Hello,
I brewed an IPA at a Brew on Premise a few weeks ago. they helped me with the recipe for a 15 gallon batch:
i believe we started with 17 gallons of water, and used:
1.75 lbs of Caramunich
8.0 quarts of Super Light Liquid Malt Extract
1.5 quarts of Amber Liquid Malt Extract...