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L <br /> L April 9,2007 <br /> NOA Project Number. E07045A <br /> 6.0 PERCOLATION TEST INFORMATION <br /> i <br /> /6.1 Percolation Test Locations <br /> L A site map indicating the locations of the percolation test hole is included as Plate 1 in the appendix <br /> { of this report. <br /> L /6.2 Number of Percolation Tests <br /> ` One shallow percolation test was conducted on the site for a total of one percolation test. <br /> L /6.3 Boring Preparation and Presaturation <br /> A total of one soil boring was drilled with a hand-augur on March 26,2007. <br /> LA 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 then used to backfill in the annular space. <br /> L Presaturation of the percolation test holes occurred the same day of drilling. The depth of water <br /> used to pre-soak was 12 inches above the bottom of the borings. <br /> L /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 /> LPercolation tests were conducted for the borings on the site on March 27,2007 in accordance with <br /> the requirements of the EHD. A percolation test with a duration of four hours was performed for <br /> L the hole. The last half an hour was observed by Ms. Lisa Medina,Registered Environmental Health <br /> Inspector,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 /> ` holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the <br /> I4- bottom level of the percolation test hole. The readings were taken every 30 minutes for a period of <br /> four hours. <br /> L <br /> L 7 '001t4 <br /> L <br />