I want to say something else about our soil. Our ground is very hard and notoriously difficult to dig in. Most perps do not try to bury the bodies of their victims. Every so often, you'll hear about a body, or remains, being found on an oil lease. That's because the killer drove out on a dirt road, then an oil lease road (will explain more about that in a minute) to dispose of the body where it won't be found for many months, or most probably, many years.
If you look at Google maps in the area of where there are many oil wells in west Texas, you'll see all these little lines going to small circles. Those are oil lease roads leading to a particular oil well, which has a pump jack on top of it. Most of them are out in the middle of nowhere. Just about the only person who drives those roads with any frequency is the pumper. If the well isn't performing to it's potential, sometimes, the company who owns it will have a pulling unit sent out to do a workover on the well. Other than that, very few lease roads get much traffic. A person could drive out on a lease road, but not right up to the well, and dump a body ANYWHERE on the property behind a mesquite bush, and no one would ever see it for a long time. It is only by chance that most of those remains are ever recovered. I'm sure there are some victims lying on lease properties right now that have yet to be found.
The point I'm trying to get across is that if you want to dispose of a body in west Texas, all you have to do is drive out of town and down a oil lease road, then place it anywhere you like (as long as it is some distance away from the pump jack). You don't have to worry about burying it anywhere in soil or in water. No one is going to find it for a long time because no one comes that way very often. So to me, that speaks volumes about the mindset of Hailey's killer. They went to a spot they knew about, and were familiar with, in order to hide her remains.
But, if that is so, they would also know what you just said. Dumping a body in an area where it would be more likely to be found doesn't make sense if they wanted to hide it.