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23 October 2019 AdvancedGeo <br /> AGE Project No. 19-4881 E n vi ro n m e n t a I <br /> Page 9 of 15 <br /> sand. 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 D. <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 20.83 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 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 Manteca fine sandy loam having 0 to 2 percent slopes <br /> (#196). The Manteca fine sandy loam land complex is composed of alluvium derived from <br /> mixed rock sources and is dominated by sandy loam. Soils are described as moderately <br /> well drained; with a very low permeability; and salinity of less than 2.0 millimhos per <br />