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.,/ June 14, 2005 /6.6 NOA Project Number: E05066A 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 to utilize a standard septic system. Details of the percolation tests are summarized in Table 5. " Table 5. / Summa of Percolation Tests. 1/ Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) minutes/inch) Duration (see notes) P-1 shallow,6/9/2005 3.13 4.24 4-hr Satisfactory percolation rate Parcel 1 Note: A satisfactory percolation rate for a"shallow'test is ess than or equal to 60 minutes per inch. 6.7 Discussion of Percolation Test Results The soils within the sewage disposal areas the parcel have demonstrated a satisfactory percolation /rate in accordance with the requirements of the EHD for the use of a standard septic system. d 6.8 Discussion of Septic System Sizing Septic System Construction should follow the San Joaquin County On-Site Wastewater Disposal Standards where applicable. Refer to the attached Nitrate Loading Study for additional discussion of recommendations for the project. 7.0 CONCLUSIONS In summary,a percolation rate of the soil that meets the minimum EHD standards was achieved in the proposed septic disposal area of the Site. Refer to the attached Nitrate Loading Study for a further discussion of conclusions for the project. No ground water was encountered in any of the borings drilled on the property. The depth to ground water was found to be approximately 50-60 feet below the ground surface for the period of Fall 1998 and Spring 1999 based on the San Joaquin County Ground Water Maps. The on-site water well was tested for nitrate and DBCP. DBCP and was non-detectable in the water sample. Nitrate was found at 9.83 mg/L-NO3i below the MCL of 45 mg/L-NO3. No records were found at EHD as to the depth of the well. 9