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Subdi~on- Design Standards § 9.50.30 <br /> <br />Each test hole shall be six to eight inches in diameter, have <br />vertical sides and be bored or dug to the depth of the bottom of <br />the proposed individual sewage treatment system. <br /> <br />2. Each test hold shall be numbered and its location shall be <br /> <br /> plotted on a scale map of the real <br /> <br />3. Soil texture descriptions shall b4 <br /> where texture changes occur. <br /> <br /> The bottom and sides of the <br /> to remove any smearing and to <br /> into which water may ~ <br />5. loose material shall be <br /> st hole and two inches of <br /> ed to protect the bottom <br /> <br />o <br /> <br /> or building site. <br />recorded, noting depths <br /> <br />be carefully scratched <br />a natural soil surface <br /> <br /> from the bottom of the <br />to 3/4 inch gravel shall be <br />scouring. <br /> <br /> role shall be caref, <br />nx' depth of 12 <br />test and <br /> <br /> filled with clear water to a <br />over the soil at the bottom of the <br />no less than four hours. <br /> <br />The soil then be <br />more than 0 hours. <br />shall not be <br />the hole has <br /> <br /> to swell for least 16, but no <br />sandy soils, the swelling procedure <br />the test may proceed if one filling of <br />in less than ten minutes. <br /> <br />8. In sandy soils a, the water depth to eight inches over the <br /> soft at the bottol of the test hole. From a fixed reference <br /> point, the drop level shall be measured in inches to <br /> the nearest 1/1 at approximately ten minute intervals. <br /> A measuremel can a~so be made by determining the time it <br /> takes for the/ ter lev'e,1 to drop one inch from an eight inch <br /> reference p~r If eighk, inches of water seeps away in less <br /> than ten m/Inutes, a shor~r interval between measurements <br /> shall be u~ed, but in no c~se shall the water depth exceed <br /> eight inches. The test shall~continue until three consecutive <br /> percolat~n rate measuremen~ vary by a range of more than <br /> ten perlent. ~ <br />9. In other soils, adjust the water d~pth to eight inches over the <br /> soil ~/~ .the.bottom of the test hol~ From a fixed reference <br /> poi:.~]/, the drop in water level shall~Qe_ measured in inches to <br /> the ~earest 1/16 inch at approximat~y 30 minute intervals, <br /> ret lling between tests to maintain A~ eight inch starting <br /> he Ld. The test shall continue unt~ three consecutive <br /> lati)n rate measurements var), by k~range of no more <br /> ten percent. The percolation rate can'-also be made by <br /> o ,serving the time it takes the water level to drop one inch <br /> 'om an eight inch reference point if a constant water depth <br /> of at least eight inches has been maintained for at least four <br /> hours prior to the measurement. <br /> <br />Printed 12/28/90 <br /> <br />Page 539 <br /> <br /> <br />