The rules on things like this vary between England, Wales and Scotland so us English have to be careful not to give bum advice.

Is the tip legal? Might be worth checking the pollution inventory on the Scottsih Environmental Protection Agency's website (http://www.sepa.org.uk/). Unfortunately you'll need the postcode of the site (or somewhere near!) to able to get info on the tip. I know how the English equivalent works but not SEPA's.

If the tip isn't in the inventory is doesn't necessarily mean it's illegal as there are exemptions from the law. might be worth checking with the planners - I would be surprised if there was a planning condition that said "trash the stone circle" - but hey funnier things have happened.

Hope this helps in some way.

Cheers

G