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0 <br /> F1 March 28, 2007 <br /> NOA Project Number: E06122A <br /> r 6.2 Number of Percolation Tests <br /> 1 <br /> i <br /> Two shallow and two deep percolation test were conducted on the Site. <br /> 6.3 Boring Preparation and Presaturation <br /> The soil borings on the site were advanced in a track mounted deep rock auger rig on September 28, <br /> 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 /> 1 was used to backfill in the annular space. �(�•3� <br /> r <br /> Presaturation of the percolation test holes occurred on September 28, 2006. The depth of water <br /> used to pre-soak was 12 inches above the bottom of the boring. <br /> k <br /> 6.4 Condition of Borings After Presaturation <br /> t <br /> After the 24-hour soak period, all of the presaturated holes were found to be intact and dry on <br /> September 29, 2006 except for the shallow percolation test hole on the southeastern side of the <br /> subject property which still had water at the bottom of the hole. <br /> 6.5 Percolation Test Procedure <br /> Percolation tests were conducted for the borings on September 29, 2006 in accordance with the <br /> requirements of the EHD. A percolation test with a duration of four hours was performed for each <br /> 4 hole. The last half hour of the 4-hour percolation tests was observed by Mr. Steven Shih, Registered <br /> Environmental Health Inspector, EHD. <br /> 1 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 1/1 00th 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 /> t <br /> J <br /> 7 '0044 <br /> f <br />