i was about to lay mulch down on one of my accounts and i noticed that there is a thick layer of rock's under about 1 inch of top soil. they are the orange / redish rock's. i forget exactly what they are called. i guess who ever last put the top soil down forgot to remove the rock's first i don't know what to do with this , im not looking forward to digging up rock's and no way in hell im doing it for $45 an hour ! anyway any help on an easy way to get these rock's up and should i charge a little more. like 60 or 70 an hour for this job ?