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21 June 2019 AdvancedGeo <br /> AGE Project No. 19-4745 Environmental <br /> Page 8 of 14 <br /> by recording the amount of water remaining in the borehole at 30-minute intervals for a <br /> period of four hours. Additional water was added to the boring after each 30-minute <br /> interval as required to ensure that approximately 6-inches of water remained above the <br /> gravel. The water level was measured from a fixed reference point at the surface of the <br /> boring using a Solinst water level meter. Measurements were recorded at 30-minute <br /> intervals for four hours. The final two measurements were observed by the EHD <br /> inspector. Based on the field measurements collected, the percolation rate for the parcel <br /> was calculated; the Percolation Test Rate Field Sheet is provided in Appendix C. <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 C. <br /> 6.6. POTENTIAL PROBLEMS PREDICTED <br /> On site soils within the shallow percolation test range demonstrated adequate percolation <br /> rates. Additionally, the existing septic system had been properly operating. <br /> 6.7. PERCOLATION TEST FINDINGS „o p <br /> The shallow percolation test performed provided a satisfactory percolation test rate. The <br /> percolation rate of 14.70 minutes per inch was calculated from data collected during the <br /> 4-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 />