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7 ` <br /> 20. Secondary container(s) thickness, density, composition, product compatibility. <br /> Sized to contain unauthorized releases from primary containers to allow <br /> sufficient time for detection and removal. [Section 2631 (c)] <br /> 21. H4 Secondary container(s) volumetric requirements: [Section 2631 (e) (1) <br /> and (2)] <br /> A. Single primary containers = 100%. - - <br /> B. Multiple primary containers = 150% of Iargest primary <br /> container or 101-75 above aggregate. <br /> 22. Secondary container(s) open to rainfall. [ Section 2631 (f)] <br /> Volumetric requirements = 24 hours of 1.00 year storm in addition to <br /> primary container volumes. <br /> 23. L(9 Secondary container floor. [Section 2631 (i)] <br /> A Constructed on firm.base. <br /> B. Sloped to ,collection sump ( 1/8 inch per foot). <br /> (1) One or more access casings installed in sump. <br /> (a) Size to allow removal of collected liquid. <br /> (b) Extended to ground surface. <br /> (c) Covered with a locked waterproof cap or <br /> within a secured facility. <br /> (d) Thickness allows &r anticipated stresses. <br /> (e) Construction materials are not weakened <br /> stored product or will not donate, capture, <br /> or mask constituents to be monitored. <br /> 24. r t9 Membrane liner specifications. [Section 2631; k,l, and m] <br /> 8 <br />