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<br />In sandy soils containing little or no clay, the swelling <br />procedure shall not be required and the test may be made as <br />described under item (c) (5) (cc) after the water form one <br />filling of the hole has completely seeped away. <br /> <br />5. Percolation rate measurement. With the exception of <br />sandy sOils, percolation rate measurements shall be made <br />on the day following the procedure described under item <br />(c) (4). <br /> <br />aa. If water remains in the test hole after the overnight <br />swelling period, the depth shall be adjusted to approximately <br />6 inches over the gravel. From a fixed reference point the <br />drop in water level shall be measured over a 30 minute period. <br />This drop shall be used to calculate the percolation rate. <br /> <br />bb. If no water remains in the hole after the overnight <br />swelling period, clear water shall be added to bring the <br />depth of water in the hole to approximately 6 inches over <br />the gravel. From a fixed reference point the drop in <br />water level shall be measured at approximately 30 minute <br />intervals for four h011rs, refilling 6 inches over the gravel <br />if necessary. The drop that occurs during the final 30 <br />minute period shall be used to calculate the percolation <br />rate. <br /> <br />cc. In sandy soils or other soils in which the first 6 <br />inches of water seeps away in less than 30 minutes after <br />the overnight swelling period, the time interval between <br />measurements shall be taken as 10 minutes and the test <br />shall be used to calculate the percolation rate. <br /> <br />6. A modification of the percolation test may be used where the <br />I,ercolation test procedure has been previously ~sed and know- <br />ledge is available on the character and uniformity of the soil. <br /> <br />Table 1: Absorption Area Requirements for Private <br />Residences and Other Establishments <br /> <br />(Per Bedroom CoIUTIh~ Provides for Residential Garbage Grinders <br />and Automatic Sequence Washing Machine~) <br /> <br />Percolation rate <br />(Time required for <br />water to fall 1 inch <br />in minutes) <br /> <br />Required Absorption <br />area in square feet <br />standard trench and <br />seepage pits <br /> <br />Per <br />. bedroom <br /> <br />Per gallon of <br />waste per day <br /> <br />1 or less <br />2 <br />"), <br />-' <br /> <br />70 <br />85 <br />100 <br />115 <br />125 <br />165 <br />190 <br /> <br />.20 <br />.30 <br />.35 <br />.40 <br />.45 <br />.65 <br />.80 <br /> <br />4 <br />5 <br />10 <br />15 <br /> <br />1/L <br />