The débris now filling up the interior is to be removed down to the
floor level, or the original ground level. The débris covering an area
measuring 10 feet from the exterior walls of the building in every
direction is also to be removed. This work is to be carried on in
conjunction with the underpinning of the walls, and is to be dependent
upon the progress of the latter, the work being done as required by the
person holding the contract for the underpinning. All proper precautions
must be observed during the progress of the work to prevent any injury
to the building, the walls being properly braced and supported before
excavation is commenced. The contractor will be held responsible for any
injury to the building. Any objects found of archeologic or other value
properly belong to the United States and must be deposited in the
National Museum. The material removed from the building and from the
area about it is to be removed to a proper distance, not less than 100
yards from the building. Proper drainage channels must be provided to
keep the excavated area permanently clear of water.