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21300 MANN ROAD Project No.2019-00095 Page 110 8.0 PERCOLATION TEST INFORMATION A site map indicating the location of the percolation test hole location for the parcel is included as Plate 2 in Appendix A of this report. At 21300 Mann Road, one shallow percolation test was placed approximately 80 feet south of the northern parcel boundary, approximately 80 feet east of the western parcel boundary along Mann Road,and approximately 60 feet north of the southern parcel boundary. The shallow soil boring was advanced on the property with a hand auger.A 2.0-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of water in the percolation test boring. Approximately two (2) inches of"pea gravel"was placed in the bottom of each of the open soil boring and then the PVC pipe was installed on top of the gravel. "Pea gravel" was then used to backfill in the annular space. Pre- saturation of the percolation test hole occurred approximately 24 hours prior to the day of testing. The depth of water used to pre-soak the shallow test holes was 12 inches above the bottom of each shallow boring.The depth of water used to pre-soak the deep test holes was approximately 6 inches above the selected stratum. After the 24-hour soak period, the pre-saturated hole was found to be intact and dry on the day of testing. The final percolation rates were determined based on the EHD Percolation Test Procedure form 42-01-002,revised 8-23-2011,based on if water or no water remains in the test hole overnight,and supervised under Daria Afonskaia on November 5,2019 at the time of the percolation test inspection. 8.1 Soil Boring Logs One four-inch diameter shallow soil boring was advanced on the site down to forty-one (41) inches. The soil boring location was recorded using handheld sub meter Trimble GeoXH GPS device (37°10'40.21", -121°12'52.96"). The location of the test boring is indicated in Appendix A, Plate 2. Generally, the soil encountered in the boring was similar to the soils reported by the San Joaquin County Soil Survey for the area (USDA, 1992). The table below presents the soil log for the percolation test location. Table 5. Soil Boring Logs Depth Interval(inches) Soil Type 17)Unified Soil Classification 16475 Tide Road 0-41 Brown,dry,fine SM sandy loam A visual inspection of the soil from on-site auguring indicates a moderate potential for percolation in sandy loam.A percolation test is the best method to determine the suitability of the soils for a septic disposal area. Please see the next section for percolation test results. Generally speaking, coarser-grained soils have much greater potential for percolation than fine-grained or cemented soils. Petralogix Engineering,Inc. 26675 Bruella Road,Galt,Ca 95632 (209)-000-5729 4W www.petralogix.com