I just spent a huge amount of time with this ridiculous county. For some reason, they decided to waste millions of taxpayer dollars. They run numerous independent trunking systems. Public safety has two, as you found. Most of the traffic is on the analog system with some cross patched to the digital system. Don't get too caught up into it--last year Motorola was awarded a contract to replace both. It will probably be another two years until completion. Some amateur radio repeaters just got bumped from towers so they could install the new antennas...so work has already started. In the meantime, install both and listen away. The contract is for a Phase 2 capable system that will operate in Phase 1 to start.