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L L, lv� ` May 26,2005 /NOA Project Number: E05004A L ✓ 6.4 Condition of Borings After Presaturation After the 24-hour soak period, the presaturated holes were found to be intact on May 18, 2004. The two shallow holes and one of the deep holes were found to be dry,while standing water was 4 ✓/observed in the other deep hole. L. 6.5 Percolation Test Procedure Percolation tests were conducted for the boxings on May 18,2005 in accordance with the frequirements of the EHD. A percolation test with a duration of four hours was performed for each L hole. The final half-hour of each four-hour percolation test was observed by Ms. Lisa Medina, Registered Environmental Health Inspector,EHD. 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 L 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 L for a period of four hours. ✓6.6 Percolation Test Forms and Results LThe completed percolation test forms are included in the appendix of this report. I 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 L 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 to be suitable for a standard septic system. Details of the percolation tests are summarized in Table 5. L L L 9 .,04 6-