I-10 Twin Peaks Traffic Interchange, Environmental Assessment

Affected Environment and Environmental Impacts October 2005
The preferred alternative would acquire commercial property for needed R/W. The
commercial properties between I-10 and the access road dispose of liquid waste
through individual septic tanks and some have individual water supply wells. In
some areas, acquisitions of areas in which septic tanks are buried or wells are
located may be required. During R/W negotiations, as a part of final design, these
utilities would be located and relocations or avoidance may be required.
Mitigation
The preferred alternative would require the relocation or raising of the 138 kv TEP
transmission lines in the project area. Coordination with TEP has been ongoing
throughout the project and would continue throughout the design phase of the
project. The relocation or raising of the 138 kv transmission lines would be
coordinated closely with TEP.
While setting the proposed bridge deck over the UPRR, temporary impacts to train
traffic may occur; however, the Town of Marana would provide plans for UPRR
review to ensure that the preferred alternative met current UPRR standards for
bridge design and that the sequencing of construction minimized temporary
disruptions to train traffic.
During final design, potholing would be used to verify utility locations. Although
the major utilities would be avoided by the preferred alternative, some utilities
within the project area may require slight adjustments. Utility coordination would
be maintained throughout the course of the project and schedules for any utility
adjustments would be coordinated closely to minimize interruptions and
inconvenience to customers.
If asbestos-containing water lines are moved or replaced during the roadway
construction, the lines would be handled, transported, and disposed of in accordance
with approved federal, state, and county asbestos handling procedures. This would
include appropriate precautions to ensure that employees are not exposed to airborne
asbestos fibers and that fibers are not released into the atmosphere.
As a part of final design and R/W acquisition, the Town of Marana would establish
the locations of private wells and septic tanks would be established for acquired
properties and any necessary relocations would be coordinated with the property
owners.
The Town of Marana would coordinate with the CMID prior to any modifications
of the canal and construction would be coordinated so that the proposed
improvements would not interfere with the supply of irrigation water during critical
periods.
The Town of Marana would maintain utility coordination throughout the course of
the project and schedules for any utility adjustments would be coordinated closely
to minimize interruptions and inconvenience to customers. Utility clearances
obtained by the Town of Marana would be in accordance with ADOT requirements.
Interstate 10 Traffic Interchange at
Twin Peaks/Linda Vista
4-99
Project No.: NH-010-D (AIW)
TRACS No.: 10 PM 236 H5838 01D