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Soil Suitability/ Nitrate Loading Study Irerracon <br /> Whitlow Property Stockton, CA <br /> November 20, 2019 Terracon Project No. NA197078 <br /> Procedure#2.Terracon added clear water approximately 0.5 feet above the top of the gravel and <br /> recorded the drop in water level at thirty minute intervals and test durations varied. Measurement <br /> of the water level during the percolation test was from a fixed reference point on the PVC casing <br /> using a calibrated Solinst electric water level detector with a depth accuracy of 0.01 feet. All <br /> tabulated values on the field data sheet are in decimal feet. <br /> 1.6.6 Percolation Test Forms and Results <br /> A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth. <br /> While a deep percolation test is defined by the EHD as being between 42 inches and 25 feet in <br /> depth. The shallow percolation test must demonstrate a satisfactory percolation rate of less than <br /> or equal to 60 minutes per inch within 100 feet of the septic system disposal field in order to utilize <br /> a standard septic system and 30 minutes per inch or less for septic pits. Details of the percolation <br /> tests are summarized in the table below. <br /> Table 7. <br /> Summary of Percolation Tests. <br /> Date Percolation Percolation Rate Test Comments <br /> Test No. Test <br /> Tested Depth(feet) (minutes/inch) Duration (see notes) <br /> 131 10/01/2019 3.5 0 1.75 hours Unsatisfactory <br /> Percolation Rate. <br /> 10/11/2019 25 0 3 hours Unsatisfactory <br /> Percolation Rate. <br /> B3 <br /> 10/31/2019 21 27.7 4 hours Satisfactory <br /> Percolation Rate. <br /> B4 10/31/2019 16 0 4 hours Unsatisfactory <br /> Percolation Rate. <br /> B5 10/31/2019 18 0 4 hours Unsatisfactory <br /> Percolation Rate. <br /> B6 10/31/2019 7 0 4 hours Unsatisfactory <br /> Percolation Rate. <br /> LL <br /> Note: A satisfactory percolation rate is 60 minutes per inch or less for shallow leach lines and 30 minutes per inch or less for septic <br /> pits per SJEHD,Onsite Wastewater Disposal Standards,January 2017. <br /> Borings B3 through B6 percolation tests were observed by Ms. Daria Afonskaia, EHD <br /> representative. Borings 131 and B3 (10-11-19) were not observed by the EHD as Terracon <br /> cancelled the inspection due to the failing percolation tests. The completed percolation test forms <br /> with Ms. Afonskaia's verification signature are included in Appendix E of this report. <br /> Responsive ■ Resourceful ■ Reliable 12 <br />