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I <br /> L `./ %./ <br /> May 26,2005 <br /> NCA Project Number: E05004A <br /> LTable 5. <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,5/18/05 3.27 27,8 4-hr Satisfactory percolation rate <br /> (Parcel 1) / <br /> P-1 deep,5/18/05 22.49 250 (/ 4-hr. Slow percolation rate,fail <br /> (Parcel 1) <br /> P-2 shallow,5/18/05 3.37 25 v 4-hr. Satisfactory percolation rate <br /> (Parcel 2) <br /> P-2 deep,5/18/05 4-h: No water drop observed last <br /> (Parcel 2 20 07 half an hour,fail <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 /> 4.7 Discussion of Percolation Test Results <br /> LThe soils within the sewage disposal areas of the proposed Parcels 1 and 2 have demonstrated a <br /> satisfactory percolation rate in accordance with the requirements of the EHD. The soils of these <br /> Lparcels appear to be suitable for 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 /> b. ✓ 7.0 CONCLUSIONS <br /> ` In summary, satisfactory percolation rates within the shallow zone were achieved in the proposed <br /> septic disposal areas of both the parcels. The proposed Parcels 1 and 2 appear suitable for a <br /> kstandard septic system utilizing leach lines pits or sumps. <br /> Perched ground water was encountered in one of the deep borings drilled on the site. The perched <br /> water was encountered at 18 feet below the ground surface.We believe that the water was from <br /> r seasonal rain perched on a hard pan surface which exists in the area.The depth to ground water <br />�1 table was found to be approximately 160-180 feet below the ground surface for the period of Fall <br /> 1998 and Spring 1999 based on the San Joaquin County Ground Water Maps. The on-site water <br /> Lwell was tested for nitrate an�was non-detectable,and nitrate um contaminant in <br /> ground water was found to b 1.3 mg/L-N 3,which is well below the maximum contaminant <br /> Ldrinking water limit of 45 mg/L- <br /> 10 <br /> L <br /> L <br />