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I I I I I. August 5,2005 NOA Project Number:E0509SA Test No.,Percolation Percolation Rate Test Comment Date Tested Test Depth (ft)(minutes/inch)Duration (see notes) P-4 shallow No water drop in the last half8-2-2005 3.25 --4 hours ParccllO hour.fail P-4 deep 8-2-2005 25.0 3.33 4 hours Satisfactory pere rate Parcel 10 P-5 sb.allow 8-2-2005 3.5 16.6 4 hours Satisfactory pere rate Parcel II P-S deep 8-2-200S 24.8 3.3 4 hours Satisfactory perc rate Parcel 11 Note:A satisfactory percolationrate for a "shallow"test rs less than or equal to 60 minutes per inch, A satisfactory percolation rate for a "deep"test is less than or equal to 30 minutes per inch. 6.7 Discussion of Percolation Test Results The soils within the sewage disposal areas of all subject property parcels (7,8,9,10 and 11)have demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD for the use of a standard septic system. 6.8 Discussion of Septic System Sizing Septic system construction should follow the San Joaquin County On-Sile W tlSlewater Disposal Standards where applicable.No specific recommendations are required for this project. 7.0 CONCLUSIONS Iff sumtnary',a satisfactory percolation rate of the soil was achieved in the proposed septic disposal area on proposed Parcels 7,8,9,10 and 11.The proposed parcels appear suitable for standard septic systems. No ground water was encountered in any of the borings drilled on the property.The on-site water well was tested for nitrate and DBCP.DBCP was non-detectable,and nit.rate concentration in ground water was found to be 50.6 mg/L-N03,which is above the maximum contaminant drinking water limit of 45 mg/L-NOJ•We recommended the well not be use for drinking water since the water quality test indicates levels of Nitrate above the MCL for drinking water.We recommend discussing repair options for elevated nitrate with EHD. 10