From 1974-1985, Synertek, Inc., leased the area directly uphill from where the Santa Clara Square Apartments currently stand. Synertek manufactured semiconductors, crucial to the production of microchips for computers and other technologies. The manufacturing involved highly toxic chemicals, and several tanks stored underground on site leaked VOCs into the groundwater, contaminating the soil around the area. In 1987, the area was deemed a Superfund site by the Environmental Protection Agency. In spite of this, or the VOCs known to be on site of the SCSA property, the DTSC did not make VOCs a part of their remediation plan for the apartments
This 2006 site report does not show the pollution extending under the apartment site, but who knows.
https://documents.geotracker.waterboards.ca.gov/regulators/d...