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Page Number Five <br />in the vicinity. It is possible that the ground water table <br />will rise to within a foot or two of the ground surface. The <br />sand soils are very porous, and it is not considered practical <br />to attempt to pump water from the site in order to permanently <br />dewater the site, it will, however, be necessary to dewater the <br />site for construction. This can be accomplished by the use of <br />well points or by placing 4 to 6 wells, 20 to 30 feet deep, <br />around the outside of the pool and pumping from these wells. <br />Considerable quantities of water must be pumped continuously <br />to dewater the site. Once the site has been dewatered and the <br />excavation has been made, it is important that the water table <br />remain depressed until the funite has been placed. Otherwise <br />the sand from the soils of the pool will slough into the pool. <br />The sand soils encountered at this site are cohesion- <br />less materials and will, no doubt, slough into the excavation. <br />Some support will be necessary for the walls, such as sandbag- <br />ging, in order to maintain a stable condition for guniting. <br />After the pool has been completed and the water table <br />again rises, hydrostatic pressures will act on the bottom of <br />the pool tending to float the pool. It is, therefore, recom- <br />mended that relief valves be installed in the bottom of the <br />pool to protect the pool against this condition. In order that <br />the relief valves may effectively operate, it is considered <br />advisable to place a thin layer of gravel in the bottom of the <br />pool beneath the gunite floor slat,. <br />REINARD W. BRANDLEY (SIGNED) <br />REINARD W. BRANDLEY <br />RWB:rk;dw