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<br />approximately 30 minute intervals, refilling between <br />measurements to maintain an eight-inch starting <br />head. The test shall continue until three consecutive <br />percolation rate measurements vary by a range of no <br />more than 10%. The percolation rate can also be <br />made by observing the time it takes the water level to <br />drop one inch from an eight-inch reference point if a <br />constant water depth of at least eight inches has <br />been maintained for at least four hours prior to the <br />measurement. <br /> <br />5. Calculating the percolation rate: <br /> <br />a. Divide the time interval by drop in water level to obtain <br />the percolation rate in minutes per inch. <br /> <br />b. Percolation rates determined for each test hole shall <br />be averaged to determine the final soil treatment <br />system design. <br /> <br />6. For reporting the percolation rate, worksheets showing <br />all calculations and measurements shall be submitted. <br /> <br />7. A percolation test shall not be run where frost exits <br />below the depth of the proposed soil treatment system. <br /> <br />17 <br />