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December 20,2004 NOA Project Number: E04139A 6.0 PERCOLATION TEST INFORMATION 6.1 Percolation Test Locations WW A site map indicating the locations of the percolation test hole is included as Plate 1 in the appendix of this report. Y 6.2 Number of Percolation Tests One shallow percolation test was conducted on the Site. 6.3 Boring Preparation and Presaturation ` A total of one shallow boring was advanced on the Site with a hand auger on December 13, 2004. /A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of v water in the percolation test boring. Approximately 2 inches of"pea gravel"were placed in the bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. Several feet of"pea gravel" were backfilled in the annular space. Presaturation of the percolation test holes occurred on December 16, 2004. The depth of water used to pre-soak was 12 inches above the bottom of the boring. 6.4 Condition of Borings After Presaturation After the 24-hour soak period, the presaturated holes were found to be intact on December 17, 2004. The percolation test hole was dry. //6.5 Percolation Test Procedure Percolation tests were conducted for the borings on November 17, 2004 in accordance with the requirements of the EHD. A percolation test with a duration of four hours was performed for the percolation test hole. The last half-hour of the test was observed by Ms. Lisa Medina, Senior Registered Environmental Health Inspector,EHD. Measurement of the water level during the percolation test was from a fixed reference point on the PVC casing using an electric well sounder with a depth accuracy of 1/100th foot. All tabulated values on the field data sheet (appendix) are in decimal feet. After water drop was observed, the holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the bottom level of the percolation test hole. The readings were taken approximately every 30 minutes for a period of four hours. 7 kon .,44 ..