I think Ranger230man hit the nail on the head. All the trucks i have hired for ponds come equiped with a spin on latch that hooks to the tailgate and box of the truck on each side. before you load the truck the driver will spin the latch pulling the tailgate very tight against the box and minimizing any leakage. I will take a picture of one on monday. I wouldnt recomend spreading the mud around the retention pond, if any slumps into the pond you could have the developer or township trying to back charge for cleaning the extra sediment from the pond.Ive seen this happen before.
Excavating, Grading, Demolition, Land Clearing, Custom Grinding Services, Storm water management, Erosion Control.