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1 _. <br /> Measure & record "A" and " Z, " and then peform the following calculation : <br /> " A " I 1 50 " Drop tube seal surface to the bottom of the tank <br /> - ( subtract) <br /> 6 6 . 5 " Upper drop tube flange to the edge of the upper tube adapter <br /> - ( subtract) <br /> 4 . 5 Reference offset <br /> _ ( equals ) <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 provided by the tank <br /> manufacturer to record and calculate the following : manufacturer, and record the <br /> r closest corresponding volume . <br /> gal Final shutoff volume <br /> ;1 ( divide by) <br /> 15 � <br /> gall Actual tank capacity <br /> X ( muliply by ) <br /> 100 <br /> r E = ( equals ) If the final shutoff volume <br /> I p i 100 r percentage is 95% or less, the <br /> E v I u q I 75/o Final shutoff volume percentage installation conforms to FFS and <br /> Lindustry recommended practices . <br /> Actual tank capacity <br /> The final Shutoff Volume Percentage may <br /> - ( subtract) be greater than 95% as long as the ullage <br /> i G 5 S gal Final shutoff volume volume remaining is greater than or <br /> _ ( equals ) equal to 250 gallons, so that " . . . none of <br /> the fittings located on the top of the tank <br /> 7QgallUllage volume remaining 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 /> 17.i , <br />