Abstract: A support matrix especially adapted for use with a spill containment pan having a reservoir defined by upstanding walls having upper edges and a generally flat-bottomed wall includes a porous grate that bridges the reservoir, a connection between the grate and the upper edges of the upstanding walls, and support walls connected to the grate and depending therefrom, the support walls having portions that contact the flat-bottomed wall. The lower edges of the support walls may be provided with cut-out portions that permit fluid to flow from one side of the support walls to the other. The support matrix is modular in nature so that one or more can easily be inserted into and removed from the reservoir.