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LG 150-2 Enclosure <br /> Summary Table <br /> Summary of Underground Storage Tank Overfill Prevention Options <br /> Health &Safety Code(H&SC), Sections 25281.5, 25290.1,25290.2, 25291,and 25292 <br /> CCR, Title 23, Division 3,Chapter 16,Sections 2635, 2636, and 2665 <br /> H&SC 2S291 H&SC 25290.1& <br /> 25290.2 <br /> ORIN <br /> Ovelfrll Overfill Product Level Regulatory en at Riser Vet:t/Tatik Riser Piping Vetu/Tank Ricer Pipi►ig <br /> Prevention System Preven ion Citation Piping Sir io Subject to Secondary Subject to Secondary <br /> Mechanism CCR,Title 23 Corrosion Corrtahwie110 Containment? <br /> "Examples" Protection? §2636(a)(1) <br /> §2636(b) <br /> ,> <br /> Flow restrictor Ball float 90% §2635(b)(2)(A) YES YES° YES <br /> ; I <br /> 1= <br /> Audible and Yl?5 a <br /> External alarm 90% §2635(b)(2)(A) YES YES <br /> s visual alarm <br /> $4;::i At least 30 minutes <br /> Ail Ball float' before tank overfills & <br /> filled to no more than <br /> a ; <br /> Flow restrictor And 95%of tank capacity §2635(b)(2)(B) TF03 t�F05 YES <br /> ' ' External alarm At least five minutes <br /> dltbefore tank overfills <br /> Positive shut off Fill tubc valve 9596 §2635(b)(2)(C) NO3 NOS YES <br /> ^l='-•i valve (flapper) <br /> Positive shutoff Fill tube2 valve Below tank top fittings §2635(b)(2)(D) . YES YES4 YES <br /> •1 <br /> valve (flapper) <br /> In order to provide proper flow restriction,a ball float is required under all open risers except the fill riser and automatic tank gauging port. <br /> 21f 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 <br /> 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 <br /> activated prior to any flow restriction. <br /> 3 Corrosion protection is not required in this case because the ventftank riser piping is exempt from the definition of"pipe'pursuant to H&SC§25281.5. However,it <br /> is a best management practice to provide corrosion protection for all corrodible piping in contact with the backfill. <br /> d 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 <br /> of Section 2636(a)(1),CCR <br /> 5 Single-waited 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. <br /> Therefore, we recommend installation of secondary containment on all UST components,including those currently exempt from this requirement. <br />