I've done lots of work on sediment control ponds , there is no way you can do it all with a mini ex and tracked skidsteer. The mud won't take form so building the islands isn't going to work. As soon as the pond fills back up your islands will just turn back into silt and slough back into the pond. Best way is get 2 6 inch pumps, pump it down and attack it with a 20 tonne ex. Working with silt is alot different then working with dry dirt. Charge the guy by the hour and make sure you have some swamp mats .
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