I don't think a 30 acre pond is gonna have a devastatin effect on a 50,000 acre pond. espesciually when ya have as much water flowin thru it as the 4 rivers an numerous creeks put thru this pond. And if its heavy metals that are the worry, won't they be settlin out in the upper lake where the water first backs up? This area has filled up with silt over the last 60 yrs. Will the heavy metals settle thru this silt and become dormant? I know mercury is heavier than mud so this make sense to me.