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20. Secondary con 'ner(s) thickness, density, c position, product compatibility. <br /> Sized to con 'n unauthoriz releases from primary containers to allow <br /> sufficient time detecd and removal. [Section 2631 (c)] <br /> 21. Secondary contain volumetric requirements: [Section 2631 (e) (1) <br /> and (2)] <br /> A. ingle primary Mainers = 100%. - <br /> Multiple primary co ainers = 150%o of largest primary <br /> container or 10% above aggregate. <br /> 22. Secondary container open rainfall. [ Section 2631 (f)] <br /> Volumetric re ' e nts = 24 hours of 100 year storm in addition to <br /> primary co ner vol S. <br /> 23• Secondary container oar. [Section 2631 (i)] <br /> A. Constructe on firm base. <br /> B. Sloped to coIle ion sump ( 1/8 in per foot). <br /> (1) One or are acces casings installed in sump. <br /> (a) Siz t allow removal of collected liquid. <br /> (b) E en d to ground surface. <br /> (c) Covered h a locked waterproof cap or <br /> within a secu ed facility. <br /> d) Thickness allows or anticipated stresses. <br /> (e) Construction materi s are not weakened <br /> stored product or will of donate, capture, <br /> or mask constituents to be monitored. <br /> 24• Membrane liner specifications. [Section 2631; k,l, and m] <br /> 8 <br />