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30 March 2021 AdvancedGeo <br /> Project No. 21-6352 Anfmployee-Owned Company <br /> Page 9 of 15 <br /> 6.5. COMPLETED PERCOLATION TEST FORM <br /> After completion of the test, the EHD inspector reviewed the field data and signed the <br /> required EHD Percolation Test Rate form. Field measurements recorded during the test <br /> are included on the Percolation Test Rate Field Sheet provided in Appendix D. <br /> 6.6. POTENTIAL PROBLEMS PREDICTED <br /> On site soils within the shallow percolation test hole demonstrated an adequate <br /> percolation rate. Additionally, the existing septic system has been operating properly. <br /> 6.7. PERCOLATION TEST FINDINGS <br /> The shallow percolation test performed provided a satisfactory percolation test rate. The <br /> percolation rate of 31.25 minutes per inch was calculated from data collected during the <br /> four-hour percolation test; the smallest reading over the four-hour period was used to <br /> calculate the percolation rate. The use of the existing and proposed septic systems should <br /> follow 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 Stockton clay having 0 to 2 percent slopes (#250). The <br /> Stockton clay is composed of alluvium derived from mixed rock sources. Soils are <br /> described as somewhat poorly drained, with a very low permeability, and salinity ranging <br /> from 0.0 to 2.0 millimhos per centimeter (mmhos/cm). The Stockton clay typically have <br /> similar chemical properties and soil profile 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 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 />