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Soil Suitability/ Nitrate Loading Study <br /> Jeremy Winery Lodi, CA Irerracon <br /> May 7, 2019 - Terracon Project No. NA197008 <br /> level detector with a depth accuracy of 0.01 feet. All tabulated values on the field data sheet are <br /> in decimal feet. The percolation testfor borings B2 and B3 were observed by Mr. Naseem Ahmed, <br /> EHD representative. Copies of the field data is included in Appendix E. <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 drop in water level within the existing septic system disposal field <br /> of a parcel to utilize a standard septic system and 30 minutes per inch or less for septic pits. <br /> Details of the percolation tests are summarized in the table below. <br /> Table 7. <br /> Summary of Percolation Tests. <br /> Test No. Percolation Percolation Comments <br /> Test Rate Test Duration <br /> Date Tested Depth (feet) (minutes/inch) (see notes) <br /> B1 3.5 250 0.5 hours Unsatisfactory <br /> 03/22/2019 Percolation Rate <br /> B2 3.5 125 4 hours Unsatisfactory <br /> 03/22/2019 Percolation Rate <br /> B3 25.0 125 4 hours Unsatisfactory <br /> 04/05/2019 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 /> The completed percolation test form with Mr. Ahmed's verification signature is included in <br /> Appendix E of this report. <br /> 1.6.7 Discussion of Percolation Test Results <br /> Based on the percolation tests results, the two shallow borings at 3.5 feet bgs failed to achieve a <br /> passing percolation rate of 60 minutes per inch or less for standard leachfields. Additionally, the <br /> deep boring percolation test at 25 feet bgs failed to have a passing percolation rate of at least 30 <br /> minutes per inch for seepage pits. <br /> 1.6.8 Discussion of Septic System Sizing <br /> In general, septic system construction should follow the San Joaquin County On-Site Wastewater <br /> Disposal Standards (OWTS) where applicable As the shallow and deep percolation test borings <br /> exhibited a percolation rate greater than 120 minutes per inch, the EHD recommends an <br /> engineered septic system (OWTS, Table 1.10.2). <br /> Responsive ■ Resourceful ■ Reliable 12 <br />