Lessee...
...subsoil temps less than 50F... (check!)
....design frost-depth of 48"... (check!)
...concrete partition intersects exterior foundation wall with no exterior insulation... (check!)
Nope, no insulation needed here!
Compared to Cave Creek AZ with ~70F deep subsoil temp, and a 100-year design frost depth of 3" that NEEDs no frost-heave considerations on how deep the foundation footings need to be...