Bayshore surveillance video from atop the Silver Spring parking structure shows crews from Winter Services Thursday piling snow onto the ramp.Moments later, a lower-level camera captures the collapse. Mounds of concrete crushed cars and trapped dozens of others. Somehow, not a single person was hurt in the devastation.Tuesday, WISN 12 News went to the West Allis business to find out who told crews to put the snow there.A salesperson greeted WISN 12 News at the door. Here is the exchange."Can we talk to you about what happened at Bayshore?" WISN 12 News' Hillary Mintz asked."Are we filming right now?" the employee asked.The salesperson at the door wouldn't let WISN 12 News talk to a supervisor and wouldn't answer questions about the collapse at Bayshore.But WISN 12 News has learned the company's general practice is to follow customer directions which is the common way of doing business in the snowplow industry."That's the worst spot you could have placed it. It's the only area that has zero support," James Hoffmann, with The MCR Group, told WISN 12 News Tuesday.His company was the previous snow removal contractor for Bayshore. Hoffmann says they never piled snow in one spot."We would place it along all the exterior walls, specifically this side because we would have to dump it and haul it off," Hoffmann said.Hoffmann said they do take customer directives to an extent, but also rely on expertise to use their best judgement especially when it comes to upper-level parking structures.He said weight is a huge factor when considering where to pile snow and given the aftermath Hoffmann can point to only one explanation."Negligence, it's fault of a little bit of everybody, contractors should have known better because if they didn't know how to plow a structure they should have found out. Bayshore should have been on top of it, and said 'Hey, you're piling it in the wrong location,'" Hoffmann said.WISN 12 News asked Bayshore for their snow removal plans and if they told Winter Services to pile the snow in one spot on the ramp. The Texas-based owner has not replied to that question.WISN 12 News knows Bayshore has brought in a private engineering firm to determine if anything else structurally failed.This week, crews said they would be installing a temporary ramp to remove vehicles trapped on the second and third floors. No one was hurt in the collapse.