(15 points) A standard BOD test is run using seeded dilution water. In one bottle, the waste sample is mixed with seeded dilution water at a dilution of 1:30. Another bottle, the blank, contains just seeded dilution water. Both bottles begin the test with DO at the saturation value at 20o C of 9.1 mg/L. After five days, the bottle containing waste has a DO equal to 2.5 mg/L, while that containing just seeded dilution water has a DO equal to 8.0 mg/L. Find the five-day BOD of the water.