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<br /> <br />CAPACITY CALCULATION <br />Map I. D. No. 7 <br />Area = 20 x 30 <br />= 600 ft2 <br />Height = 2 ft <br />~~ <br />Volume = 600 ft2 x 2 ft <br />= 1,200 ft3 <br />1,200 ft3 x 7.481 gallons/ft3 = 8,977 gallons <br />Largest Tank = 4,000 gallons <br />8,977 - 4,000 = 4,977 gallons <br />4,977 gallons = 7.481 gallons/ft3 = 665 ft3 <br />665 ft3 = 600 ft2 = 1.1 ft Freeboard <br />