I've read on here to obtain 10 soil samples from my 1 acre pond from all over the pond and let them dry out for two days, then mix them up and send in two cups of the soil mix. What is the best way to obtain the soil from the pond bottom? Take some from the 1' to 5' with a post hole digger seems easy enough, just not sure about leaves and sludge build up affecting the sample? And not sure if I need to get the sample from the 12's depths? Or how to get that deep? Thanks from the newbie pond owner!