I just took a soil sample. Basically I used a bulb digger(?) to get the soil out. It went in a good 6" which if I remember right was the right depth, took multiple samples, mixed all the dirt together and then poured it in a tupperware container to take to the local extension office. Is there a better/easier way to do this? I don't think customers would like big holes all over their yard, this was in a bed so they probably never noticed.