HEWLETT-PACKARD (620-640 PAGE MILL ROAD)
PALO ALTO, CA
Health & Environment
On this page:
What Are the Risks at the Site?
The chemicals that remain in soil and groundwater due to the former operations at the HP Site and nearby sites are chlorinated volatile organic compounds (VOCs), primarily trichloroethene (TCE).
Prior to the start of the environmental cleanup activities in the 1980s, potential health risks included risks from direct contact with affected soil or groundwater, accidental ingestion of affected soil or groundwater, and inhalation of chemical vapors. However, the ongoing cleanup activities have addressed these health risks and testing has shown that there are no complete exposure pathways associated with the Site.
Groundwater in the Palo Alto area currently is not used for drinking water. Drinking water in Palo Alto is supplied to homes and businesses from municipal sources including the Hetch Hetchy reservoir in the Sierra Nevada Mountains. For the sake of setting cleanup standards, it was assumed that the groundwater in the area may be a potential future drinking water source. Therefore cleanup standards protective of drinking water have been established.
Recent vapor intrusion testing results have shown elevated levels of TCE vapors in some subgrade structures (elevator shafts, underground parking garages). However, the testing has showed that there are no unacceptable accumulations of vapors in homes or workspaces.
EPA uses performance measures to track environmental results at Superfund sites. If you have any questions or concerns about the measures at this site, please contact the site team members listed under Site Contacts.
Read more about Superfund Remedial Performance Measures.
|Status at this
|What does this mean?|
|Human Exposure Under Control||Yes||Yes means assessments indicate that across the entire site:
No means an unsafe level of contamination has been detected at the site and a reasonable expectation exists that people could be exposed.Insufficient data means that, due to uncertainty regarding exposures, one cannot draw conclusions as to whether human exposures are controlled, typically because:
|Groundwater Migration Under Control||Insufficient Data||
Yes means EPA reviewed all information on known and reasonably expected groundwater contamination. EPA concluded the migration of contaminated groundwater is stabilized and there is no unacceptable discharge to surface water. EPA will conduct monitoring to confirm that affected groundwater remains in the original area of contamination.
No means EPA has reviewed all information on known and reasonably expected groundwater contamination, and the migration of contaminated groundwater is not stabilized.
Insufficient data means that due to uncertainty regarding contaminated groundwater migration, EPA cannot draw conclusions as to whether the migration of contaminated groundwater is stabilized.
Yes means the physical construction of the cleanup is complete for the entire site.
No means either physical construction is not complete or actions are still needed to address contamination.
|Sitewide Ready for Anticipated Use||Yes||Yes means:
No means that one or more of these three criteria have not been met. However, a site listed as no may still have redevelopment occurring on portions of the site and may be eligible for additional redevelopment.