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*Mrs•, » •— ..,/ <br /> September 30, 2007 <br /> NOA Project Number: E07146A <br /> Page 8 <br /> )6.6 Percolation Test Forms and Results <br /> The completed percolation test forms are included in the appendix of this report. <br /> A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth;a <br /> satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. A <br /> deep percolation test is defined as being between 3.5 and 25 feet in depth; a satisfactory percolation <br /> rate for a deep test is 30 min/in or less. One percolation test must demonstrate a satisfactory <br /> percolation rate within the proposed septic system disposal field of each parcel to utilize a standard <br /> septic system. Details of the percolation tests are summarized in the table below. <br /> Summary of Percolation Tests. <br /> Test No., Percolation Percolation Rate Test Comment <br /> Date Tested - Test Depth (ft) 4 'a in) Duration (see notes) <br /> Shallw19-5-07 3.23 3.68 4-hr. Satisfactory percolation rate <br /> p-2 �lnr/2/ <br /> Shallow,9-5-07 3.27 3.9 4-hr. Satisfactory percolation rate <br /> Note: A-satisfactory percolation rate for a"shallow/'testis 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 parcel have demonstrated a satisfactory percolation <br /> rate in accordance with the requirements of the EHD for the use of a standard septic system. <br /> t/6.8 Discussion of Septic System Sizing <br /> Septic System construction should follow the San Joaquin County On-Site WastewaterDiposal <br /> Standards where applicable. <br /> /7.0 CONCLUSIONS <br /> In summary, a satisfactory percolation rate of the soil was achieved in the proposed septic disposal <br /> area on the site. The proposed area appears suitable for standard septic system. <br /> No ground water was encountered in the boring drilled on the property.The depth to ground water <br /> was between 70 and 80 feet in 1999. The on-site water well was tested for nitrate and DBCP. Nitrate <br /> was found at 7.9 mg/L-NO3, below the maximum contaminant drinking water limit of 45 mg/L- <br /> NO,. DBCP was not detected in the well water sample. <br /> 8 <br />