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5.3.WET-HOLE INSTALLATION 5.4.1.2.When installing a large bottom sump in a water or wastewater tank,see the Large Bottom Sump Installation Instructions supplement. with the modifications listed.Follow the dry-hole installation instructions(in section 5.2) See the Introduction fordetails on where to obtain this supplement. with th 5.3.2.Perform points 5.2.1 through 5.2.4 of the dry-hole NOTICE installation instructions. All connections to the tank must be flexible.Provisions must be made to accommodate movement and misalignment between 5.3.3.Before performing point 5.2.5 of the dry-hole installation the piping and thetank.Failure to do this could result in damage instructions,pump waterfrom the excavation hole and continue pumping to the tank and/or surrounding property, to maintain minimum water level during tank installation. 5.4.1.3.While preparing the backfill bedding,dig a hole in the bottom of • Attempt to maintain the water level below the top of the bedding theexcavation thatislarge enough to accommodate the bottom sump orfitting. materials until the tank can be fully backfilled and ballasted. 5.3.4.Proceed with points 5.2.5 through 5.2.9 of the dry-hole 5.4.1.4.When installing a UL-or ULC-label tank equipped with a bottom installation instructions. sump,excavation and bedding must be modified to provide a 12-inch-deep [30-cm-deep]by 24-inch-dia meter[61-cm-d iameter]hole centered at the 5.3.5.Proceed with points 5.2.10 through 5.2.12 of the dry-hole sump location. installation instructions. 5.4.1.5.The required 12 inches[30 cm]of backfill bedding on the bottom 5.3.6.In high-water conditions,where itis notpossibleto maintain ofthe excavation must also be present in the excavation hole inwhichthe the water level below the top of the bedding material during the bottom sump orfitting will be placed. entire installation,partially ballast the tank to firmly seat the tank 5.4.1.6.After the tank is placed,manually tamp backfill in the into the bedding material and to keep it from floating.See section 5.5 for instructions. void surrounding the sump priortoadding backfillaround the tank. 5.3.7.The ballast level in the tank must either be lower than the S.S.BALLASTING TANKS(ADDING LIQUID) backfill material or less than 12 inches[30 cm]above the water level A WARNING in the hole.See Figure 5-2. Inert the tank and use inert gases(not air)to pressure test a tank that contains or has contained flammable or combustible liquids or vapors.Failure to follow this warning could result in an explosion, Liquid in tank must not be more than and could result in death or serious injury. _ 12 inches[30 cm]hTur a than water in the III = A WARNING excavation hole during installation. If flammable or combustible product is used as ballast,exercise IIII =a special care in handling.Safeguard against sparks,fire or product IIII— I-IIIII spills.Failure to follow this warning could result in a fire or an _ explosion,anIf could result in death or serious Injury. — — = A WARNING The tank must be adequately vented to prevent the development _ _ III—IIIII of vacuum or pressure when filling or emptying the tank.Failure to IIII— II — IIII— properly vent the tank could cause tank failure,and could result -IIIII=IIII III-IIIII in death orserious injury. S.S.I.GENERAL 5.3.8.Proceed with points 5.2.13 through 5.2.23 of the dry-hole 5.5.1.1.Typically,tanks should be pressure tested before ballasting. installation instructions. • Do not use atmospheric air when testing pressure-testable tanks 5.3.9.Ballastthe tank once the backfill is even with the top of the that have held flammable orcombustible product. tank.See section 5.5. • Use nitrogen or other inert gas when testing these tanks. 5.3.10.Proceed with points 5.2.25 through 5.2.30of the dry-hole 5.5.1.2.For mostanchoring systems,a tank is notadequately protected installation instructions. against flotation until the tank is fully backfilled and the top slab is in place. Therefore,during the installation process,the tank should be ballasted 5.4. BOTTOM SUMPS AND FITTINGS completely afterthe backfill is at least 75 percent of the way up the tank 5.4.1.GENERAL and after postinstallation testing has been successfully completed. 5.4.1.1.When handling a tankwith a bottom sump or fitting,always 5.5.1.3.Only underwet-hole conditions should ballast be added take extra care sothatthebottom sump orfittingisnotdamaged beforethebackfill is75percentofthewayupthetank.Seesection5.3. by contactwith any other object,such as the truck bed or the ground. 5.5.1.4.Care must be taken so that the use of ballast d oes not NOTE: During transportation and at the jobsite,tanks contaminatetheproductbeingstored.Thisisespecially important with bottom sumps must be cradled to avoid damage for potable water,chemical and diesel exhaustfluid(DEF)tanks. caused by allowing the tank to rest on the sump. 22 5: INSTALLING TANKS