Hi, We are presently working on a paver patio approximately 20 L x 12 W and find ourselves hitting a wall a bit. I certainly do not claim to be an expert mason, but I do have a few years experience with masonry and the base material incorporated in the install. I am running into a bit of a unique situation on this job. 1) Site was excavated and dug down to virgin soil generally 8 inches below our grade everywhere the patio would sit. I do admit that even after 8 inches of excavation the ground was still a bit damp, but I figured this to be the result of starting excavation 2 days after some heavy rains and the machine was simply spreading surface water into the new ground floor as it traveled. 2) Put out 3 inch layer of what we call 57 stone which is generally similar to french drain style gravel surrounding a corrugated perf pipe. Tamped this is. Overall it doesn't get ultra firm, but certainly pretty tight. 3) Next we installed the 4 inch 8910 layer (crushed gravel base layer). Using a vibratory plate tamp we compacted this numerous times every 1-2 inches. 4) The crushed gravel layer was not getting firm and rock solid like it usually does, in fact it started getting almost spongy with every pass we made with the machine. So we left it overnight and almost magically it got a lot stronger so we attempted to use the plate compactor again and once again the crushed gravel started sponging and actually was beginning to sweat out moisture a bit but not enough to pump out. It appears we have some sub surface percolation occuring that is drawing up into the crushed layer with every pass we make. Oddly it firms back up pretty tight (not perfect, but certainly not bad) after removing the machine from it. Has anyone else ever found themselves in this situation where it seems the more actively you compact the worse off it becomes. Obviously I firmly believe in compaction, but at this point it almost seems to be hindering progress.