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April 29,'2005 NOA Project Number:-E05040A a Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth'(ft) (minutes/inch) Duration (see notes) rj = iL P-20 deep,4/20/05,.. Z4.39 Parcel 20 '39 3.13 .4-hr. Satisfactory percolation rate Note: A satisfactory percolation rate for a."shallow'-test is less than or equal to 60 minutes per inch. f A satisfactory percolation rate for a"deep".tesi is less than or equal to 30 minutes per inch. 6.7 Discussion of Percolation Test Results FAThe soils within the sewage disposal areas of all parcels of the site have demonstrated a satisfactory g P P percolation rate in accordance with the requirements of the EHD for the use of a standard septic system. 6.8 Discussion of Septic System-Sizing Septic System Construction should follow the San Joaquin County On-Site WlastewaterDisposal Standards where applicable. Refer to the attached Nitrate Loading Study for additional discussion of recommendations for the project. 7.0 CONCLUSIONS In summary, percolation rates that meet the minimum EHD standards were achieved in the proposed septic disposal areas of each.of the proposed parcels. Refer to the attached Nitrate Loading Study fora further discussion of conclusions for the project. No ground water was encountered in any of the borings drilled on the property:The on-site water well was tested for nitrate and DBCP. .DBCP and was non-detectable in the water sample. Nitrate was found at 13.7 mg/L,-NO3, below the MCL of 45 mg/L-NO3. 7.1 Signatures The signatures of the enviroriinental professionals involved in the preparation of this report can be found at the front of this package. 8.0 LIMITATIONS The conclusions of this report are based on the information provided regarding the existing and proposed development, the use of the subject property, and the site conditions as they existed at the time we excavated our test holes and performed the percolation tests. It was assumed that the test holes and percolation test_results are representative of the subsurface conditions in the general area. 11