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April 7,2006 NOA Project Number: E06020A Table 4. Summary of Percolation Test. r Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) Parcel 1 3.02 25.0 4 hour satisfactory Percolation Rate ` 3-20-2006 Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per i c� �. 6.7 Discussion of Percolation Test Results The soils within the sewage disposal area of the site have demonstrated a satisfactory percolation L. rate in accordance with the requirements of the EHD. The soils of this Site appear to be suitable for a standard septic system. Please see recommendations in the NLS for details regarding septic sizing. 6.8 Discussion of Septic System Sizing L, Septic system construction should follow the San Joaquin County On-Site Wlastewater Disposal Standards lvberre applicable. 7.0 CONCLUSIONS In summary, a satisfactory percolation rate of the soil was achieved in the proposed septic disposal area for the site. The proposed parcel appears suitable for a standard septic system. 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 was not detected in the water sample, and Nitrate was detected at a concentration of 4.8 mg/L-NO3;well below the maximum contaminate limit from drinking water of 45 mg/L-NO3. See conclusions in Part II,Nitrate Loading Study attached to this L report for further discussion. 8.0 LIMITATIONS his 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. 9