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November 23,2004 NOA Project Number: E04140A Measurement of the water level during the percolation test was from a fined 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 hole was 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 10 minutes for a period of one hour. ` 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. One ` percolation test must demonstrate a satisfactory percolation rate within the proposed septic system disposal field of each parcel. Details of the percolation test are summarized in Table 3. Table 3. Summary of Percolation Test Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) P-1, Shallow percolation test, 3.0 1.8 1-hr Satisfactory percolation rate. 8-2-02 Note:A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. 6.7 Discussion of Percolation Test Results The soils within the sewage disposal areas of the subject parcel demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD. The percolation rate is less than 5 minutes per inch which is considered rapid. Given the rapid rate and shallow depth to ground water, we would recommend utilizing a filter bed system for any future septic systems or major repairs. The ` filter bed system has been used by the EHD in similar situations to mitigate the rapid percolation rate of the soils. 6.8 Discussion of Septic System Sizing There are no plans to construct any new septic systems on the property. Any future construction or '— repairs should follow the San Joaquin County On-Site Wastewater Disposal Standards where applicable. Refer to the attached Nitrate Loading Study for a summary of recommendations. 7.0 CONCLUSIONS Please see the conclusions discussed in Part II, the nitrate loading study, of this report. 9