Using the Guidance Manual for Loading M.V. Grand Haven, determine the amount of ballast required in tank No.1 (P&S) to maintain drafts of 17'-00" forward and 22'-06" aft for a vessel loaded with grain which has a test weight of 39.5 lbs.

Correct Answer: Option B — 170 tons each

Utilizing the M.V. Grand Haven loading manual, the required ballast for specific draft targets is determined by cross-referencing the vessel's displacement and longitudinal center of flotation. For the specified grain test weight and target drafts of 17'-00" forward and 22'-06" aft, 170 tons per tank is required.