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30 August 2019 <br />AGE Project No. 19-4819 <br />Page 9 of 15 <br /> <br />during the test are included on the Percolation Test Rate Field Sheet provided in <br />Appendix D. <br /> <br /> <br />6.6. POTENTIAL PROBLEMS PREDICTED <br /> <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 /> <br /> <br />6.7. PERCOLATION TEST FINDINGS <br /> <br />The shallow percolation test performed provided a satisfactory percolation test rate. The <br />percolation rate of 50 minutes per inch was calculated from data collected during the 4- <br />hour percolation test; the smallest reading over the 4-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 Disposal Standards. <br /> <br /> <br />7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL <br /> <br />Soil chemical properties were supplied by regionally sourced material for the surrounding <br />area. <br /> <br /> <br />7.1. CHEMICAL AND PHYSICAL PROPERTIES OF SITE SOILS <br /> <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 Capay Clay having 0 to 1 percent slopes (#118). The <br />Capay Clay land complex is composed of clayey alluvium derived from sedimentary rock <br />and is dominated by clay. Soils are described as moderately well drained; with a general <br />permeability of 0.06 to 0.20 inches per hour (in/hr); and salinity of less than 2.0 millimhos <br />per centimeter (mmhos/cm). Clays in the Capay Clay complex typically have the same <br />chemical properties between surface grade and 60 inches bsg. <br /> <br /> <br />7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS <br /> <br />The percolation test and dominant soil type at the site indicates that the soils are semi- <br />permeable and have moderate water storage. These soils will allow moderate infiltration <br />of water through the surface soils. The longer the effluent remains near the surface, the <br />more treatment is enhanced due to natural processes within the soil. If the permeable <br />soils exist to the depth of the groundwater table, it is possible that surface contaminants <br />may be transported fairly rapidly.