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Soil Suitability/ Nitrate Loading Study 1 ferraeon <br /> Sun Valley Express Truck Center■ Acampo, California <br /> August 14, 2017 ■ Terracon Project No. NA177026 <br /> After the 24-hour soak period, the deep boring P1 was found to be intact and dry on the day of <br /> testing. Water was observed in the shallow boring P2. <br /> 1.6.5 Percolation Test Procedure <br /> The percolation test was conducted on June 23, 2017 in accordance with the requirements of the <br /> San Joaquin County EHD. The shallow percolation test P2 had readings taken every 30 minutes <br /> for a duration of over 3 hours. The deep percolation test P1 had a duration of four hours with <br /> readings taken every 30 minutes and the final 30 minutes of the test was observed by an EHD <br /> representative which signed the percolation test form, (signature not legible). <br />• <br /> Measurement of the water level during the percolation tests was from a fixed reference point on <br /> the PVC casing using a calibrated Solinst electric water level detector with a depth accuracy of <br /> 0.01 feet. All tabulated values on the field data sheet are in decimal feet. A copy of the field data <br /> signed by the County Inspector is included in Appendix B. <br /> 1.6.6 Percolation Test Forms and Results <br /> The completed percolation test form with the EHD representative signature is included in <br /> Appendix B of this report. A shallow percolation test is defined by the EHD as being between 36 <br /> and 42 inches in depth. While a deep percolation test is defined by the EHD as being between <br /> 42 inches and 25 feet in depth. The percolation test must demonstrate a satisfactory percolation <br /> rate (less than or equal to 60 minutes per inch drop for shallow leach lines and 30 minutes per <br /> inch or less for septic pits per SJEHD) within the existing septic system disposal field of a parcel <br /> to utilize a standard septic system. Details of the percolation tests are summarized in the table <br /> below. <br /> Table 5. <br /> Summary of Percolation Tests. <br /> Test No. Percolation Percolation Comments <br />• Date Tested Test Rate Test Duration (see notes) <br /> Depth (feet) (minutes/inch) <br /> P1 (6-23-17) 25 14.7 240 minutes Satisfactory percolation <br /> rate <br /> P2 (6-23-17) 3.5 --- 195 minutes Unsatisfactory <br /> percolation rate <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,October 2003. <br /> 1.6.7 Discussion of Percolation Test Results <br /> • <br /> Responsive■ Resourceful ■ Reliable 10 <br />