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Hazardous Materials Program Guidance: UST Overfill Prevention — Page 4 of 7 <br />F. Converting from One Overfill Prevention Method to Another <br />Since it is generally easier to inspect an audible and visual overfill alarm system than it is to remove and <br />inspect mechanical overfill prevention valves or flow restrictors (ball floats), some UST owners may be <br />tempted to remove those devices and only use audible and visual alarms triggered @ 90% pursuant to <br />Option A2. For USTs installed on or after July 1, 2003, this is not a problem since all piping connected to <br />those tanks must be secondarily contained and monitored per HSC §25290.1(k) or 25290.2(j). It is also not a <br />problem for USTs installed on or before July 1, 1987. <br />For USTs installed between July 2, 1987 and June 30, 2003, before overfill prevention Options A1, A2 or D <br />are allowed, it must first be confirmed that the tank fill riser pipes and underground vent lines are <br />secondarily contained and monitored. Per 23 CCR §2636(a)(1), vent and riser piping is only exempt if overfill <br />prevention Options B or C are used. <br />Allowed Overfill Prevention Methods <br />Tank Install Date <br />Option A10K? <br />Option A2 OK? <br />Option B OK? <br />Option C OK? <br />Option D OK? <br />7/1/2003 - <br />➢ <br />Yes if Ball Float <br />➢ <br />Yes <br />➢ <br />Yes if BF <br />➢ Yes <br />➢ <br />Yes <br />Present <br />(BF) installed <br />installed prior <br />prior to <br />to 10/1/2018 <br />10/1/2018 <br />➢ <br />No if BF <br />➢ <br />No if BF <br />installed on or <br />installed on or <br />after 10/1/2018 <br />after 10/1/2018 <br />7/2/1987 — <br />➢ <br />Yes if UST has <br />➢ <br />Yes if UST has <br />➢ <br />Yes if BF <br />➢ Yes <br />➢ <br />Yes if UST has <br />6/30/2003 <br />monitored fill <br />monitored fill <br />installed prior <br />monitored fill <br />sump and DW <br />sump and DW <br />to 10/1/2018 <br />sump and DW <br />U/G Vent Line <br />U/G Vent Line <br />➢ <br />No if BF <br />U/G Vent Line <br />and BF installed <br />➢ <br />No if direct <br />installed on or <br />➢ <br />No if direct <br />prior to <br />bury spill <br />after 10/1/2018 <br />bury spill <br />10/1/2018 <br />bucket <br />bucket <br />➢ <br />No if direct <br />➢ <br />No if <br />➢ <br />No if <br />bury spill <br />unmonitored <br />unmonitored <br />bucket <br />fill sump <br />fill sump <br />➢ <br />No if <br />➢ <br />No if SW or <br />➢ <br />No if SW or <br />unmonitored <br />unmonitored <br />unmonitored <br />fill sump <br />U/G Vent Line <br />U/G Vent Line <br />➢ <br />No if SW or <br />unmonitored <br />U/G Vent Line <br />➢ <br />No if BF <br />installed on or <br />after 10/1/2018 <br />On or before <br />➢ <br />Yes if BF <br />➢ <br />Yes <br />➢ <br />Yes if BF <br />➢ Yes <br />➢ <br />Yes <br />7/1/1987 <br />installed prior <br />installed prior <br />to 10/1/2018 <br />to 10/1/2018 <br />➢ <br />No if BF <br />➢ <br />No if BF <br />installed on or <br />installed on or <br />after 10/1/2018 <br />after 10/1/2018 <br />H M PG -025 4/7 —Rev. 09/20/18 <br />