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2 <br /> %ftw .-le <br /> B. From a fixed reference point, measure the drop in water level at 30 minute intervals fo1'four <br /> 4 hours, refilling 6 inches over the gravel as necessary. <br /> C. Use the smallest reading of the four hour period to calculate percolation rate in "minutes per <br /> inch." <br /> VII. Procedure #3- in sandy soils (or other soils) in which the first 6 inches of water seeps away in less <br /> than 30 minutes after the overnight saturation period. <br /> A. Refill the hole to approximately 6 inches above the gravel. <br /> B. From a fixed reference point, take the readings 10 minutes apart over a one hour period. <br /> C. Use the smallest reading change,calculate percolation rate in minutes per inch. <br /> VIII. At the time of percolation test Environmental Health Staff will: <br /> A. Review application and parcel map for accuracy and correctness. <br /> B. Observe raw field data, recorded prior to arrival. <br /> C. Observe and document on EHD "Percolation Test Application" the readings during the final <br /> 30 minutes of the test. <br /> D. Correct any data on the application and sign the percolation record sheets. <br /> Source:Manual of Septic Tank Practice,U.S.Dept.of H.E.W.(1967),as foundation and modified for San Joaquin County. <br />