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27 August 2025 AdvancedGeo <br /> Project No. 25-8011 An Employee—Owned Company <br /> Page 8 of 14 Q,%a X <br /> Site soils demonstrated acceptable percolation rates, and no significant limitations or <br /> problems were identified for septic system installation at the approved location. <br /> 6.7. PERCOLATION TEST FINDINGS <br /> The shallow percolation test indicated a satisfactory percolation test rate. The percolation <br /> rate was calculated to be 2.13 minutes per inch based on the collected data. The use of <br /> the existing and proposed septic systems should follow the San Joaquin County On-site <br /> 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 the Honcut sandy loam (175). The Honcut sandy loam is <br /> described as having 0 to 2 percent slopes and is composed of alluvium derived from <br /> granitic rock sources. Soils are described as well drained, with very low runoff, high <br /> capacity to transmit water and salinity ranging from 0.0 to 2.0 millimhos per centimeter <br /> (mmhos/cm). The Honcut sandy loam typically features sandy loam from 0 to 60 inches <br /> bsg. <br /> 7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS <br /> The dominant soil type at the site indicates that the soils are semi-permeable and have <br /> moderate to high water storage. This soil will allow moderate infiltration of water through <br /> the surface soils. The longer the effluent remains near the surface, the more treatment is <br /> enhanced due to natural processes within the soil. If the permeable soils exist to the depth <br /> of the groundwater table, it is possible that surface contaminants may be transported <br /> rapidly. <br /> 8.0. IMPACT OF NITRATE TO GROUNDWATER <br /> Due to the planned recreational and residential use of the property and the potential for <br /> nitrate leaching into the groundwater from the proposed septic system, a nitrate loading <br /> analysis for the future use of the septic system is required by the EHD. <br />