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...- - <br /> PUBLICHEAITSERVI"CES <br /> SAN JOAQUiN COUNTY <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009 . (1.601 East Hazelton Avenue) Stockton, California 95201 <br /> C4�/F6�ita�P <br /> (209) 468-3400 <br /> PERCOLATION TEST PROCEDURE <br /> I _ Meaat_irementa of ti1e Peex•colation Test Hole. <br /> A. Diameter = 4 inches to 12 i-riches <br /> B. Denth = of leach field - 36 Inches . <br /> II . Preparation of the 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 #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) Min,Ate peri��. <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 /> approximateIr 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 ptercolation rate in minutes per inch. <br /> VI . Procedure 11;3 - In candy sails (or other .,odes) in which the fi_rrs-t 6 <br /> Inches of water seeps away in lees -than 30 minutes after the overnight <br /> swelling period. <br /> A . Refill. the hole to approximately 6 inches above the gravel . <br /> B. TUk the rcadi.nLc :l0 mj._ tul:s�j. 1; fir• a one hoar per_i,Qd. <br /> C . Dse trnf• read-1ng ob rained during, the last; 10 minutes to calculate <br /> Perco"at;:ion 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 loayuin County Health Care Services 40 <br />