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PEURP1200 - 12 <br /> 4 TANK SECONDARY <br /> CONTAINMENT INTEGRITY <br /> TESTING <br /> 4. 1 General . Double-walled tanks have interstitial <br /> spaces that can be tested for integrity. <br /> There are two methods for testing the integrity of tank <br /> secondary containment systems — dry and wet . Dry test <br /> methods use a partial vacuum to determine the integrity <br /> of the containment. To perforin a wet test on an existing <br /> liquid-filled tank interstitial space, the liquid level in the <br /> t pei ,org <br /> I' <br />