Let's not invite conspiradroids in to launch rampant speculation, but....
I doubt those are shots from a construction worker. More likely the personal archive copies of a professional photographer. Those pics are probably in some government file somewhere. This is the work of one or more professional photographers. They're not leisure snaps by a casual worker, because they're:
> From all over the cleanup site
> Some taken from elevated positions that would've required special permission.
> There are more than a hundred shots per day from the first few days from all sorts of locations. No construction guy had the time to set up and shoot a hundred shots.
> Look at the last pics of 06 October. The sun is coming up. The following pics are from early morning on the 7th. No one worker hung out there for 24 hours shifts.
> The framing and angles look like those of a seasoned photographer.
I'd say maybe an agency camera from one of the city or state government offices nearby. Photographer 1 took it out for one shift and someone else followed up later. Someone probably burned themselves copies for their own use, or took copies home to work on. All likely very innocent, but I wanted to beat PDOH's socks to noticing it.
ETA: Brainfart. I just remembered the type of company I've dealt with that kept a "company camera". Insurance companies. Surveyors often keep an Everybody's Camera around in case they have to go out on an ad hoc job and don't want to wait for the pros(or don't want to call in the pros).
Might've been someone doing a claims file. 
