336 REPAIR OF CASA GRANDE RUIN Inn. ann, 15^ 



measuring 10 feet from the exterior walls of the building in every direc- 

 tion is also to be removed. This work is to be carried on in conjunction 

 with the under|)iiining of the walls, and is to be dependent upon the 

 ]>ro<;rcss of the latter, the work being done as reijuired by the i)erson 

 liolding the contract for the underpinning. All jiropcr precautions 

 must be observed during the i)rogrcss of tlie work to prevent any injury 

 to the building, the walls being pr()])erly braced and sup|)orted before 

 excavation is commenced. Tlie contiactor will be lield responsible for 

 any injury to the building. Any objects found of arcbeologic or other 

 value pi'operly 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 remo\ed to a proper distance, not less 

 than 100 yards from the building. Proper drainage cbannels must be 

 provided to keep the excavated area permanently clear of water. 



2. UNDERPINNING WALL.S 



The walls where eroded at the ground level are to be underpinned 

 with hard burned brick, laid in good cement mortar and extending to a 

 depth of at least 12 inches below the original ground level. This work 

 must be carried on gradually and very carefully in conjunction with the 

 clearing out of the debris. The uuder surfaces of the overhanging walls 

 must be carefully trimmed to aflbrd solid horizontal bearings against 

 the brickwork. The face of the brickwork is to be set back at least 1 

 inch and not more than 2 inches from the face of the wall, and the brick- 

 work is to be ])lastered with a coating of cement mortar, 1 to 2 inches 

 tldck, bringing it out flush with the outer wall. 



3. FILLING IN OPENINGS 



The broken-out lintels of oi)enings are to be replaced by wooden lin- 

 tels composed of squared lumber, 2 by 4 inches in size, laid side by side 

 across nearly the whole thickness of the walls, with not more than 1 

 inch space between tlie boards, and of the same length as the original 

 lintels. The broken-out walls are to be trimmed to afford solid resting 

 places for the new lintels, which are to occupy tlie same horizontal 

 jilanes that the old ones did. The openings above tlie lintels arc to be 

 filled in in the same manner as the iinderiiinning i)revioiisly described, 

 the under wall surfaces being carefully dressed to aflbrd solid horizontal 

 bearings, tlie l)rick work being set back 1 iiu'li from the wall surfaces 

 and plastered with a coating of cement mortar to bring it out flush with 

 the wall. 



I. BRACING 



One wooden brace and two iron braces are to be put in, as shown 

 upon the plan hereto annexed. The wooden brace is to be of one 

 piece, or of two pieces well bolted together, of selected lumber, free from 

 knots and other imperfections, squared, and measuring 6 by 8 inches in 



