The following codes appear to denote the locations where specific anomalies were found. Codes appear to apply to individuals, not species. We don't know if The Gully has a specific system for keeping track of species with multiple individuals.
The naming convention appears to be "AREAnumber", for example BRAM21
BELF - Belfountain
BOLT - Bolton
BRAM - Brampton
CHEL - Cheltenham
EAST - Caledon East
ETOB - Etobicoke
GORG - Georgetown
MONO - Mono Mills
NOBL - Nobleton
ORNG - Orangeville
PALG - Palgrave
SHOM - Schomberg