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Modern Welding Company of Florida, Inc. <br /> 1801 Atlanta Ave. <br /> modern Orlando FL 32806 <br /> Fabricators of Metal Products <br /> 407-843-1270 Phone 407-423-8187 Fax <br /> Periodic Interstitial Test Procedure <br /> 1. Establish a vacuum of 11" +/- 1" of Hg on the tank's interstitial space through the <br /> monitor pipe. <br /> Note: All of the air must be removed from the tank's interstitial space before a <br /> consistent vacuum reading can be established. It may take several attempts to <br /> establish a vacuum before a constant reading can be established. <br /> 2. Maintain the vacuum on the interstitial space for the minimum time specified in <br /> Table 3. <br /> 3. Check the vacuum after the time specified. A vacuum drop of less than 5" Hg <br /> confirms the integrity of both the inner and outer tank. <br /> 4. A vacuum drop of more than 5" of Hg during test period may require further <br /> investigation. <br /> 5. If further investigation is required, contact the tank installation company. After <br /> investigation is complete, this test shall be repeated. <br /> 6. This test meets the EPA requirements for tightness testing of operating <br /> underground storage tanks containing product. <br /> Additional Information... <br /> Tanks sizes not listed in Table 3 (Maximum Capacity allowed is 50,000 gallon.) <br /> The test time for the test cell volume is then scaled linearly to the volume of any interstice using the <br /> equation: <br /> Test Time = (Vtank/Vicell) x Well <br /> Table 3 contains most of the standard tank sizes. However, it is possible that a tank of a different size <br /> may need to be tested. In that case, the equation can be used to determine the required minimum test <br /> time. Substitute the interstitial volume of the tank to be tested for Vtank and use 5.0 gallons for Vicell. <br /> Use 11.0 hours (the duration for water) for tcell and calculate the required time using the equation. <br />