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Appendix 1 <br /> Acceptable Mechanisms to Demonstrate Compatibility for Underground Storage Tanks <br /> Construction Type <br /> Component Type Single-Walled Tank [Double-Walled Tank <br /> Tank <br /> Primary Containment I I or I & M <br /> (includes any integral secondary containment) §§2633(b)&2640.1 §§2631(b)&6) <br /> Non-Integral Secondary Containment E <br /> (vaults) §2631(d) <br /> Piping <br /> Primary Containment I I or I & M <br /> (includes any integral secondary containment) §§2633(b)&2640.1 §§2631(b)&0) <br /> Non-Integral Secondary Containment E E <br /> (under-dispenser containment and sumps) 2631 d &2666(b)(2) 2631 d <br /> Spill Containers, Overfill Prevention I, E, or M I, E, or M <br /> Equipment, and Ancillary Equipment §§2631(1)&2665(b) §2631(1) <br /> lorI & M IorI & M <br /> Leak Detection <br /> §§2630(d),2638(a),&2643(1) §§2630(d)&2638(a) <br /> Ke <br /> I Independent testing organization approval <br /> E California professional engineering statement <br /> M Manufacturer's statement of compatibility <br /> Page 5 of 5 <br /> January 2019,v 1.0 <br />