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L <br /> LNovember 9,2005 <br /> NOA Project Number: E05118B <br /> L6.3 Boring Preparation and Presaturation <br /> L The soil borings were advanced on the Site with a hand augur on September 27, 2005. <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 /> L bottom of the open soil boring,then the PVC pipe was installed on top of the gravel. "Pea gravel' <br /> was used to backfill in the annular space. <br /> L Presaturation of the percolation test hole occurred on September 27, 2005.The depth of water used <br /> 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 holes were found to be intact and dry on the day of <br /> Ltesting. <br /> 6.5 Percolation Test Procedure <br /> LThe percolation tests were conducted on September 28, 2005 in accordance with the requirements <br /> of the EHD. A percolation test with a duration of four hours was performed for each hole. The <br /> L final half-hour of the four-hour percolation tests were observed by Mr. David Van Dyne,Senior <br /> Registered Environmental Health Specialist,EHD. <br /> L Measurement of the water level during the percolation test was from a fixed 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 /> L 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 /> LThe completed percolation test forms are 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 /> L satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. <br /> Details of the percolation tests are summarized in Table 5. <br /> L <br /> L <br /> L 8 '404 <br /> L <br />