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A properly prepared hole should not re.,.,ire the filling of large voids beneath the pool. windly adding fill material beneath a pool can cause more harm than good. It is important that any adjustments to the pool's elevation be made before water is added. If the hole was properly prepared, nothing more than a few minor adjustments should be needed. LIFTS SHOULD BE PERFORMED IN COMPLIANCE WITH ALL APPLICABLE STANDARDS SUCH AS OSHA AND ASME. SPECIFIC STANDARDS THAT MAY BE APPLICABLE ARE LISTED BELOW. THIS IS NOT AN ALL-INCLUSIVE LIST AND OTHER REGULATIONS WHICH MAY APPLY DEPENDING HOW LIFT IS PERFORMED AND EQUIPMENT USED. ASME B30.5 OSHA 29 CFR 1910.133 OSHA 29 CFR 1910.179 OSHA 29 CFR 1910.180 OSHA 29 CFR 1926,753 IT IS THE RECIPIENT'S RESPONSIBILITY TO PROPERLY ASSESS THE SITUATION AND ACCOUNT FOR VARIABLES SUCH AS, BUT NOT LIMITED TO WEATHER, EQUIPMENT CONDITION, LOCAL REGULATIONS, ETC. BEFORE OFFLOADING CAN OC- CUR. ANY DAMAGE RESULTING FROM THE LIFTING OF THE POOL SHELL IS THE RECIPIENT'S RESPONSIBILITY TO BEAR Step 7. WATER AND BACKFILL As backfill material is initially placed around the pool shell, care should be taken to ensure that the wall -floor and step -floor ra- diuses are tightly packed with fill material, his process is referred to as "locking in" the shell. Once the pool shell is "locked in," the fill/backfill process can continue. It is very important that the radiuses of the pool are properly compacted. Poorly packed radiuses can result in hairline cracks and/or structural cracks due to deflection. Be sure to backfill slowly and thoroughly. Begin by filling the pool with 12" of water (measured at the deep end of the pool) and then while continuing to fill with water, maintain the level of the backfill material to be approximately 6" below the level of the water. As the water approaches the shallow end, pay particular atten- tion to all the unsupported areas of the pool. Steps and benches tend to flex, so slight adjustments may need to be made with the levering device. Be sure you wait until a sufficient amount of water surrounds the area (usually 12") to keep the rest of the pool in place, or you may raise more than you intend. The walls of the pool may deflect inward if too much backfill has preceded the water in the pool, or outward if too much water precedes the backfill. If deflection does occur during the installation, the only remedy is to dig that area out and proceed cor- rectly. A string line is very useful in determining the straightness of the pool walls during the backfilling process. To mitigate the stress under steps, tanning ledges, and some seats potentially induced on the pool shell as a result of backfill settling, Latham recommends either a shallow dig under large steps, tanning ledges, and some seats (Figure 6) or in the event of an over -dig, the installation of concrete masonry unit (CMU) piers placed under the steps, integral tanning ledges and/or swim outs, and some seats may be needed (Figure 7). Figure 6 - Minimal Dig Stair Detail 4 �•� l i �I I II � II I I� I � II I II � II I II I I 3' THICK COMPACTED SANDOR )5-CLEAN GRAVEL (TYPICAL( FIBERGLASS 4' MIN. THICK COMPACTED POOL SHELL GRAVEL FOR CLAY (ADOBE) SOIL ONLY. FILL MATERIAL BASE MATERIAL Figure 5 - Backfill Detail W LEVER ASSEMBLY FIBERGLASS POOL SHELL NATURAL GROUND WATER 6" COMPACTED FILL 6- Figure 7 - CMU Pier Stair Detail `i