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12430 E.ATKINSON ROAD Project No.2017-00002 Page 18 1 Depth Interval(ft) Soil Type Unified Soil Classification 18-20 Light brown,dry,clay with CL ' sand 20-25 Brown,dry,clay CL A visual inspection of the soils from on-site drilling indicates a low to moderate potential for percolation in sandy loam and clay layers, and a low potential for percolation in the clay layers observed at the 12401 E.Atkinson and 12420 and 12430 E.Atkinson,respectively. 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. 6.0 PERCOLATION TEST INFORMATION , A site map indicating the location of the percolation test hole locations for each address is included as Plate 2 in Appendix A of this report. ' At 12401 E. Atkinson road, one shallow, and two deep, percolation tests were conducted approximately 24 feet northeast of the northeast corner of the garage,and 88 feet east of the western ' property fence boundary. At 12420 E.Atkinson road, one shallow,and two deep, percolation tests were conducted south of the residence, approximately 64 feet north of the southern property boundary fence and 118 feet east of the western property fence boundary.At 12430 E.Atkinson road, ' one shallow, and two deep, percolation tests were conducted approximately 78 feet south of the southwest corner of the detached garage, approximately 52 feet north of the southern property boundary fence.For each parcel,the shallow soil boring was advanced on the property with a hand auger; the two deep soil borings were advanced on the property with a drill rig auger on July 11, 2017. A 2.0-inch diameter PVC pipe with perforations on the bottom was used to measure the drop of water in each of the percolation test borings. Approximately two (2) inches of"pea gravel' was ' placed in the bottom of each of the open soil borings and then the PVC pipe was installed on top of the gravel. "Pea gravel' was then used to backfill in the annular space. Presaturation of the percolation test holes 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 presaturated holes were found to be intact and dry on the day of testing, with the exception of the 6.37-Foot deep test hole located at 12401 E. Atkinson, the 19.96 and 24.60 feet deep test holes located at 12420 E.Atkinson, and the 24.57 feet deep test hole located at 12430 E.Atkinson road.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 Steven Shih on July 12, 2017 at the time of the percolation test inspection. 6.1 Percolation Test Procedure ' Percolation tests were conducted for the borings on July 12, 2017 in accordance with the requirements of the EHD. A four-hour percolation test was performed for each test. The last half hour of the test was observed by Steven Shih, Lead Senior Registered Environmental Health Pe JoglxEn�M2.t,EHD. 366758r 11a Hoed,Galt,Ca 95632 ' [209}400-5729 v .Wraloglxc