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Traylor Shea Precast Page 7 of 14 <br /> Our Project Number: E071VfB ` <br /> November 29, 2007 <br /> v <br /> I.6.4 Condition of Borings After Presaturation <br /> After the soak period, the presaturated holes were found to be intact and dry on November 26, <br /> 2007. <br /> I.6.5 Percolation Test Procedure <br /> A percolation test was conducted for the borings on November 26, 2007 in accordance with the <br /> requirements of the EHD. A percolation test with a duration of four hours was performed. The <br /> last half an hour of the test was observed by Michael Escotto, Senior Registered Environmental <br /> Health Specialist, EHD. <br /> Measurement of the water level during the percolation test was from a fixed reference point on <br /> the PVC casing using an electric well sounder with an depth accuracy of 1/100th foot. All <br /> tabulated values on the field data sheet (appendix) are in decimal feet. After water drop was <br /> observed, the holes were checked for refill. The refill level was approximately 0.5 ft (6 inches) <br /> of water above the bottom level of the percolation test hole. The readings were taken every 30 <br /> minutes for a period of four hours. <br /> I.6.6 Percolation Test Forms and Results <br /> The completed percolation test form is 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. <br /> A deep percolation test is defined as being between 3.5 and 25 feet in depth; a satisfactory <br /> percolation rate for a deep test is 30 min/in or less. One percolation test must demonstrate a <br /> satisfactory percolation rate within the proposed septic system disposal field of each parcel to <br /> utilize a standard septic system. Details of the percolation tests are summarized in the table <br /> below. <br /> Table 5. <br /> Sum ary of Percolation Test. <br /> Test No., Percolation Test Percolation Rate Test Duration Comments <br /> Date Tested Depth(ft.) (minutes/inch) (see notes) <br /> P-1 (shallow) 3.25 4.1 4-hr Satisfactory perc rate Ir� <br /> 11-26-07 <br /> Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. <br /> r <br /> I.6.7 Discussion of Percolation Test Results <br /> The soils within the sewage disposal areas of the site have demonstrated a satisfactory <br /> percolation rate in accordance with the requirements of the EHD for the use of a standard 6, <br /> septic system. <br /> ` 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02007 Neil O.Anderson&Associates,Inc <br />