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August 8, 2006 NOA Project Number: E06087A 6.3 Boring Preparation and Presaturation M The soil borings on the site were advanced in an all-terrain-mountcd deep rock auger rig on July 26, 2006 and with a hand augur on August 1, 2006. �} 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"pea gravel" were placed in the bottom of the open soil boring, then the PVC pipe was installed on top of the gravel. "Pea gravel" was used to backfill in the annular space. Presaturation of the percolation test holes occurred on July 26 and August 1, 2006. The depth of ] water used topre-soak was 12 inches above the bottom of the boring. 6.4 Condition of Borings After Presaturation F After the 24-hour soak period, the presaturated holes were found to be intact and dry on July 27, G.� � J 2006 and August 2,2006. 6.5 Percolation Test Procedure I Percolation tests were conducted for the borings on July 27, 2006 and August 2, 2006 in accordance with the requirements of the EHD. A percolation test with a duration of four hours was performed for each hole. The last half hour of the 4-hour percolation tests on July 27, 2006 was observed by � Mr. Michael Escotto,Registered Environmental Health Inspector, EHD and the last half hour of the 4-hour percolation tests on August 2,2006 was observed by Ms. Lisa Medina, Registered Environmental Health Inspector, EHD. j 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. 6.6 Percolation Test Forms and Results The completed percolation test form is 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 1 percolation rate within the proposed septic system disposal field of each parcel to be suitable for a f f ,