It looks to be from Pithecellobium dulce, Monkeypod Tree.

Hmmm...says the roots go far. So not in the back yard anywhere near the septic tank.

So I talked to the guy that owns the crushed monkeypod tree and told him the proper name and mentioned the size this tree can get. He questioned that as he said that tree has been there for 50 years perhaps and was only 15 feet or so. Do yo think there are smaller monkeypod varieties than that big Hawian one?

Likely due to different site and climate conditions. Unlike Florida (and San Diego) Hawaii is actually on a tropic, with mainland plantings of the same tropical species often not thriving to the same degree, growing as large. For instance friends measured a monkey pod in Honolulu one time that had an absolutely enormous crown spread - I want to say 300 ft. but I'm not 100% sure now. Or if that was a single measurement from one side to the other or the average crown spread (using two sets of measurements to get an averaged size representation).

It is actually native from northern Mexico to Colombia and Venezuela. It has been widely cultivated in the tropics and has naturalized in many areas. It can be variable. Typically it grows 20-30ft tall but can get 40-50ft. I would imagine that are forms of this that stay smaller. Years ago a variegated form was showing up in some nurseries. It was shrubby and only grew 6-8ft tall.