A lot of La Cañadans dismissed the Altadena claims. Altadena, after all, is not La Cañada.
In 1999, the Agency for Toxic Substances and Disease Registry concluded that "because the past levels of human exposure to perchlorate are unknown...the site should be assigned to the Indeterminate Public Health Hazard category for potential past human exposures to perchlorate in drinking water." The agency also found that there was no apparent public health hazard for "past, present, and potential future human exposure to VOC-contaminated groundwater processed for drinking water and surface soils or soil gases." (Report, “Public Health Assessment Jet Propulsion Laboratory (NASA) Pasadena, Los Angeles County, California.”) The report did not address a five-year excavation of Devil's Gate.
The point here is not to bash JPL, but to note the legitimate concerns about the proposed five-year cleanup project. Common sense tells us that the soil that is removed is likely to be dangerous. The agency study agreed that children are more susceptible, but failed to record the presence of summer day camps.