Foothills residents and visiting recreationists live with fire threats year-round and are accustomed to practicing safe outdoor behaviors.  Any potential development could draw more people from an urbanized environment, where the imminent threat of brushfires and wildfires is minimal.

Any potential development could lead to increased traffic on Chaney Trail, Loma Alta Drive, and on the major north-south routes from Pasadena to northern Altadena. The narrow and hilly roads will struggle to handle increased traffic volume.  This will not only affect these specific roads, but also create traffic impacts on the connecting east-west Loma Alta Drive and major north-south streets in Altadena, as well as connecting east-west streets (such as Altadena Drive). In northern Altadena, these roads are two-lane only, with numerous stop signs.

Any potential development could increase the risk of accidents involving vehicles, hikers, cyclists, and equestrian riders on Chaney Trail and Loma Alta Drive.  Chaney Trail is a narrow and hilly road, with blind spots, between Loma Alta Drive and the Millard Campground trailheads to the National Forest.

Any potential development in the Chaney Trail corridor significantly affect the surrounding environments and native wildlife and their migration routes.  The impacts are magnified by the fact that the development site is adjacent to a Significant Ecological Area and the Angeles National Forest/San Gabriel Mountains National Monument, a rural outdoor lighting zone, and a watershed that includes seasonal streams flowing to the Arroyo Seco.  A variety of owls, hawks, quail, bobcats, deer, gray foxes, and black bears are among the wildlife that could be disturbed in these chaparral wildlands.

Any potential development may generate significant noise and light pollution for the surrounding areas, including the neighborhoods, foothills, and the Angeles National Forest/San Gabriel Mountains National Monument.  The construction phase will create extensive noise pollution, and any permanent facilities could impact the environment.  Night illumination would significantly increase light pollution beyond levels associated with the current nursery.