On Monday April 17 just before noon, two men were working at one of the test wells on the Zeneca site. They were seen to lift something up and over the fence, and then were pumping either into or out of the well and either into or out of a black barrel sitting in a truck with an LFR (Levine Fricke) logo on the side. The pumping sound was audible from the Bay Trail, from which the photo was taken. Video was also done at this time. Note the only protective gear appears to be some small thin gloves one man is wearing, while the other feels carefree enough to put his hands into his pockets.
click the above image to see a zoomed back view, for location identification.