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PUBLIC HEALTH SERVICES o� <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA MD.,M.P.H. I� <br /> Health Officer <br /> P.O. Box 2009 . (1601 East Hazelton Avenue) • Stockton,California 95201 <br /> (209) 468-3400 <br /> PERCOLATION TEST PROCEDURE <br /> I _ Meamurementn of the Percolation Test Hole. <br /> A. Diameter. = 4 inches -to 12 inches <br /> B. Depth = of leach field -- 36 inches . <br /> II . Preparation of -the Test; Hole . <br /> A. Scratch or score sides to remove any csmeared 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 Perii.Qd,. <br /> C. Calculate the percolation rate in minutes per inch. <br /> V. Procedure #2 - if no water 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 ofthe four hour <br /> period to calculate percolation rate in minut s per inch. <br /> VI . Procedure #3 - in sandy soils (or other soils) in which the first 6 <br /> inches of water seeps away in less man 30 minutes after the overnight <br /> swelling period. <br /> A. Refill. the hole to approximately 6 inches above the gravel . <br /> D. Take -the readings 10--miuu1es. , 1_over a one, hour period. <br /> C. Use the reading obtained during the last 10 mi tea to calculate <br /> percolation rate .in minutes per inch. <br /> Source_ Manual of Septic Tank Practice, U. S. Deet. of H.E.W. ( 1967) <br /> EH 05 10 9/34(90) - Procedure <br /> A Division of San Joaquin County Health Care Services <br />