(case involves allegations of violations of animal waste disposal permits and the NPDES permit requirements; trial court erred in finding that defendants engaged in land application of manure when weather forecast contained greater than 50 percent chance of precipitation within 24 hours after completion; state failed to establish greater than 50 percent chance of precipitation and no expert testimony utilized to explain whether excessive manure application and snow melt was likely to have caused the runoff; case remanded for reconsideration of correct amount of civil penalties).