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01 July 2016 AGE Project No. 15-3403 Page 10 of 12 less than 30-minutes. After recording the measurement the EHD inspector approved a one-hour percolation test. Additional water was added to the boring as required to ensure that approximately 6-inches of water remained. The water level was measured from a fixed reference point at the surface of the boring, using a Solinst water level meter. Measurements were taken at 10 or 15-minute intervals for over two hours. The final three measurements were observed by the EHD inspector. Based on the field measurements collected, the percolation rate for the parcel was calculated and is presented in the 8.6. COMPLETED PERCOLATION TEST FORM After completion of the test, the EHD inspector reviewed the field data and signed the required EHD Percolation Test Rate form. Field measurements recorded during the test are included on the Percolation Test Rate Field Sheet provided in Appendix D. 8.7. POTENTIAL PROBLEMS PREDICTED On site soils within the shallow percolation test range demonstrated adequate percolation rates. Additionally, the existing septic system has been properly operating. 8.8. PERCOLATION TEST FINDINGS The shallow percolation test performed provided a satisfactory or overly satisfactory (aggressive or fast) percolation test rate. The percolation rate of 1 .67 minutes per inch was calculated from data collected during the 2-hour percolation test. However, the hole did maintain water during the later portion of the test. The use of the existing septic system should follow the San Joaquin County On-site Wastewater Disposal Standards. Additional septic leach line drainage will require additional organic media or straw to reduce the infiltration rate or installation of the leach lines at depths less than three feet bsg; thus not exposing leach lines to coarse grained soils (sand) directly. 9.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL Soil chemical properties were supplied by regionally sourced material for the surrounding area. 9.1. CHEMICAL AND PHYSICAL PROPERTIES OF SITE SOILS The local soil describes the dominant soil composition in the general area of the subject property based on information from the U. S. Department of Agriculture's Soil Conservation Service State Soil Geographic Database soil maps. The United States Department of Agriculture Soil Survey of San Joaquin County, California indicates the soil Advanced GeoEnvironmental,Inc.