Warehouse Sanitation - 1st Shift, West Mifflin, Pennsylvania (PA), Full Time, 1st Shift, Core-Mark, a Performance Food Group Company, is part of a Fortune 150 company that continues to grow as an industry leader in fresh and broad-line solutions to the convenience retail industry. The warehouse performs general janitorial, cleaning, and sanitation-related job tasks in the warehouse facility, including dry, cooler, and freezer areas.