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476 N Patton Avenue Project No. 2021-00084 P a g e 11 <br /> 8.0 PERCOLATION TEST INFORMATION <br /> A site map indicating the location of the percolation test hole location for the parcel is <br /> included as Plate 2 in Appendix A of this report. <br /> At 476 N Patton Avenue, one shallow percolation test was placed approximately 268 feet <br /> west of the eastern parcel boundary and approximately 47 feet northwest of the southern <br /> parcel boundary, within the anticipated leach field area. The shallow soil boring was <br /> advanced on the property with a 4-inch hand auger. Approximately two (2) inches of "pea <br /> gravel" was placed in the bottom of the open soil boring after the sides were scratched to <br /> remove any smeared surfaces, and then the perforated PVC pipe was installed on top of the <br /> gravel. "Pea gravel" was then used to backfill in the annular space. The test hole was pre- <br /> saturated with 12 inches of water approximately 24 hours prior to the day of testing. After <br /> the 24-hour soak period, the pre-saturated hole was found to be intact and dry on the day of <br /> testing. The final percolation rates were determined based on the EHD Percolation Test <br /> Procedure form 42-01-002, revised 8-23-2011, based on if water or no water remains in the <br /> test hole overnight, and supervised under a San Joaquin County Registered Environmental <br /> Health Specialist on September 29, 2021, at the time of the percolation test inspection. <br /> 8.1 Soil Boring Log <br /> One four-inch diameter shallow soil boring was advanced on the site down to forty-two (42) <br /> inches. The soil boring location was recorded using handheld sub meter Trimble GeoXH GPS <br /> device (37.974649° N, -121.168627° W). The location of the test boring is indicated in <br /> Appendix A, Plate 2. Generally, the soil encountered in the boring was similar to the soils <br /> reported by the San Joaquin County Soil Survey for the area (USDA, 1992). The Table 6 <br /> presents the soil log for the percolation test location. <br /> Table 6. <br /> Soil Boring Lo <br /> Depth Interval (inches) IF Soil Type Unified Soil Classification <br /> 476 N Patton Avenue <br /> 0-36 Black,dry,clay CH <br /> 36-42 �F Reddish brown, dry,clay loam CL <br /> A visual inspection of the soil from on-site auguring indicates a low potential for percolation <br /> in the black clay layer (0-36 inches) and moderate potential for percolation in the clay loam <br /> layer (36-42 inches).A percolation test is the best method to determine the suitability of the <br /> soils for a septic disposal area. Please see the next section for percolation test results. <br /> Generally speaking, coarser-grained soils have much greater potential for percolation than <br /> fine-grained or cemented soils. <br /> Petralogix Engineering,Inc. - <br /> 26675 BruelIa Road,Galt,Ca 95632 <br /> (209)-40o-5729 <br /> www.petralogix.com <br />