Usually this time of year, they have special events that require sections of the parking lot to be sectioned off like that. More than likely, it's something along the lines of the practice area for a Cheerleading event at Axis Arena (has been set up like that before).
But you never know, the main lot is closer to the construction area than the employee lot, and has less curves to it. Only negative to storing pieces down there is the chance they go underwater in any flooding...