COMPLIANCE INFO_1995-2011 - Laserfiche WebLink

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r Continuous Leak Monitoring The installing contractor fills the cavity between the inner and outer tank walls with water. An antifreeze mixture is required for cold climate areas. Fluid is added in the Fiberglas Reservoir, (which is surface mounted on the tank top) until the reservoir is 213 full. A stable liquid level in the reservoir indicates that both the inner and outer walls of the double-wall tank are "tight" The liquid level in the reservoir will fluc- tuate as the temperature of the incoming stored product changes. The reservoir is designed to provide adequate capacity for normal thermal expansion and contraction. In the unlikely event of a tank leak, the liquid will totally drain from the Fiberglas reservoir. If the leak is in the primary tank, the reservoir monitoring fluid will drain into the primary tank. Conventional water -finding paste can detect the presence of reservoir fluid in the bottom of the primary tank. The reservoir liquid level can be moni- tored periodically by using a dipstick or continuously by using optional electronic equipment from Owens-Corning or another monitoring equipment vendor. An annual inspection of the reservoir liquid level is recommended. Refill the reservoir to maintain the liquid level at approximately six inches. 11 Precision Tank Testing In the unlikely event the reservoir drains, a two-phase testing sequence can confirm and quantify the tank leak. The first test, or Phase -One Test, is a simple test to confirm that a potential tank leak has occurred. It also can screen for potential false alarms. Although unlikely, the reservoir may drain from a false alarm condition, such as escaping trapped air or extreme tempera- ture changes (a change of over 65° F) of the delivered product. If the results of the Phase -One Test continue to indicate a potential tank leak, and no reservoir fluid is detected in the primary tank, Owens-Corning will conduct a Phase Two Test to confirm and quantify the tank leak. EA Summary of the Phase -One Test Procedure The Phase -One tank tightness test is simple and easy to perform. After adjusting the Fiberglas reservoir liquid level for potential high groundwater conditions, the liquid level is measured with a dipstick. After an eight hour waiting period, the reservoir level is measured again. A 4" liquid measure- ment change from the initial reading indicates a potential tank leak. The total Phase -One Test can be completed in a 12 hour period. Product can be dis- pensed during the test; however, product deliveries are not permitted during, or nine hours preceding, the Phase -One Test.