[OutsiderFan]

Costello played for Santa Margarita in high school, a member of the Pac-5 that includes all the CIF Southern Section powerhouse programs, like:

St. John Bosco
Long Beach Poly
Mater Dei
Centennial
Serra
Oaks Christian
Servite
St. Bonaventure
Crespi

Just to name a few.  It's arguably the most competitive collection of football playing schools in the country.

[OutsiderFan]

Costello played for Santa Margarita in high school, a member of the Pac-5 that includes all the CIF Southern Section powerhouse programs, like:

St. John Bosco
Long Beach Poly
Mater Dei
Centennial
Serra
Oaks Christian
Servite
St. Bonaventure
Crespi

Just to name a few.  It's arguably the most competitive collection of football playing schools in the country.