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June 27, 2005 <br /> NOA Project Number: E05087A <br /> the holes were suitable for a one hour percolation test. A percolation test was conducted for each <br /> parcel on June 23, 2005 in accordance with the requirements of the EHD. A percolation test with a <br /> duration of one hour was performed for each hole. The entirety of the test was observed by Ms. <br /> Lisa Medina, Senior Registered Environmental Health Specialist, EHD. <br /> Measurement of the water level during the percolation test was from a fixed reference point on the <br /> PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All tabulated <br /> values on the field data sheet (appendix) are in decimal feet. After water drop was observed, the <br /> holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) of water above the <br /> bottom level of the percolation test hole. The readings were taken every 10 minutes for a period of <br /> one hour. <br /> 6.6 Percolation Test Forms and Results <br /> 0 The completed percolation test forms are included in the appendix of this report. <br /> A shallow percolation test is defiled 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 /> 01 percolation test must demonstrate a satisfactory percolation rate within the proposed septic system <br /> disposal field of each parcel to utilize a standard septic system. Details of the percolation tests are <br /> summarized in Table 6. <br /> Table 6. <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,6/23/2005 3.48 2.03 1-1tr Satisfactory percolation rate <br /> (Parcel 058-110-48) <br /> [P-(Parcel <br /> 2 shallow,6/23/20055 3.40 3.04 1-hr Satisfactory percolation rate <br /> 058-110-50 <br /> FtNote: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. <br /> 6.7 Discussion of Percolation Test Results <br /> The soils within the sewage disposal areas of the site have demonstrated a satisfactory percolation <br /> rate in accordance with the requirements of the EHD for the use of a standard septic system. <br /> Though the percolation rate was rapid for both parcels,we believe the depth to groundwater (60 to <br /> 70 feet) will provide filtration and alteration of nitrates. <br /> 6.8 Discussion of Septic System Sizing <br /> 0 Septic system construction should follow the San Joaquin County On-Site Wastewater Disposal <br /> 9 <br />