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Mr.Jim Hoagland <br /> January 19,2004 <br /> Page 10 <br /> A 2-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of <br /> water in the percolation test boring. Approximately 2 inches of"pea gravel"were placed in the <br /> bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. Several feet <br /> of"pea gravel"were backfilled in the annular space. <br /> 6.3 Presaturation of Borings <br /> Presaturation of the percolation test holes occurred on January 5, 2004. The depth of water used (G•3) <br /> to pre-soak was 12 inches above the bottom of the borings. After the 24-hour soak period, the Y <br /> presaturated holes were found to be intact and dry on January 6, 2004. 4od- <br /> 4WCAOI <br /> 6.4 Percolation Test Procedure and Results Ljp'4j <br /> A percolation test was conducted for all the borings on January 6,2004 in accordance with the <br /> requirements of the EHD. A percolation test with duration of 4 hours was performed. The last 61 �) <br /> half hour of the 4-hour percolation tests was observed by Mr. Michael Escotto, Environmental <br /> Health Inspector, EHD. <br /> 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 /> 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. <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 /> one <br /> SDE RSO <br /> v ti <br />� D N <br /> Z ' <br /> O � <br /> P <br />