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6. ti July 28,2006 NOA Project Number: E05167B L 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 Lholes 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 every 30 minutes for a period of four hours. b. 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 6. deep percolation test is defined as being between 3.5 and 25 feet in depth;a satisfactory percolation rate for a deep test is less than or equal to 30 minutes per inch drop. One percolation test must ' demonstrate a satisfactory percolation rate within the proposed septic system disposal field of each parcel to utilize a standard septic system. Details of the percolation tests are summarized in Table 5. Table 5. Summary of Percolation Tests. Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) P-1 Shallow 3.32 250 4 hours Failing percolation rate V P-1 Deep 19.43 9.26 4 hours Satisfacto ation care ercol Note: d satisfactory percolation rate fora"shallow"testis 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. 6a 6.7 Discussion of Percolation Test Results The soils within the sewage disposal areas of the site have demonstrated a satisfactory percolation 6. rate in accordance with the requirements of the EHD for the use of a standard septic system. i 6.8 Discussion of Septic System Sizing L Septic System Construction should follow the San Joaquin County On-Site Wastewater Disposal Standards where applicable. L 7.0 CONCLUSIONS In summary, satisfactory percolation rates of the soil were achieved in the proposed septic disposal Lareas of the Site. The septic disposal area of the proposed parcel appears suitable for a standard 8 L i 6