I-10 Twin Peaks Traffic Interchange, Environmental Assessment
I-10 Twin Peaks Traffic Interchange, Environmental Assessment
I-10 Twin Peaks Traffic Interchange, Environmental Assessment
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Affected Environment and <strong>Environmental</strong> Impacts October 2005<br />
controlled by the formal planning processes, zoning regulations, land use codes<br />
and regulations, and other land use controls of the Town of Marana and Pima<br />
County. As a result, it is reasonable to assume that these developments would<br />
comply with these regulations and ordinances and reflect the overall development<br />
patterns approved by the Town of Marana and Pima County. Because the<br />
developments would comply with land use regulations, the infrastructure needed to<br />
supply this growth (i.e. water supply, sewer and/or other utilities) would be<br />
provided also.<br />
Air Quality<br />
Pima County and the State of Arizona have programs in place to address<br />
particulate matter and CO. Because Pima County is classified as attainment under<br />
a limited maintenance plan for CO, the County must meet the conformity provisions<br />
of the federal Clean Air Act and subsequent amendments. As a result, all<br />
transportation projects that appear in the RTP are analyzed and the preferred<br />
alternative, along with past, present, and reasonably foreseeable future<br />
transportation projects have been demonstrated to not contribute to a CO<br />
nonattainment designation. Likewise, regulatory controls in Pima County are likely<br />
to protect the County from reaching nonattainment for particulate matter despite<br />
future development.<br />
As the area develops, sources of volatile organic compounds and oxides of nitrogen<br />
would be added to the area (gasoline stations, vehicles, lawnmowers, etc.); therefore,<br />
it is likely that the airshed’s ground level ozone levels would increase. Recent local<br />
data from PAG indicate that the Tucson region experiences ozone levels<br />
approaching the 8-hour federal standard. It is likely that ozone levels would<br />
continue to increase and additional control measures may be required to keep the<br />
area in attainment of the standard.<br />
Threatened and Endangered Species and Natural Resources<br />
As discussed in the Biological Resources section (page 4-25), the analysis<br />
conducted for the preferred alternative determined that the proposed action may<br />
affect, but is not likely to adversely affect the CFPO or its habitat due to the<br />
project design and mitigation measures that would be implemented as a part of this<br />
project. Although the listing of the owl as an endangered species is under review<br />
by the courts, the protections afforded the owl are still in place. If the owl is<br />
delisted, it is anticipated that one or more of three major conservation efforts<br />
proposed by the Town of Marana and Pima County would be in place and<br />
protection to the owl would be continued. These efforts are: 1) Pima County’s<br />
SDCP; 2) the Town of Marana’s Habitat Conservation Plan; and, 3) the Town of<br />
Marana’s Bajada <strong>Environmental</strong> Resource Overlay District. All of these programs<br />
are designed to preserve appropriate CFPO habitat and provide contiguous<br />
corridors between quality habitat areas, while allowing limited development to<br />
occur in areas deemed less desirable for the CFPO. Other animal species,<br />
vegetation, and natural surface features would benefit also from these efforts.<br />
Interstate <strong>10</strong> <strong>Traffic</strong> <strong>Interchange</strong> at<br />
<strong>Twin</strong> <strong>Peaks</strong>/Linda Vista<br />
4-<strong>10</strong>3<br />
Project No.: NH-0<strong>10</strong>-D (AIW)<br />
TRACS No.: <strong>10</strong> PM 236 H5838 01D