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June 27, 2005 NOA Project Number: E05087A 5.4 Discussion of Soil Lithology A visual inspection of the shallow soils from on-site drilling indicates possible potential for percolation because of the sandy nature of the soils. A percolation test is the best method to determine the suitability of the soils for a septic disposal area. Please see the next section for percolation test results. Generally speaking, sandy soils have much greater potential fox percolation than fine-grained or cemented soils. 6.0 PERCOLATION TEST INFORMATION . 6.1 Percolation Test Locations A site reap indicating the locations of the percolation test holes is included as Plate 1 in the appendix of this report. 6.2 Number of Percolation Tests One shallow percolation test was conducted on each proposed parcel of the Site. For a total of two shallow percolation tests. 6.3 Boring Preparation and Presaturation Two shallow soil borings were advanced on the Site with a hand auger on and June 20, 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"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 then used to backfill in the annular space. Presaturation of the percolation test holes occurred on June 21, 2005 and June 22, 2005. The depth of water used to pre-soak was 12 inches above-the bottom of the borings. 6.4. Condition of Borings After Presaturation After the 24-hour soak period, the presaturated holes were found to be intact on June 22, 2005 and June 23, 2005. All of the percolation test holes were found to be dry on the day of testing. 6.5 Percolation Test Procedure The pretest for the percolation tests was conducted on June 22, 2005 in accordance with the requirements of the EHD. The pretest was observed by Ms. Lasa Medina. It was determined that _ 8