Hi - I have a customer who has traditional mulched beds (MANY - like 8 large ones - with shrubs, perennials in them) in his yard. He wants me to remove the mulch and change over to stone (river rock or something like it). I'm in the process of bidding this job and wondered if anyone had any useful suggestions? Should I remove all the mulch or just lay fabric and add the stone? Any advice on bidding this properly would be appreciated too.