I've been in the business a while. We have done dozens of major drain issues but this one I'm stumped. Worst part is its my back yard! I have a spring that bubbles out into a creek. No problem on that part but the rest of my yard stays nasty wet. So I got ticked and got my skidsteer and mini x and dug the creek deep as I could get and it's solid rock about 3 ft below water. Then I dug all the wet areas about 2-3' down. Put 6" perforated corrugated pipe and landscape fabric. Filled the area with gravel. 120 tons of number 4 gravel to be exact and top dressed with 40 tons base stone to drive on. I'm not worried about grass at this point, and the gravel has worked but it still floats or moves as I drive where it's sinking and mud from underneath is bleeding through. After this I decided to dig 6' deep. 12' wide 20' long I then filled it up with large chunks of concrete I had from a driveway demo, I walked them in as I set them. After 2 days I went back and it's large chunks of concrete with water everywhere. I then covered the concrete with dirt and started to work the dirt in. The concrete sunk probably 2 more ft as I drove on it. The Dirt turned to goo and I took the machine back to the shop and said screw it. Any thoughts? What has me irritated is what if it was a clients house. I'd have to walk away mid way through tail tucked contracting so,wine else to fix what I should be able to. If it helps the mud is a grey clay base that wiggles like jello. Never seen it before. It sticks to my bucket, clothes, boots, etc. Also on 3 different times I've stuck my skidsteer and or mini x where neither could get me out. Had to call a wrecker. Here is a pic of my mini x where it was on 100% dry ground but when I started to dig. Broke the crust and water came everywhere. I dropped my boom and shovel got off and watched it sink. It was eary feeling since my x only had 4 hrs Here is a pic of the main area where I had trees taken down cuss they where dieing because of water. Huge pines 100' tall 3' diameter. I probably Lost 4 of 11 so I had them all cut. All the dark wet ground is where the drain and gravel is. Its still to nasty for a 2wd truck to make it.