@AerocatS2A
Does anyone know how accurate the FlightAware data is and where it actually comes from? The last two data points for the accident aircraft have very slow speeds of 109 and 85 knots. Although the altitude still reads as one or two hundred feet I'm wondering if the aircraft was actually on the ground at that point and was sliding to a stop, or if they were airborne and stalling, or if the data just isn't good enough to be drawing any conclusions from it at all.
As DaveReidUK said, the FA sources is the ADS-B transmission from the equipped aircraft. The source is likely to come from FR24. The source seems to be a feeder at, or near KOAK. The last speed recorded (85kt) from this source is the same that have been mentioned here and indicated by FA.
The last "good" position of the aircraft has been received at:
37.6123 -122.3595 with an altitude of 75ft and speed 113kt for-384 fpm. The position is reliable, but the other parameters are delayed ones because the a/c was on the ground at these coordinates. The previous ADS-B received transmission indicates a position at 37.5954 -122.319 (approx 3925m/2.12NM from 28L threshold) at 1100ft with 149kt and -1535fpm rod. The previous was received at 37.5726 -122.2652 at 9307m/5NM from THR with 2175ft/186kt/-1152fpm.
The very last position received of the a/c is not coherent because of the receiver/feeder software and/or FR24 server. Some software or setting allows a "projection" of the aircraft and the server may also react with some delays.
I think that the wreck is at 37.6135 -122.3646 from what I can see on various TV footage.