In a change of plans I have talked to a reputable dozer operator.I will obtain some clay from the back of my place and line the entire pond much cheaper than using bentonite..questions are: He will be using a dirt buggy to haul the dirt in..will that compact as good as a sheepsfoot roller?..also I have seen 2 types of sheepsfoot rollers..one you pull behind a tractor and the other is motorized..any difference in compaction capabilities?...One last question is that I will be cleaning the silted/washed in areas out...should I compact the bottom before I start adding the clay?? thanks for your input..