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19. -*ZA Secondary container other th doubie-walled tanks (includes intercepts and detection system). Eli 'on 2633 (f)) RP A. Backfill in secondary container. [Section 2635 Cc) 1-87 B. Pore space of granular material used as backfill for primary container(s) complies with Section 2631 (9). (Engineering data to support capacity requirement). .. C. Two or more primary containers within secondary container. (include information on product compatibility). ® 0. Secondary container capable of precluding highest anticipated groundwater. E. Secondary container sloped to a monitoring sump from which leakage or precipitation can be detected and removed. ® F. Water 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 time for detection and removal. [Section 2631 CO] 21. Secondary container(s) volumetric requirements: [Section 2631 (e) (1) and (2)I A. Single primary containers a 100%. ® B. Multiple primary containers a 150% of largest primary container or 10% above aggregate. 22. -#4A Secondary container(s) open to rainfall. C Section 2631 (f)) Volumetric requirements a 24 hours of 100 year storm in addition to primary container volumes. 23. a Secondary container floor. (Section 2631 (i)) A. Constructed on firm base. B. Sloped to collection sump ( 1/3 inch per foot). (1) One or more access casings installed in sump. (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 mi D