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<br />2. Preparation of the test hole: <br /> <br />b. The bottom and sides of the hole shall be carefully <br />scratched to remove any smearing and to provide a <br />natural soil surface into which water may penetrate. <br /> <br />3. Soil Saturation and swelling: <br /> <br />a. The hole shall be carefully filled with clear water to a <br />minimum depth of 12 inches over the soil at the <br />bottom of the test hole and maintained for no less <br />than four hours. <br /> <br />b. The soil shall then be allowed to swell for at least 16, <br />but no more than 30 hours. In sandy soils, the <br />saturation and swelling procedure shall not be <br />required and the test may proceed if one filling of the <br />hole has seeped away in less than ten minutes. <br /> <br />4. Percolation rate measurement: <br /> <br />a. In sandy soils, adjust the water depth to eight inches <br />over the soil at the bottom of the test hole. From a <br />fixed reference point, the drop in water level shall be <br />measured in inches to the nearest one-eighth inch at <br />approximately ten minute intervals. A measurement <br />can also be made by determining the time it takes for <br />the water level to drop one inch from an eight inch <br />reference point. If eight inches of water seeps away <br />in less than ten minutes, a shorter interval between <br />measurements shall be used, but in no case shall the <br />water depth exceed eight inches. The test shall <br />continue until three consecutive percolation rate <br />measurements vary by a range of no more than 10%. <br /> <br />b. In other soils, adjust the water depth to eight inches <br />over the soil at the bottom of the test hole. From a <br />fixed reference point, the drop in water level shall be <br />measured in inches to the nearest one-eighth inch at <br /> <br />16 <br />