Laserfiche WebLink
12172 N Hibbard Road Project No. 2021-00063 P a g e | 11 <br />Table 6. <br />Soil Boring Log <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 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: