I would program these sites:
Site 17 - 868.6250 - Henderson (NC), Polk (NC), northern Spartanburg Counties
Site 19 - 860.9375 - Spartanburg Co
Site 36 - 868.7000 - southern Spartanburg Co
Site 16 - 860.8125 - Laurens Co
Site 21 - 868.9000 - southern Laurens/northern Newberry Cos
Site 4 - 868.8000 - Newberry Co
Site 20 - 860.2625 - Lexington Co
Site 44 - 860.4875 - northern Richland Co
Site 30 - 860.3375 - Richland Co
Site 3 - 868.1500 - southern Lexington and Calhoun Cos
Site 23 - 868.9250 - Orangeburg Co
Site 11 - 868.7875 - southern Orangeburg and Dorchester Cos
Site 12 - 860.4625 - Dorchester Co
Site 52 - 868.1250 - Berkeley Co
Site 9 - 858.7125 - Charleston Co
Dispatch talkgroups for SCHP are:
Spartanburg - 21008
Laurens/Newberry - 7536
Lexington - 7024
Richland - 6896
Calhoun/Orangeburg - 30352
Dochester - 29968
Berkeley/Charleston - 29712
Tac channels (chit-chit among troopers) are the adjacent to the dispatch channels in the talkgroup list. SC DPS talkgroups for each troop are used by SHEP, or SCDOT Emergency responders, which help with traffic issues (stalled vehicles, accidents) on the interstates.
Sheriff's Offices in Spartanburg, Laurens, Lexington, Richland, Orangeburg, Dorchester, and Berkeley all use the same Palmetto 800 system, so you can consider programming those talkgroups as well. County EMS systems in the same counties (except Berkeley) also use the same system so consider programming those.
Hope that helps.