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Buoyant forces are partially resisted by the 6.3 When ballasting the tank, ballast level inside the weight of the tank, the backfill and the pavement tank must never exceed the water level, or atop the tank. Additional buoyant restraint, when backfill level, in the excavation during required, shall be obtained by using property installation. designed hold-down straps in conjunction with concrete hold-down pads or deadman anchors. The use of steel cable or round bar as hold- down straps on the tank is prohibited. Hold dawn strap. IMOuW b,a.c.rand kom m*unk by.n - m.rt wai,un r ' 7.0 FINAL AIR TEST 7,1 Install required tank piping using compatible non- 5.2 Installers of hold-down straps shall ensure that hardening sealant, taking care not to cross the straps are separated from the tank by a pad thread or damage the nylon bushings. Torque of made of inert insulating di-electric material. The separating pad shall be wider than the hold- 400 to 1,000 ft-lbs (542.3 to 1355.82 N-m.) shall down straps,which will prevent direct contact be required to fully insert pipe, between the straps and the tank shell. 7.2 Where air or hydrostatic testing is required after 5.3 Ballasting the tank may be necessary. When installation, the pressure applied shall not be in water is used as the ballast material, it shall only excess of 5 psi (34.5 kPa)as measured at the be potable water and shall not remain In the tank top of the tank- A soap solution shall be applied longer that 60 days, around pipe connections while air test is being performed. 6.0 BACKFILLING 8.0 ELECTRICAL ISOLATION 6.1 Homogeneous backfill material similar to the bedding material shall be carefully placed around 8.1 All openings shall be isolated where electrical the entire tank to create a uniform homogeneous accessories will be installed such as submersible environment. Avoid damage to laminate pump,monitoring equipment and all other especially where tamping is required. grounded electrical devices. a SPECIAL SAWILIL PLACEMENT REOUIRED MON T MEW. �tM 6.2 Installing and tamping backfill along the bottom 8.2 Prior to backfilling to top of tank, all openifgs sides of the tank shall ensure that the tank is shall be visually inspected to assure that the di- fully and evenly supported around the bottom electric isolation (nyton bushings or flange r 3 quadrant. gaskets),where furnished, remains in place. Where flanged openings have been used, Isolation of the flange gaskets shall be confirmed with a continuity tester. CnntAnt with tha.t..L-