Summary 2030 Unmiti -gated Noise Level (dBA) 2030 Mitigated Noise Level (dBA) Barrier Insertion Loss (dBA) Barrier Dimensions Barrier Segment Costs Approximate Length (feet) Height (feet) Total Cost ($20-25 /square foot) Cost per Benefited Receiver NR26 3 60 54 6 309 20 $154,500 $51,500 NR26A 59 53 6 NR27 58 53 5 RS27 12 60 55 5 802 17 $340,850 $28,404 RS27A 58 53 5 RS28 58 52 6 RS28A 56 51 5 RS28B 56 51 5 RS28C 56 51 5 RS29 55 50 5 RS29A 55 50 5 RS29B 54 49 5 RS29C 55 49 6 RS29D 55 48 7 RS29E 53 48 5 RS30 52 48 4 RS25 2 61 56 5 111 6.5 $14,430 $7,215 RS26 64 59 5 LVR1 1 67 Single isolated receiver – no barrier recommended LVR5 1 66 Single isolated receiver – no barrier recommended LVR7 1 65 Single isolated receiver – no barrier recommended LVR8 2 65 60 5 256 10 $51,200 $25,600 LVR9 7 65 60 5 48 11.5 LVR10 67 65 2 500 12 $131,040 $18,720 LVR11 6 67 62 5 773 5.5 $85,030 $14,172 LVR12 69 62 7 LVR13 1 64 Single isolated receiver – no barrier recommended Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-62 Project No.: NH-010-D (AIW) TRACS No.: 10 PM 236 H5838 01D
Wall to Protect Rec. ID Affected Environment and Environmental Impacts October 2005 Total Units (Benefited) Table 4-8. Noise Mitigation Evaluation Summary 2030 Unmiti -gated Noise Level (dBA) 2030 Mitigated Noise Level (dBA) Barrier Insertion Loss (dBA) Barrier Dimensions Barrier Segment Costs Approximate Length (feet) Height (feet) Total Cost ($20-25 /square foot) Cost per Benefited Receiver LVR14 5 64 59 5 463 10 $92,600 $18,520 LVR15 64 59 5 LVR16 1 64 Single isolated receiver – no barrier recommended LVR21 1 67 Single isolated receiver – no barrier recommended Note: Recommended walls are indicated by bolding Conclusion Figures 4-4a through 4-4d illustrate locations where walls would be constructed to protect impacted receivers. Although 49 of the 126 receiver locations were predicted to meet criteria for consideration of noise mitigation in the 2030 build condition, 11 of these locations were commercial properties; therefore, noise mitigation for these 11 properties was not considered. Noise barrier walls were analyzed in 13 locations to protect impacted residences. Of these locations, 6 walls would protect single isolated residences and would not be constructed per ADOT policy. One wall would protect three residences at a cost of $51,500 per residence; therefore, this wall was determined to not meet ADOT’s cost per benefited receiver criterion and was not recommended. Six locations were recommended for the construction of noise abatement walls. These six walls would protect a total of 34 residences and would meet ADOT’s cost per benefited receiver criterion. Although the Town intends to construct these walls as described above, the final decision would be made following the public hearing process and discussions with affected property owners. The design parameters of these walls would be determined during final project design. In addition to mitigation using noise walls, resurfacing Twin Peaks Road west to Silverbell Road with RAC is proposed also. This treatment would improve drivability of the roadway and decrease the noise generation from the tire-pavement interface. Although the FHWA would not participate in the funding of roadway resurfacing with RAC, the Town of Marana would fund this overlay. Hazardous Materials It is important to locate sites of soil or groundwater contamination before performing construction activities. These contaminated properties could pose a physical danger to construction crews or be liabilities if construction causes contamination to migrate. To determine the potential of soil or groundwater Interstate 10 Traffic Interchange at Twin Peaks/Linda Vista 4-63 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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Mitigation Measures October 2005
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Introduction October 2005 CHAPTER 1
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AVRA VALLEY RD MARANA I-10 SCENIC D
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Introduction October 2005 Cortaro R
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Project Purpose and Need October 20
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Alternatives October 2005 CHAPTER 3
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Avra Valley Rd. Twin Peaks Rd. Silv
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Affected Environment and Environmen
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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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