Picture_set_A-reference_question__7.pdf

Question #7: Drawing sheet/Detail: S‐103 and S‐303

Please provide all available information relative to previous demolition work performed on Monoliths

30‐33, including what methods were utilized to break existing concrete, the methods used to remove broken concrete from the project, and the dates this work was commenced and completed.

USACE work crews removed four existing monoliths, 30 through 33, over the weekend of May 21st 2017.

High flood waters at this time allowed a work barge to be floated in behind the guidewall on the landside. Two excavators with hammer heads were used to demolish the existing monoliths down to elevation 552.1 as indicated within the plans. A second work barge had a crane with a clam shell to pick up concrete debris and place on an adjoining barge for disposal off site. A third excavator with a bucket head supported the clam shell with concrete debris clean up.