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12172 N Hibbard Road Project No.2021-00063 Page 111 <br /> Table 6. <br /> Soil Boring Lo <br /> Depth Interval (inches) Soil Type Unified Soil Classification <br /> 12172 Hibbard Road <br /> 0-32 Black,dry,clay CL <br /> 32-40 Cemented -- <br /> 40-41 =F— Red sandy clay CL <br /> A visual inspection of the soil from on-site auguring indicates a low potential for percolation in clay <br /> and sandy clay. A percolation test is the best method to determine the suitability of the soils for a <br /> septic disposal area. Please see the next section for percolation test results. Generally speaking, <br /> coarser-grained soils have much greater potential for percolation than fine-grained or cemented <br /> soils. <br /> 8.2 Percolation Test Procedure <br /> One percolation test was conducted for the boring on June 25, 2021, in accordance with the <br /> requirements of the EHD. A four-hour percolation test was performed for the test. The last half hour <br /> of the test was observed by a representative Environmental Health Specialist, EHD. <br /> Measurement of the water level during the percolation test was from a fixed reference point on the <br /> PVC casing using an electric well sounder with a depth accuracy of 1/100th foot. All tabulated values <br /> on the field data sheet are in decimal feet. After water drop was observed,the hole was checked for <br /> refill. The refill level was approximately 0.5 ft (6 inches) of water above the bottom level of the <br /> percolation test hole. The readings were taken every 30 minutes for a period of four(4) hours. <br /> 8.3 Percolation Test Form and Results <br /> The completed percolation test permit and test form are included in the Appendix E of this report. <br /> A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth; a <br /> satisfactory percolation rate for a shallow test is less than or equal to 60 minutes per inch drop.The <br /> percolation test must demonstrate a satisfactory percolation rate within the proposed septic system <br /> disposal field of each parcel to utilize a standard septic system. Details of the percolation test is <br /> summarized in the Table 7: <br /> Petralogix Engineering,InC. <br /> 26675 BruelIa Road,Galt,Ca 95632 <br /> [209j-40o-5729 <br /> www.petralogix.com <br />