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5.3.WET-HOLE INSTALLATION 5.4.1.2.When installing a large bottom sump in a water or wastewater 5.3.1.Follow the dry-hole installation instructions(in section 5.2) tank,see the Large Bottom Sump Installation Instructions supplement. with the modifications listed. See the Introduction for details on where to obtain this supplement. 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 the tank.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 the excavation that is large enough to accommodatethe 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-i nch-dia meter[61-cm-diameter]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 it is not possible to maintain of the excavation must also be present in the excavation hole in which the 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 void surrounding the sump priorto adding backfill around the tank. for instructions. 5.3.7.The ballast level in the tank must either be lower than the 5.5.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 Figure 5-2 orvapors.Failure to follow this warning could result in an explosion, Liquid in tank mugst not be more than = and could result in death or serious injury. VIII_VIII 12 excavation hole during nst Ilationherthan water in the VIII=VIII A WARNING —VIII= —VIII If flammable or combustible product is used as ballast,exercise VIII-VIII VIII-VIII special care in handling.Safeguard against sparks,fire or product —VIII=I —VIII spills.Failure to follow this warning could result in a fire or an VIII-VIII __ __ VIII-VIII explosion,and could result in death or serious injury. VIII-11 - __ II=VIII A WARNING VIII—VIII — IIII —VIII The tank must be adequately vented to prevent the development VIII-III — — _ III-VIII of vacuum or pressure when filling oremptying thetank.Failureto MITE III — — IIII = IIII properly vent the tank could cause tank failure,and could result °��° 0 IIII—VIII in death or serious injury. =VIII-I I 00000 000a°a0000000a00000ao o° a — ° °0000°°°000°°°°°°°°°°°°°°°° — — 5.5.1.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.Ballast the tank once the backfill is even with the top of the that have held flammable or combustible 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 5.2.30 of the dry-hole 5.5.1.2.For most anchoring systems,a tank is not adequately 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 after the 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 tank with a bottom sump orfitting,always 5.5.1.3.Only underwet-hole conditions should ballast be added take extra care so that the bottom sump orfitting is not damaged before the backfill is 75 percent of the way up the tank.See section 5.3. by contact with 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 does not NOTE: During transportation and at the jobsite,tanks contaminate the product being stored.This is especially important with bottom sumps must be cradled to avoid damage for potable water,chemical and diesel exhaust fluid(DEF)tanks. caused by allowing the tank to rest on the sump. 22