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Measure & record "A" and "Z," and then peform the following calculation: <br />"A" I/s S "71 drop tube seal surface to the bottom of the tank <br />(subtract) <br />i 40 ° Upper drop tube flange to the edge of the upper tube adapter <br />(subtract) <br />4.5" Reference offset <br />= (equals) <br />l <br />Final shutoff volume height <br />Locate the final shutoff volume <br />height on the tank chart <br />Use the tank chart provided by the tank <br />provided by the tank <br />manufacturer to record and calculate the following: <br />manufacturer, and record the <br />, 1 �, p� Final shutoff volume <br />C <br />� p gal <br />closest corresponding volume. <br />(divide by) <br />116 ; ga I Actual tank capacity <br />X (muliply by) <br />loo <br />_ (equals) <br />If the final shutoff volume <br />6 % Final shutoff volume percentage <br />percentage is 95% or less, the <br />installation conforms to FFS and <br />industry recommended practices. <br />6 L gal Actual tank capacity <br />- <br />(subtract) p <br />/ U • D J ga I Final shutoff volume <br />= (equals) <br />732 gall Ullage volume remaining <br />The final Shutoff volume Percentage may <br />be greater than 95% as long as the ullage <br />volume remaining is greater than or <br />equal to 250 gaElons, so that "...none of <br />the fittings located on the top of the tank <br />are exposed to product due to <br />overfilling," according to EPA 40 CFR Part <br />280. The installation must also meet all <br />applicable regulatory requirements, and <br />must be acceptable to the Authority <br />Having Jurisdiction (AHJ). <br />