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Soil Suitability Evaluation Page 6 of 18 <br />Austin Road Mini Storage <br />183 South Austin Road, Manteca, California <br />December 13, 2021 NATS Job # 22-282G <br />of the 2 inches of gravel placed at the base of the test hole. Recordings were made of <br />the change (drop) in water level at regular time intervals and water level was refilled to <br />6.0 inches after each recording. Specific details are included on the attached <br />"Percolation Test Data Sheets" located in Appendix -B. The last several intervals of <br />testing were observed and certified by a San Joaquin County Environmental Health <br />Department Inspector; the certified percolation test rate sheets are included in <br />Appendix C. <br />7.2 Percolation and Infiltration Rates <br />The soil percolation rate is defined by the average time in minutes for a 1 -inch column <br />of water to "seep" into the soil. Percolation rate was calculated in minutes per inch <br />(MPI) by dividing the time (in minutes) by the change (drop) in water level (in inches) for <br />the last test interval (last reading). No correction factor was used in the calculation for <br />the 6 -inch test hole diameter. <br />Percolation test "P-1" achieved a steady percolation rate of 13.3 MPI at 36 -inches bgs. <br />In general, the percolation rates are considered representative of soil types <br />encountered at the site/vicinity. Infiltration rates were calculated using the percolation <br />data at the last test interval using the "Porchet" method and converted to gallons/cubic- <br />foot/day. Based on these calculations the infiltration rate for P-1 is 14.17 gal/cf/day. <br />Infiltration rate calculations are included in Appendix B. <br />4713 ENTERPRISE WAY * SUITE 4 * MODESTO * CALIFORNIA * 95356 * 209-545-1108 <br />