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19. Secondary container othe an double-walled tanks (includes intercepti and detection systems). (`Section 2633 Ml IA. Backfill in secondary container. [Section 2635 (c) 1-83 _ B. Pore space of granular material used as backfill for primary container s) comQlies with Section 2631 (g). [Erg i neering data to support capacity requiremenO. C. Two or sore primary containers within secondary container. (include information on product coqutibility) _ V. Secondary container capable of precluding highest anticipated groundwater. E. Secondary container sloped to a monitoring sung from which leakage or precipitation can be detected and removed. _ F. Yater tight corner which extends at least a foot beyond each boundary of the secondary container excavation, sloped to drain away from excavation. 20. secondary container(s) thickness, density, composition, product compatibility. Sized to contain unauthorized releases from primary containers to allow sufficient tine for detection and removal. [Section 2631 (c)) 21. Secondary container(s) volumetric requirements: [Section 2631 (e) (1) and (2)) A. Single primary containers - 100%. B. Multiple primary containers - 150% of largest primary container or 10% above aggregate. 22. Secondary container(s) open to rainfall. [ Section 2631 (f)) _ Volunetric requirements = 24 hours of 100 year storm in addition to primary container volures. 23. Secondary container floor. (Section 2631 (i)] A. Constructed on firm base. B. sloped to collection sung ( 1/8 inch per foot). (1) One or more access casings installed in sung. (a) Size to allow removal of collected liquid. (b) Extended to ground surface. (c) Covered with a locked waterproof cap or within a secured facility. (d) Thickness allows for anticipated stresses. _ (e) Construction materials are not weakened stored product or will not donate, \ capture, or mask constituents to be monitored. 24. ` Membrane liner specifications. [Section 2631; k, 1, and m) 6