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15.3.3.8.1. preinstallation air test 15.3.4.4.After determining the starting point,adjust the moni- 15.3.3.8.2. rise in groundwater level toring fluid based on the product level. 15.3.3.8.3. backfill compaction 15.3.4.4.1. If the tank is between 1/4 and 1/2 full of product, the proper operating level for the monitoring fluid is at the 15.3.3.8.4. ballasting. starting point. '.. 15.3.3.9.Check and record the monitoring-fluid level during 15.3.4.4.2.If the tank is between empty and 1/4 full,the the installation process.See the Tank Installation Checklist. proper operating level for the monitoring fluid is about 1 to 1- 15.3.4. SETTING THE LEVEL OF THE 1/2 inches below the starting point. MONITORING FLUID 15.3.4.4.3. If the tank is between 1/2 full and full,the proper 15.3.4.1.After backfilling and top-slab placement is com- operating level for the monitoring fluid is about 1 to 1-1/2 pleted,check the level of the monitoring fluid in the reservoir inches above the starting point. and set the monitoring fluid to the proper level. 15.3.4.5.Add or remove monitoring fluid to reach the proper NOTE: Failure to set the monitoring-fluid level properly may operating level for the monitoring fluid. lead to false alarms. 15.3.4.6. If a TRUCHEK test is required after installation,follow 15.3.4.2.Once the tank is installed,the level of the monitoring the procedures in the Xerxes TRUCHEK brochure. fluid may fluctuate due to such things as: 15.3.4.6.1.After this test,reset the monitoring-fluid level to a 15.3.4.2.1. product level position based on the product level. 15.3.4.2.2.groundwater fluctuation 16. INSTALLING CONTAINMENT SUMPS 15.3.4.2.3.tank filling and emptying 16.1. GENERAL 15.3.4.2.4. product-temperature variation. 16.1.1.Xerxes containment sumps come in a variety of mod- 15.3.43.To establish the proper operating level for monitoring els and sizes, including single-wall and double-wall models, fluid,decide what type of monitoring probe will be used in and round and flat-sided models. order to determine the initial starting point for the level in the 16.1.1.1. Instructions for the different models are found in reservoir. Xerxes'supplemental materials.See SECTION 20 for informa- 15.3.4.3.1.The typical probe has two sensors(a high-fluid tion on where to obtain supplemental instructions, level and a low-fluid level).When using a two-sensor probe, 16.1.2.The containment sump provides an enclosure for a the starting point(the proper level for the monitoring fluid)is submersible pump and a termination point for secondary pip- midway between the two sensors. ing systems. 15.3.4.3.2. If using something other than a two-sensor probe, 16.1.2.1. It provides containment of product from the pump use 7 inches from the top of the tank as the starting point for and/or piping connections. the monitoring-fluid level. 16.1.2.2. Itis designed to be monitored continuously using NOTE:When using a probe,do not raise it off the tank to electronic sensors. meet the monitoring-fluid level.The probe must remain up- right and in contact with the top of the tank at all times. See 16.1.3.Consult federal,state and local codes and regulations FIGURE 15-2. to ensure proper monitoring compliance. 16.1.4.All Xerxes containment sumps must be isolated from traffic loads. Top slab(by others) 16.1.5.Before installing the containment sump, perform a vi- sual inspection of the sump for potential shipping damage. Street box and electrical 16.1.6. If damage is detected,contact the plant from which Vent reservoir/standpipe hookup(by others) the tank was shipped. (by others) pP Standpipe(by others) CAUTION Probe cable(by others) Always wear eye protection and gloves when handling, Reservoir grinding,cutting and attaching the containment sump unit. Probe(by others) Failure to do so may result in minor or moderate injury. Monitoring-fluid level NOTICE Tank rib(cut away for (�(t sensor placement) not drop the containment sump assembly components or II II or allow the sump body to roll.Since high winds could dam- age the sump components, protect and secure all pieces if windy conditions arise. Failure to follow this notice may re- FIGURE 15-2 sult in damage to surrounding property. 23