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L <br /> LMarch 27, 2006 <br /> NOA Project Number: E05144B <br /> L Table 6. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> ` Date Tested Test Depth(ft) (m' tes/inch) Duration (see notes) <br /> Parcel 1 3.0 4.17 4-hr. Satisfactory percolation rate <br /> Shallow 3-22-06 <br /> Parcel 2 <br /> Shallow 3-22-06 3.0 4.09 4-hr. Satisfactory percolation tate <br /> ` Parcel l 9.0 5.0 4-hr. Satisfactory percolation rate <br /> Deep 3-22-06 <br /> Parcel 3 3.0 9,26 4-hr. Satisfactory percolation rate <br /> v Shallow 3-23-06 <br /> Parcel 3 25.0 .5 4-hr. Satisfactory percolation rate <br /> Deep 3-23-06 <br /> Shallow 3Parce'23-06 3.0 1.6 ) ' 1-hr. $atisfactory percolation rate <br /> Note: A satisfactory percolation rate for a"shallow"tis than or eq minutes per inch. <br /> A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. <br /> Lif/7 Discussion of Percolation Test Results <br /> L 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. <br /> /6.8 Discussion of Septic System Sizing <br /> L Septic system construction utilizing leach lines and pits should follow the San Joaquin County Ir <br /> On <br /> Site Wastewater Di poral Standards where applicable. If cobbles prevent excavation of see <br /> stumps shouldbe used in the' ace_ Due to the dep o groundwater, (130 feet) and the likely <br /> existence of fine-grained soils deeper, the impact to groundwater from percolating effluent is <br /> Lestimated to be low. <br /> L LL <br /> tX0 CONCLUSIONS <br /> f` <br /> In summary, satisfactory percolation rates from soil percolation tests were achieved on each <br /> proposed parte. o groin water was encountered in any of the borings drilled on the property. <br /> The depth to ground water is approximately 120 to 130 feet below the site and flows westward. The <br /> on-site water well was tested for ni�a nd Bf P. DBCP was non-detestable, and the nitrate <br /> concentration in ¢rotInd water was fo ugdAp. -be 26.6 me/L-NC3,which is well below the maximum <br /> Lcontaminant drinking water limit of 45 mg/L-NO3. Based on the results of this study, our office <br /> 10 <br /> L '404 <br /> L <br />