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n n Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank and Map (in) Classification mmhoslcm Reaction ability absorption Symbol pH (in/hr) fields San 0-16 Loam; CL-ML, ML <2 5.6-6.5 0.6-2.0 Severe: Joaquin cemented loam, 2-8 % 16-26 Clay loam, clay; CL <2 6.1-7.8 <0.06 pan, peres slopes, slowly eroded 26-60 Indurated --- --- --- 239 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 March 17, 2010, Live Oak excavated one shallow soil boring on the Site for the `J, purpose of conducting a percolation test. The boring was four inches in diameter, 3.0 feet deep, and was excavated by hand auger. The boring location is indicated on Plate 2. The soil in the borings was within the range of what would be anticipated based on the Soil Survey data reviewed; a hardpan layer was observed from 2.8 to 3.0 feet below ground surface. 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. Percolation Test One shallow percolation test was conducted on the Site; the shallow soil boring discussed above was used for the percolation test hole (Plate 2). Percolation test procedures conformed to San .Joaquin County Environmental Health Department policy. LOGE1005 Page 5