Gypsum Calc Chloride Epsom CaSO4 CaCl2 MgSO4 0.1 0.8 1.2 0.1 1.0 1.5 15.4 GALLONS PRE SPARGE STOP AT 5.5 GALLONS
Based on boiling 13.70 gallonsliters at 1.045 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.048. You were planning on an OG of 1.048 so you are right on track. Nice job!