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27 April 2020 AdvancedGeo <br /> Project No. 20-5084 An Employee Owned Company <br /> Page 9 of 15 <br /> 6.5. COMPLETED PERCOLATION TEST FORM <br /> After completion of the successful test, the EHD inspector reviewed the field data and <br /> signed the required EHD Percolation Test Rate form. Field measurements recorded <br /> during the test are included on the Percolation Test Rate Field Sheet provided in <br /> Appendix D. <br /> 6.6. POTENTIAL PROBLEMS PREDICTED <br /> On site soils within the shallow percolation test hole demonstrated adequate percolation <br /> rates. Additionally, the existing septic system has been properly operating. <br /> 6.7. PERCOLATION TEST FINDINGS <br /> The shallow percolation test performed provided a satisfactory percolation test rate. The <br /> percolation rate of 2.31 minutes per inch was calculated from data collected during the 1- <br /> hour percolation test; the smallest reading over the 1-hour period was used to calculate <br /> the percolation rate. The use of the existing and proposed septic systems should follow <br /> the San Joaquin County On-site Wastewater Treatment Standards. <br /> 7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> Soil chemical properties were supplied by regionally sourced material for the surrounding <br /> area. <br /> 7.1. CHEMICAL AND PHYSICAL PROPERTIES OF SITE SOILS <br /> The dominant soil composition in the general area of the property was inferred from <br /> information provided by the United States Department of Agriculture's Soil Geographic <br /> Database (USDASGD). The USDASGD soil survey indicates the soil type for the property <br /> is predominantly composed of Stomar clay loam having 0 to 2 percent slopes (#252). The <br /> Stomar clay loam land complex is composed of alluvium derived from sedimentary rock <br /> and is dominated by clay loam. Soils are described as well drained; with moderately low <br /> to moderately high permeability; and salinity of less than 2.0 millimhos per centimeter <br /> (mmhos/cm). Clays in the Stomar clay loam complex typically have the same chemical <br /> properties between surface grade and 60 inches bsg. <br /> 7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS <br /> The percolation test and dominant soil type at the site indicates that the soils are <br /> permeable and have low water storage. These soils will allow moderate infiltration of <br />