COMPLIANCE INFO_2002-2006 - Laserfiche WebLink

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