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system(if used)and geotextile fabric(if used).See SECTIONS f Air-test Monitoring of Secondary Tank 7.2., 7.3.and 7.4. (dry interstHial space) ;• 5.2.4.2.When preparing the excavation,allow for the appropri- ate depth of cover as specified in SECTION 7.4. 5.2.4.3. If two or more tanks are to be installed in the same ex- cavation hole,follow instructions in SECTION 7.5. !' i FIGURE 4-4 5.2.4.4.If the tank has a bottom sump or fitting,prepare the 4.5.7.Soap the entire exterior of the tank.See SECTION 3.7. excavation hole according to instructions in SECTION 10. 4.5.8. Hold and monitor the pressure for a minimum of 1 hour. 5.2.5. Remove all loose material from the excavation. 4.5.9.Carefully release the air pressure from the tank.See 5.2.6.Where necessary, level the bottom of the excavation SECTION 3.9. using primary backfill material,filling in any low areas.See SECTION 6 for backfill requirements. 4.5.10. Remove the test manifolds and replace the protective covers in the service fittings. 5.2.7. If an anchor slab is needed, install it now.See POINT 7.5.3.3. and SECTION 8.6. 5. INSTALLING TANKS 5.2.8. If geotextile fabric is to be used, place it in the excava- ® WARNING tion hole at this time.See SECTION 9. 52.8.1.Geotextile must be placed to separate the primary If product is used as ballast,exercise special care in han- dling. backfill material from all other in situ soil and/or secondary Safeguard against sparks,fire or product spills.Im- proper handling of product could cause a fire or explosion backfill material. and could result in death or serious injury. 5.2.9. If deadmen are used,see SECTION 8 for information on ® WARNING deadmen placement and place them now. Do not use air pressure to test tanks that contain or have 5.2.9.1. If deadmen are used and they are to be placed so that contained flammable or combustible liquids or vapors.The they are in the bedding or below the bottom of the tank,place fuel and air mixture could explode and could result in death the deadmen before preparing the backfill bedding. or serious injury.Tanks should be air tested before ballast- ing. See SECTION 12. 5.2.10. Prepare a 12-inch-thick smooth, level bed of approved primary backfill material on the bottom of the excavation.See NOTICE SECTION 6 for backfill requirements. Adequately ballast the tank(add liquid)in a wet hole or in a NOTICE dry hole that may become wet(for example,from site runoff) until the installation is totally completed.Failure to do this If anchor straps are used, bedding must be carefully leveled. may result in damage to the tank and/or surrounding property. Failure to follow this notice may result in straps being too 5.1. GENERAL short or too long,and may result in property damage. 5.1.1.Take safety precautions throughout the entire installation 5.2.10.1. If the excavation has soft soil conditions or if there process.See SECTIONS 1.1.and 7.1. might be difficulties controlling water accumulation, it is ac- ceptable to increase the bedding thickness to 18 inches and 5.1.2. Use only approved backfill material.See SECTION 6. set the tank anchors 6 inches off the bottom of the excavation 5.1.3. Do not mix approved material together with sand or in (9 inches for 10-foot-diameter tank deadmen). situ soil. 5.2.11.See SECTION 2 regarding the use of lifting lugs to 5.1.4. Do not use in situ soil as primary backfill material. hoist the tank when unloading and installing it. 5.1.5.Typically, all excavated in situ soil must be replaced with 5.2.12. Place the tank or tanks onto the bed, primary backfill material. 5.2.12.1.If deadmen are in place,center the tanks between them. 5.2. DRY-HOLE INSTALLATION NOTICE 5.2.1. Before beginning tank installation,take a tank diameter measurement.See SECTION 11 for instructions. Do not set tanks directly onto a concrete slab,timbers, cradles or in situ soil. Failure to follow this notice may result 5.2.2. Record this measurement as Measurement 41 on the in damage to the tank. Tank Installation Checklist. 5.2.12.2.Align the tanks with anchors for proper placement of 5.2.3. Locate the excavation site according to instructions in anchor straps. SECTIONS 7.1.and 7.2. 5.2.12.3.As the tank is being placed,slope the tank according 5.2.4. Prepare the excavation according to instructions in to site specifications. '.. SECTION 7. NOTE:Xerxes does not require that a tank be sloped.The 5.2.4.1.When preparing the excavation,allow for an anchoring slope is determined by the tank owner's specifications. 8