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L <br /> LFebruary 24,2006 <br /> NOA Project Number: E05139B <br /> p Table 4. <br /> L <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 3.32) No movement 4 hr Failing percolation rate <br /> 2-1-06 <br /> ` P2 1-06 p 24,15 1.67 ✓ 1 hr Satisfactory percolation rate / <br /> ` P-2 Shallow 3.4 No movement 4 hr Failing percolation rate <br /> 2-1-06 <br /> P-2 Deep 24.44 1.67 1 hr Satisfactory percolation rate <br /> 2-1-06 <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 /> L6.7 Discussion of Percolation Test Results <br /> LThe soils within the sewage disposal areas of the site have demonstrated a rapid percolation rate. <br /> The soils of these parcels appear to be suitable for the use of a modified filter bei septic system. <br /> L /V� <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.We would recommend that a filter bed septic system be utilized due to <br /> the rapid percolation rate observed.The filter bed should be modified by adding three to four inches <br /> of compost or peat to the bottom of the bed to reduce the infiltration rate and promote additional <br /> Ldenitrification of the effluent. A double tank system as outlined by EHD should be utilized. Both <br /> improvements will help to reduce the impacts of rapid percolation to groundwater.. <br /> L7.0 CONCLUSIONS <br /> L In summary,satisfactory percolation rates of the soil were achieved in the proposed septic disposal <br /> areas of the Site. The proposed Parcel appears suitable for the modified filter bed system discussed <br /> in Section 6.8. <br /> No ground water was encountered in any of the borings drilled on the property. The depth to <br /> ground water was found to be approximately 70 to 80 feet below the ground surface for the period <br /> Lof Fall 1998 and Spring 1999. <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 /> 9 <br /> L .,44 <br /> L <br />