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Percolation Test Irerracon <br /> Williams Property Acampo, California <br /> June 25, 2020 Terracon Project No. NA197051 <br /> June 5, 2020, all borings were found to be dry and intact on the day of the percolation test. <br /> Approximately 0.5 feet of water was added over gravel and the drop in water level was recorded <br /> every 30 minutes over a four hour period. The final 30 minutes of the test was observed by EHD <br /> representative Ms. Daria Afonskaia who signed the percolation test form. <br /> Table 2 <br /> Summary of Percolation Test <br /> Test No. Percolation Test Percolation Rate Test Duration Comments <br /> Date Tested Depth (feet) (min/in) (hours) <br /> B1 <br /> 3.5 0 4 Unsatisfactory <br /> 06-05-2020 Percolation Rate <br /> B2 25.0 0 4 Unsatisfactory <br /> 06-05-2020 Percolation Rate <br /> B3 22.0 7.14 4 Satisfactory <br /> 06-05-2020 Percolation Rate <br /> A satisfactory percolation rate is 60 minutes per inch or less for shallow leach lines and 30 minutes <br /> per inch or less for septic pits per San Joaquin County Onsite Wastewater Treatment Systems <br /> Standards (EHD 42-014), January 2017. <br /> CONCLUSIONS AND RECOMMENDATION <br /> Based on the results of the field work, site soils consist primarily of sandy silt to silty sand to 25 <br /> feet bgs. Based on percolation test results, soil boring B3 at 22 feet bgs has demonstrated a <br /> satisfactory percolation rate of 7.14 minutes/inch in accordance with San Joaquin County <br /> requirements for the use of a standard septic system. <br /> LIMITATIONS <br /> The conclusions of this report are based on the information provided regarding the existing and <br /> proposed development, the use of the subject property, and the site conditions as they existed at <br /> the time we excavated our soil borings and performed the percolation test. it was assumed that <br /> the soil borings and percolation test results are representative of the subsurface conditions in the <br /> general area. <br /> Our professional services were performed, our findings obtained, and our conclusions proposed <br /> in accordance with generally accepted engineering principles and practices. This warranty is in <br /> lieu of all other warranties either expressed or implied. Test findings and statements of <br /> professional opinion do not constitute a guarantee or warranty, expressed or implied. <br /> Responsive ■ Resourceful ■ Reliable 3 <br />