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May 25, 2004 <br /> ` NOA Project Number: E0406 IA <br /> Page 10 <br /> ` communication, David Kaestner, May 25, 2004). <br /> ` 6.4 Percolation Test Procedure and Results <br /> A percolation test was conducted for each boring in accordance with the requirements of the <br /> ` EHD. Percolation tests with duration of 4 hours were performed. The last half hour of each <br /> 4-hour percolation test was observed by a representative of EHD. <br /> it Measurement of the water level during the percolation test was from a fixed reference point on <br /> the PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All <br /> tabulated values on the field data sheet (appendix) are in decimal feet. After water drop was <br /> 6. observed, the holes were checked for refill. The refill level was approximately 0.5 ft(6 inches) <br /> of water above the bottom level of the percolation test hole. The readings were taken <br /> approximately every 30 minutes for a period of 4 hours (personal communication, David <br /> Kaestner, May 25, 2004). <br /> A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth. A <br /> deep percolation test is defined as being between 42 inches and 25 feet in depth. A satisfactory <br /> percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. A <br /> satisfactory percolation rate for a deep test is less than or equal to 30 minutes per inch drop. <br /> ` Either one shallow or deep test must demonstrate a satisfactory percolation rate within the <br /> proposed septic system disposal field. A summary of the percolation tests is presented in Table <br /> 5. <br /> Table 5. <br /> _ <br /> Summary of Percolation Tests. <br /> Lot Test No., Percolation Percolation Rate Test Comment <br /> Number Date Tested Test Depth (minutes/inch) Duration (see notes) <br /> (ft) <br /> 31 PT 31-1 shallow, 3.4' Negative 4 hr Failed <br /> 5-7-04 percolation <br /> 31 PT 31-2 deep, 16.3' 7.8 4 hr Satisfactory percolation <br /> 517/04 rate <br /> 32 PT 32-1 deep, 12.8' 4.7 4 hr Satisfactory percolation <br /> 5/7/04 rate <br /> 32 PT 32-1 shallow, 3.4' 62.5 4 hr Failed <br /> 4/22/04 <br /> 33 PT 33-1 shallow, 3.3' 313 4 hr Satisfactory percolation <br /> ` 4/21/04 rate <br /> V "'44 <br /> L <br />