oa No INSTALLATION GUIDE FOR STRUCTURAL FOAM BASINS . Inspect all parts and material supplied by Jackal, Inc. to assure no shipping damage. . Excavate hole large enough to accommodate basin, back fill and inlet piping. . Add back fill material or concrete to bottom of hole. Ensure it is level, compacted, and smooth. Install basin in hole making sure it is level. . Carefully back fill with naturally rounded gravel or stone, larger than 3/8" and smaller than 3/4" diameter, around periphery of the basin.