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Thelma E. Hieb Revocable Trust Page 6 Our Project Number: E07202B December 20, 2007 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 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 every 30 minutes for a period of four (4) hours. 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 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/in or less. 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 the table below. Table 3. Summary of Percolation Tests ! — Test No., Percolation Test Percolation Rate Comments Date Tested Depth (ft.) (minutes/inch) Test Duration (see notes) P-1 (Deep) 6.9 250 4-hr Failing perc rate 12-14-07 P-1 (Shallow) 3.15 125 4-hr Failing perc rate 12-14-07 P-1 (Deep) 23.80 250 4-hr Failing perc rate 12-19-07 P-1 (Shallow) 3.2 No movement 4-hr Failing perc rate 12-19-07 F 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. 6.7 Discussion of Percolation Test Results The soils within the sewage disposal areas of the site have not demonstrated a satisfactory percolation 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 - The proposed Parcel 1 is suitable for an engineered septic system. We recommend a Civil r Engineer prepare a septic system design for Parcel 1 unless additional percolation testing on the Parcel indicates a satisfactory rate is achieved and approved by the EHD. 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 ©2007 Neil O.Anderson&Associates,Inc