Mexican Imperial Stout

Step 1:Main batch, and coffee stout
Brew 10 bbl to 28 Plato with this recipe.
Send 4 bbl to FV.
~28 P x 5 bbl wort / 14 P = 10 bbl total BK volume
-> 10 bbl total BK - 5 bbl wort = 5 bbl H2O for target of 14 P
If OG 14 P drops to FG 5 P => 4.88% ABV

Later in the day, after sending the high gravity batch to FV for Imperial Stout, I will boil and transfer another 5 bbl of water to this FV, in order to drop gravity and make a low gravity coffee stout.

Step 2: Imperial Stout
Leave 5 bbl in BK. Add H2O to refill 110 bbl.
28 P x 5 bbl / 10 bbl = 14 P
Adding 100 lbs Dextrose => 14P -> 17.5 with approximate ABV 8%.

Bring to boil and add a second 100 lbs Dextrose.
Send 10 bbl to FV and pitch yeast.
This will be Imperial Stout.

Step 3: Finishing the coffee stout
Clean BK.
Add 5.5 bbl H2O and bring to boil.
Add 30 lb bag of coffee from Logan House and step appropriate amount of time.
KO and send to the first FV, containing the first KO of 5bbl high gravity stout.