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14.3.3.Pull the dipstick up until the nail catches on the inside 15.4.TANK WITH A WET INTERSTITIAL SPACE top of the tank. 15.4.1.GENERAL 15.4.1.1.In a monitoring system filled with monitoring fluid,the 14.3.4.Measure the distance from the tank top(inside)to the interstitial space is typically filled with monitoring fluid at the top of the standpipe.Subtract 1 inch from this measurement and point of manufacture. record the distance. 14.3.5.Subtract the second distance(inside tank top to top of CAUTION standpipe)from the first distance(tank bottom to top of Monitoring fluid should not be present in the standpipe except standpipe).Record this measurement as Initial Internal during a TRUCHEK®test(See Xerxes'TRUCHEK®brochure) Diameter on the Tank Installation Checklist,SECTION 4. Monitoring fluid in the standpipe may create excessive pressure 14.3.6.For subsequent measurements of the internal diameter, on the interstitial space and may result in tank damage. repeat Points 14.3.1,through 14.3.5.When the measurement is 15.4.1.2.All wet interstitial spaces must be vented to the final diameter measurement,record this measurement as atmosphere.(See SECTION 11.4.) Final Internal Diameter on the Tank Installation Checklist, SECTION 4. 15.4.1.3.The system enables the owner to have continuous monitoring or to conduct a tank-tightness test,TRUCHEK 0, 14.4.CALCULATION AND COMPARISON which meets the EPA criteria for tank-tightness testing.(See the 14.4.1.To get the deflection measurement at any time,subtract Xerxes TRUCHEK®brochure.) the current internal-diameter measurement from the initial internal-diameter measurement. 15.4.1.4.The level of the monitoring fluid in the reservoir is set at the plant to a predetermined position,approximately 3 inches 14.4.2.Compare this measurement to the allowable deflections above the top of the tank. When the tank is delivered,check the shown in the table on the Tank Installation Checklist,SECTION 4, monitoring-fluid level and record it on the shipping/receiving 14.4.3.Vertical deflection in excess of this measurement paperwork and Tank Installation Checklist.(See FIGURE 15-1.) indicates improper installation and voids the tank warranty. Reservoir 15. MONITORING Monitoring-Fluid 15.1.SINGLE-WALL TANK Level 15.1.1.Single-wall tank installations may require release detection monitoring,which can include inventory control,automatic tank gauging,vapor monitoring or groundwater monitoring. 15.1.2.Check with federal,state and local officials for require- FIGURE 15-1 ments in your area. 15.4.1.5.If monitoring fluid is not in the reservoir,call the UST 15.2.DOUBLE-WALL TANK coordinator at the Xerxes plant nearest you. 15.2.1.A Xerxes double-wall tank has an interstitial space between the wall of the primary(internal)tank and the wall of 15.4.1.6.If a tank is sloped,the reservoir should be at the high end. the secondary(external)tank for the containment and detection 15.4.1.7.In a tank with the interstice filled with monitoring fluid, of leaked product from the primary tank. Xerxes recommends using a nonmetalic standpipe in the reservoir. 15.2.2.The tank,as supplied,will have a minimum of one 15.4.1.8.The monitoring-fluid level may fluctuate during shipping monitor fitting that provides access into the interstitial space. and may not be at the 3-inch mark.Do not add monitoring fluid until 15.3.TANK WITH A DRY INTERSTITIAL SPACE after tank burial is completed and the monitoring system is set up. 15.3.1.The monitoring system and method is the responsibility 15.4.1.9.The monitoring-fluid level in the reservoir will rise naturally of the tank owner and/or operator. under various conditions: 15.3.2.A safe electronic or mechanical system should be used preinstallation air test, to detect either product or incoming water. rise in groundwater level, • backfill compaction, 15.3.3.The monitoring system should detect leakage near the product loading, bottom of the tank. product temperature variation. 15.3.4.Monitoring can be done through the monitor fitting 15.4.1.10.Check and record the monitoring-fluid level during the provided. installation process.(See Tank Installation Checklist.) 15.3.5. If a double-wall tank is sloped,the monitor should be at 15.4.1.11.Any monitoring-fluid leaks will be detected during the the low end. preinstallation air test.(See SECTION 3.) 20