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19. NO Secondary container other thb., double-walled tanks (includes interception <br /> and detection systems). [Section 2633 (f)] <br /> A. Backfill in secondary container. [Section 2635 (c) 1-81 <br /> B. Pore space of granular material used as backfill for primary container(s) complies with Section 2631 <br /> (g)• [Engineering data to support capacity requirement]. <br /> C. Two or more primary containers within secondary container. (include information on product <br /> compatibility). <br /> D. Secondary container capable of precluding highest anticipated groundwater. <br /> E. Secondary container sloped to a monitoring sump from which leakage or precipitation can be detected <br /> and removed. <br /> F. Water tight corner which extends at least a foot beyond each boundary of the secondary container <br /> excavation, sloped to drain away from excavation. <br /> 20. Secondary container(s) thickness, density, composition, product compatibility. <br /> X Sized to contain unauthorized releases from primary containers to allow sufficient time for detection and removal. <br /> [Section 2631 (c)] <br /> 21. X Secondary container(s) volumetric requirements: [Section 2631 (e) (1) <br /> and (2)] <br /> X A. Single primary containers = 100%. <br /> Ej'� B. Multiple primary containers = 150% of largest primary container or 10X above aggregate. <br /> 22. NO Secondary container(s) open to rainfall. [ Section 2631 (f)] <br /> Volumetric requirements = 24 hours of 100 year storm in addition to primary container volumes. <br /> 23• X Secondary container floor. [Section 2631 (i)] <br /> X A. Constructed on firm base. <br /> XB. Sloped to collection sump ( 1/8 inch per foot)P 1 P e <br /> (1) One or more access casings installed in sump. <br /> X (a) Size to allow removal of collected liquid. <br /> X (b) Extended to ground surface. <br /> _ (c) Covered with a locked waterproof cap or <br /> within a secured facility. <br /> X (d) Thickness allows for anticipated stresses. <br /> X (e) Construction materials are not weakened stored product or will not donate, <br /> capture, or mask constituents to be monitored. <br /> 24. \ Memorane liner specifications. [Section 2631; k, 1, and ml <br /> 6 <br />