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A = The distance from the seat surface of the upper drop tube to the bottom of the underground storage tank . The seat surface will vary depending on the type of installation . See below. Underneath Fill Adapter Underneath Bucket Inside Bucket ( EBW Legacy Series ) (Phil•Tite Series) ( Defender Series ) A e o A A A 7B = FINAL SHUTOFF VOLUME HEIGHT - - According to industry recommended practices , FFS recommends that you set the final shutoff volume to a maximum of 95 % of the actual tank capacity. To find the final shutoff volume height, multiply the actual tank capacity ( gallons ) by the final shutoff volume percentage . ( if you are using 9S % tank volume , multiply the actual tank capacity by . 95 . ) You then locate the closest volume on the tank chart ( provided by the tank manufacturer ) , and record the corresponding height for " B . " * * NOTE : To accommodate tank tilt or increased/decreased usage of tank capacity, the final shutoff volume can be adjusted to a value other than 9S %, providing it meets all applicable regulatory requirements , and is acceptable to the Authority Having Jurisdiction (AH1 ) . If the final shutoff volume is not installed at 9S %, the installing contractor should document the new volume as intended and include it with the station records as reference for compliance inspections . The installing contractor can do this on the " OPV Installation Record Sheet " or any other applicable station records . If the final shutoff volume is installed greater than 95 %, make sure in all cases that there is at least 2S0 gallons of ullage volume remaining so that " . . . none of the fittings located on the top of the tank are exposed to product due to overfilling " according to EPA 40 CFR Part 280 . 7 ��i;