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Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name Soil Perme- Septic tank and Map Depth Unified Soil Salinity Reaction ability absorption Symbol (m) Classification mmhos/cm pH (in/hr) fields Cosumnes 0-7 Silty clay loam; CL <2 6.1-7.8 0.2-0.6 Severe: silty clay 7-21 Silty clay loam, clay, CL, <2 6.1-7.8 0.06-0.2 peres slowly loam, CH drained, 0- 21-47 Clay loam, clay; CH, CL <2 6.6-8.4 0.06-0.2 2% slopes, 47-63 Clay loam, clay, CH, CL <2 7.4-8.4 0.06-0.2 138 Sailboat silt 0-8: Silt loam; CL-ML, ML <2 6.1-7.3 0.6-2.0 Severe: loam, 8-23: Stratified sandy loam to <2 6.6-7.8 0.2-0.6 peres slowly drained, 0- silty clay loam, CL-ML, 2% slopes, CL 234 23-61: Stratified sandy clay <2 7.4-8.4 0.2-0.6 loam to silty clay loam, CL 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 May 19, 2011, Live Oak excavated one shallow soil boring on the Site for the purpose of conducting a percolation test. The boring was four inches in diameter, 3.4 feet deep, and was excavated by hand auger. The boring location is indicated on Plate 2. The soil in the boring was less clayey than would be anticipated based on the Soil Survey data reviewed; sandy silt was observed to the full depth of the boring. The log for the soil boring is presented in Plate 9. Discussion of Soil Lithology Based on the soils observed in the boring, there appears to be moderate potential for percolation. 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. LOGE1120 Page 5