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Soil Suitability/ Nitrate Loading Study r <br /> Ripon Winery Proposed Warehouse ■ Ripon, CA lrerracan <br /> January 20, 2017 ■ Terracon Project No. NA167059 <br /> The soil borings were excavated on January 11, 2017. Approximately two inches of"pea gravel' <br /> was placed in the bottom of the open boring. A 2.0-inch diameter PVC pipe with perforations <br /> towards the bottom was installed on top of the gravel and the annular space was backfilled with <br /> "pea gravel". Presaturation of the percolation test hole occurred approximately 24 hours prior to <br /> the day of testing on January 12, 2017. The depth of water used to pre-soak was three feet, the <br /> height of the boring. <br /> 1.6.4 Condition of Borings after Presaturation <br /> After the 24-hour soak period, the boring was found to be intact and dry on the day of testing. <br /> 1.6.5 Percolation Test Procedure <br /> The percolation test was conducted on January 12, 2017 in accordance with the requirements of <br /> the San Joaquin County EHD. The percolation test had a duration of one hour and was observed <br /> by Mr. Ted Tasiopoulos, Registered Environmental Health Specialist (REHS). <br /> Measurement of the water level during the percolation test 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 /> is included in Appendix B. <br /> 1.6.6 Percolation Test Forms and Results <br /> The completed percolation test form with Ted TasiopoulosoEHS verification signature is <br /> included in Appendix B of this report. A shallow percolation test is defined by the EHD as being <br /> between 36 and 42 inches in depth. While a deep percolation test is defined by the EHD as being <br /> between 42 inches and 25 feet in depth. T�_he percolation test must demonstrate a satisfactofy <br /> percolation rate (less than or equal to 60 minutes per inch drop) within the existing septic system <br /> disposal field of a parcel to utilize a standard septic system. Details of the percolation tests are <br /> summarized in the table below. <br /> Table 5. <br /> Summary of Percolation Tests. <br /> Percolation Percolation <br /> Test Test Rate Test Duration Comments <br /> Date Tested (see notes) <br /> Depth (inch) (minuteslinch) <br /> P1 (1-12-17) 36 4.2 60 minutes Satisfactory percolation <br /> rate <br /> P2 (1-12-17) 36 4.2 60 minutes Satisfactory percolation <br /> 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 /> Responsive■ Resourceful ■ Reliable 10 <br />