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I May 26, 2005 NOA Project Number: E05053A 6.5 Percolation Test Procedure Percolation tests were conducted for the borings on March 24, 2005 in accordance with the requirements of the EHD. A percolation test with a duration of four hours was performed for each hole. The final half-hour of each four-hour percolation test was observed by Ms. Lisa Medina, Registered Environmental Health Inspector, EHD. F 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. Alltabulated 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 hale. The readings were taken approximately every 30 minutes F! for a period of four hours. 6.6 Percolation Test Forms and Results The completed percolation test form is included in thea appendix of this report. pp p � 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 a 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 per inch 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. ` Table 5. Summary of Percolation Tests. M Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) P-1 shallow,5/24/05 3.40 6.76 4-hr Satisfactory percolation rate (Parcel 1) P-1 deep,5/24/05 23.13 41.6 4-hr Slow percolation rate,fail F1 (Parcel l) P-2 shallow,5/24/05 (Parcel 2) 3.35 13.16 4-hr Satisfactory percolation rate F1 P-2 deep,5/24/05 No water drop observed last (Parcel 2) 8'90 --- 4-hr half and hour,fail P-3 shallow,5/24/05 3.36 .5.81 4-hr Satisfactory percolation rate Parcel l Note: A satisfactory percolation rate for a"shallow'test is less than or equal to 60 minutes per inch. A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. F1 'I 8