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FjOctober 31, 2005 <br /> NOA Project Number: E05137A <br /> Table 6. <br /> Summa of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) <br /> P-1 shallow,10/14/05 3.0 62.5 4-hr Failed percolation rate <br /> 4 P-1 deep,10/21/05 24.5 No movement 4-hr. Failed percolation rate <br /> P-1 deep,10/28/05 6.7 3.9 1-hr. Satisfactory percolation rate <br /> P-2 shallow,10/14/05 3.04 No movement 4-hr. Failed percolation rate <br /> P-2 deep,10/21/05 24.5 9.3 4-hr. Satisfactory percolation rate <br /> P-3 shallow,10/14/05 3.18 8.1 4-hr. Satisfacto ercolation rate <br /> Note: A satisfactory percolation rate for a llshat"V I test is less than or equal to 60 minutes per inch. <br /> A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. <br /> 6.7 Discussion of Percolation Test Results <br /> Based on the results of the percolation tests, the soils throughout the site have demonstrated a <br /> satisfactory percolation rate in accordance with the requirements of the EHD. The presence of <br /> sandy soils of significant thickness appear to be the most suitable soils for septic system disposal <br /> Fill fields. <br /> 6.8 Discussion of Septic System Sizing <br /> 4 <br /> -' Septic system construction should follow the San Joaquin County On <br /> Wastewater Disposal <br /> Standards where applicable. <br /> R <br /> 7.0 CONCLUSIONS <br /> In summary, satisfactory percolation rates from soil percolation tests were achieved on each <br /> E proposed parcel. No ground water was encountered in any of the borings drilled on the property. <br /> F, The depth to ground water is approximately 120 to 160 feet below the site and flows eastward. The <br /> s on-site water well was tested for nitrate and DBCP. DBCP was non-detectable, and the nitrate <br /> concentration in ground water was found to be 10.4 mg/L-NO3,which is well below the maximum <br /> contaminant drinking water limit of 45 mg/L-NO3. Based on the results of this study, our office <br /> finds this property suitable for development using conventional septic systems with leach lines and <br /> seepage pits. <br /> k <br /> 9 <br />