There is a popular trail in my area.  It is so popular that 55 miles of the trail is paved.  It is for walking and biking only.
 
One section of the trail passes directly behind a police shooting range.  I have found numerous bullets laying on the trail.  I am very surprised that they would not put more distance or more dirt between the trail and the shooting range.
 
The bullets I find are laying on the trail and are quite mangled.  Once you look at my measurements and calculations below, you will see that the bullets would have to have hit quite a bit of matter and become quite mangled to be slowed down enough to land on the trail.
 

 

 
But what about the bullets which I have never found which are off in the weeds on the other side of the trail?  Any bullets which had enough velocity to fly over the trail must have hit less matter, be slowed down less, be less mangled, and had to have flown at that higher velocity.  Below, I did the calculations for speeds of bullets landing on the trail versus passing 6 feet over the trail.  I had to assume that the bullets had no upwards or downwards momentum (not shot down on the trail from an officer above and not deflected downwards either) and that the reason for the bullet falling was purely due to speed of the bullet versus speed of gravity which occurred due to lost speed when passing through an object at the ridge of the mound.  The severity of the numbers would be much worse if taking into account the possibility of deflection.
 
By my calculations, a bullet landing at your feet could be traveling as slow as 71 feet per second versus a bullet flying by your head which could be traveling as fast as 182 feet per second.  Again, this is assuming that the path of the bullet is purely due to velocity versus gravity with no care given to the possibility of vertical momentum caused by aim or deflection.  A bullet could whiz by your head at a much higher speed if it was deflected downwards towards you.
 

 
What do you think?  It kind of freaks me out every time I walk by.  It seems that the dirt mound could have at least been made more than 8 feet tall.

 
Yeah if you're finding bullet fragments, I'd notify the council.. no big deal to reinforce the berm a bit higher and thicker.
 

Thanks for the responses guys! I didn't know if it was really an issue or if I was just being paranoid. I will contact someone in city council.

Additionally, please feel free to prove my math wrong if you are interested. It has been quite a few years since I took a physics math class. Falling object physics and pythagorean theorem... hmm.

The fact that they are making it there, doesn't look so good. I would think the city or whoever owns the land would want to address it, since it is a public area. I'm impressed your city/county has that big of a paved area for the public to exercise.

Maybe just a friendly call to the local PD, ask who maintains / manages the range. 
 
Share your concerns and findings and ask, if they are aware of fragments on / near the public trail. 
 
Do they know about the public trail being so close ?
 
Do they fly a red flag while the range is hot ?  Can it be seen from the trail at a safe distance ?

You are a rude person, aren't you? I wasn't trying to point out your mistake to make fun of you; I was pointing it out because I was unsure what you were trying to say. It's hard for me to have a conversation with you if I can't understand you. And it's hard get clarification if I don't point out what is confusing in your message.

.......

My guess is it'll all land on deaf ears until someone is injured. They'll only see it as creating a problem for them to solve without a budget in place to do so.

Do NOT send any bullet fragments to your city council. This could be easily misinterpreted and you may have a swat team knocking on your door.