Still haven't gotten a backhoe out to dig test holes, but thought I would post some photos of what I have. First is two sample jars, the one on the left was soil from only three feet deep, the right from the side of the creek bank.

The shallow soil appears to be ~20% clay after 48 hours. In the week since it has settled to look like 10%. I placed about 6" loose soil into a bucket with 5 1/4" holes. Packed it down to about 3" by hand. Filled the bucket and all the water ran out in about 12 hours. Then I tamped the bucket onto a concrete floor and refilled it. Lost about 1/2" in 12 hours and slowed to a stop about 2.5" loss in a week. I was unable to find a defined procedure for this test.

The right jar has nearly 100% clay dug from the side of the ditch to be dammed. Was quite interesting how the mud line vs clear water line was very defined as it settled. Water is pretty clear.

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