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1.3.6.2. PREFERRED METHOD 1.3.6.2.1. The preferred method is to install new tank(s) in a separate hole if space allows and/or if existing tank(s) must remain in service during installation of the new tank(s).The preferred method is described here (see Figure 1-4): • install a new tank in a separate hole at least 3 feet [90 cm] from the original hole • follow procedures outlined in the Installation Manual • maintain the natural barrier of undisturbed soil between tanks • see section 1.3.5 for minimum spacing requirements between tanks • sufficient soil must remain between the excavations so that the backfill in the original excavation does not shift. 11.3.6.3. ALTERNATE METHOD A WARNING Failure to shore tanks if necessary to keep the existing tank(s) from moving could result in death or serious injury. A CAUTION If any existing tank(s) should move during the installation of new tanks, they must be removed and reinstalled according to the tank manufacturer's instructions. Failure to follow this caution could result in minor or moderate injury. 1.3.6.3.1. If the preferred method outlined above is not possible or practical, use the alternate method described here to bury additional tanks in the same installation hole (see Figure 1-4): • Empty existing tanks to less than 1/4 of capacity. • Remove the surface slab. • Enlarge the excavation for the new tanks, but leave as much backfill as possible around the existing tanks. • Install shoring, if necessary, to make sure that existing tanks do not move and that sufficient backfill remains around them. • Follow the procedures and requirements for installing the tanks as outlined in this Installation Manual. • See section 1.2 for backfill requirements, and see section 1.3 for excavation and spacing requirements. 1.3.7. ANCHORING TANKS 1.3.7.1. GENERAL 1.3.7.1.1. The tank owner orthe owner's technical representative is responsible for determining an appropriate anchoring system. 1.3.7.1.2. We recommend that every site be thoroughly evaluated for the potential of a rise in the local water table or of trapped water (a wet -hole condition). Sufficient overburden and/or an appropriate anchoring system must be present to offset buoyancy of the tank in such conditions. NOTICE Failure to provide sufficient overburden and/or an appropriate anchoring system could cause tank failure, or could result in damage to the tank and/or surrounding property. 1.3.7.2. ANCHOR STRAPS GENERAL 1.3.7.2.1. Only our anchor straps may be used when anchoring our tank. 1.3.7.2.2. We have the following anchor strap models: • D-ring/D-ring anchorstraps • man -out -of -hole (MOH) straps • hook/hook anchor straps (in Canada only) NOTE: For information on the hook/hook anchor straps, refer to the Hook/Hook Anchor Straps Instructions supplement. See the Introduction for information on how to obtain this supplement. 1.3.7.2.3. Depending on which type of anchor strap is being used, see section 1.3.7.2.7 (D-ring/D-ring) or 1.3.7.2.9 (MOH). 1.3.7.2.4. The locations for anchor straps on each tank are marked on the tank ribs by the arrowhead symbols H (on the tank itself on 4 -foot -diameter tanks). 1.3.7.2.5. When straps are placed over ribs, make sure that the area between the straps and the ribs is free of rocks or debris. D-RING/D-RING ANCHOR STRAPS 1.3.7.2.6. Our D-ring/D-ring anchor straps are designed for anchoring our tanks. 1.3.7.2.7. While in the tank hole, the ends of the D-ring/D-ring anchor straps are connected to anchor points using hardware described in section 1.3.7.3. MAN -OUT -OF -HOLE (MOH) STRAPS 1.3.7.2.8. The man -out -of -hole (MOH) straps system is designed for use in installations where water is in the excavation and/or where personnel may not enter the tank hole. 1.3.7.2.9. The MOH strap consists of two identical halves. 1.3.7.2.10. The ends of the MOH anchor straps are connected directly