I like the idea of you creating your own "fill" material on the property.

Do you have AC electricity on the property? With your mild climate and some aeration, you could probably get by with some fairly shallow ponds (8-10' deep) if that is all of the room you get above the dolomite bedrock.

Is the bedrock porous and/or fractured? If it is a 100' thick layer of massive rock, then it might serve as the seal for your ponds. If it will not hold water, then you will need to excavate down to bedrock, and then compact a clay blanket over the dolomite.