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�. .i <br /> OPTION IA <br /> ARTICLE 3, SECTION 2631 <br /> MOTOR VEHICLE OR NONMOTOR VEHICLE FUEL TANK <br /> CONSTRUCTION STANDARDS <br /> ✓l . Secondard containment provided. <br /> Primary containers shall be product tight. <br /> 3. Secondary containers <br /> A. Thickness, density, composition, and product compatibility. <br /> B. Sized to contain unauthorized releases for sufficient time to allow <br /> detection and removal . <br /> 4. Secondary container volumetric requirements <br /> A, Single primary container = 100%. <br /> B. Multiple primary containers = 150% of largest primary container or <br /> 10% above -aggregate. <br /> 1 . Document interproduct compatibility <br /> 5. Secondary containers open to rainfall . <br /> A. Volumetric requirement = 24 hours of 25 year storm in addition to <br /> jprimary container volumes. <br /> b. Pore space of granular material used as backfill for the primary containers. <br /> / A. Refer to Section 2631 (g). <br /> �/. Secondard container equipped with a collection system. <br /> A. Designed to: <br /> 1 . Accumulate <br /> 2. Temporarily store <br /> 3. Permit removal of: <br /> a. Precipitation <br /> b. Subsurface infiltration <br /> c. Released hazardous substances from primary container(s) . <br /> �8. Floor of Secondary container <br /> A. Constructed on firm base <br /> B. Sloped to collection sump (1/8" per foot) . <br /> 1 . One or more access casings installed in sump <br /> a. Sized to allow removal of collected liquid <br /> b. Extend to ground surface <br /> c. Perforated in sump region. <br /> d. Covered with a locked waterproof cap or within a secured facility <br /> e. Thick enough to withstand anticipated stresses <br /> f. Construction materials: <br /> 1 ) Are not weakened by stored product <br /> 2) Will not donate, capture, or mask constituents to be analyzed. <br /> 9. Membrane liner specifications: <br /> A. Refer and comply with Article 3, Section 2631 J. k, 1 , and m. <br />