>> reporter: cal osha says it has inspected general contractor john stone moyer and subcontractor largo concrete 11 times over the last five years. it issued john stone moyer six general citations, with low penalties over four of those inspections. whereas four of largo's 11 inspections were accident-related. three resulted in violations for workplace safety hazards, including one serious violation for failing to guard reinforced steel which could have resulted in a worker being impaled. in oakland, melanie woodrow, abc7 news. >> there were some loud moments outside an oakland courtroom today as the man who protested president trump was a rained on assault charges. these were supporters of the president who confronted the lawyer for eric cramp ton, the former diablo valley professor pleaded not guilty today. he faces four felony assault charges for this incident you see. it happened during an april rally in bergly. he hit four people with a bike lock. >> i think there are lots of issues in this case, including identification and what, in fact, occurred. >> he also faces a misdemeanor ch

that's a company called john stone moyer. so they'll be looked at. it's largo that right now is the key focus. these investigations can take three or four months. often if they find violations the companies are cited, they have to be fixed and it goes on their records. it's going to be a throng process. right now the ball is in cal osha's court to find out why this accident happened and how it could be prevented and if the companies did anything wrong leading to the accident, if they didn't follow all the work rules. safety procedures weren't followed. they'll be looking at all that. it'll take a few months. >> certainly a lengthy investigation. no doubt about it. rob roth live in oakland, appreciate that part of the story. of course you can stay with ktvu and ktvu.com for continuing coverage on today's partial building collapse in oakland. you also, as always, can follow us on twitter and facebook for those updates, including more information about potential road closures that still may exist in that part of oakland throughout the day today. >>> in