Laserfiche WebLink
I <br /> 2) Pilings are wrapped with a choker cable or chain that is attached at the top to a crane. I <br /> The crane pulls the piling directly upward, removing the piling from the sediment. <br /> C. Clamshell Removal I <br /> 1) Broken and damaged pilings that cannot be removed by either the vibratory hammer or <br /> direct pull may be removed with either a clamshell bucket or environmental clamshell. I <br /> 2) A clamshell is a hinged steel apparatus that operates like a set of steel jaws. The bucket <br /> is lowered from a crane and the jaws grasp the piling stub as the crane pulls up. <br /> 1 <br /> 3) The size of the clamshell bucket shall be minimized to reduce turbidity during piling <br /> removal. I <br /> 4) The clamshell bucket shall be emptied of material onto a contained area on the barge <br /> before it is lowered into the water. <br /> D. Cutting <br /> 1) Is required if the pile breaks at or near the existing substrate and cannot be removed by <br /> other methods. <br /> 2) If a pile is broken or breaks above the streambed during extraction, all of the methods I <br /> listed below should be used to cut the pile. <br /> a. The pile should be cut at the streambed. I <br /> BMP 2. WORK SURFACE AND CONTAINMENT I <br /> A. Work surface on upland staging area shall include a containment basin for all treated <br /> materials and any sediment removed during pulling. Creosote shall be prevented from re- <br /> entering the water. Uncontaminated water run-off can return to the waterway. <br /> I <br /> I <br /> I <br /> I <br /> I <br /> I <br /> 2 Updated 3/19/2013 <br /> I <br />