>> However they do show the Virginia State P.D. on this freq., but list the location as Richmond.
"Richmond" is the location for the licensee - the Commonwealth of Va., not the frequency location.
The frequency is licensed to be used on a site in the Jefferson National Forest (Brumley Mtn) in Washington County, near Abingdon and I-81.
Even though the frequency is part of a trunked site, Jake, you might have been montioring a phone interconnect conversation (not to be confused with a private line call). Interconnect calls link a radio user to someone using a traditional wired or wireless phone. The calls can be setup to link via specific frequencies assigned to the site, and can also be programmed to maintain the call on the specific frequency for the duration of the call.
152.540 is a valid frequency, and so is 152.5475 MHz. The Va. RR database shows three sites listed as using 152.5475. I originally thought you might have been hearing adjacent frequency comms off of one of those three sites, as the STARS system is still not licensed for narrow-band F.M. modulation.
Unfortunately, the FCC ULS database shows no current or past licenses covering 152.5475 in Va., and the RR site info for the STARS sites listed in the database is missing any license details.
It would be kind of ironic if 152.540 was being used for a STARS phone interconnect frequency. Before cellular, that frequency was one of the outbound channels used in the day of radio phones. There are still some companies offering radiophone service ... often in rural areas still untouched by cellular service.