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f <br /> � r <br /> December <br /> 23, 2005 <br />} NOA Project Number: E05174A <br /> i/6.5 Percolation Test Procedure <br /> � G5 <br /> A percolation test was conducted for the boring on December 20, 2005 in accordance with the <br /> requirements of the EHD. A percolation test with a duration of four hours was performed. The last <br /> '/z hour of the of the percolation test was observed by Ms. Lisa Medina, Senior Registered <br /> Environmental Health Inspector, EHD. <br /> Measurement of the water level during the percolation test was from a fixed reference point on the <br /> p <br /> E 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 /> hole was checked for refill. The readings were taken approximately every 30 minutes for a period of <br /> four hours. <br /> 6.6 Percolation Test Form and Results <br /> The completedercolation test form is included in the appendix of this re <br /> p pp port. <br /> A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth; a j <br /> satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop. <br /> Details of the percolation test are summarized in Table 5. <br /> 3 Table 5. <br /> Su Mary of Percolation Tests. � <br /> � Test No., Percolation Percolation Rate Test Comment � <br /> Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) <br /> ti <br /> P-1 shallow, 12-20-05 Unsatisfactory Result <br /> �+ APN 023-170-08 3.0 --- 4-hr. No movement observed after <br /> 1 hour. <br /> Note: A satisfactory percolation rate for a"shallov/'.test is less than or equal to 60 minutes per inch. f <br /> 7 6.7 Discussion of Percolation Test Results <br /> The soils within the area tested did not achieve a satisfactory percolation rate in the shallow soil <br /> zone. A deep percolation test was riot possue two the ltmttations of die drill rig t gh" <br /> lo <br /> largffigravel and-w�obble. <br /> It is our.o inion that the cla e � eRistrix <br /> p y yting betweenn the a712 hasrestricted the <br /> percolation of..water into the soi <br /> y 6.8 Discussion of Septic System Sizing i <br /> Though no septic system is planned on the site, any future septic system construction should follow <br /> the San Joaquin County On-Site Vastewater Disposal Standards where applicable. Should a new <br /> i <br />