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PUBLIC HEALTH SERVICES oR4�lN .� <br /> SAN JOAQUIN COUN'I'Y <br /> JOGI KHANNA I►I.D.,M.P.H. ~ M < <br /> Health Officer <br /> P.O. Box 2009 . (1601 Last Hazelton Avenue) . Stockton,California 95201 <br /> (209) 468-3400 <br /> PERCOLATION TEST PROCEDURE <br /> I . Naaaurements of the Pox-colati.on Test Hole. <br /> A. Diameter. = 4 inchen -to 12 inches <br /> B. Depth = of leach field - 36 inches. <br /> II . 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 period. <br /> C. Calculate the percolation rate in minutes per inch. <br /> V. Procedure #2 - if no mater remains in test hole overnight. <br /> A. Add clear water 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 necessary. <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 It3 - in sandy soils (or other soils) in which the first 6 <br /> Inches of waiver seeps away in leas than 30 minutes after the overnight <br /> swelling period. <br /> A. Refill. the hole -to a. j.)proxi.wately 6 inches above the gravel. <br /> B. 'Fake the readi.ngn 10 m:lnnll.i-ca -P rt over a one hour period. <br /> C. Use the reading obtained during the last 10 minutes to calculate <br /> percolation rate in minutes Per :Inch. <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 Joaquin County Health Care Services 40 <br />