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14.4. VENTING INTERSTITIAL SPACES 15.3.2.5.For liquid or vapor sensors,the monitoring access CAUTION fitting may be vented to atmosphere(independent from the primary tank)or sealed. All wet monitoring systems must be vented for proper oper- ation.Failure to do this may result in damage to the tank and/or surrounding property. A WET INTERSTITIAL SPACE 14.4.1.When the tank's interstitial space is filled with a moni- 15.3.3.1.A double-wall tank may be shipped with a factory- toring fluid,the space must be vented.It is sufficient to drill a installed TRUCHEK®monitoring system. 1/4-inch-diameter hole in the side or cap of the reservoir 15.3.3.1.1.The TRUCHEK system enables the owner to have standpipe as supplied by the installer.If the groundwater level continuous monitoring or to conduct a tank-tightness test. could be high enough to enter a drilled vent hole,install a vent TRUCHEK meets the EPA criteria for tank-tightness testing. line from the standpipe to above high-water level. See the Xerxes TRUCHEK brochure for more information. 14.4.2.When the interstitial space is dry,it Is not necessary to 15.3.3.1.2.When a double-wall tank is shipped with the vent the space to atmosphere. TRUCHEK monitoring system,the interstitial space is typically filled with monitoring fluid at the manufacturing facility. 15. MONITORING TANKS 15.3.3.1.3.Some tanks may be shipped with extra monitoring 15.1. GENERAL fluid so the monitoring-fluid level can be topped off. 15.1.1.It is the responsibility of the tank owner and/or opera- 15.3.3.2.When the tank is delivered and before it is installed, for to determine the appropriate monitoring system and check the monitoring-fluid level and record it on the method if one is to be used. shipping/receiving paperwork and Tank Installation Checklist. 15.2. SINGLE-WALL TANK See FIGURE 15-1. 15.2.1.Single-wall tank installations may require release de- tection monitoring,which can include inventory control,auto- Reservoir matic tank gauging,vapor monitoring or groundwater Monitoring fluid monitoring. 15.2.2.Check with federal,state and local officials for require- ments in your area. 15.3. DOUBLE-WALL TANK FIGURE 15-1 15.3.1. GENERAL 15.3.3.3.The required operating level for the monitoring fluid is 15.3.1.1.A double-wall tank has an interstitial space between approximately 1/2 full.If necessary,fill to the 1/2 full level with the wall of the primary(internal)tank and the wall of the sec- the Xerxes-supplied monitoring fluid shipped with the tank. ondary(external)tank for the detection and containment of product from the primary tank. NOTE:Do not add monitoring fluid until after tank burial is completed and the monitoring system is set up. 15.3.1.2.A double-wall tank,as supplied,will have a minimum of one monitoring access fitting that provides access into the CAUTION interstitial space. All wet interstitial spaces must be vented to atmosphere. 15.3.1.3.Liquid and vapor sensors are installed through the Failure to follow this caution may result in damage to the monitoring access fitting. tank and/or surrounding property.See SECTION 14.4. 15.3.1.3.1.Most sensors can be installed after the tank has 15.3.3.4.If monitoring fluid is not in the reservoir,contact the been backfilled to grade.However,for ease of installation,the Xerxes customer service coordinator. sensor may be inserted into the monitoring access fitting be- 15.3.3.5.In a tank with the interstice filled with monitoring fluid, fore installing the monitoring riser pipe to grade. Xerxes recommends using a nonmetalic standpipe in the reservoir. 15.3.2. DOUBLE-WALL TANK WITHCAUTION A DRY INTERSTITIAL SPACE 15.3.2.1.A safe electronic or mechanical monitoring system Monitoring fluid should not be present in the standpipe ex- cept during a TRUCHEK test.Monitoring fluid in the stand- should be used to detect product and incoming water. pipe may create excessive pressure on the interstitial space 15.3.2.2.The monitoring system should detect product and and may result in damage to the tank.See the Xerxes water at the bottom of the tank. TRUCHEK brochure for more information. 15.3.3.6.The monitoring-fluid level may fluctuate during ship- 15.3.2.3.If ordered as an accessory,use the factory-installed ping and installation. drawstring to facilitate positioning of the monitoring sensor at or near the bottom of the tank. 15.3.3.7.If a tank is sloped,the reservoir should be at the high end. 15.3.2.4.If a double-wall tank is sloped,the monitor should be 15.3.3.8.During the installation process,the monitoring-fluid at the low end. level in the reservoir will rise naturally under various conditions: 22 r \