He reports success in picking full cases to pallet jack in a union shop. Chris and his team implemented this entirely on their own.
All picking is from pallets stored on the floor.
Originally each of the 4-6 workers walked through all the aisles, picked cases, and built a pallet for a customer. Switching to bucket brigades allowed Wawa to use narrow aisles without congestion because there is no passing under bucket brigades. Narrow aisles also freed up space for two additional aisles. The empty pallet jack is waiting for worker 1 to start a new order. Empty pallets are stacked nearby.