Over the years I have read numerous reports of water contamination from feedlot excrement holding ponds. This does not have to be, there is old technology the the Local Farm Bureaus have had available for safe conversion of animal waste into liquid methane that can be used for drying crops, running equipment, and heating work buildings and animal shelters. The processed animal by product after the methane removal, is dry granulated fertilizer that can be applied to the land and not burn the crops.
I use to do this when working on Mr. Petersen's Farm in the 1950's. It ran his tractors, cooked his food, dried his crops. The only electricity on his farm was the 6 volt battery for the radio in the Milking Barn, to listen to Farm Market Reports while milking the dairy cows.
There is no reason for these toxic holding tanks and reservoirs. It is not the expensive to setup or operate. The savings from recycling this waste is money in the bank, and is just one way of cutting down on our dependency on foreign oil! ~Parnelli
PS: Methane can be converted into "Natural Gas"!