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January 4,2006 NOA Project Number: E05166B Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) Parcel 3 (shallow) 3.02 ✓ 250 4 hr Failing percolation rate 12-19-05 Parcel 3 (deep) 24.03 125 4 hr Failing percolation rate 12-19-05 Noce. 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 parcels six and seven have demonstrated a satisfactory percolation rate for a standard septic system. However,the rest of the parcels have not demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD for the use of a standard septic system. The proposed parcels appear suitable for engineered septic systems. 6.8 Discussion of Septic System Sizing r. Septic system construction should follow the San Joaquin County On-Site Wlastewater Disposal Standards where applicable for parcels six and seven. The remaining parcels will require engineering to mitigate the unsatisfactory percolation rates. 7.0 CONCLUSIONS In summary,parcels six and seven were found to be suitable for use with a standard septic system ■- utilizing leach lines and seepage pits. Parcels one,two, three, four and five demonstrated unsatisfactory percolation rates. For these parcels we recommend a Civil Engineer prepare a septic ,-.-system design for the proposed parcels unless additional percolation testing,performed under EHD oversight,achieves a satisfactory rate. Our office has been contracted by the client to prepare engineered septic system drawings for the property;they are included with this report. too �-- No ground water was encountered in any of the borings drilled on the property.The depth to ground water was found to be approximately 90 to 100 feet below the ground surface for the period of Fall 1998 and Spring 1999 based on the San Joaquin County Ground Water Maps. water well was tested for nitrate and DBCP. DBCP was detected in the water sample .13 , below the MCL of 0.2 ug/L. Nitrate was found at 1.74 mg/L-NO3,below the MCL of 45 mg/L- NO3. 11