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TOTAL CONTAINMENT <br /> UNDERGROUND STORAGE TANK <br /> PERIODICAL TANK TEST FOR <br /> INTERSTITIAL TIGHTNESS <br /> Publication No. DWTPTEST01 <br /> i Effective Date 1-May-01 <br /> Supersedes:None <br /> 1. The vacuum for the test shall be a <br /> minimum of 15" of Hg at the start. F" <br /> { <br /> 2. Test period shall be 12 hours for <br /> tanks up to 10,000 gallons and 24 <br /> hours for tanks greater than 10,000 <br /> gallons. <br /> 3. Vacuum decreases of less than 5 ��►.., .> . <br /> inches of Hq during test period , <br /> indicate that the tank is tight. <br /> 4. Vacuum decreases of more than 5 M <br /> inches of Hg during test period ,§ _ <br /> requires further investigation........ ■ �' + `�+_: *- �• <br /> �.• 4 <br /> 31 <br />