Gypsum Calc Epsom .6 2.4 .8 .9 3.5 1.2
Based on boiling 14.90 gallonsliters at 1.041 for 90 minutes, this will decrease your wort by 1.50 gallonsliters, bringing your after boil OG to 1.045. You wanted an OG of 1.048. It looks like it will be under.