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August 29, 2006 NOA Project Number: E06084A Presaturation of the percolation test holes for the site occurred approximately 24 hours before the time of the percolation tests. The depth of water used to pre-soak was 12 inches above the bottom Fiof the boring. ` 6.4 Condition of Borings After Presaturation After the 24-hour soak period, the presaturated holes were found to be intact and dry on the day of testing. 6.5 Percolation Test Procedure v_ A percolation test with a duration of four hours was performed for each hole in accordance with the requirements of the EHD. The final half-hour of each four-hour percolation test was observed by Ted Tasiopoulos, 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 an 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. i � 6.6 Percolation Test Forms and Results s The completed percolation test forms are included in the appendix of this report. 1 A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth; a # 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 5. Table 5. Summa of Percolation Tests. Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minut ch) Duration (see notes) / Parcel 1 3.22 4 hour Satisfactory Percolation Rate J Parcel 2 3.02 1.87 4 hour I Satisfactory Percolation Rate Note: A satisfactory percolation rate for a"shallow"testis les than or equal to 60 minutes per inch. j I