EL DORADO, Arkansas — On the east side of this small town, tucked away not far from the Louisiana border, sit two massive incinerators with a surprising link to a landmark environmental law in California.It’s a place where old paint, leftover pesticides, seized cocaine, recalled hairspray, expired pharmaceuticals and many other hazardous chemicals come to die — the detritus of a society in which toxic substances are woven into daily life.A place [...]