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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 Al, 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 Option Al OK? Option A2 OK? Option B OK? Option C OK? Option D OK? <br /> 7/1/2003- ➢ Yes if Ball Float ➢ Yes ➢ Yes if BF ➢ Yes ➢ Yes <br /> Present (BF)installed installed prior <br /> prior to to 10/1/2018 <br /> 10/1/2018 ➢ No if BF <br /> ➢ No if BF installed on or <br /> installed on or after 10/1/2018 <br /> after 10/1/2018 <br /> 7/2/1987— ➢ Yes if UST has ➢ Yes if UST has ➢ Yes if BF ➢ Yes ➢ Yes if UST has <br /> 6/30/2003 monitored fill monitored fill installed prior monitored fill <br /> sump and DW sump and DW to 10/1/2018 sump and DW <br /> U/G Vent Line U/G Vent Line ➢ No if BF U/G Vent Line <br /> and BF installed ➢ No if direct installed on or ➢ No if direct <br /> prior to bury spill after 10/1/2018 bury spill <br /> 10/1/2018 bucket bucket <br /> ➢ No if direct ➢ No if ➢ No if <br /> bury spill unmonitored unmonitored <br /> bucket fill sump fill sump <br /> ➢ No if ➢ No if SW or ➢ No if SW or <br /> unmonitored unmonitored unmonitored <br /> fill sump U/G Vent Line U/G Vent Line <br /> ➢ No if SW or <br /> unmonitored <br /> U/G Vent Line <br /> ➢ No if BF <br /> installed on or <br /> after 10/1/2018 <br /> On or before ➢ Yes if BF ➢ Yes ➢ Yes if BF ➢ Yes ➢ Yes <br /> 7/1/1987 installed prior installed prior <br /> to 10/1/2018 to 10/1/2018 <br /> ➢ No if BF ➢ No if BF <br /> installed on or installed on or <br /> after 10/1/2018 after 10/1/2018 <br /> HMPG-025 4/7—Rev.09/20/18 <br />