I-10 Twin Peaks Traffic Interchange, Environmental Assessment

Affected Environment and Environmental Impacts October 2005
The study area is a mix of land uses. The study area contains vacant, residential,
commercial, public and institutional, and parks and open space land uses. The land
uses planned within the study area exhibit a major loss of vacant land. Vacant land
is replaced primarily by low density residential and master planned developments,
corridor commerce, and conservation/mitigation land uses.
Impacts
No Build Alternative
The no build alternative would not affect the existing rights-of-way or easements,
or result in land acquisitions within the project area.
Preferred Alternative
The preferred alternative would acquire additional right-of-way (R/W) for
roadway improvements and construction of the Twin Peaks Road TI and would
acquire additional drainage easements. The proposed improvements would be in
accordance with the Town of Marana and Pima County general plans.
The preferred alternative would acquire a total of 72.4 acres of private and state or
federal property for needed R/W. The proposed acquisitions are presented by
proposed use of the property, number of acres by ownership type, and number of
parcels affected in the following table.
Proposed Use
Extension of Twin Peaks
Road
Reconstruction of eastbound
I-10 frontage road
Table 4-1. Proposed Property Acquisitions
State or
Federal
Property
(acres)
Number of
Affected State
or Federal
Parcels
Private
Property
(acres)
Number of
Affected
Private
Parcels
15.7 6 28.1 12
0.7 1 12.1 6
Proposed access road 5.8 6 10.0 5
In addition to the R/W for roadways, a number of new drainage easements would
be required for the preferred alternative. These supplemental drainage easements
would total 8.5 acres, and are detailed below. The channels and drainage structures
are illustrated in Figure 3-19 in Chapter 3, Alternatives.
Partial parcel acquisition could result in unusable or undesirable parcel sizes. For
example, parcels could be created that may not meet minimum regulatory lot size
requirements for septic tanks and/or private wells or may result in parcels that
become undesirable for current uses. During individual property R/W negotiations,
the effects of partial property takes would be considered.
Interstate 10 Traffic Interchange at
Twin Peaks/Linda Vista
4-3
Project No.: NH-010-D (AIW)
TRACS No.: 10 PM 236 H5838 01D