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14. Secondary container otherdouble-walled tanks (includes intercept and detection systems).*action 2633 (f)] ® A. Backfill in secondary container. [Section 2635 (c) 1-81 ® 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) D. 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. 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 time for detection and removal. [Section 2631 (c)] 21. Secondary containers) 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. C Section 2631 Ml Volumetric requirements = 24 hours of 100 year storm in addition to primary container volumes. 23. Secondary container floor. [Section 2631 Ci)1 ® A. Constructed on firm base. B. Sloped to collection sump C 1/8 inch per foot). ® (1) one or more access casings installed in sump. ® ;(a) Size to allow removal of collected liquid. Cb) Extended to ground surface. CO Covered with a Locked waterproof cap or within a secured facility. ® Cd) 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, L, and ml a 6