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I worked in one of the buildings built atop this HP site[1]. It had a big water pump in the parking lot treating the ground water.

The story went that the HP instruments used to detect the ground water pollution levels were first built at the very site.

[1] https://cumulis.epa.gov/supercpad/SiteProfiles/index.cfm?fus...

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what the essentially did in the 90s was to dig giant trenches around entire city block, way down to the impermeable clay layer ... then fill the trenches with a similar impermeable clay creating a giant block sized container which they are still now pumping water through to slowly clean out the polutants

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