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01 October 2019 AdvancedGeo <br /> AGE Project No. 19-4850 Environmental <br /> Page 8 of 14 <br /> at the surface of the boring using a Solinst water level meter. Measurements were <br /> recorded at 30-minute intervals for four hours. The final two measurements were <br /> observed by the EHD inspector. Based on the field measurements collected, the <br /> percolation rate for the parcel was calculated; the Percolation Test Rate Field Sheet is <br /> provided in Appendix C. <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 C. <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 16.7 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 septic system should follow the San Joaquin <br /> County On-site Wastewater Disposal 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 the Jacktone-Urban land complex having 0 to 2 percent <br /> slopes (#181). The Jacktone-Urban land complex is composed of alluvium derived from <br /> mixed rock sources and is dominated by clay and sandy to clayey loam. Soils are <br /> described as somewhat poorly drained, with a low permeability and salinity of less than <br />