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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 j with an arrowhead symbol 11-4. --_ --_ 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 i 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 ;3=°a'"�•r•- ^`=^Ir 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 fikering 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, of the excavation must also be present in the excavation hole in but especially when the tank is installed in the following condi- which the sump or fitting will be placed.See FIGURE 10-2. tions: 9.1.3.1.areas with frequently changing groundwater condi- tions or areas subject to tidal fluctuations 9.1.3.2.unstable soils,such as those cited in SECTION 7.5.3. R 8.1.3.3.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. 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 bed or the ground. FIGURE 10-2 10.1.2.When installing a large bottom sump in a water or 10.1.5.After setting the tank,fill and tamp the space around wastewater tank,see the Xerxes supplement,Large Bottom the sump or fitting by using hand tools before continuing the Sump Installation Instructions.See SECTION 20 for details on backfilling. where to obtain this supplement. 11. TAKING DIAMETER MEASUREMENTS CAUTION 11.1. GENERAL All connections to the tank must be flexible.Provisions must 11.1.1.Diameter measurements must be taken at various be made to accommodate movement and misalignment be- stages of the installation process to verify that the process is tween the piping and the tank.Failure to do this may result proceeding correctly. in damage to the tank and/or surrounding property. 11.1.1.1.It is important that these measurements are taken 10.1.3.While preparing the backfill bedding,dig a hole in the and,if needed,appropriate action is taken so that tank deflec- bottom of the excavation that is large enough to accommo- tion is within allowable limits. date the sump or fitting.See FIGURE 10-1. 18 T