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Step 5. PREPARAI IJN OF THE BOTTOM SURFACE uF THE EXCAVATION The preparation of the excavation bottom is critical so the pool will fit properly. Thorough preparation will reduce settling, stress cracks and a minimize the amount of time will be spent setting and leveling the pool. First, install the 2" x4" master screed rail(s) length wise in the excavation, using wood or metal stakes (See Figure 4). Make sure the diagonal measure- mentisexactto insurethatthe bottom is square. Adjustthe masterscreed rail(s) to the appropriate height using atransitlevel (See Figure2). Next, install the remaining screed rail(s) parallel to the master screed rail(s) using the offset dimensions as shown in Figure 4and making sure thatthey are aligned to the Master screed rail(s) to insure that the bottom is square. Next, spread a layer of fill material approximately 4" deep evenly over the bottom of the excavation. Rakethefill material flatto thetop of the screed rails (See Figure 3). Compaction of the fill material is generally achieved byscreeding it into place, but depths ofgreaterthan4"will require use ofa platetamper. Rake and compactthe area until a stable base forthe shell is achieved. Screed the bottom of the excavation, filIinganylowspotsasyougo. Removethescreed rails andfill in the voids with fill material, being careful notto disturbthefill. NOTE: THE MEASUREMENTS PROVIDED BELOW ENABLE THE BUILDER TO SETTHE SHELL WITHIN A FEW INCHES OF LEVEL. LIFTTHE SHELL AND ADJUST THE BASE AS NECESSARY TO ACHIEVE LEVELNESS OF THE SHELL WITHIN THE INDUSTRY STANDARD. Figure 4 - Screed Rail Dimensions SEE SECTION A -A 16' 38' 4TAKFS NOTE: POOL SHELL MUST DIG LI REST SOLEY ON SAND. 38, 3"-4" OVER DIG ,2" x 4" SCREED BOARD FINISH 31'-1" SUMP SYSTC I I �- STAKE 3"-4" OVER DIG SAND BED STAKE Step 6. SETTING THE POOL Upon arrival/delivery of your pool shell, be sure to inspect the pool for damage that may have occurred during transportation and for conformity to order specifications. The recommended method of setting the pool shell is by making use of a crane or boom truck. A track -mounted excavator can be used to lower the pool into the excavation, but directions should be obtained from Latham prior to setting the shell. Please note that Latham recommends lifting all pool models over 12' wide with a spreader bar and 20' lifting straps. Once the pool is set in the excavation, the pool should be checked for level and the bottom should be walked over to detect any voids in the fill material that might be present. The pool is then lifted and reset as many times as necessary to achieve a "good fit" A good fit is realized by raking the surface of the fill material in order to see where the pool's perimeter is touching (footprint) and by walking around on the inside of the pool to detect low spots. It is normal to feel a slight void under the center of the pool, but walking in the pool should cause the floor to rest on the bed of fill material. The pool shell will conform to the base material under the weight of the water. It is important to make certain that the bottom, perimeter, and all transition points are sitting firmly upon the bed of fill material. The pool can be separated from the lifting equipment when the entire perimeter of the pool (including all transitions) is level within the industry guidelines.