open fermentation in 10 gallon clear plastic bucket racked to 15 gallon glass demi john.
Based on boiling 10.45 gallonsliters at 1.034 for 60 minutes, this will decrease your wort by 1.00 gallonsliters, bringing your after boil OG to 1.037. You wanted an OG of 1.038. It looks like it will be under.