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Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name and Map Symbol Depth (in) Unified Soil Classification Salinity mmhos/cm Soil Reaction pH Perme- ability (in/hr) Septic tank absorption fields Kingdon fine sandy loam, 0-2% slopes, 189 0-5 5-14 14-28 28-42 42-61 Fine sandy loam; SM Fine sandy loam; SM Sandy loam, fine sandy loam; SM Fine sandy loam, loam; SC-SM, CL-ML Fine sandy loam, sandy loam, coarse sandy loam; SM <2 <2 <2 <2 <2 5.6-7.3 6.1-7.3 6.1-7.3 6.1-7.8 6.6-8.4 2.0-6.0 2.0-6.0 2.0-6.0 0.6-2.0 2.0-6.0 Moderate: wetness, percs slowly Note: The table descriptions do not necessarily reflect site-specific soil properties. See description of the map unit for composition and behavior characteristics of the map unit. Soil Borings On June 16, 2021, Live Oak excavated a shallow soil boring near the proposed septic disposal area of the Site for the purpose of conducting a percolation test. The boring was four inches in diameter, 3.24 feet deep, and was excavated by hand auger (Table 2). The location of the boring is indicated on Plate 10. The soil in the boring was similar to that described by the Soil Survey. Sandy silt was encountered to the full depth of the hole. The soil log is presented on Plate 11. Discussion of Soil Lithology Based on the soil observed in the boring, there appears to be good potential for percolation in the shallow soil zone. Sandy soils generally have a much greater potential for percolation than fine-grained or cemented soils. However, a percolation test is the only accepted method for determining the suitability of the soils for a septic disposal area. Percolation test results are discussed in the following section. Percolation Test A shallow percolation test was conducted in the proposed septic disposal area of the Site. The soil boring discussed above was used for the percolation test hole. Percolation test procedures conformed to San Joaquin County Environmental Health Department policy. LOGE 2132 Page 5