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LG 150-2 Enclosure Summary Table Summary of Underground Storage Tank Overfill Prevention Options Health &Safety Code(H&SC),Sections 25281.5,25290.1, 25290.2, 25291, and 25292 CCR,Title 23, Division 3, Chapter 16,Sections 2635,2636,and 2665 H&SC 25291 H&SC 25290.1& 25290.2 Overfill Over fill Product Level Regulatory Venr/Tank Riser Ventlfcu:k Riser Pipilrg Vent/lank Riser Prying ;i;`dirys Prevention System Prevention Citation Piping Subject to Subject to Secondary Subject to Secondary �•.=-:" Mechanism CCR, Title 23 Corrosion Containment4? Containment? "Examples" Protection? §2636(a)(1) 2636(b Flow restrictor Ball float' 90% §2635(b)(2)(A) YES YES4 YES if - - - - -- _ _ - - - - - -- - - - - -- ---- --- - - - - - 2 -•---.-•-•- •-------------------------------------------------------------•----------- Y i-' - - Audible and a l External alarni 90% §2635(b)(2)(A) YES YES YES a, visual alarm g 'x At least 30 minutes "may Ball float' before tank overfills & filled to no more than Flow restrictor And 95%of tank capacity §2635(b)(2)(B) NO' NOS YES (_!�y At least five minutes External alarm before tank overfills e Positive shut off Fill tube? valve 11 s ( )( )(� i ` valve (flapper) 95`p0 §2635 6 2 NO' NO YES b; Positive shut off Fill tube?valve §2635(b)(2)(D) YES" valve (fla er Below tank top Fittings YES YES pP ) 1 In order to provide proper flow restriction,a ball float is required under all open risers except the fil I riser and automatic tank gauging port. 2 If both types of overfill prevention systems(ball float and fill tube valve)are installed,the ball float may interfere with the operation of the fill tube valve if the ball float is installed lower than the fill tube valve. Therefore,the ball float should be installed at a higher level than the fill tube valve so that the fill tube valve is activated prior to any flow restriction. 'Corrosion protection is not required in this case because the vent/tank riser piping is exempt from the definition of"pipe"pursuant to H&SC§25281.5. However,it is a best management practice to provide corrosion protection for all corrodible piping in contact with the backfill. 4 Secondary containment is required at post July 1, 1987 installations because with this type of overfill prevention the components do not meet the exemption criteria of Section 2636(a)(1),CCR- ' CR' Single-walled components of UST systems may be a source of product or vapor releases to the subsurface environment,even if they do not routinely contain product. Therefore,we recommend installation of secondary containment on all UST components,including those currently exempt from this requirement.