I did a front walk for a lady, 12 X 4. I did everything according to the ICPI specs. I needed two lifts to bring the base to graded, about 6", two 3" lifts though on my second lift after compaction the base was soft. the materiel was a 0 - 3/4 shale which was very wet when it went down. Now it seem OK to walk on, solid, is this something that is common when using shale product, should worry about the next time it rains? Do I need to redo all the work that was done, or can I leave it for done?