Laserfiche WebLink
PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> x <br /> Joel KIIANNA M.D.,M.P.H. <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 . Measurements 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 t-)re Test Hole. <br /> A. Scratch or score sides 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 S1 - 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 if2 - 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 of the four hour <br /> period to calculate percolation rate in minutes per inch. <br /> VI. Procedure if3 - in sandy soils (or other soils) in which the first 6 <br /> inches of water seeps away in less than 30 minutes after the overnight <br /> swelling period. <br /> A. Refill the hole to approximately 6 inches above the gravel. <br /> B. Take the readings 10 Min l on apart: 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) - PrnrPrhjro <br />