I've lived here for almost two years now, have been coming here most of my life to visit, and have never heard anyone call it Sacrapimento. Apparently, people do. If you Google "Sacrapimento", it treats it as a mistake first, but if you tell the search engine that's what you really mean, it finds 282 references. "Sacratomato" you get right away, with 36,000 references. It's just the more common nickname for the town.
The funny thing about KM's thought is that if Dr. Don had taken the KFRC calls to Sacratomato, everybody would have known what he was talking about. KFRC not only came in like a local in the glory days (before interference ate the AM dial and when world-class engineers like Phil Lerza, who knew how to maximize an audio chain, were in charge), but it showed up in the ratings fairly regularly. The big Top 40 battles were between KROY and KXOA/KNDE, but both of those stations nervously looked over their shoulder at KFRC, which was absolutely a factor...to the point of having a toll-free Sacramento request line.