Related for Terumot 5:10

A seah of terumah that fell in less than one hundred [seahs of produce] and created a forbidden mixture of terumah and chullin, if [the one hundred seahs] were of untithed produce, we make it into terumah and tithes on behalf of another place, or we designate it as terumah of tithes that are in it. If it was of tithes from which terumah had not been taken, we make it into terumah and tithe on behalf of another place, or we designate it as terumah of tithes that are in it. And if it was of second tithe, we echange it for money in accordance with its value as terumah, not including the value terumah that is in them. If it was of new produce, he waits until Pesach comes and gives it to the Kohen.

A seah of orlah that fell into two hundred of chullin and he was aware of it, and afterwards another [seah of orlah] fell inside, behold, [the mixture] is permitted (less than that it is forbidden), [and thus it may continue] until the forbidden exceeds the permitted. [Note: The manuscripts lack "לפחות מכן הרי זו אסורה", "less than that it is forbidden," and the GR"A would delete it.]