Abstract: A modular dock system (10) having a plurality of interconnected dock modules (12), each module having a rectangular frame with means (62) for supporting a metal grate (34) around its periphery, a drain pan (60) suspended from the frame beneath the grate, and an angular leg (24) at each corner of the frame, the modules being joined by vertically spaced bolts (64) interconnecting the abutting legs of adjacent modules. The system preferably includes a secondary containment system (14) having flow lines that gather spillage or leakage from the drain pan (60) of each module. A modular dock bumper assembly (16) is also disclosed for use with the modular dock system (10).