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approved lubricant/sealant to the entire length of the spline and insert a spline into the slot . If necessary to firmly seat the spline against the bottom of the slot, the weir operator may drive it into position by placing a short length of 4x4 with a matching mortise over the spline and striking the 4x4 with a hammer until lubricant extrudes from the joint on both sides of the spline. To prevent deformation of the spline, the operator should not directly strike the spline under any circumstance. The operator then must align the slot of the board to be added with the spline just inserted, and apply pressure to the added board until its bottom face seats firmly against the upper face of the board below . Again, to preserve a smooth mating surface, the operator must not strike the weir board directly with the hammer, but rather must first place the short section of 4x4 on the board being added and then strike that section. With the added weir board seated firmly against the board below, the final step in adding each weir board requires that the weir operator secure the board in position as follows : 1 . If necessary to force the downstream face of the added board firmly against the flange extension, temporarily drive a wooden shim between the inner surface of the upstream I- beam channel flange and the plywood that temporarily diverts the flow. 2 . Working from the downstream (inner) side of the flange, drill a pilot hole through the flange into the added board . The holes through the extension should then be enlarged such that the lag screw that will attach the weir boards to the flange extension will not bind in the hole . 3 . Insert a minimum 34n . lag screw through the extension hole, and drive it fully into the pilot hole in the weir board until the screw head seats against the extension and draws the downstream face of the weir board tightly against the flange extension. 4. After ensuring the added board remains firmly in position, remove the temporary plywood that had been blocking the flow (and , if used, the additional shims) . 5 . Proceed to the next weir stack, continuing the process until all three weir stacks are set at the same, higher elevation. 2 . 3 . 2 . 2 Weir Board Removal Following the completion of dredging, the contractor must begin decanting the ponded water within the basin by gradually removing the weir boards . Section 3 .4 describes the decanting process. However, in removing the individual boards, the contractor must follow the procedures outlined below . - 10 .