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5.226.1.Subtract Measurement#4 from Measurement#1 and mold 5.3.8.Proceed with POINTS 5.2.13. through 5.2.23.of the dry- it as the Deflection Measurement on the Tank Installation ChecMlst hole installation instructions. 5.2.29.Install reinforced concrete or asphalt,if used,at this 5.3.9.Ballast the tank once the backfill is even with the top of time.See SEC77ON 7.4. the tank.See SECTION 12. 5.2.29.1.The cover depth must meet the appropriate minimum 5.3.10.Proceed with POINTS 5.2.25. through 5.2.31, of the specified in SECTION 7.4. dry-hole installation instructions. 5.2.29.2.For installations in traffic conditions,all secondary 6. BACKFILL MATERIAL backfill used as subgrade backfill must be compacted with a hand-guided,vibrating-plate,mechanical compactor. 6.1. GENERAL 5.2.30.If the tank has a monitoring system,after backfilling is 6.1.1.Xerxes tanks shall be installed using select rounded completed and after top slab is in place(if used),perform nec- stones or crushed stones as primary backfill material.See essary monitoring checks.See SECTION 15. SECTION 6.2.for definition of primary backfill material. 5.2.31.Complete the Tank Installation Checklist. 6.1.2.Alternatively,Xerxes tanks shall be installed using pri- mary backfill vertically up to at least 75 percent of the tank di- 5.3. WET-HOLE INSTALLATION ameter and secondary backfill above the primary backfill.See 5.3.1.Follow the dry-hole installation instructions(SECTION SECTION 6.3.for definition of secondary backfill and Xerxes 5.2.)with the modifications listed below. Split Backfill Instructions,APPENDIX C,for more information 5.3.2.Perform POINTS 5.2.1. through 5.2.4.4.of the dry-hole regarding this alternative. installation instructions. 6.1.3.Using backfill material other than that specified in 5.3.3.Before performing POINT 5.2.5. of the dry-hole installa- POINTS 6.1.1.and 6.1.2.without prior written authorization tion instructions,pump water from the excavation hole and from Xerxes will void Xerxes'obligations under the limited continue pumping to maintain minimum water level during warranty. tank installation. CAUTION 5.3.3.1.Attempt to maintain the water level below the top of Using other than specified backfill material may cause tank the bedding materials until the tank can be fully backfilled and failure,or may result in damage to the tank and/or surround- ballasted. ing property. 5.3.4.Proceed with POINTS 5.2.5. through 5.2.9.1. of the dry- 6.2. PRIMARY BACKFILL hole installation instructions. 6.2.1.Primary backfill material must meet the following speci- 5.3.4.1.In high-water conditions,when Xerxes'preferred Man- fications: Out-of-Hole(MOH)anchoring method is not available or pos- 6.2.1.1. Material is to be clean,free-flowing,and free of dirt, sible,see SECTION 8.8.for an alternate method. sand,large rocks,roots,organic materials,debris,ice and 5.3.5.Proceed with POINTS 5.2.10. through 5.2.12.3.2. of the snow.Backfill material shall not be frozen or contain lumps of dry-hole installation instructions. frozen material at any time during placement. 5.3.6.In high-water conditions,where it is not possible to 6.2.1.2.An important characteristic of good backfill material is maintain the water level below the top of the bedding material hardness or stability when exposed to water or loads.Most during the entire installation,partially ballast the tank to firmly materials have no problem meeting the hardness requirement. seat the tank into the bedding material and to keep it from Materials like soft limestone,sandstone,sea shells or shale floating.See SECTION 12 for instructions. should not be used as backfill because they may break down over time. 5.3.7.The ballast level in the tank must either be lower than the backfill material or less than 12 inches above the water 6.2.1.3.When using select rounded stones,they must con- level in the hole.See FIGURE 5-2. form to the specifications of ASTM C 33,size numbers 6,67 or 7.See FIGURE 6-1 and Xerxes Primary Backfill Require- Liquid in tank must not exceed ments,APPENDIX B,for additional Information on backfill ma- water in hole by more than 12" terial specifications. III III Rounded Stone Crushed Stone IIII — _ �__- — II • I I II II Size numbers 6,67,7 Size numbers 7,9 I = FIGURE 5-2 FIGURE 6-1 10