I know from reading the FAQ's that my 10 different heirloom plant's seeds will be cross pollinated from the other 30 hybrids near-by if I raise them from seed next year.

Not sure why you came to that conclusion. Since tomatoes self-pollinate, the odds of any of them crossing is less than 5%. That is established. So the vast majority of the seeds from the OP tomatoes will breed true.

You'll find many prior discussions here on 'cross pollination'.

Dave

My question is will a cross pollinted 2009 heirloom tomato be part heirloom and part of the first plant to pollenate it or will it be part of many?

****

I agree with Dave's answer above.

If a blossom is completely self pollenized, which happens the majority of the time, then the seeds will come true.

Only if there are unfertilized ovules in the tomato ovary due to incomplete pollenization can another variety possibly cross pollinate that blossom.

Which should answer your question above.

Carolyn