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r <br /> HF'F 9 09-c. E'=C F:LEH'_Dr;;TOPd 415 46:3 0648 P. <br /> i <br /> T0: ENVIRONMENTAL HEALTH STAFF. <br /> FROM: C. LELAND HALL , R.S. , Directs' <br /> RE' <br /> PERCOLATION TEST PROCEDURE <br /> DATE: SEPTEMBER 6, 1984 <br /> I. Measurements of the Percolation Test- Hole. <br /> A. Diameter <br /> m 4 inches to 12 inches. <br /> B. Depth • of leach field - 36 inches. <br /> 11. Preparation of the Test Note. soil surfaces. <br /> A. Scratch or score sides to remove any smeared <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 addincl water a minimum u-( <br /> 12'" over gravel. <br /> IV. Procedure Al - if water remains in the test hole overnight• <br /> A. 24 hours after water is fistadded the <br /> hol . add clear <br /> water to approximately 6 inches <br /> rcolation rate over <br /> a. From a fixed reference point, measure the pe <br /> a thirt 30 minute Deriad. <br /> C. Cdlculate the percolation rate iii minutes per inch. <br /> V. Pr•ocedur #'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 /> in <br /> Blevel• From a fixed reference point. measure the <br /> !Ourdr4i hhoo_u_rs,erefillingt <br /> approximately all minute interv <br /> _ 6 inches over the gravel as necessary. period <br /> C. Use the reading during the last 30minuteperfinch.to�►r hour <br /> to talc ate percolation rate in minutes <br /> V1. Procedur M3 in sandy soils (or other <br /> soiltesafter) n whwhich the ghtst 6 swelling� <br /> of water away in less than 30 <br /> period. <br /> A. Refill the hole to approximately 6 inches above the gravel • <br /> B. Take the readings ©Yer d ng� d' <br /> C. Use the reading obtained during the last 10 minutes to calculate <br /> percolation rate in minutes per <br /> ource: Manual of Septic Tank Practice, U. S. Dept• of ii.E-N. (1967) <br />