I have a customer that i spoke to last year about laying some stone in his planting beds. He thinks he wants a medium sized stone maybe river rock He currently has mulch. Do i need to remove the mulch to lay the stone down? I am going to take some measurements but my supplier sells the stone by the tone. So how do i know how much to use? Also i know stone is hard, back breaking work. What do you guys charge? I have one guy who helps me for $8 an hour on other jobs but since stone is such hard labor i was thinking about paying him $10 Any help would be great.