In a large bowl, combine the flours, water 1 (420 grams) at the correct temperature, and all of the levain. (See water temperature explanation in above post and in below notes.) Mix just until the flour is fully absorbed by the water and levain. Cover with plastic wrap and allow to rest for 1 hour.
Sprinkle the salt over the top and drizzle the remaining water 2 (20 grams) over the top. Dimple the salt and water in with your hands, using a clawing motion, until fully combined.
Knead the dough in the bowl, folding the dough and using your fist to punch it into the rest of the dough, constantly rotating the bowl, until the dough is not very sticky and uniform. If it is sticky, keep your hands lightly wet while kneading. Cover and allow to rest for 30 minutes.
Pour the olive oil over the top of the dough. Fold the dough up over itself. Use a clawing motion and knead the dough in the bowl until the olive oil is fully incorporated and the dough appears smooth and stretchy.
Bulk ferment for 3 hours, during which time do three sets of four folds after the 1 hour, 2 hour, and 3 hour marks. The ideal temperature is 80° F. (If you do not have a proofer, set the dough in the warmest part of your home.)
Immediately after the 3 hour mark, cover the dough with plastic wrap and place it in the refrigerator.