I am a mech engineer, building a home with 1500 ft lane in from the blacktop over mostly sandy but also clay and silty soil. I have an area on the lane that is soft and spongy and allows the dump truck to sink down and make big ruts. I had already planned to use some Propex separation fabric(200ST) but certain areas are so bad I can stand on them and they act list a tarp laying on water-- almost! Digging down I find clay on top covering a deposit of saturated and mushy sand. I can dig down with my bare hand and remove huge handfulls of the wet snotty sand with little effort, and deeply. There is about 100 yards of lane with this problem. Please offer ideas for remediation. thanks!
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