Is this a realistic/accurate way to get soil bearing values.
Dig hole to desired pier depth. Put 6x6 in (1/4 of a sq. ft. in area). Fill hole. Load with 500 lbs dead weight and see what happens over a month as far as subsidence. Actually I will do this on two posts with 1000 lbs. so I can balance the weight on the posts.
At end of rainy season now...soil is saturated, seems to drain really well. We have about 4-8 inches more to come in the next month or so.
I don't think that will provide an accurate representation. too many factors over a period of a year to be able to extrapolate based on a one month load test. Dig your hole below frost line, line with gravel, insert post and be done with it!
Here: http://www.countryplans.com/foundation/index.html