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L September 9,2005 NOA Project Number: E05112A L6.2 Number of Percolation Tests LOne shallow percolation test was conducted on each parcel of the Site for a total of two shallow s percolation tests. �A fes: Y I 6.3 Boring Preparation and Presaturation L The soil borings were advanced on the Site with a hand augur on August 29, 2005. LA 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"pea gravel' were placed in the L bottom of the open sod boring,then the PVC pipe was installed on top of the gravel. "Pea gravel' was used to backfill in the annular space. L Presaturation of the percolation test hole occurred on August 29,2005. The depth of water used to pre-soak was 12 inches above the bottom of the boring. 1. 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 Ltesting. 6.5 Percolation Test Procedure LThe percolation tests were conducted on August 30,2005 in accordance with the requirements of the EHD. A percolation test with a duration of four hours was performed for each hole. The final L half-hour of the four-hour percolation tests were observed by Mr. David Van Dyne, Senior Registered Environmental Health Specialist, EHD. L 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. L6.6 Percolation Test Forms and Results LThe completed percolation test forms are included in the appendix of this report. n F , A shallow percolation test is defined by the EHD as being between 36 42 inches fn depth;a Lsatisfactory percolation rate for a shallow test is less than or equal to 60 ' ute er inch drop. 9 .44L L