No idea who the loads are for, but looking at the cars along side, probably food stuffs.
That yard is a nice example of a modern team yard. There is even an auger type conveyor in one corner of the yard for trans-loading from covered hoppers to trucks.
As for location, Dogbert is correct, sort of hard to correlate the location with the hand drawn maps. Taking an educated guess, perhaps between track 7 & 8 on the Emery map. Live local or Google maps might be of better use.
Lots of building materials, probably for the local building spurt and a lot of tank cars hauling food grade liquids (corn syrup, oils, etc)
Hope this place lasts beyond the building boom. Maybe the MTA will sell the air rights here too.........