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April 7, 2006 <br /> NOA Project Number: E06020A <br /> 6.3 Boring Preparation and Presaturation <br /> The soil boring was advanced with a hand augur on the Site on March 19, 2006. <br /> A 1.5-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. "Pea Gravel' <br /> was then used to backfill in the annular space. <br /> Presaturation of the percolation test hole occurred approximately 24 hours before the percolation <br /> ` tests. The depth of water used to pre-soak was 12 inches above the bottom of the boring. <br /> 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the presaturated hole was found to be intact and dry on the day of <br /> testing. <br /> 6.5 Percolation Test Procedure <br /> A percolation test for the Site was performed on March 20, 2006. The test was a duration of four <br /> hours and was performed in accordance with the requirements of the EHD. The final half-hour of <br /> the test was observed by Mr. Ted Tasiopoulos, Registered Environmental Health Inspector, EHD <br /> Measurement of the water level during the percolation test was from a fined reference point on the <br /> PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All tabulated <br /> values on the field data sheet (appendix) are in decimal feet. After water drop was observed, the <br /> holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the <br /> bottom level of the percolation test hole. The readings were taken approximately every 30 minutes <br /> for a period of four hours. <br /> 6.6 Percolation Test Forms and Results <br /> The completed percolation test form is included in the appendix of this report. <br /> A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth; a <br /> satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. <br /> Details of the percolation test are summarized in Table 4. <br /> 8 <br />