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` February 4,2005 NOA Project Number: E040142A ` 6.3 Boring Preparation and Presaturation The soil boxings were advanced on the Site with a hand augur on December 16, 2004. 6. A 1.5-inch diameter PVC pipe with perforations on the bottom was used to measure the drop o water in the percolation test boring. Approximately 2 inches of"pea gravel' were placed in the L bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. Several feet of"pea gravel'were backfilled in the annular space. Presaturation of the percolation test holes P-3 and P-4 occurred on January 11,2005 and the presaturation of the percolation test holes P-1 and P-2 occurred on Sunday January 23,2005. The depth of water used to pre-soak was 12 inches above the bottom of the boring. 6.4 Condition of Borings After Presaturation LAfter the 24-hour soak period, the presaturated holes P-3 and P-4 were found to be intact on January 12, 2005 and the holes P-1 and P-2 were found to be intact on January 24, 2005 L6.5 Percolation Test Procedure Percolation tests were conducted for the borings P-3 and P-4 on January 12, 2005 and the tests for Lborings P-1 and P-2 were conducted on January 24, 2005 in accordance with the requirements of the EHD. A percolation test with a duration of one hour was performed for holes P-1,P-2,P-3 and P- 4. The entirety of the percolation tests P-3 and P-4 were observed by Ms. Lisa Medina, Registered Environmental Health Inspector,EHD. The entirety of the percolation tests P-1 and P-2 were observed by Mr. Michael Escotto,Registered Environmental Health Inspector,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 a ro . ate ft 6 inches)_of water above the bottom level of theme rwolation test hole. a readings were to en approximately every 30 minutes or a period of four hours. L 6.6 Percolation Test Forms and Results LThe completed percolation test forms are included in the appendix of this report. 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. A deep percolation test is defined as being between 3.5 and 25 feet in depth;a satisfactory percolation rate for a deep test is 30 min/in or less. One percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field of each parcel. Details of the 0 9