I spent couple days in Baltimore and Washington area in July and earlier this week. I can confirm Site 21 is another simulcast cell for Howard, Anne Arundel and Baltimore for this system,
BEE00.1C7
RFSS 1
Site 21
NAC 1C1
858.7875 Primary Control
856.8625 Secondary Control
859.9125 Secondary Control
860.8625 Secondary Control
BEE00.1C7-1.21 neighbor: Site BEE00.1C7-1.20; CC=0-1757 861.9875
BEE00.1C7-1.21 neighbor: Site BEE00.1C7-1.52; CC=0-1705 861.6625
Most active talkgroups are:
1010
1014
1074
1306
1318
Unfortunately they are all encrypted as well.
I'll be making a submission to the database