Abstract: A two part, weight bearing shim adjustable in height. The shim comprises two generally triangular or wedge shaped members. A base member has a flat bottom surface and a stepped upper surface. A smaller member is placed in inverted relationship on the base member. The smaller member has a stepped lower surface cooperating with the stepped upper surface of the base member. The upper surface of the smaller member is parallel to the bottom surface of the base member after assembly. The base and smaller members are mutually keyed to prevent improper interfit during assembly. The base member has vertical voids or bores formed in its body. This construction promotes ability of the bottom surface to engage a rough or irregular environmental surface, and minimizes the amount of constituent material required for fabrication. Recycled plastic is a preferred constituent material.

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).