COMPLIANCE INFO_1999-2001 - Laserfiche WebLink

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14.2. DIPSTICK PREPARATION 14.2.1. Drive a small -headed, nonsparking nail (for example, brass) halfway into a wooden dipstick 1 inch above its base. 14.3. FIRST DIAMETER READING (PRIOR TO BACKFILL) 14.3.1. Place the dipstick into a service fitting. 14.3.2. Measure and record the distance from the tank bottom to the top of the fitting. 14.3.3. Pull the dipstick up until the exposed 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 fitting. Subtract 1 inch from this measurement and record the distance. 14.3.5. Subtract the second distance (inside tank top to top of fitting) from the first (tank bottom to top of fitting) and record this value as Deflection Reading "A" on the Tank Installation Checklist. 14.4. SECOND DIAMETER READING (AFTER BACKFILL) 14.4.1. Place the dipstick into a service fitting with a standpipe 14.4.2. Measure and record the distance from the tank bottom to the top of the standpipe. 14.4.3. Pull the dipstick up until the nail catches on the inside top of the tank. 14.4.4. Measure the distance from the tank top (inside) to the top of the standpipe. Subtract 1 inch from this measurement and record the distance. 14.4.5. Subtract the second distance (inside tank top to top of standpipe) from the first (tank bottom to top of standpipe) and record this value as Deflection Reading "B" on the Tank Installation Checklist. 14.5. CALCULATION AND COMPARISON 14.5.1. Subtract Deflection Reading "B" from Deflection Reading "A". 14.5.2. Compare this value to the Table of Maximum Allowable Deflections shown on the Tank Installation Checklist. 14.5.3. Vertical deflection in excess of these values indicates improper installation and voids the tank warranty. 15. MONITORING 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. 19 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. 15.4.1. GENERAL 15.4.1.1. In a liquid -filled monitoring system, the interstitial space is typically filled with monitoring fluid at the point of manufacture. 15.4.1.2. 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 separate Xerxes document on TRUCHEK®.) 15.4.1.3. The level 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.) Label Reservoir Monitoring -Fluid Level