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SECTION 4: EXCAVATION
STEP 1: THE BACKHOE OR GRADALL IS THE BEST PIECE OF EQUIPMENT WITH WHICH TO EXCAVATE THE POOL. DIG THE HOLE T0 A DEPTH OF 42' BELOW THE HIGH POINT SELECTED AS THE TOP OF THE POOL. AT THE 42" DEPTH TIlE GROUND MUST BE LEVEL AS THIS WILL PROVIDE A UNIFORM BASE FOR THE POOL WALLS. IF YOU RUN INTO ROCK, SHALE, HEAVY ROOTS, WATER, OR ANY OTHER ABNORMALITIES DURING EXCAVATION, CONTACT YOUR LOCAL DEALER BEFORE ATTEMPTING TO GO FURTHER.
IN THE CASE OF WATER CONDITIONS, REFER TO THE SECTION ON MAIN DRAIN INSTALLATION IN THE BACK OF THIS MANUAL.
STEP 2: WITH THE EXCAVATION NOW AT THE 42" LEVEL. THE POOL WALLS AND HOPPER MUST BE LAID OUT. LAYOUT THE POOL WALLS IN THE SAME MANNER AS SHOWN IN FIGURE 3. INSTALL THE REE-BAR AT THE CORNERS AN RUN A STRING BETWEEN THEM. THIS IS THE LINE THE POOL WALLS WILL FOLLOW. WE ARE USING REE-BARS BECAUSE WE WILL ERECT THE WALLS AROUND THESE BARS WHICH WILL SERVE TO LOCATE THE INSIDE CORNERS UNTIL WE ARE READY FOR SAND OR A HARD BOTTOM.
IN ORDER FOR THE EXCAVATOR TO DIG AN ACCURATE HOPPER, THE HOPPER SHOULD BE OUTLINED PRIOR TO ITS EXCAVATION AS SHOWN IN FIGURE 4. AFTER THE STAKES ARE
LOCATED, THE HOPPER IS TO BE OUTLINED WITH CHALK OR FLOUR. THE STAKES REMAIN IN PLACE FOR USE IN GRADING AND FINISHING THE HOPPER BY HAND. FIGURE 5 SHOWS THE FINISHED HOPPER DIMENSIONS FOR EACH SIZE POOL. THE HOPPER IS ALWAYS DUG DEEPER THAN THE FINISHED HOPPER DIMENSIONS TO ALLOW FOR THE TYPE OF BASE MATERIAL BEING USED. FOR EXAMPLE: A PACKED SAND BOTTOM SHOULD BE 2" AND A CEMENT AND VERMICULITE BOTTOM SHOULD BE AS THE MANUFACTURER OF THE BASE AGGREGATE SUGGESTS.
FABRICATE A HOPPER BOTTOM PATTERN USING 1" x 2" LUMBER_ THE PATTERN IS PUT INTO THE HOPPER AND HELD WITH STAKES AT EACH CORNER AS SHOWN IN FIGURE 6. DO NOT ANCHOR THE FRAME TO THE CORNER STAKES AT THIS TIME.
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