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PUBLIC HEALTH SERVICES oPAWN. � <br /> .oG <br /> SAN JOAQLIIN COUNTY <br /> r � a <br /> J( I KIIANNA RLI).,NIT.H. " dl< < <br /> G <br /> Health officer <br /> P.U. Box 2009 . (1601 Last Hazelton Avenue) . Stockton, California 95201 �ejFOA`' <br /> (209) 468-3400 <br /> PERCOLA'T'ION TEST PROCEDURE <br /> I . Meanuremout.a of the Percolation Test Hole. <br /> A. Diameter = 4 inchea -to 12 inches <br /> B. DepLit = of leach field -- 36 inches. <br /> 11 . Preparation of the Test Hole. <br /> A. Scratch or score csides to remove any smeared soil surfaces . <br /> B. Remove loose material from hole. <br /> C. Add 2 inches of course sand or fine gravel . <br /> III . Saturation. <br /> A. Presoak Test Hole 24 hours before test by adding water a minimum <br /> of 12" over gravel. <br /> IV. Procedure #1 - if water remains in the test hole overnight. <br /> A. 24 hours after water is first added to the hole, add clear water <br /> to approximately 6 inches over the gravel. <br /> B. From a fixed reference point, measure the percolation rate over <br /> a thirty ( 30) minute ae_riod. <br /> C. Calculate the percolation rate in minutes per inch . <br /> V. Procedure 112 - if no water remains in test hole overnight. <br /> A. Add clear wager to bring depth of water in the hole to <br /> approximately 6 inches over gravel . <br /> B. From a fixed reference point, measure the drop in water level at <br /> approximately 30 minute intervals for four (4) hours, refilling <br /> 6 Inches over the gravel as nocessary . <br /> C. Use the reading during the last 30 minutes of the four hour <br /> period to calculate percolation rate in minutes per inch. <br /> VI . Procedure 113 - in candy Qoll.0 (or other sollo) in which the first 6 <br /> Inches of writer reepu away in lees than 30 minutes after the overnight <br /> Bwelling perlod. <br /> A. Refillthe hole to approximately 6 inches above the gravel . <br /> B. Take the readirtgru 10 m;LjLU&a ap r4 over a one hour Period. <br /> C. Use the reading obl;ained during the last 10 minutes to calculate <br /> percolation rate in minutes per Inch. <br /> c <br /> Source_ Manual of Septic Tank Practice, U.S. Dept. of H.E.W. ( 1967) <br /> EH 05 10 9/84(90) - Procedure <br /> ' A Division of San fnayuin County Heahh Care Services <br />