getting tires for construction

so I have some steep banks on the property that I would like to use tires for retaining walls on
so I go talk to my buddy at the tire store and he says that he'd be facing a nasty fine if he let me have a couple hundred cause the state (WA) is real particular about disposal I'm wondering if anyone has good information about how to release the shop owner from liability for this sort of thing in oregon or washington (I live real close to the border tween the two)

Tires decompose and leach toxins for many, many years- save your self the hassle and don't pollute your land.

Not sure if it would work, but what about the clean pallets that  many businesses collect in tottering heaps at their back doors waiting to be hauled away to the dump?? To be sure you would eventually end up with nails in the dirt, but if the bank is steep you aren't likely to be using it as a roadway anyway?  It might  be considered a sort of a hugelculture  endeavor in the end result?

Just don't get the pallets from China as they are likely to have been treated with any number of ugly chemicals. Anything other than something that looks like raw wood is generally recycled anyway.  A huge number of pallets are used once and then landfilled..it would be good if people found a use for them. If you are near a town of any size at all you will likely be able to find more than you would ever need..I use only clean sound ones as they are much nicer to handle and I don't see the point of fussing with broken ones while sound ones get sent to the dump.

One place I asked told me they would be grateful if I would use the pallets that they can't recycle; otherwise they have to pay to have someone haul them away.

I get non deposit pallets for free from the builders merchants. They usually load them on the back of my truck with a forklift too.   I just ask for some when I go there for a bag of cement or something.