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_ r A June 13,2005 NOA Project Number: E05042A -6.2." Number of Percolation Tes3ts _ One shallow percolation test was conducted on each parcel of the Site for a total of four shallow .percolation tests-.--- '- 6.3 , ests 6.3 Boring Preparation and Presaturation The soil boring was advanced.on the-Site with a hand augur on April 28, 2005, A 1:5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of = water in the percolation test boring. Approximately 2 inches of"' ravel" were placed in the p g ea gravel" bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. "Pea gravel" was use_d to_ backfill in the annular space. Presaturation of the percolatiorn test hole'occurred on April 28, 2005.--The depth of water used to - ^pre-soak was 12 inches above the bottom of the boring. G.4 Condition of Borings AfteraPresaturation After the 24-hour soak period, the presaturated holes were found to be intact and dry on the day of -testir g. V - - _ 6.5 Percolation Test 'Procedure The percolation tests w onducted on April 29, 2005 in accordance-with the requirements of the t-' - -EHD. =A percolation test with a duration of four hours was performed for each hole. The final half-hour of the four-hour percolation tests were observed by Mr. David Van Dyne, Senior Registered Environmental Health Specialist,EHD. E -Measurement of the w'ate'r level during the percolation test was from a fixed reference point on the i" PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All tabulated values`ori the field data sheet (appendix) are in decimal feet. After water drop was observed, the holes wcre checked for refill. The ref -level was approximately 0.5. ft (6 inches) of water above the F1 bottom level of the percolation test hole._.The readings were taken approximately every 30 minutes fora period of four hours. -6.6 Percolation Test Forms and Results -The completed.percolation test forms are.included in the appendix of this report. L T_ A shallow percolabon Ytestis defined by the EHD as being between 36 and 42 inches in depth; a F. _. satisfactory percolation rate'for a shallow test is less than or equal to 60 minutes per inch drop. Details of the percolation tests are summarized in Table 6. ' ._ - 10