Size the trench so there's enough room for the retaining wall block and at least 8 in. of space behind it. Excavate deep enough to completely bury at least one full course, including space for 6 to 8 ...

Once you have done your tests, reviewed them and decided which ratio of sand to clay to use then you are going to be ready to apply them to your wall. Try to make enough mixture to at least finish a ...