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la �%W %..-, <br /> L December 7, 2005 <br /> NOA Project Number: E05141B <br /> 6.3 Boring Preparation and Presaturation <br /> L A total of three shallow and three deep soil borings were advanced on the Site with a truck-mounted <br /> deep rock augur rig on November 1,2005. <br /> I <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 Gravel' <br /> was then used to backfill in the annular space. <br /> LPresaturation of the percolation test holes occurred on November 1, 2005. The depth of water used <br /> to pre-soak was 12 inches above the bottom of the boring. <br /> 1' 6.4 Condition of Borings After Presaturation <br /> L After the 24-hour soak period, the presaturated holes were found to be intact and dMon November <br /> 2,2005. <br /> 6.5 Percolation Test Procedure <br /> L <br /> Percolation tests were conducted for the borings on November 2 2005 in accordance with the <br /> requirements of the EHD. A percolation test with a duration of four hours was performed for each <br /> Lhole. The last half an hour was observed by Mr. David Van Dyne,Registered Environmental <br /> Health 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 I/I 00th foot. All tabulated <br /> values on the field data sheet(appendix) ate 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 /> 6.6 Percolation Test Forms and Results <br /> L <br /> The completed percolation test form is included in the appendix of this report. <br /> be <br /> 9 <br /> .,44 <br /> L <br />