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Soil Suitability Study Irerracon <br /> Flag City#4 Lodi, California <br /> February 14, 2019 Terracon Project No. NA187043 <br /> 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 4. <br /> Summary of Percolation Test. <br /> Percolation Percolation <br /> Test No. Comments <br /> Date Tested Test Rate Test Duration (see notes) <br /> Depth (inch) (minutes/inch) <br /> B1 42 14.7 4 hours Satisfactory Percolation <br /> 01/29/2019 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 /> 6.7 Discussion of Percolation Test Results <br /> The slightly cemented sandy soils encountered in the shallow boring (3.5 feet bgs) demonstrated <br /> a satisfactory percolation rate for a shallow leach field. <br /> 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 where applicable. Given the deeper clayey sand layers with potential <br /> hardpan layers encountered, filter beds, sumps, or seepage pits may be required at the end of <br /> the leach lines as a secondary absorption measure. <br /> 7.0 CONCLUSIONS AND RECOMMENDATIONS <br /> In summary, the soil conditions at the site are anticipated to consist of well drained sandy loam <br /> underlain by a very low permeable hardpan. Depth to groundwater is anticipated between 14 and <br /> 40 feet bgs. Groundwater samples collected from the onsite well reported below laboratory <br /> detection limits for nitrate as N and DBCP. A satisfactory percolation rate was achieved in the <br /> shallow boring B1 at 3.5 feet bgs. <br /> Responsive■ Resourceful ■ Reliable 11 <br />