I-10 Twin Peaks Traffic Interchange, Environmental Assessment

Affected Environment and Environmental Impacts October 2005
The highest increases (14 dBA, 9 dBA, and 8 dBA at LVR1, LVR2, and LVR3,
respectively) were the result of the relatively large increase in traffic volumes in
the western segment of Linda Vista Boulevard. Currently, Linda Vista Boulevard
in this area experiences total traffic volumes of approximately 60 vehicles per hour
during the peak traffic period. With the completion of the Twin Peaks Road TI,
traffic volumes in this area are expected to increase to approximately 980 vehicles
per hour during the peak traffic period. The highest increase (14 dBA) was
predicted at LVR1, a residence near the proposed new intersection of Twin Peaks
Road/El Camino de Mañana/Linda Vista Boulevard. In addition to the increase in
traffic volumes, the intersection would be relocated closer to this residence with
the proposed improvements.
As Linda Vista Boulevard moves east of Hartman Lane (represented by receivers
LVR4-LVR26), single family housing is located near the roadway. Although noise
levels were predicted to increase in this area, the increases were considerably less
than those near the interstate. Noise levels along Linda Vista Boulevard east of
Hartman Lane were predicted to increase by 2 dBA to 4 dBA. However, because
of their proximity to the roadway, this relatively moderate increase in traffic noise
levels caused a number of receivers (LVR7 – LVR10, LVR13-16, and LVR21) to
approach or exceed the NAC.
Mitigation
Mitigation of Temporary Impacts
Land uses in the project vicinity would be exposed to noise from construction
activity under the preferred alternative. To minimize noise impacts from
construction activities, the contractor shall control construction noise 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). This may include:
• All exhaust systems on equipment would be in good working order.
Properly designed engine enclosures and intake silencers would be used
where appropriate.
• Equipment would be maintained on a regular basis.
• New equipment would be subject to new product emission standards.
Stationary equipment would be located as far away from sensitive receivers
as possible.
Mitigation of Permanent Impacts
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 receivers
(Receivers I10F1-I10F11) were commercial properties near I-10. It is ADOT’s
policy that abatement is not considered reasonable for impacted businesses;
therefore, noise mitigation for these 11 receivers was not considered.
Interstate 10 Traffic Interchange at
Twin Peaks/Linda Vista
4-57
Project No.: NH-010-D (AIW)
TRACS No.: 10 PM 236 H5838 01D