Workers stacking heavy boxes and driving forklifts in the dark.

Thick black dust that causes nosebleeds and vomiting.

Broken hand carts that give workers the choice between carrying heavy boxes by hand or struggling with carts so slow that they could be fired for not meeting strict piecework quotas.

Emergency exits blocked by stacks of boxes and pallets.

Workers stuck in stifling trailers for up to 30 minutes after heavy loaded pallets are stacked in front of the doors.

Filthy bathrooms and water fountains, and no time to fill up water bottles while working in 95-degree temperatures.

These are among the conditions documented at an Eastvale, California Walmart warehouse and outlined in a formal complaint filed with the California Department of Occupational Safety and Health on July 18 by the group Warehouse Workers United (WWU).