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Pressure-treated wood is advertised as a long life (some say 40 plus years) with direct ground contact. Manufacturers suck the timber into chemicals that penetrate the surface. The most vulnerable area is where the wood is cut. All such purposes require local treatment if they are to be buried. My experience is that this usually usually lasts a long time. I have some fence posts, I put in 20 years ago, which I then dug up. All these were still as good as the day I put them in the ground. On the other hand, I have found a couple of times pressure-treated wood underneath the deck, even posts that rest on the bridges, where the wood had decayed. As with all life, this shows that there is design, the plan, the odds and sometimes something that does not appear as expected. It is out of the "norm".
Pressure-treated wood, and how to handle it, is not well defined by the Washington state (where I work) wood that destroys organism laws. The wood is made for ground contact, so it is not specifically a defect to have it on the ground. At one point I asked the WSDA about this problem and was told this. Fact: Pressurized wood in contact with the soil will be much longer if all ground contact is eliminated. An inspector should, if possible, examine all pressure-treated timber that has a ground contact and, if it is decomposed, so call it that way. If no disintegration is evident, an inspector, to help the customer, can say that grading the earth back from the timber, or putting it on a concrete bridge, does it longer. This advice may or may not make sense depending on the design element of the design, say a tire.
Personally, as an inspector, here is what I do. If I see pressurized timber in a crucial role, and it is in contact with the earth, I call out to grade or remove the earth. For example, I call it a problem when I find pressure-treated timber in the ground and it is used as a post under the house or on a deck of any height. In the important role you do not want to take the chances of rot, the result of the contact between wood and soil and moisture that leads to the wood.
On the other hand, if I inspect a house and find a pair of 4x4s, to support a railing, sunk into the ground, at each side of the steps from a modest porch or deck, I control the timber at ground level and, if that is good, I don't say much. No rating is applicable, by post submerged and it seems to be good. In my opinion, simple and non-critical outdoor uses, such as fence posts, are common and on the road, the repair is easy to do and the area is easy to access. The repair can be done by a worker who is affordable and no structural damage is likely to occur.