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L u <br /> LSeptember 9, 2005 <br /> NOA Project Number: E05039B <br /> Lseptic system. Details of the percolation tests are summarized in Table 5. <br /> Table 5. <br /> r <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 /> 6' P-1 shallow,8-23-05 <br /> (Parcell) 3.55 11.36 4-hr Satisfactory percolation tate <br /> P-2 shallow,8-23-05 <br /> v 3.17 125 4-hr Slow percolation rate,fad <br /> (Parcel 2) <br /> P-3 shallow,8-73-05 3.37 20.83 4-hr Satisfactory percolation rate <br /> (Parcel 3) <br /> P4 shallow,8-23-05 3,66 5 4-hr. Satisfactory percolation rate <br /> Parcel 4 <br /> r. Note: A satisfactory percolation rate for a"shallovZ' 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 parcels one, three and four have demonstrated a <br /> L, satisfactory percolation rate in accordance with the requirements of the EHD for the use of a <br /> standard septic system. Parcel two had a failing percolation rate and therefore does not fit the <br /> Lrequirements for a standard septic system. <br /> 6.8 Discussion of Septic System Sizing <br /> LSeptic System Construction should follow the San Joaquin County On-Site Wastewater Disposal <br /> Standards where applicable.We recommend a Civil Engineer prepare a septic system design for <br /> L Parcel two unless additional percolation testing on the Parcel indicates a satisfactory rate and is <br /> approved by the EHD. <br /> L7.0 CONCLUSIONS <br /> In summary,percolation rates that meet the minimum EHD standards were achieved in the <br /> L proposed septic disposal areas of Parcels one, three and four.The parcels appear suitable for the use <br /> of a standard septic system. For Parcel two we recommend a Civil Engineer prepare a septic system <br /> design for the Parcel unless additional percolation testing on the Parcel indicates a satisfactory rate <br /> Land is approved by the EHD. <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 /> L ground water was found to be 19.0 mg/L-N031which is well below the maximum contaminant <br /> L 9 .-44 <br /> L <br />