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4.9.4.I.This date that the vacuum was applied maybe used 5.2.2.Record this measure mentasMeasure mentklonthe Tank as a reference under this procedure to eva I u ate the tank's integrity Installation Checklist. priorto installation. 5.2.3.Locate the excavation site according to instructions in section 1. 4.9.4.2.Tanks shipped undervacuum must be undervacuum for 5.2.4.Prepare the excavation according to instructions in section 1 a minimum of 7 days.If this requirement is not met,a pressure soap and the following points: test is required. • When preparing the excavation,allow for an anchoring system 4.9.4.3.The tank shipped undervacuumshould beinstalled (if used)and geotextile fabric(if used).See section 1. and backfilled with the vacuum intact if both of the following • When preparing the excavation,allow forthe appropriate depth two conditions are met: of cover as specified in section 1. • installation of the tank is to begin 7 days or more afterthe factory • If two or more tanks are to be installed in the same excavation application of vacuum(as indicated on the shipping documents hole,follow instructions in section 1. and/or tank labels) • If the tank has a bottom sump orfitting,prepare the excavation • the vacuum gauge shipped with the tank reads 12 inches hole according to instructions in section 1. of mercury[40 kPa]or more 5.2.5.If an anchor slab is needed,install it now.See section 1. NOTE:Under certain field conditions(such as major changes 5.2.6.Where necessary,level the bottom of the excavation using in temperature,barometric pressure and/or altitude)and/or with primary backfill material,fillingel the bottny om of the excavee ation l certain equipment failure(such as freezing or sticking of gauge primary backfill mechanism),the vacuum-monitoring method may not be an for accurate enough test. 5.2.7.Geotextile fabric,if used,must be placed to separate the primary backfill material from all other in-situ soil and/or secondary 4.9.4.4.When in doubt,or when such conditions occur, backfill material.See section 1. see Pressure-Testing Sidebar for instructions on testing a dry, double-wall tank not under vacuum. 5.2.8.If deadmen are used,see section 1 for information on deadmen placement. 4.9.5. PRESSURE TESTING A DRY-MONITOR, • Ifdeadmenare used and theyaretobeplaced sothattheyareinthe DOUBLE-WALL TANK NOT UNDER VACUUM bedding or belowthe bottom ofthetank,place the deadmen before 4.9.5.1.See Pressure-Testing Sidebar for instructions. preparing the backfill bedding. 4.9.6. PRESSURE TESTING A DRY-MONITOR, 5.2.9.Prepare a 12-inch-thick[30-cm-thick]smooth,level bed of DOUBLE-WALLMULTICOMPARTM ENT TANK approved primarybackfill material on the bottom of the excavation NOT UNDER VACUUM or on top of slab.See section 1 for backfill requirements. NOTICE NOTICE Do not connect pressure source directly to the access fitting for If anchor straps are used,bedding must be carefully leveled. interstitial-space monitoring.Pressurizing the interstitial space by Failure to follow this notice could result in straps being too short itself could result in damage to the primary tank and/ortankfailure. or too long,which could result in property damage. 4.9.6.1.See Pressure-Testing Sidebar for instructions. NOTE: If the excavation has soft soil conditions or if there might be difficulties controlling water accumulation,it is acceptable to increase the bedding thickness as needed.Set the tank anchors 5: INSTALLING TANKS once the bedding thickness has reached a level 12 inches[30 cm] below the tank bottom elevation. 5.1.GENERAL 5.2.10.See section 2 regarding the use of lifting lugs to hoistthe tank S.I.I.Take safety precautions throughout the entire installation when unloading and installing it. process.See the Introduction. NOTICE 5.1.2.Use only approved backfill material.See section 1.2. Do not set tanks directly onto a concrete slab,timbers,cradles orin-situ soil.Failure to follow this notice could result in damage to the tank. 5.1.3.Do not mix approved material togetherwith sand or in-situ soil. 5.2.11.Place the tank ortanks onto the bed: • If deadmen are in place,centerthe tanks between them. 5.1.4.Do not use in-situ soil as primary backfill material. • Align the tanks with anchorsfor proper placement of anchorstraps. 5.I.5.Typically,all excavated in-situ soil must be replaced with • Asthetankis being placed,slope the tank according to site specifications. primary backfill material. • Sloping of tanks may affect accuracy of calibration charts. • If a double-wall tank is sloped,the monitorshould be at the low end 5.2. DRY-HOLE INSTALLATION in a tank with a dry interstitial space and atthe high end in a tankwith 5.2.I.Before beginning tank installation,take atank diameter a wet interstitial space. measurement.See section 1 for instructions. NOTE: We do not require that a tank be sloped.However,sloping the tank may be required by the tank owner's specifications. 20 4:TESTING DURING INSTALLATION/ 5: INSTALLING TANKS