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January 24, 2005 <br /> NOA Pro)ect Number: E04158A <br /> Table 5 <br /> Summary 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,1-13-05 <br /> 3.2 -250 4-hr Slow percolation rate;fail; <br /> (Parcel 1) <br /> P-1 deep,1-20-05 24.55 3.33 4-hr. Satisfactory percolation rate <br /> (Parcel 1) <br /> P-2 shallow, 1-13-05 3.61 250 4-hr. Slow percolation rate,fail <br /> (Parcel 2) <br /> P-2 deep, 1-20-05 24.32 11.36 4-hr. Satisfactory percolation rate <br /> (Parcel 2) <br /> P-3 shallow,1-13-05 2.95 16.7 4-hr. Satisfactory percolation rate <br /> (Parcel 3) <br /> P-4 shallow,1-13-05 3.50 25.0 4-hr. Satisfactory percolation rate <br /> (Parcel 4 <br /> Note: A satisfactory percolation rate for a"shallow'test is less than or equal to 60 minutes per inch.A satisfactory <br /> 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 /> The soils within the sewage disposal areas of the proposed Parcels 1, 2, 3, and 4 have demonstrated <br /> a satisfactory percolation rate in accordance with the requirements of the EHD. The soils of these <br /> ` parcels appear to be suitable for a septic system utilizing leach lines and seepage pits. <br /> 6.8 Discussion of Septic System Sizing <br /> Septic system construction should follow the San Joaquin County On-Site Wastewater Disposal <br /> Standards where applicable. <br /> 7.0 CONCLUSIONS <br /> In summary, satisfactory percolation rates of the soil were achieved in the proposed septic disposal <br /> areas of all four parcels. All four parcels appear suitable for a standard septic system. <br /> No ground water was encountered in any of the borings drilled on the property. The depth to <br /> ground water was indicated to be approximately 59 feet below the ground surface for the period of <br /> Fall 1998 and Spring 1999. A water sample from the on-site water well was tested for nitrate and <br /> DBCP. DBCP was not detected in the sample,and nitrate was detected at a concentration of 17.1 <br /> mg/L-NO3,. The California Department of Heath Services maximum contaminant level for a safe <br /> drinking water supply for nitrate is 45 mg/L-NO3. <br /> 10 <br />