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Percolation Test Irerracon <br /> Paradiso Property Stockton, California <br /> October 8, 2020 Terracon Project No. NA207072 <br /> Test No. Percolation Test Percolation Rate Test Duration Comments <br /> Date Tested Depth (feet) (min/in) (hours) <br /> B2 Satisfactory <br /> 13.0 17.86 4 <br /> 10-29-20 Percolation Rate <br /> B3 25.0 250 4 Unsatisfactory <br /> 10-29-20 Percolation Rate <br /> Regarding boring B2 Terracon disregarded the first two readings and used the lowest water drop <br /> of the trend to calculate the percolation rate. A satisfactory percolation rate is 60 minutes per inch <br /> or less for shallow leach lines and 30 minutes per inch or less for septic pits per San Joaquin <br /> County Onsite Wastewater Treatment Systems Standards(OWTS) (EHD 42-014), January 2017. <br /> EHD PERMIT DISCUSSION <br /> Terracon reviewed the EHD well and septic permits for the parent parcel address (1352 Baldwin <br /> Late). Based on a review Permit No. 84-383 the parent parcel was developed with a former onsite <br /> septic system consisting of a 40 foot long leach line with one 2.75 foot wide by 25 foot deep <br /> seepage pit. The septic system appears to have been abandoned in 2005 as per Permit No. <br /> SR0042950. According to the EHD color coded county map and Standard OWTS Design <br /> Requirements (Table 9.7.1), the site is located within a clay area where leach lines and seepage <br /> pits are permitted. <br /> CONCLUSIONS AND RECOMMENDATION <br /> Based on the results of the field work, site soils consisted primarily of lean clays. A silty sand soil <br /> lense was encountered between approximately 12 and 15.5 feet bgs. Based on the percolation <br /> test results, soil boring B2 at 13 feet bgs has demonstrated a satisfactory percolation rate of 17.86 <br /> minutes/inch in accordance with San Joaquin County requirements for the use of a standard <br /> septic system with seepage pits. The septic system design should accommodate peak flows and <br /> follow the San Joaquin County OWTS standards where applicable. <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 /> Responsive ■ Resourceful ■ Reliable 4 <br />