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•s • • • <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. 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 largest primary <br />container or 10175 above aggregate. <br />22. Secondary container(s) open to rainfall. [ Section 2631 (f)] <br />Volumetric requirements = 24 hours of 100 year storm in addition to <br />primary container volumes. <br />23. 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 for 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. Membrane liner specifications. [Section 2631; k,l, and m] <br />