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33503 S Koster Road Project No.2021-00073 Page 111 <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 7, 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° 38.874'N, -121° 19.526'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) Soil Type Unified Soil Classification <br /> 33503 S Koster Road <br /> 0-42 =F <br /> Reddish brown, dry,clay loam CL <br /> A visual inspection of the soil from on-site auguring indicates a moderate potential for <br /> percolation in clay loam.A percolation test is the best method to determine the suitability of <br /> the 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 /> 8.2 Percolation Test Procedure <br /> One percolation test was conducted for the boring on September 7, 2021,in accordance with <br /> the requirements of the EHD. A four-hour percolation test was performed for the test. The <br /> last half hour of the test was observed by Ms. Aldara Salinas, an Environmental Health <br /> Specialist for San Joaquin County EHD. <br /> Measurement of the water level during the percolation test was from a fixed reference point <br /> on the PVC casing using an electric well sounder with a depth accuracy of 1/100th foot. All <br /> tabulated values on the field data sheet are in decimal feet. After water drop was observed, <br /> the hole was checked for refill. The refill level was approximately 0.5 ft (6 inches) of water <br /> above the bottom level of the percolation test hole. The readings were taken every 30 <br /> minutes for a period of four (4) hours. <br /> Petralogix Engineering,InC. - <br /> 26675 BruelIa Road,Galt,Ca 95632 <br /> (209)-40o-5729 <br /> www.petralogix.com <br />