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Secondary container other than double -walled tanks (includes interception <br />and detection systems). [Sectio 2633 (07 <br />A. Backfill in secondary container. [Section 2635 (c) 1-81 <br />B. Pore space of granwlar 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 containers) thickness, density, composition, product compatibility. <br />C�LA 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. [ Sectio 2631 (07 <br />Volumetric requirements = 24 hours of 100 year storm in addition to primary container volumes. <br />23. t6e 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 snip. <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 mask constituents to be monitored. <br />24. Membrane liner specifications. (Section 2631; k, 1, and ml <br />3 <br />