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u *V0 <br /> November 3,2004 <br /> NOA Project Number: E040119A <br /> L 6.0 PERCOLATION TEST INFORMATION <br /> L6.1 Percolation Test Locations <br /> A site map indicating the locations of the percolation test holes is included as Plate 2 of this report. (4•/J <br /> A percolation test was not required for the designated remainder parcel. <br /> L 6.2 Number of Percolation Tests <br /> One shallow percolation test was conducted on parcels 1, 2, 3, and 4 of the Site. <br /> 6.3 Boring Preparation and Presaturation <br /> LThe soil borings were advanced on the Site with a hand auger on October 11, 2004. <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. Several feet <br /> ` of"pea gravel" were backfilled in the annular space.The holes were dry with no signs of <br /> excessive moisture or ground water. <br /> LPresaturation of the percolation test holes occurred on October 12,2004. The depth of water used <br /> to pre-soak was 12 inches above the bottom of the boring. <br /> L 6.4 Condition of Borings After Presaturation <br /> After the 24-hour soak period, the presaturated holes were found to be intact on October 13,2004. <br /> On October 13, 2004, IN,2N, 3N and 4N were found to contain several inches of ground water. l <br /> 6.5 Percolation Test Procedure <br /> Percolation tests were conducted for the borings on October 13, 2004 in accordance with the <br /> requirements of the EHD. A percolation test with a of one hour was attempted for 1N,2N, 3N and <br /> ` 4N . The one hour test was observed by,Mrs. Angelica Sandoval Registered Environmental Health <br /> Specialist, EHD. <br /> LMeasurement 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 I/100th foot. All tabulated Ui•s� <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 /> 8 ..44 <br />