"Larry Dighera" wrote:

3/4 of a mile is the minimum visibility for the ILS Rwy 28R approach
with RAIL or ALS out. So the approach/landing may have been just
within compliance with FARs at the time.

According to the NTSB prelim, the pilot had cancelled IFR and was proceeding
to the airport under VFR. Square that with 3/4 of a mile.