2011-12-03 Why is Barclay's arena contractors using neighborhood as a staging area with potential hazardous materials?

What appears to be highly explosive propane cylinders in back of arena contractor’s pickup truck parked across from a 171 unit residential building, if they are propane cylinders, then why is there a need to bring commercial hazardous materials like highly explosive propane cylinders unnecessarily within a residential neighborhood footprint?
http://www.youtube.com/watch?v=sSlZJyJTAh0
Why aren’t the Barclay's arena contractors using the official staging area on Pacific St between Vanderbilt Ave & Carlton Ave or why are they not in the confines of the arena footprint? If these are propane cylinders; why are they leaving them unattended in a residential neighborhood in the back of a tarp covered pickup truck that anyone could steal? This makes an "attractive nuisance" for children & thieves.
00:00 pickup truck from Wolkow - Braker Roofing Corp arrives to unload materials for arena work
03:51 white van from Wolkow - Braker Roofing Corp arrives to unload materials for arena work
07:25 arena contractor dumps unknown white power substance into the street
08:21 it appears that several unsecured highly explosive propane cylinders not strapped in the back of pickup truck with any apparent required commercial hazardous material placards/marking on truck
09:38 pedestrian walks by
09:52 unloads what appears to the average untrained person to be highly explosive propane cylinder
http://www.youtube.com/watch?v=trR93UJLRhI
contractors use residential neighborhood as staging area
http://www.youtube.com/watch?v=lL8yeP97oWQ
contractors use residential neighborhood as staging area
http://www.youtube.com/watch?v=B1qTwrlf8fU
Arena contractors entering into arena
 
Contractor:
Wolkow - Braker Roofing Corp
105 Apollo ST
Brooklyn, NY 11127
(718) 384-3456