Universal Portland Cement Co., C. W. Boynton · Universal Portland Cement Co. · leaf 21
grade is firm and solid, there is no ne-cessity for further preparation, but if it contains any soft or spongyplaces, these should be removed and the holes filled with firmmaterial and packed solidly. When the sub-grade occurs on fillsits preparation requires more care and it is not strange… … Figure 9. Figures 8 and 9 show plainly the necessity of providing a proper fill andthen preserving it. In this case the fill was of sand, and was scarcely widerthan the walk. Not being properly protected, it was rapidly destroyed. Atone point the walk was undermined nearly a third of its width.…
