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t <br /> September 9, 2005 <br /> NOA Project Number: E05011 B <br /> Table 5. OCT 31 AH I I. 5 <br /> Summary of Percolation T <br /> %l)AOUIN CO <br /> UP3TY <br /> E�a�d1�2o;di�lErdS AL <br /> Test No., Percolation Percolation Rate WE Comment <br /> Date Tested Test Depth (ft) (minutes/inch) Duration (see notes) <br /> P-1 Shallow 3.4 4.23 4 hours Satisfactory Perc Rate <br /> P-1 Deep 22.36 5.55 4 hours Satisfactory Perc Rate <br /> P-2 Shallow 3.42 11.90 4 hours Satisfactory Perc Rate <br /> P-2 Deep 24.31 5.10 4 hours Satisfactory Perc Rate <br /> P-3 Shallow 3.29 5.0 4 hours Satisfactory Perc Rate <br /> P-3 Deep 22.06 3.84 4 hours Satisfactory Perc Rate <br /> P-4 Shallow 3.30 10.0 4 hours Satisfactory Perc Rate <br /> P-4 Deep 24.50 4.31 4 hours Satisfactory Perc Rate <br /> Note: A satisfactory percolation rate for a"shallow"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 /> The soils within the sewage disposal areas of the site have demonstrated a satisfactory percolation <br /> rate in accordance with the requirements of the EHD for the use of a standard septic system. <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 the Site. The septic disposal areas of the proposed parcels appear suitable for a standard <br /> septic system. <br /> No ground water was encountered in any of the borings drilled on the property. The on-site water <br /> well was tested for nitrate and DBCP. DBCP was non-detectable,and nitrate concentration in <br /> ground water was found to be 65.1.0 mg/L-NO3,which is above the maximum contaminant <br /> drinking water limit of 45 mg/L-NO3.We recommend the well not be use for drinking water since <br /> the water quality test indicates levels of Nitrate above the MCL for drinking water.We recommend <br /> discussing well repair options for elevated nitrate with EHD. <br /> 9 .444 <br />