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standpipe).Record this measurement as Initial Internal Diameter 15.4.12.When the tank is delivered,check the monitoring-fluid on the Tank Installation Checklist,SECTION 4, level and record it on the shipping/receiving paperwork and Tank 14.3.6.For subsequent measurements of the internal diameter, Installation Checklist(See FIGURE 15-1.) repeal Points 14,3.1,through 14.3.5.When the measurement is the i I final diameter measurement,record this measurement as Final n�rrvw, Internal Diameter on the Tank Installation Checklist,SECTION 4. I 1 MfmNO:/vj Ilovi ' 14.4.CALCULATION AND COMPARISON 14.4.1.To get the deflection measurement at any time,subtract the current internal-diameter measurement from the initial internal- diameter measurement. I 14.4.2.Compare this measurement to the allowable defections FIGURE 15.1 shown in Lire table on the Tank Installation Checklist,SECTION 4. 14.4.3.Vertical deflection in excess of this measurement indicates 15.4.1.3.It monitoring fluid's not in the reservoir,call the UST improper installation and voids the tank warranty, coordinator at the Xerxes plant nearest you. 15.4.1.4.The TRUCHEK system enables the owner to have • • continuous monitoring or to conduct a tank-tightness test. 15.1.SINGLE-WALL TANK TRUCHEK meets the EPA criteria for tank-tightness testing.(See the Xerxes TRUCHEKbrochure.) 15.1.1.Single-wall tank installations may require release detection ------».� monitoring,which can ioduria inventory control automatic tank 15.4.1.5 7n a tank with the inters[ce BUed with monito ng h d. gauging,vapor monitoring or groundwater monitoring Xerxes recommends using a nonmetalic�the reservoir, 15.1.2.Check with federal,slate and local officials for require- ments in your area. 15.1.DOUBLE-WALL TANK MonlWrig fluid should not be present In the standpipe except riming a TRUCHEK test(See the Xerxes TRUCHEK brochure.) 15.2.1.A Xerxes double-wall tank has an interstitial space Monitoring fluid in the standpipe may create excessive pressure between the wall of the primary(internal)tank and the wall of the on the intersd6al space and may result in tank damage. secondary(external)tank for the containment and detection of leaked product from the primary tank. 15.41.6.The monitoring-Quid level may fluctuate during shipping and installation.Do not add monitoring fluid until after tank burial is 15.2.2.The tank,as supplied,will have a minimum of one monitor completed and the monitoring system is set up. fitting that provides access into the interstitial space. 15.4.1.7.During the installation process,the monitodrg-fluid level in 15.3.TANK WITH A DRY INTERSTITIAL SPACE the reservoir will rise naturally under various conditions: 15.3.1.The monitoring system and method is the responsibility of • preinstallation air test the tank owner and/or operator. • rise in groundwater level 15.3.2.Assfe electronic or mechanical system should be used to backfill compaction defect either product or incoming water. ballasting. 15.4.1.8.If a tank is sloped,rhe reservoir will be at the high end. 15.3.3.The monitoring system should detect leakage near the bottom of the tank. 15.4.1.9,Check and record the morntoring•fluid level during the 15,14.Monitoring can be done through the monitor fitting provided, installation process.(See Tank Installation Checklist.) 15.5.5.If a double-wall lank is sloped,the monitor should be at the 15.4.1.10.Any monAoring-fluid leaks will be detected during the preinstallation air test(See SECTYON 3.) low end. 15.4.TANK WITH A WET INTERSTITIAL SPACE 15A1.SETTING THE LEVEL OF THE MONITORING FLUID 15.4,1.GENERAL 15.4.2.1.After backfilling and top-slab placement is completed, check the level of the monitoring fluid in the reservoir and set the 15.4.1,1.With a wet interstitial monitoring system(TRUCHEKe), monitoring fluid to the proper level. the interstitial space is typically filled with monitoring fluid at the manufacturing facility. CAUTION CAUTION Failure to set die monitoring fluid level properly may lead to false All wet interstitial spaces must be vented to atmosphere.(See alarms. SECTION 11.4.) E ' d L PON 8002 'Z ' �00