Repairing Clay-Fortified Areas Quiz Please sign up for the course before taking this quiz. When shaving down high spots during the repair of clay wear:1 use a sharpened iron rake. crosscut your raking pattern. use the existing grade around the patch to judge when the patch is at the proper grade. All of the above. Which size tamp will give you the maximum pounds per square inch (psi) of pressure when tamping?1 6 x 6 tamp. 8 x 8 tamp. 8 x 10 tamp. 10 x 10 tamp. Pre-moistened clay is preferred in clay repair because:1 it adheres to the existing clay in the repair area better than dry clay. it binds together very easily. it makes the field easier to chalk over. Both A & B. To insure proper binding of new clay with existing clay in a repair area, be sure to:1 mix existing soil and topdressing with the new clay. sweep all loose soil and contamination out of the wear holes. further excavate the wear areas. Both A & C.