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31 May 2007 AGE-NC-07-1528 Page 4 of 5 proposed septic system location. On 02 May 2007, the sides of the boring were scraped and loose material was removed from the boring. Once the boring was cleared, a 4-inch diameter PVC pipe with perforations on the bottom and 2 inches of fine gravel were added to the borings. Then the boring was filled with water to a depth of 12 inches above gravel at 0930. Test hole TH-1 was covered for 24 hours to allow saturation of the boring. On 03 May 2007, test hole TH-lwas inspected prior to initiation of the 4-hour percolation test. Boring TH-1 was found to be completely dry,but intact and in good condition. Six inches of clean water was added to the boring to initiate the 4-hour percolation test.The 4-hour percolation test was performed by recording the amount of water remaining in the boring at 30-minute intervals. Additional water was added to the boring if required to ensure that approximately 6-inches of water remained.Water level was measured from a fixed reference point on the PVC casing using a solinst water level meter. Measurements indicated on the Percolation Test Rate form are in decimal feet. The final 30-minute interval was observed by Ms. Lisa Medina of the SJCEHD. After completion of the test Ms. Medina reviewed the field data and signed the required SJCEHD Percolation Test Rate form. Based on the field measurements collected, the percolation rate for the parcel was calculated and summarized in Table 2 below; field measurements recorded during the test are included on the Percolation Test Rate Field Sheet provided in Appendix B. Table 2 TEST HOLE PERCOLATION RATES Test No. Diameter of Hole Depth of Hole Percolation Rate (inches) (inches) (min/in) TH-1 4 42 16.67 7.0. CONCLUSION Based on the data collected from the site, AGE concludes: • The procedures used to the conduct percolation test for test hole TH-1 conformed to SJCEHD Policy 02-02. • The soil sample collected from TH-1 consisted of soils classified as clays with sand. • The data collected from the percolation test indicates a suitable percolation rate of 16.67 minutes per inch (min/in). Based on the data there are areas within the parcel (e.g., in the Advanced GeoEnvironmental,Inc.