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n <br /> September 30, 2007 <br /> NOA Project Number: E07146A <br /> j 6.0 PERCOLATION TEST INFORMATION <br /> J / 6.1 Percolation Test Locations <br /> A site map indicating the locations of the percolation test holes is included as Plate 1 in the appendix <br /> of this report. <br /> Px/6.2 Number of Percolation Tests <br /> t ' Two shallow percolation tests were conducted on the site for a total of two percolation tests. <br /> [[ x/6.3 Boring Preparation and Presaturation <br /> F! A total of two shallow borings were drilled on the site. The botings were excavated on the site with <br /> a hand augur on September 4, 2007. <br /> 1 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 graver, <br /> was then used to backfill in the annular space. <br /> Presaturation of the percolation test hole occurred 24 hours prior to the percolation tests. The depth <br /> I` of water used to pre-soak was 12 inches above the bottom of the borings. <br /> j/6.4 Condition of Borings After Presaturation <br /> F <br /> After the 24-hour soak period,the presaturated holes were found to be intact and dry on the day of <br /> testing. <br /> d6.5 Percolation Test Procedure <br /> Percolation tests were conducted for the shallow borings on September 5,2007 in accordance with <br /> the requirements of the EHD. A percolation test with a duration of four hours was performed for <br /> �-. the holes. The last half an hour was observed by Ms. Lisa Medina, Senior Registered Environmental <br /> Ij Health Inspector, EHD. <br /> 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 /> bottom level of the percolation test hole. The readings were taken every 30 minutes for a period of <br /> four hours. <br /> ( <br /> -44 i <br />