1) The latticework of rebar on the rectangular mound of soil is probably a preassembly to another structure. The clue is what it is sitting on. There is no reason to believe that the pad is capable of supporting a structure without compaction, etc, and the side walls of the pad would be encased in retaining walls. Don't be surprised if a concrete wall is poured over the rebar than lifted out with a crane. This is called "tilt up construction," a very common form of commercial construction.
2) The "horse troughs" are concrete wash outs. After a concrete truck dispenses its load, it needs to quickly have the chute washed out to prevent concrete from caking to it. Since it is illegal to simply wash concrete out onto bare earth, the horse troughs contain the slurry until they are either emptied by a service or carted off and replaced. Concrete will be mixed at a "batch plant" (probably offsite) and loaded into concrete trucks for delivery.
3) The diminishing mound of soil is probably a "borrow pile." The objective on any project is not to import or export fill soil. So, as excavations occur, soil is piled onto a "stock pile." The soil is then removed as needed elsewhere.
4) Concrete pathways will probably be installed toward the end of construction. That way, if heavy equipment needs to cross the path, it will not damage the walkway. The walkways usually go in about the same time as landscaping.
5) When working from scratch, it is much better to install piping and wiring in acessable conduits so that it can be repaired and updated as required.
6) The tall, swooping, articulated crane like equipment are concrete pumps used to reach over a structure or hole.
Bear
(a landscape architect)
[email protected]