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19. Secondary container other t`rian double -walled tanks (includes interception <br />and detection systems). (Section 2633 (f)] <br />A. Backfill in secondary container. (Section 2635 (c) 1-83 <br />B. Pore space of granular material used as backfill for primary container(s) complies with Section 2631 <br />(9)- (Engineering data to support capacity requirement). <br />C. Two or more primary containers within secondary container. (include information on product <br />compatibility) <br />0. 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 secordary container <br />excavation, sloped to drain away from excavation. <br />20. Secondary container(s) thickness, density, composition, product compatibility. <br />sized to contain unauthorized releases from primary containers to allow sufficient time for detection and removal. <br />[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 container or 10% 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 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 stored product or will not donate, <br />capture, or mresk constituents to be monitored. <br />24. Membrane liner specifications. [Section 2631; k, 1, and m0 <br />R <br />