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10 June 2014 AGE Project No. 14-3035 Page 9 of 16 from a fixed reference point at the surface of the boring, using a Solinst water level meter. Measurements were taken at 30-minute intervals for over four 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 presented in the following forms. 6.6. 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 C. 6.7. 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. 6.8. PERCOLATION TEST FINDINGS The shallow percolation test performed provided a satisfactory percolation test rate. The percolation rate of 22 minutes per inch was calculated from data collected during the 4.5-hour percolation test. The use of the existing septic system should follow the San Joaquin County On-site Wastewater Disposal Standards. 7.0 CHEMICAL AND PHYSICAL PROPERTIES OF SOIL Soil chemical properties were supplied by regionally sourced material for the surrounding area. 7.1. 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 type for the subject property as Archerdale clay loam, 0 to 2 percent slopes (#107). The Archerdale soil has been denoted as very deep, well drained and nearly level soil. Permeability is slow in Archerdale soil. Archerdale soil typically has the same chemical properties between 0-60 inches bsg. The pH level ranges between 6.6 - 7.3 units with a salinity of less than 2.0. Advanced GeoEnviron mental,Inc.