Now, a span of 8 weeks seems to give a whole lot of room for error, and I'm sure that September here in Sacramento is not going to be the same weather-wise as September in New York or even in San Francisco.
-So how do I know when the grass is "breaking dormancy" and when it is "preparing for dormancy"? Should I wait for certain temps to come as a signal for the correct time?
-Can I do the first application in the fall or do I have to wait until next spring?
-Should I really only do 1 application every ~6 months?

Now I also have in mind to RESEED COME FALL. How can I reseed in the areas overrun by bermudagrass?
-Do I hit the area with Ornamec and then reseed some time later?
-Should I use ROUNDUP as an initial application just on the areas mainly containing bermuda and wait for spring to use Ornamec? When/How should I apply the roundup if that's a better course of action?
-If I use Roundup, should I rake away the dead top grass before I reseed or leave it to be reuptaken by the soil? Will the seed find its way down to the soil?

For reference, I'd say about 30% of the lawn has bermuda creeping in. And I suspect this occurred because our house was vacant for a year and a half. I have no idea how the grass got bermuda in it to begin with, as it is far from any neighboring lawn and has a border around it. But for these reasons, I don't suspect it coming back once I eradicate the existing problem.