COMPLIANCE INFO_1999-2005 - Laserfiche WebLink

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14.2.DIPSTICK PREPARATION 15.1.2.Check with federal,state and local officials for require- 14.2.1.Drive a small-headed,nonsparking nail(for example, ments in your area. brass)halfway into a wooden dipstick 1 inch above its base. 15.2. DOUBLE-WALL TANK 14.3. FIRST DIAMETER READING(PRIOR TO BACKFILL) 15.2.1.A Xerxes double-wall tank has an interstitial space 14.3.1.Place the dipstick into a service fitting. between the wall of the primary(internal)tank and the wall of the secondary(external)tank for the containment and detection 14.3.2.Measure and record the distance from the tank bottom of leaked product from the primary tank. to the top of the fitting. 15.2.2.The tank,as supplied,will have a minimum of one 14.3.3.Pull the dipstick up until the exposed nail catches on the monitor fitting that provides access into the interstitial space. inside top of the tank. 15.3.TANK WITH A DRY INTERSTITIAL SPACE 14.3.4.Measure the distance from the tank top(inside)to the 15.3.1.The monitoring system and method is the responsibility top of the fitting.Subtract 1 inch from this measurement and of the tank owner and/or operator. record the distance. 15.3.2.A safe electronic or mechanical system should be used 14.3.5.Subtract the second distance(inside tank top to top of to detect either product or incoming water. fitting)from the first(tank bottom to top of fitting)and record this value as Deflection Reading"A"on the Tank Installation 15.3.3.The monitoring system should detect leakage near the Checklist. bottom of the tank. 14.4. SECOND DIAMETER READING(AFTER BACKFILL) 15.3.4.Monitoring can be done through the monitor fitting 14.4.1.Place the dipstick into a service fitting with a standpipe. provided. 14.4.2.Measure and record the distance from the tank bottom 15.3.5. If a double-wall tank is sloped,the monitor should be at to the top of the standpipe. the low end. 14.4.3.Pull the dipstick up until the nail catches on the inside 15.4. TANK WITH LIQUID-FILLED INTERSTITIAL SPACE top of the tank. 15.4.1. GENERAL 14.4.4.Measure the distance from the tank top(inside)to the 15.4.1.1. In a liquid-filled monitoring system,the interstitial top of the standpipe.Subtract 1 inch from this measurement and space is typically filled with monitoring fluid at the point of record the distance. manufacture. 14.4.5.Subtract the second distance(inside tank top to top 15.4.1.2.The system enables the owner to have continuous of standpipe)from the first(tank bottom to top of standpipe) monitoring or to conduct a tank-tightness test,TRUCHEK®, and record this value as Deflection Reading"B"on the Tank which meets the EPA criteria for tank-tightness testing. (See Installation Checklist. separate Xerxes document on TRUCHEK®.) 14.5. CALCULATION AND COMPARISON 15.4.1.3.The level in the reservoir is set at the plant to a 14.5.1.Subtract Deflection Reading"B"from Deflection predetermined position,approximately 3 inches above the top of Reading"A". the tank.When the tank is delivered,check the monitoring-fluid level and record it on the shipping/receiving paperwork and Tank 14.5.2.Compare this value to the Table of Maximum Allowable Installation Checklist. (See FIGURE 15-1.) Deflections shown on the Tank Installation Checklist. Label 14.5.3.Vertical deflection in excess of these values indicates improper installation and voids the tank warranty. Reservoir UZ"m Lei Monitoring-Fluid 15.1. SINGLE-WALL TANK Level 15.1.1.Single-wall tank installations may require release i detection monitoring,which can include inventory control, automatic tank gauging,vapor monitoring or groundwater monitoring. FIGURE 15-1 19