I-10 Twin Peaks Traffic Interchange, Environmental Assessment

Affected Environment and Environmental Impacts October 2005
from the UPRR; therefore, no use of the 4(f) property would occur. The temporary
impacts to the use of the facility would be minimized by the UPRR’s right-of-way
grants or agreements process.
The only Section 4(f) resource that would be incorporated into the preferred
alternative is the Santa Cruz River Shared Use Path. Approximately 500 feet of the
Santa Cruz Shared Use Path, which is less than one percent of the path’s total
length, would be incorporated into the preferred alternative. The Town of Marana
Parks and Recreation Department, who manages the Santa Cruz River Shared Use
Path in this area, concurred with the determination that there is no feasible and
prudent alternative to the use of the portion of the path and that the preferred
alternative includes all possible planning to minimize harm resulting from such
use.
Utilities and Railroad
Existing Conditions
There are a number of utilities within the study area. The most conspicuous of
these utilities are 90-foot tall towers that support three sets of 138 kv TEP
transmission lines. These towers are parallel to and approximately 150 feet east of
the UPRR. Other overhead utilities include electric service lines owned by TEP
and by Trico Electric.
The Union Pacific Transportation Company provides freight rail service along I-10
for the central and southern portions of the state. The UPRR line runs parallel to
and east of I-10 in the vicinity of the Twin Peaks Road TI. There is a heavy
concentration of underground utilities within the 200-foot R/W of the UPRR.
Known utilities include three high-pressure petroleum lines (6-, 8-, and 12-inch
lines belonging to Kinder Morgan) and numerous fiber optic communications lines
on both sides of the tracks (belonging to Sprint Communications, Qwest, MCI
Communications, Williams Communications, Level 3 Communications, AT&T
Communications, and UPRR’s internal communication facilities). AT&T also has
service lines on the west side of I-10 within the study area.
Other underground utilities include natural gas and water lines which serve
Continental Ranch and the commercial area west of I-10, that are owned by
Southwest Gas and Tucson Water, respectively. Tucson Water’s well # Y004
(7201 W. Twin Peaks Road) is located approximately 50 yards north of Twin
Peaks Road. Pima County Wastewater Management serves the Continental Ranch
area where a sanitary sewer lift station pumps sewage east of the Santa Cruz River
for treatment at the Ina Road Wastewater Treatment Plant; however, sewage in the
commercial area west of I-10 is treated by on-site individual septic systems.
Continental Ranch is served also by buried television cable lines belonging to
Comcast Cable.
The CMID operates two wells within the project area which transmit flow under
I-10. The CMID operates an open irrigation canal along the east side of I-10,
Interstate 10 Traffic Interchange at
Twin Peaks/Linda Vista
4-97
Project No.: NH-010-D (AIW)
TRACS No.: 10 PM 236 H5838 01D