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Petralogix Engineering, <br />26675 Bruelia <br />(209)-400-5729 <br />www.petralogiiccom <br />1246 N Fine Road Project No. 2021-00025 Page I 11 <br />Table 6. <br />Soil Boring Logs <br />Depth Interval inches Soil Type Unified Soil Classification <br />11655 S Union Road <br />0-40 Brown, dry, fine <br />sandy loam SM <br />A visual inspection of the soil from on-site auguring indicates a moderate potential for percolation in <br />sandy loam. A percolation test is the best method to determine the suitability of the soils for a septic <br />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 April 20, 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 below. <br />Table 7. <br />Summary of Percolation Test — April 20, 2021 <br />0 <br />Test No., <br />Date Tested <br />Percolation <br />Test <br />Depth <br />(inches) <br />Percolation <br />Rate <br />(minutes/inch) <br />Test <br />Duration <br />Comments <br />(see notes) <br />1246 N Fine Road <br />P-1 (shallow) 40 11.36 4-hour Satisfactory <br />Note: A satisfactory percolation rate for a "shallow" test is less than or equal to 60 minutes per inch and greater than or equal to <br />1 minute per inch. <br />Inc. <br />Road, Galt, Ca 95632