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8.8.1.4.Lower each deadman to the bottom of the excavation using the wire rope. 8.8.1.5.Center each anchor strap on each location marked with an arrowhead symbol 10-4. - 8.8.1.6.Bring the live end of each wire rope up to the top of = the tank at each marked location. 8.8.1.7.Take the slack out of each wire rope and splice the termination of the wire ropes on top of the tank. 9. GEOTEXTILE FABRIC 9.1. GENERAL 9.1.1. Geotextile fabric allows the passage of water in and out - of the excavation but prevents the migration and mixing of in ^�=•^^Pln ° t?'�°°;`t�. - situ soil and the select backfill material.Geotextile helps pre- serve the integrity of the select backfill envelope that sur- _ rounds and supports the tank. 9.1.2.The tank owner or the owner's technical representative is responsible for determining whether a geotextile or an alter- nate filtering technique is appropriate for a specific installation. FIGURE 10-1 9.1.3. Using geotextile fabric is considered good installation 10.1.4.The required 12 inches of backfill bedding on the bottom practice and Xerxes recommends using it in any installation,but of the excavation must also be present in the excavation hole in especially when the tank is installed in the following conditions: which the sump or fitting will be placed.See FIGURE 10-2. 9.1.3.1.areas with frequently changing groundwater condi- tions or areas subject to tidal fluctuations i 9.1.3.2. unstable soils,such as those cited in SECTION 7.5.3. 9.1.3.3.water conditions with silty in situ soil. 9.1.4. For further information concerning geotextile specifica- tions and installation procedures,consult the geotextile sup- plier's installation guidelines or instructions. 9.1.5. Polyethylene film is not considered an effective geotex- tile material because it may tear or degrade while in service. 9.1.6. If geotextile is used,the bedding material is to be placed on top of geotextile. _•�•° �•;+„c ;;�, f.ats'3,7_;c�:_,,. 10. BOTTOM SUMPS AND FITTINGS 10.1. GENERAL 10.1.1.When handling a tank with a bottom sump or fitting,al- ways take extra care so that the bottom sump or fitting is not damaged by contact with any other object,such as the truck FIGURE 10-2 bed or the ground. 10.1.5.After setting the tank,fill and tamp the space around the sump or fitting by using hand tools before continuing the 10.1.2.When installing a large bottom sump in a water or backfilling. wastewater tank,see the Xerxes supplement, Large Bottom Sump Installation Instructions. See SECTION 20 for details on 11. TAKING DIAMETER MEASUREMENTS where to obtain this supplement. 11.1. GENERAL NOTICE 11.1.1.Diameter measurements must be taken at various stages of the installation process to verify that the process is All connections to the tank must be flexible. Provisions must proceeding correctly. be made to accommodate movement and misalignment be- tween the piping and the tank.Failure to do this may result 11,1,1.1. It is important that these measurements are taken in damage to the tank and/or surrounding property. and,if needed,appropriate action is taken so that tank deflec- 10.1.3.While preparing the backfill bedding,dig a hole in the tion is within allowable limits. bottom of the excavation that is large enough to accommo- date the sump or fitting.See FIGURE 10-1. 18