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5.5.4. Polyethylene film is not considered an effective geotextile material. It may tear or degrade while in service. CAUTION Xerxes recommends that every site be thoroughly evaluated for the potential of a rise in the local water table or of trapped water. Failure to anchor a tank when required may cause tank failure, or damage the tank or surrounding property. 6.1. DEADMEN 6.1.1. Deadmen are typically reinforced concrete beams. 6.1.2. The length of deadmen is typically equal to the length of the tank. 6.1.3. Deadmen may be fabricated in multiple sections as long as the total length of each deadman is not decreased and as long as each section contains at least two balanced anchor points. 6.1.4. The width and thickness of deadmen depend on the tank diameter, water -table height, number of containment sumps and burial depth. 6.1.5. Deadmen should be designed according to the American Concrete Institute (ACI) code. 6.1.6. Refer to TABLE 6-1 for typical deadmen dimensions given the situation of an empty tank with a burial depth of 3 feet, with groundwater to grade and with one containment sump. Tank Diameter Typical Deadman Dimensions (Width x Depth) 4' 6" x 6" 6' 12" x 12" 8' 12" x 12" 10' 18" x 9" 12' 36" x 8" TABLE 6-1 6.1.7. Tanks of 10 -foot diameter with a capacity of 30,000 gallons or larger may require larger deadmen than those in TABLE 6-1, depending on burial depth, to offset buoyancy. Contact technical support at Xerxes Minneapolis for further information. 6.1.8. Lay the deadmen in the excavation parallel to the tank and outside of the tank "shadow." (See FIGURE 5-3.) 6.1.9. In multiple tank installations with deadmen: • each tank will have its own set of deadmen (one deadman may be used between two tanks if the deadman is double in width); • a separate anchor point must be provided for each hold- down strap; • the minimum spacing between tanks must be no less than twice the width of a single deadman. 13 6.2. XERXES PREFABRICATED DEADMEN 6.2.1. Xerxes -supplied prefabricated deadmen are pre- engineered and sized to the tank ordered. As with any deadmen, water -table height, number of containment sumps and burial depth must be considered. 6.2.2. Placement of Xerxes prefabricated deadmen is the same as standard deadmen. (See FIGURE 6-1.) M®h®� WEIEN ®� m9E ®® - ��®® ME91 figuration RN ME MEEMEEMI11111®E®tWll®EM® FIGURE 6-1 6.2.3. Xerxes prefabricated deadmen are supplied with 3/4 -inch - diameter, galvanized, adjustable anchor points (subsequently referred to as anchor points). These anchor points protrude up through the slots in the deadmen and are held up with cotter pins. WARNING Only use the anchor points when lifting and positioning the deadmen. A spreader bar may be required to lift longer sections of deadmen. Use guy ropes to guide the deadmen when lifting. Failure to do so could result in death or serious injury. 6.2.4. The anchor points can be moved and positioned to match the hold-down strap locations on the tank (marked by arrowhead symbols ►® ). 6.2.5. When using these deadmen in man -out -of -hole strapping applications, align the anchor points with the proper ribs before setting them in the hole. 6.2.6. Care should be taken to keep backfill from entering the anchor -point slot until final adjustment is made. 6.2.7. The deadmen are to be butted together when multiple sections are used. 6.2.8. Use one anchor point per strap end and only one strap per anchor point. 6.3. ANCHOR SLAB 6.3.1. An anchor slab is typically a reinforced concrete base.