August
I saw drill the other day without seeing it operate. Just happened by yesterday with my still camera, which records video (but not HD), and got a look at what it's for.

There are some closer looks in the August Gallery.
The blocks that are being placed atop the concrete layer which was poured over the flashing on the lower level of the perimeter are all the same size, so some must be cut to fit. Anyone who has ever had to cut or bore into masonry will know that what this man is doing is not easy, or fun.
These images represent the majority of the regular camera locations I use. Stitched together, they might give you a sense of walking with me on my "rounds".
The water has been running for more than a week now, making for a hypnotic view. Keep watching ... you're getting sleepy ... keep watching ...