2640 x 1320 x 900 = 3,136,320,000 cubic feet x 7.5 gallons per cubic foot = 23,522,400,000 gallons.
23.5 billion gallons of poison.
Should have pointed out the pit is 1750’ deep thus the reason I only used a 1/4 total sq/ft area as an estimate. There is much more than 23B/gal of poison in that pit.